Lake-effect snow is produced during cooler atmospheric conditions when a cold

air mass In meteorology, an air mass is a volume of air defined by its temperature and humidity. Air masses cover many hundreds or thousands of square miles, and adapt to the characteristics of the surface below them. They are classified according to ...

moves across long expanses of warmer

lake A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much lar ...

water. The lower layer of air, heated up by the lake water, picks up

water vapor (99.9839 °C) , - , Boiling point , , - , specific gas constant , 461.5 J/( kg·K) , - , Heat of vaporization , 2.27 MJ/kg , - , Heat capacity , 1.864 kJ/(kg·K) Water vapor, water vapour or aqueous vapor is the gaseous p ...

from the lake and rises up through the colder air above. The vapor then freezes and is deposited on the

leeward Windward () and leeward () are terms used to describe the direction of the wind. Windward is ''upwind'' from the point of reference, i.e. towards the direction from which the wind is coming; leeward is ''downwind'' from the point of reference ...

(downwind) shores. The same effect also occurs over bodies of

saline water Saline water (more commonly known as salt water) is water that contains a high concentration of dissolved salts (mainly sodium chloride). On the United States Geological Survey (USGS) salinity scale, saline water is saltier than brackish water, ...

, when it is termed ocean-effect or bay-effect snow. The effect is enhanced when the moving air mass is uplifted by the

orographic Orography is the study of the topographic relief of mountains, and can more broadly include hills, and any part of a region's elevated terrain. Orography (also known as ''oreography'', ''orology'' or ''oreology'') falls within the broader discip ...

influence of higher elevations on the downwind shores. This uplifting can produce narrow but very intense bands of

precipitation In meteorology, precipitation is any product of the condensation of atmospheric water vapor that falls under gravitational pull from clouds. The main forms of precipitation include drizzle, rain, sleet, snow, ice pellets, graupel and hai ...

, which deposit at a rate of many inches of snow each hour, often resulting in a large amount of total

snowfall Snow comprises individual ice crystals that grow while suspended in the atmosphere—usually within clouds—and then fall, accumulating on the ground where they undergo further changes. It consists of frozen crystalline water throughout ...

. The areas affected by lake-effect snow are called

snowbelt The Snowbelt is the region near the Great Lakes in North America where heavy snowfall in the form of lake-effect snow is particularly common. Snowbelts are typically found downwind of the lakes, principally off the eastern and southern shores. C ...

s. These include areas east of the

Great Lakes The Great Lakes, also called the Great Lakes of North America, are a series of large interconnected freshwater lakes in the mid-east region of North America that connect to the Atlantic Ocean via the Saint Lawrence River. There are five la ...

in North America, the west coasts of northern Japan, the

Kamchatka Peninsula The Kamchatka Peninsula (russian: полуостров Камчатка, Poluostrov Kamchatka, ) is a peninsula in the Russian Far East, with an area of about . The Pacific Ocean and the Sea of Okhotsk make up the peninsula's eastern and we ...

in Russia, and areas near the Great Salt Lake,

Black Sea The Black Sea is a marginal mediterranean sea of the Atlantic Ocean lying between Europe and Asia, east of the Balkans, south of the East European Plain, west of the Caucasus, and north of Anatolia. It is bounded by Bulgaria, Georgia, ...

Caspian Sea The Caspian Sea is the world's largest inland body of water, often described as the List of lakes by area, world's largest lake or a full-fledged sea. An endorheic basin, it lies between Europe and Asia; east of the Caucasus, west of the broad s ...

Baltic Sea The Baltic Sea is an arm of the Atlantic Ocean that is enclosed by Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Poland, Russia, Sweden and the North and Central European Plain. The sea stretches from 53°N to 66°N latitude and fr ...

Adriatic Sea The Adriatic Sea () is a body of water separating the Italian Peninsula from the Balkans, Balkan Peninsula. The Adriatic is the northernmost arm of the Mediterranean Sea, extending from the Strait of Otranto (where it connects to the Ionian Sea) ...

, and

North Sea The North Sea lies between Great Britain, Norway, Denmark, Germany, the Netherlands and Belgium. An epeiric sea on the European continental shelf, it connects to the Atlantic Ocean through the English Channel in the south and the Norwegian S ...

. Lake-effect blizzards are the

blizzard A blizzard is a severe snowstorm characterized by strong sustained winds and low visibility, lasting for a prolonged period of time—typically at least three or four hours. A ground blizzard is a weather condition where snow is not falling ...

-like conditions resulting from lake-effect snow. Under certain conditions, strong winds can accompany lake-effect snows creating blizzard-like conditions; however, the duration of the event is often slightly less than that required for a blizzard warning in both the US and Canada. If the air temperature is low enough to keep the precipitation frozen, it falls as lake-effect snow. If not, then it falls as lake-effect rain. For lake-effect rain or snow to form, the air moving across the lake must be significantly cooler than the surface air (which is likely to be near the temperature of the water surface). Specifically, the air temperature at an altitude where the

air pressure Atmospheric pressure, also known as barometric pressure (after the barometer), is the pressure within the atmosphere of Earth. The standard atmosphere (symbol: atm) is a unit of pressure defined as , which is equivalent to 1013.25 millibars, ...

is (roughly vertically) should be lower than the temperature of the air at the surface. Lake-effect occurring when the air at is much colder than the water surface can produce

thundersnow Thundersnow, also known as a winter thunderstorm or a thundersnowstorm, is a kind of thunderstorm with snow falling as the primary precipitation instead of rain. It is considered a rare and unusual phenomenon. It typically falls in regions of s ...

, snow showers accompanied by

lightning Lightning is a naturally occurring electrostatic discharge during which two electrically charged regions, both in the atmosphere or with one on the ground, temporarily neutralize themselves, causing the instantaneous release of an average ...

and

thunder Thunder is the sound caused by lightning. Depending upon the distance from and nature of the lightning, it can range from a long, low rumble to a sudden, loud crack. The sudden increase in temperature and hence pressure caused by the lightning pr ...

(caused by larger amounts of energy available from the increased instability).

Formation

Some key elements are required to form lake-effect precipitation and which determine its characteristics: instability, fetch, wind shear, upstream moisture, upwind lakes, synoptic (large)-scale forcing, orography/topography, and snow or ice cover.

Instability

A temperature difference of (or as past researchers have estimated: between 15 and 25 °C) between the lake temperature and the height in the atmosphere (about at which barometric pressure measures ) provides for absolute instability and allows vigorous heat and moisture transportation vertically. Atmospheric

lapse rate The lapse rate is the rate at which an atmospheric variable, normally temperature in Earth's atmosphere, falls with altitude. ''Lapse rate'' arises from the word ''lapse'', in the sense of a gradual fall. In dry air, the adiabatic lapse rate is ...

and convective depth are directly affected by both the mesoscale lake environment and the synoptic environment; a deeper convective depth with increasingly steep lapse rates and a suitable moisture level allow for thicker, taller lake-effect precipitation clouds and naturally a much greater precipitation rate.

Fetch

The distance that an air mass travels over a body of water is called fetch. Because most lakes are irregular in shape, different angular degrees of travel yield different distances; typically, a fetch of at least is required to produce lake-effect precipitation. Generally, the larger the fetch, the more precipitation produced. Larger fetches provide the boundary layer with more time to become saturated with water vapor and for heat energy to move from the water to the air. As the air mass reaches the other side of the lake, the engine of rising and cooling water vapor pans itself out in the form of condensation and falls as snow, usually within of the lake, but sometimes up to about . Lake effect snow wind direction bands1

Wind shear

Directional

shear Shear may refer to: Textile production *Animal shearing, the collection of wool from various species **Sheep shearing *The removal of nap during wool cloth production Science and technology Engineering *Shear strength (soil), the shear strength ...

is one of the most important factors governing the development of squalls; environments with weak directional shear typically produce more intense squalls than those with higher shear levels. If directional shear between the surface and the height in the atmosphere at which the barometric pressure measures is greater than 60°, nothing more than flurries can be expected. If the directional shear between the body of water and the vertical height at which the pressure measures is between 30° and 60°, weak lake-effect bands are possible. In environments where the shear is less than 30°, strong, well organized bands can be expected. Speed shear is less critical but should be relatively uniform. The wind-speed difference between the surface and vertical height at which the pressure reads should be no greater than so as to prevent the upper portions of the band from shearing off. However, assuming the surface to winds are uniform, a faster overall velocity works to transport moisture more quickly from the water, and the band then travels much farther inland. Lake effect deltat chart

Upstream moisture

A lower upstream relative humidity lake effect makes condensation, clouds, and precipitation more difficult to form. The opposite is true if the upstream moisture has a high relative humidity, allowing lake-effect condensation, cloud, and precipitation to form more readily and in a greater quantity.

Upwind lakes

Any large body of water upwind impacts lake-effect precipitation to the lee of a downwind lake by adding moisture or pre-existing lake-effect bands, which can reintensify over the downwind lake. Upwind lakes do not always lead to an increase of precipitation downwind.

Synoptic forcing

Vorticity advection aloft and large upscale ascent help increase mixing and the convective depth, while cold air advection lowers the temperature and increases instability.

Orography and topography

Typically, lake-effect precipitation increases with elevation to the lee of the lake as topographic forcing squeezes out precipitation and dries out the squall much faster.

Snow and ice cover

As a lake gradually freezes over, its ability to produce lake-effect precipitation decreases for two reasons. Firstly, the open ice-free liquid surface area of the lake shrinks. This reduces fetch distances. Secondly, the water temperature nears freezing, reducing overall latent heat energy available to produce squalls. To end the production of lake-effect precipitation, a complete freeze is often not necessary. Even when precipitation is not produced, cold air passing over warmer water may produce cloud cover. Fast-moving mid-latitude cyclones, known as

Alberta clipper An Alberta clipper, also known as an Alberta low, Alberta cyclone, Alberta lee cyclone, Canadian clipper, or simply clipper, is a fast-moving low-pressure system that originates in or near the Canadian province of Alberta just east of the Rock ...

s, often cross the Great Lakes. After the passage of a cold front, winds tend to switch to the northwest, and a frequent pattern is for a long-lasting

low-pressure area In meteorology, a low-pressure area, low area or low is a region where the atmospheric pressure is lower than that of surrounding locations. Low-pressure areas are commonly associated with inclement weather (such as cloudy, windy, with possibl ...

to form over the

Canadian Maritimes The Maritimes, also called the Maritime provinces, is a region of Eastern Canada consisting of three provinces: New Brunswick, Nova Scotia, and Prince Edward Island. The Maritimes had a population of 1,899,324 in 2021, which makes up 5.1% ...

, which may pull cold northwestern air across the Great Lakes for a week or more, commonly identified with the negative phase of the North Atlantic Oscillation (NAO). Since the prevailing winter winds tend to be colder than the water for much of the winter, the southeastern shores of the lakes are almost constantly overcast, leading to the use of the term "the Great Gray Funk" as a synonym for winter. These areas allegedly contain populations that suffer from high rates of

seasonal affective disorder Seasonal affective disorder (SAD) is a mood disorder subset, in which people who have normal mental health throughout most of the year exhibit depressive symptoms at the same time each year. Common symptoms include sleeping too much, having l ...

, a type of psychological depression thought to be caused by lack of light.

Great Lakes region

United States

Cold winds in the winter typically prevail from the northwest in the Great Lakes region, producing the most dramatic lake-effect snowfalls on the southern and eastern shores of the

. This lake effect results in much greater snowfall amounts on the southern and eastern shores compared to the northern and western shores of the Great Lakes. The most affected areas include the

Upper Peninsula of Michigan The Upper Peninsula of Michigan – also known as Upper Michigan or colloquially the U.P. – is the northern and more elevated of the two major landmasses that make up the U.S. state of Michigan; it is separated from the Lower Peninsula by ...

;

Central New York Central New York is the central region of New York State, including the following counties and cities: With a population of about 773,606 (2009) and an area of , the region includes the Syracuse metropolitan area. Definitions The New Yor ...

;

Western New York Western New York (WNY) is the westernmost region of the U.S. state of New York. The eastern boundary of the region is not consistently defined by state agencies or those who call themselves "Western New Yorkers". Almost all sources agree WNY in ...

;

Northwestern Pennsylvania Western Pennsylvania is a region in the U.S. state of Pennsylvania, covering the western third of the state. Pittsburgh is the region's principal city, with a metropolitan area population of about 2.4 million people, and serves as its economic ...

; Northeastern Ohio;

southwestern Ontario Southwestern Ontario is a secondary region of Southern Ontario in the Canadian province of Ontario. It occupies most of the Ontario Peninsula bounded by Lake Huron, including Georgian Bay, to the north and northwest; the St. Clair River, Lake ...

and central Ontario; Northeastern Illinois (along the shoreline of Lake Michigan); northwestern and north central

Indiana Indiana () is a U.S. state in the Midwestern United States. It is the 38th-largest by area and the 17th-most populous of the 50 States. Its capital and largest city is Indianapolis. Indiana was admitted to the United States as the 19th ...

(mostly between

Gary Gary may refer to: *Gary (given name), a common masculine given name, including a list of people and fictional characters with the name *Gary, Indiana, the largest city named Gary Places ;Iran *Gary, Iran, Sistan and Baluchestan Province ;Unit ...

and Elkhart); northern

Wisconsin Wisconsin () is a state in the upper Midwestern United States. Wisconsin is the 25th-largest state by total area and the 20th-most populous. It is bordered by Minnesota to the west, Iowa to the southwest, Illinois to the south, Lake M ...

(near Lake Superior); and

West Michigan West Michigan and Western Michigan are terms for an arbitrary region in the U.S. state of Michigan's Lower Peninsula. Most narrowly it refers to the Grand Rapids- Muskegon-Holland area, and more broadly to most of the region along the Lower ...

Tug Hill Tug Hill, sometimes referred to as the Tug Hill Plateau, is an upland region in northern New York State, famous for heavy winter snows. The Tug Hill region is east of Lake Ontario, north of Oneida Lake, and west of the Adirondack Mountains. The r ...

New York New York most commonly refers to: * New York City, the most populous city in the United States, located in the state of New York * New York (state), a state in the northeastern United States New York may also refer to: Film and television * '' ...

North Country North Country may refer to: Places * North Country, Cornwall, England * North Country, the northern third of New Hampshire, U.S. ** Great North Woods Region (New Hampshire) * North Country (New York), a region of Upstate New York ** North Country ...

region has the second-most snow amounts of any nonmountainous location within the continental U.S., trailing only the Upper Peninsula, which can average over of snow per year. Lake-effect snows on the Tug Hill plateau (east of

Lake Ontario Lake Ontario is one of the five Great Lakes of North America. It is bounded on the north, west, and southwest by the Canadian province of Ontario, and on the south and east by the U.S. state of New York. The Canada–United States border sp ...

) can frequently set daily records for snowfall in the United States. Tug Hill receives, typically, over of snow each winter. In February 2007, a prolonged lake-effect snow event left of snow on the Tug Hill Plateau. Syracuse, New York, directly south of the Tug Hill Plateau, receives significant lake-effect snow from Lake Ontario, and averages of snow per year, which is enough snowfall to be considered one of the "snowiest" large cities in America. A small amount of lake-effect snow from the

Finger Lakes The Finger Lakes are a group of eleven long, narrow, roughly north–south lakes located south of Lake Ontario in an area called the ''Finger Lakes region'' in New York, in the United States. This region straddles the northern and transitional ...

falls in upstate New York, as well. If the wind blows almost the entire length of either

Cayuga Lake Cayuga Lake (,,) is the longest of central New York's glacial Finger Lakes, and is the second largest in surface area (marginally smaller than Seneca Lake) and second largest in volume. It is just under long. Its average width is , and it is a ...

or Seneca Lake,

Ithaca Ithaca most commonly refers to: * Homer's Ithaca, an island featured in Homer's ''Odyssey'' * Ithaca (island), an island in Greece, possibly Homer's Ithaca *Ithaca, New York, a city, and home of Cornell University and Ithaca College Ithaca, Ithak ...

or Watkins Glen, respectively, can have a small lake-effect snowstorm.

Lake Erie Lake Erie ( "eerie") is the fourth largest lake by surface area of the five Great Lakes in North America and the eleventh-largest globally. It is the southernmost, shallowest, and smallest by volume of the Great Lakes and therefore also has t ...

produces a similar effect for a zone stretching from the eastern suburbs of

Cleveland Cleveland ( ), officially the City of Cleveland, is a city in the U.S. state of Ohio and the county seat of Cuyahoga County. Located in the northeastern part of the state, it is situated along the southern shore of Lake Erie, across the U ...

through

Erie Erie (; ) is a city on the south shore of Lake Erie and the county seat of Erie County, Pennsylvania, United States. Erie is the fifth largest city in Pennsylvania and the largest city in Northwestern Pennsylvania with a population of 94,831 at ...

Buffalo Buffalo most commonly refers to: * Bubalina, including most "Old World" buffalo, such as water buffalo * Bison, including the American buffalo * Buffalo, New York Buffalo or buffaloes may also refer to: Animals * Bubalina, a subtribe of the tr ...

. Remnants of lake-effect snows from Lake Erie have been observed to reach as far south as

Garrett County, Maryland Garrett County () is the westernmost county of the U.S. state of Maryland. As of the 2020 census, the population was 28,806, making it the third-least populous county in Maryland. Its county seat is Oakland. The county was named for John Wor ...

, and as far east as

Geneva, New York Geneva is a city in Ontario and Seneca counties in the U.S. state of New York. It is at the northern end of Seneca Lake; all land portions of the city are within Ontario County; the water portions are in Seneca County. The population was 13,26 ...

. Because it is not as deep as the other lakes, Erie warms rapidly in the spring and summer, and is frequently the only Great Lake to freeze over in winter. Once frozen, the resulting ice cover alleviates lake-effect snow downwind of the lake. Based on stable isotope evidence from lake sediment coupled with historical records of increasing lake-effect snow, global warming has been predicted to result in a further increase in lake-effect snow. A very large

in the United States exists on the

, near the cities of

Houghton Houghton may refer to: Places Australia * Houghton, South Australia, a town near Adelaide * Houghton Highway, the longest bridge in Australia, between Redcliffe and Brisbane in Queensland * Houghton Island (Queensland) Canada *Houghton Township, ...

, Marquette, and

Munising Munising ( ') is a city in Alger County in the U.S. state of Michigan. The population was 2,355 at the 2010 census. It is the county seat of Alger County. The city is partially surrounded by Munising Township, but the two are administered aut ...

. These areas typically receive of snow each season. For comparison, on the western shore,

Duluth, Minnesota , settlement_type = City , nicknames = Twin Ports (with Superior), Zenith City , motto = , image_skyline = , image_caption = Clockwise from top: urban Duluth skyline; Minnesota ...

receives per season.

Lake Superior Lake Superior in central North America is the largest freshwater lake in the world by surface areaThe Caspian Sea is the largest lake, but is saline, not freshwater. and the third-largest by volume, holding 10% of the world's surface fresh w ...

and

Lake Huron Lake Huron ( ) is one of the five Great Lakes of North America. Hydrologically, it comprises the easterly portion of Lake Michigan–Huron, having the same surface elevation as Lake Michigan, to which it is connected by the , Straits of Ma ...

rarely freeze because of their size and depth; hence, lake-effect snow can fall continually in the Upper Peninsula and Canadian snowbelts during the winter. Main areas of the Upper Peninsula snow belt include the

Keweenaw Peninsula The Keweenaw Peninsula ( , sometimes locally ) is the northernmost part of Michigan's Upper Peninsula. It projects into Lake Superior and was the site of the first copper boom in the United States, leading to its moniker of " Copper Country." As ...

and Baraga, Marquette and

Alger Alger may refer to: Places Algeria * French name for Algiers, the capital of Algeria ** Roman Catholic Archdiocese of Alger * Alger (department), a former French department (1848-1962) Russia * Alger Island, Russia United States * Alg ...

Counties, where Lake Superior contributes to lake-effect snow, making them a prominent part of the Midwestern snow belt. Records of of snow or more have been set in many communities in this area. The Keweenaw Peninsula averages more snowfall than almost anywhere in the United States—more than anywhere east of the

Mississippi River The Mississippi River is the second-longest river and chief river of the second-largest drainage system in North America, second only to the Hudson Bay drainage system. From its traditional source of Lake Itasca in northern Minnesota, it ...

and most of all nonmountainous regions of the continental United States. Because of the howling storms across Lake Superior, which cause dramatic amounts of precipitation, the lake-effect snow is said to make the Keweenaw Peninsula the snowiest place east of the

Rockies The Rocky Mountains, also known as the Rockies, are a major mountain range and the largest mountain system in North America. The Rocky Mountains stretch in straight-line distance from the northernmost part of western Canada, to New Mexico in ...

. Only one official weather station exists in this region. Located in

Hancock, Michigan Hancock is a city in Houghton County in the U.S. state of Michigan. It is across the Keweenaw Waterway from the city of Houghton on the Keweenaw Peninsula. The population was 4,634 at the 2010 census. The Weather Channel has consistently ranked ...

; this station averages well over per year. Farther north in the peninsula, lake-effect snow can occur with any wind direction. The road commission in

Keweenaw County, Michigan Keweenaw County (, ; , ) is a county in the Upper Peninsula of the U.S. state of Michigan, the state's northernmost county. As of the 2020 United States Census, the population was 2,046, making it Michigan's least populous county. It is also t ...

, collects unofficial data in a community called Delaware, and it strictly follows the guidelines set forth by the National Weather Service. This station averages over per season. Even farther north, a ski resort called Mount Bohemia receives an unofficial annual average of .

Herman, Michigan Herman is an unincorporated community in L'Anse Township of Baraga County in the U.S. state of Michigan. It was established in 1901 along a branch of the Duluth, South Shore and Atlantic Railway approximately midway between Nestoria Nestoria ...

, averages of snow every year. Lake-effect snow can cause blinding whiteouts in just minutes, and some storms can last days.

Western Michigan West Michigan and Western Michigan are terms for an arbitrary region in the U.S. state of Michigan's Lower Peninsula. Most narrowly it refers to the Grand Rapids-Muskegon-Holland area, and more broadly to most of the region along the Lower Peni ...

, western

Northern Lower Michigan Northern Michigan, also known as Northern Lower Michigan (known colloquially to residents of more southerly parts of the state and summer residents from cities such as Detroit as "Up North (disambiguation), Up North"), is a region of the U.S. st ...

, and

Northern Indiana Northern Indiana is a region of the U.S. State of Indiana, including 26 counties which border the states of Illinois, Michigan, and Ohio. Northern Indiana is also considered part of the Great Lakes Megalopolis. The area is generally classified i ...

can get heavy lake-effect snows as winds pass over Lake Michigan and deposit snows over

Muskegon Muskegon ( ') is a city in Michigan. It is the county seat of Muskegon County. Muskegon is known for fishing, sailing regattas, pleasure boating, and as a commercial and cruise ship port. It is a popular vacation destination because of the expan ...

Traverse City Traverse City ( ) is a city in the U.S. state of Michigan. It is the county seat of Grand Traverse County, although a small portion extends into Leelanau County. It is the largest city in the 21-county Northern Michigan region. The population was ...

Grand Rapids Grand Rapids is a city and county seat of Kent County in the U.S. state of Michigan. At the 2020 census, the city had a population of 198,917 which ranks it as the second most-populated city in the state after Detroit. Grand Rapids is the ...

Kalamazoo Kalamazoo ( ) is a city in the southwest region of the U.S. state of Michigan. It is the county seat of Kalamazoo County. At the 2010 census, Kalamazoo had a population of 74,262. Kalamazoo is the major city of the Kalamazoo-Portage Metropol ...

, New Carlisle,

South Bend South Bend is a city in and the county seat of St. Joseph County, Indiana, on the St. Joseph River near its southernmost bend, from which it derives its name. As of the 2020 census, the city had a total of 103,453 residents and is the fourt ...

, and Elkhart, but these snows abate significantly before

Lansing Lansing () is the capital of the U.S. state of Michigan. It is mostly in Ingham County, although portions of the city extend west into Eaton County and north into Clinton County. The 2020 census placed the city's population at 112,644, making ...

Fort Wayne, Indiana Fort Wayne is a city in and the county seat of Allen County, Indiana, United States. Located in northeastern Indiana, the city is west of the Ohio border and south of the Michigan border. The city's population was 263,886 as of the 2020 Censu ...

. When winds become northerly or aligned between 330 and 390°, a single band of lake-effect snow may form, which extends down the length of Lake Michigan. This long fetch often produces a very intense, yet localized, area of heavy snowfall, affecting cities such as Laporte and

. Lake-effect snow is uncommon in Detroit,

Toledo Toledo most commonly refers to: * Toledo, Spain, a city in Spain * Province of Toledo, Spain * Toledo, Ohio, a city in the United States Toledo may also refer to: Places Belize * Toledo District * Toledo Settlement Bolivia * Toledo, O ...

Milwaukee Milwaukee ( ), officially the City of Milwaukee, is both the most populous and most densely populated city in the U.S. state of Wisconsin and the county seat of Milwaukee County, Wisconsin, Milwaukee County. With a population of 577,222 at th ...

, and Chicago, because the region's dominant winds are from the northwest, making them upwind from their respective Great Lakes, although they, too, can see lake-effect snow during easterly or northeasterly winds. More frequently, the north side of a low-pressure system picks up more moisture over the lake as it travels east, creating a phenomenon called lake-enhanced precipitation. File:Buffalo2001-20.jpg,

Buffalo, New York Buffalo is the second-largest city in the U.S. state of New York (behind only New York City) and the seat of Erie County. It is at the eastern end of Lake Erie, at the head of the Niagara River, and is across the Canadian border from Sou ...

, after of snow fell from December 24, 2001, to December 28, 2001 File:Fultonles.jpg, Fulton, New York, after a snowburst dropped of snow over most of Oswego County January 28–31, 2004 File:Snow-removal-cleveland-4.jpg, The Veteran's Day storm of November 9–14, 1996, may be the most severe early-season lake-effect snow storm the Great Lakes has witnessed in the past 50 years. At the height of the storm, over 160,000 customers were without power in Greater Cleveland alone, as the storm produced isolated snowfall tallies approaching .

Ontario, Canada

Because Southwestern Ontario is surrounded by water on three sides, many parts of Southwestern and Central Ontario get a large part of their winter snow from lake-effect snow. This region is notorious for the whiteouts that can suddenly reduce highway visibility on North America’s busiest highway (

Ontario Highway 401 King's Highway 401, commonly referred to as Highway 401 and also known by its official name as the Macdonald–Cartier Freeway or colloquially referred to as the four-oh-one, is a Controlled-access highway, controlled-access 400-series high ...

) from clear to zero. The region most commonly affected spans from

Port Stanley Stanley (; also known as Port Stanley) is the capital city of the Falkland Islands. It is located on the island of East Falkland, on a north-facing slope in one of the wettest parts of the islands. At the 2016 census, the city had a popula ...

in the west, the

Bruce Peninsula The Bruce Peninsula is a peninsula in Ontario, Canada, that divides Georgian Bay of Lake Huron from the lake's main basin. The peninsula extends roughly northwestwards from the rest of Southwestern Ontario, pointing towards Manitoulin Islan ...

in the north,

Niagara-on-the-Lake Niagara-on-the-Lake is a town in Ontario, Canada. It is located on the Niagara Peninsula at the point where the Niagara River meets Lake Ontario, across the river from New York, United States. Niagara-on-the-Lake is in the Niagara Region of ...

to the east, and

Fort Erie Fort Erie is a town on the Niagara River in the Niagara Region, Ontario, Canada. It is directly across the river from Buffalo, New York, and is the site of Old Fort Erie which played a prominent role in the War of 1812. Fort Erie is one o ...

to the south. The heaviest accumulations usually happen in the Bruce Peninsula, which is between

and Georgian Bay. So long as the Great Lakes are not frozen over, the only time the Bruce Peninsula does not get lake-effect snow is when the wind is directly from the south. Toronto and Hamilton are usually spared lake-effect squalls because they are not on the leeward side of Lake Ontario during the dominant northwest winds. Some central and northern portions of the Greater Toronto Area, though, can be affected a few times each year by lake-effect snow from

Georgian Bay Georgian Bay (french: Baie Georgienne) is a large bay of Lake Huron, in the Laurentia bioregion. It is located entirely within the borders of Ontario, Canada. The main body of the bay lies east of the Bruce Peninsula and Manitoulin Island. To ...

. Downtown Toronto and Hamilton get most of their lake-effect snow when the wind comes from the southeast or east, over Lake Ontario. Such easterly winds are usually associated with a winter cyclone passing just to the south of the Great Lakes. When the wind is from the north, the

runs north-south from

Grand Bend Grand Bend is a community located on the shores of Lake Huron in Southwestern Ontario, Canada. It is part of the Municipality of Lambton Shores in Lambton County. History Grand Bend is situated on the traditional territory of the Attawandaro ...

Sarnia Sarnia is a city in Lambton County, Ontario, Canada. It had a 2021 population of 72,047, and is the largest city on Lake Huron. Sarnia is located on the eastern bank of the junction between the Upper and Lower Great Lakes where Lake Huron ...

and

London London is the capital and List of urban areas in the United Kingdom, largest city of England and the United Kingdom, with a population of just under 9 million. It stands on the River Thames in south-east England at the head of a estuary dow ...

. Areas such as

Lucan Marcus Annaeus Lucanus (3 November 39 AD – 30 April 65 AD), better known in English as Lucan (), was a Roman poet, born in Corduba (modern-day Córdoba), in Hispania Baetica. He is regarded as one of the outstanding figures of the Imperial ...

and

Kincardine Kincardine may refer to: Places Scotland *Kincardine, Fife, a town on the River Forth, Scotland **Kincardine Bridge, a bridge which spans the Firth of Forth *Kincardineshire, a historic county **Kincardine, Aberdeenshire, now abandoned **Kincardi ...

have experienced some of the heaviest snowsqualls from Lake Huron in this region. When the wind is slightly more westerly, the snowbelt runs from Tobermory,

Owen Sound Owen Sound ( 2021 Census population 21,612) is a city in Southwestern Ontario, Canada. The county seat of Grey County, it is located at the mouths of the Pottawatomi and Sydenham Rivers on an inlet of Georgian Bay. The primary tourist attr ...

, and Grand Bend to as far south and east as

Arthur Arthur is a common male given name of Brythonic origin. Its popularity derives from it being the name of the legendary hero King Arthur. The etymology is disputed. It may derive from the Celtic ''Artos'' meaning “Bear”. Another theory, more w ...

, Orangeville and Caledon. This snowbelt often reaches

Kitchener Kitchener may refer to: People * Earl Kitchener, a title in the Peerage of the United Kingdom ** Herbert Kitchener, 1st Earl Kitchener (1850–1916), British Field Marshal and 1st Earl Kitchener ** Henry Kitchener, 2nd Earl Kitchener (1846–1937) ...

and can affect the Halton and

Peel Peel or Peeling may refer to: Places Australia * Peel (Western Australia) * Peel Island, Queensland *Peel, New South Wales * Peel River (New South Wales) Canada * Peel Parish, New Brunswick * Peel, New Brunswick, an unincorporated communi ...

regions of the Greater Toronto Area. These northwesterly winds usually also bring snow southeast of Georgian Bay, which can reach beyond

Lake Scugog Lake Scugog is an artificially flooded lake in Scugog, Regional Municipality of Durham and the unitary city of Kawartha Lakes in central Ontario, Canada. It lies between the communities of Port Perry and Lindsay. The lake has been raised a ...

. A westerly wind sends lake-effect streamers east from Owen Sound to Gravenhurst,

Barrie Barrie is a city in Southern Ontario, Canada, about north of Toronto. The city is within Simcoe County and located along the shores of Kempenfelt Bay, the western arm of Lake Simcoe. Although physically in Simcoe County, Barrie is politically i ...

, and

Orillia Orillia is a city in Ontario, Canada. It is in Simcoe County between Lake Couchiching and Lake Simcoe. Although it is geographically located within Simcoe County, the city is a single-tier municipality. It is part of the Huronia region of C ...

, and may even reach as far south and east as

York Region The Regional Municipality of York, also called York Region, is a regional municipality in Southern Ontario, Canada, between Lake Simcoe and Toronto. The region was established after the passing of then Bill 102, An Act to Establish The Regional M ...

in the Greater Toronto Area. When the wind is from the southwest, lake-effect streamers from Lake Huron and Georgian Bay run from Noelville to

Sudbury Sudbury may refer to: Places Australia * Sudbury Reef, Queensland Canada * Greater Sudbury, Ontario (official name; the city continues to be known simply as Sudbury for most purposes) ** Sudbury (electoral district), one of the city's federal e ...

, Gravenhurst, and

Algonquin Provincial Park Algonquin Provincial Park is a provincial park located between Georgian Bay and the Ottawa River in Ontario, Canada, mostly within the Unorganized South Part of Nipissing District. Established in 1893, it is the oldest provincial park in Ca ...

. Winds from this same direction coming over Lake Ontario cause squalls to come ashore from

Cobourg Cobourg ( ) is a town in the Canadian province of Ontario, located in Southern Ontario east of Toronto and east of Oshawa. It is the largest town in and seat of Northumberland County. Its nearest neighbour is Port Hope, to the west. It is ...

through the

Belleville Belleville (French, literally "beautiful town") may refer to: Places Canada * Belleville, New Brunswick, an unincorporated community in Wakefield Parish * Belleville, Nova Scotia * Belleville, Ontario France * Belleville, Deux-Sèvres, in the ...

area to

Kingston Kingston may refer to: Places * List of places called Kingston, including the five most populated: ** Kingston, Jamaica ** Kingston upon Hull, England ** City of Kingston, Victoria, Australia ** Kingston, Ontario, Canada ** Kingston upon Thames, ...

and the

Thousand Islands The Thousand Islands (french: Mille-Îles) constitute a North American archipelago of 1,864 islands that straddles the Canada–US border in the Saint Lawrence River as it emerges from the northeast corner of Lake Ontario. They stretch for ab ...

, with Prince Edward County being the area most vulnerable to extreme snowfall amounts. Some snow bands can occasionally reach

Quebec Quebec ( ; )According to the Government of Canada, Canadian government, ''Québec'' (with the acute accent) is the official name in Canadian French and ''Quebec'' (without the accent) is the province's official name in Canadian English is ...

and

Maine Maine () is a U.S. state, state in the New England and Northeastern United States, Northeastern regions of the United States. It borders New Hampshire to the west, the Gulf of Maine to the southeast, and the Provinces and territories of Canad ...

, while snow originating from Lake Erie, Lake Ontario, and even Lake Michigan can impact southern Ontario. Easterly winds primarily affect the Niagara Peninsula. Local lake-effect snowsqualls can occasionally occur downwind of

Lake Simcoe Lake Simcoe is a lake in southern Ontario, Canada, the fourth-largest lake wholly in the province, after Lake Nipigon, Lac Seul, and Lake Nipissing. At the time of the first European contact in the 17th century the lake was called ''Ouentironk'' ...

when the lake is unfrozen, usually in early winter or late fall. Lake Superior has its own independent snowbelts, affecting Wawa,

Sault Ste. Marie Sault Ste. Marie is a cross-border region of Canada and the United States located on St. Marys River, which drains Lake Superior into Lake Huron. Founded as a single settlement in 1668, Sault Ste. Marie was divided in 1817 by the establishment of ...

Marathon The marathon is a long-distance foot race with a distance of , usually run as a road race, but the distance can be covered on trail routes. The marathon can be completed by running or with a run/walk strategy. There are also wheelchair di ...

, the Keweenaw Peninsula in Upper Michigan, and

Pukaskwa National Park Pukaskwa National Park ( ) is a national park located south of the town of Marathon, Ontario in the Thunder Bay District of northern Ontario, Canada. Established in 1978, Pukaskwa is known for its vistas of Lake Superior and boreal forests. The pa ...

Thunder Bay Thunder Bay is a city in and the seat of Thunder Bay District, Ontario, Canada. It is the most populous municipality in Northwestern Ontario and the second most populous (after Greater Sudbury) municipality in Northern Ontario; its populatio ...

is usually not affected by lake-effect snow, unless it is associated with a winter storm.

Elsewhere in the United States

The southern and southeastern sides of the Great Salt Lake receive significant lake-effect snow. Since the Great Salt Lake never freezes, the lake effect can influence the weather along the

Wasatch Front The Wasatch Front is a metropolitan region in the north-central part of the U.S. state of Utah. It consists of a chain of contiguous cities and towns stretched along the Wasatch Range from approximately Provo in the south to Logan in the nort ...

year-round. The lake effect largely contributes to the annual snowfall amounts recorded south and east of the lake, and in average snowfall reaching in the

Wasatch Range The Wasatch Range ( ) or Wasatch Mountains is a mountain range in the western United States that runs about from the Utah-Idaho border south to central Utah. It is the western edge of the greater Rocky Mountains, and the eastern edge of the ...

. The snow, which is often very light and dry because of the semiarid climate, is referred to as the "Greatest Snow on Earth" in the mountains. Lake-effect snow contributes to roughly six to eight snowfalls per year in

Salt Lake City Salt Lake City (often shortened to Salt Lake and abbreviated as SLC) is the capital and most populous city of Utah, United States. It is the seat of Salt Lake County, the most populous county in Utah. With a population of 200,133 in 2020, th ...

, with about 10% of the city's precipitation being contributed by the phenomenon. Similar snowfall can occur near large inland bays, where it is known as bay-effect snow. Bay-effect snows fall downwind of

Delaware Bay Delaware Bay is the estuary outlet of the Delaware River on the northeast seaboard of the United States. It is approximately in area, the bay's freshwater mixes for many miles with the saltwater of the Atlantic Ocean. The bay is bordered inla ...

Chesapeake Bay The Chesapeake Bay ( ) is the largest estuary in the United States. The Bay is located in the Mid-Atlantic (United States), Mid-Atlantic region and is primarily separated from the Atlantic Ocean by the Delmarva Peninsula (including the parts: the ...

, and

Massachusetts Bay Massachusetts Bay is a bay on the Gulf of Maine that forms part of the central coastline of the Commonwealth of Massachusetts. Description The bay extends from Cape Ann on the north to Plymouth Harbor on the south, a distance of about . Its ...

when the basic criteria are met, and on rarer occasions along Long Island. The

are long enough for lake-effect precipitation. The

Texas Texas (, ; Spanish language, Spanish: ''Texas'', ''Tejas'') is a state in the South Central United States, South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2 ...

twin cities of

Sherman Sherman most commonly refers to: *Sherman (name), a surname and given name (and list of persons with the name) ** William Tecumseh Sherman (1820–1891), American Civil War General *M4 Sherman, a tank Sherman may also refer to: Places United St ...

and Denison are known, in rare instances, to have experienced lake-effect snow from nearby

Lake Texoma Lake Texoma is one of the largest reservoirs in the United States, the 12th largest US Army Corps of Engineers' (USACE) lake, and the largest in USACE Tulsa District. Lake Texoma is formed by Denison Dam on the Red River in Bryan County, Oklahom ...

due to the lake's size (it is the third-largest lake in Texas or along its borders). On one occasion in December 2016, lake-effect snow fell in central

Mississippi Mississippi () is a state in the Southeastern region of the United States, bordered to the north by Tennessee; to the east by Alabama; to the south by the Gulf of Mexico; to the southwest by Louisiana; and to the northwest by Arkansas. Mis ...

from a lake band off

Ross Barnett Reservoir The Ross Barnett Reservoir, often called the Rez, is a reservoir of the Pearl River between Madison and Rankin counties in the U.S. state of Mississippi. The lake serves as the state's largest drinking water resource, and is managed by the Pear ...

. Oklahoma City even had a band of lake-effect snow off of

Lake Hefner Lake Hefner is a reservoir in northwestern Oklahoma City, Oklahoma. It was built in the 1940s to expand the water supply for the city of Oklahoma City,Lake Oolagah during a winter storm in February 2021. The

Truckee Meadows The Truckee Meadows is a valley in Northern Nevada, named for the Truckee River, which collects and drains all water in the valley. Truckee Meadows is also colloquially used as a name for the Reno–Tahoe-Fernley CSA area, even though the metro a ...

and other parts of northern Nevada, which are normally in the

rain shadow A rain shadow is an area of significantly reduced rainfall behind a mountainous region, on the side facing away from prevailing winds, known as its leeward side. Evaporated moisture from water bodies (such as oceans and large lakes) is carri ...

of the

Sierra Nevada The Sierra Nevada () is a mountain range in the Western United States, between the Central Valley of California and the Great Basin. The vast majority of the range lies in the state of California, although the Carson Range spur lies primari ...

, when conditions are right, can have severe snowfall as a result of lake effect from

Lake Tahoe Lake Tahoe (; was, Dáʔaw, meaning "the lake") is a freshwater lake in the Sierra Nevada of the United States. Lying at , it straddles the state line between California and Nevada, west of Carson City. Lake Tahoe is the largest alpine lake ...

. Recent severe examples of this phenomenon have occurred as recently as 2004, dumping several feet of snow in the normally dry region. The West Coast occasionally experiences ocean-effect showers, usually in the form of rain at lower elevations south of about the mouth of the Columbia River. These occur whenever an Arctic air mass from western Canada is drawn westward out over the Pacific Ocean, typically by way of the

Fraser Valley The Fraser Valley is a geographical region in southwestern British Columbia, Canada and northwestern Washington State. It starts just west of Hope in a narrow valley encompassing the Fraser River and ends at the Pacific Ocean stretching from the ...

, returning shoreward around a center of low pressure. Cold air flowing southwest from the Fraser Valley can also pick up moisture over the

Strait of Georgia The Strait of Georgia (french: Détroit de Géorgie) or the Georgia Strait is an arm of the Salish Sea between Vancouver Island and the extreme southwestern mainland coast of British Columbia, Canada and the extreme northwestern mainland coast ...

and

Strait of Juan de Fuca The Strait of Juan de Fuca (officially named Juan de Fuca Strait in Canada) is a body of water about long that is the Salish Sea's outlet to the Pacific Ocean. The international boundary between Canada and the United States runs down the centre ...

, then rise over the northeastern slopes of the

Olympic Mountains The Olympic Mountains are a mountain range on the Olympic Peninsula of the Pacific Northwest of the United States. The mountains, part of the Pacific Coast Ranges, are not especially high – Mount Olympus is the highest at ; however, the east ...

, producing heavy, localized snow between

Port Angeles Port Angeles ( ) is a city and county seat of Clallam County, Washington, United States. With a population of 19,960 as of the 2020 census, it is the largest city in the county. The population was estimated at 20,134 in 2021. The city's harb ...

and

Sequim Sequim ( ) is a city in Clallam County, Washington, United States. It is located along the Dungeness River near the base of the Olympic Mountains. The 2010 census counted a population of 6,606. Sequim lies within the rain shadow of the Olympic M ...

, as well as areas in

Kitsap County Kitsap County is located in the U.S. state of Washington. As of the 2020 census, its population was 275,611. Its county seat is Port Orchard, and its largest city is Bremerton. The county was formed out of King County and Jefferson County on J ...

and the

Puget Sound region The Puget Sound region is a coastal area of the Pacific Northwest in the U.S. state of Washington, including Puget Sound, the Puget Sound lowlands, and the surrounding region roughly west of the Cascade Range and east of the Olympic Mountai ...

. While snow of any type is very rare in Florida, the phenomenon of gulf-effect snow has been observed along the northern coast of the

Gulf of Mexico The Gulf of Mexico ( es, Golfo de México) is an ocean basin and a marginal sea of the Atlantic Ocean, largely surrounded by the North American continent. It is bounded on the northeast, north and northwest by the Gulf Coast of the United S ...

a few times in history. More recently, "ocean-effect" snow occurred on January 24, 2003, when wind off the Atlantic, combined with air temperatures in the 30 °F range, brought snow flurries briefly to the Atlantic Coast of northern Florida seen in the air as far south as Cape Canaveral.

Elsewhere in Canada

Lake Winnipeg Lake Winnipeg (french: Lac Winnipeg, oj, ᐑᓂᐸᑲᒥᐠᓴᑯ˙ᑯᐣ, italics=no, Weenipagamiksaguygun) is a very large, relatively shallow lake in North America, in the province of Manitoba, Canada. Its southern end is about north of t ...

Lake Manitoba Lake Manitoba (french: Lac Manitoba) is the 14th largest lake in Canada and the 33rd largest lake in the world with a total area of . It is located within the Canadian province of Manitoba about northwest of the province's capital, Winnipeg, at ...

and

Lake Winnipegosis Lake Winnipegosis is a large (5,370 km2) lake in central North America, in Manitoba, Canada, some 300 km northwest of Winnipeg. It is Canada's eleventh-largest lake. An alternate spelling, once common but now rare, is Lake Winipigoos o ...

in Manitoba historically have seen lake-effect snow as early as late October, and it is common throughout early to mid-November. Towards the end of November, the lakes sufficiently cool and begin to freeze, ending the lake-effect snow. A brief period of lake-effect snow is also common near

Great Bear Lake Great Bear Lake ( den, Sahtú; french: Grand lac de l'Ours) is a lake in the boreal forest of Canada. It is the largest lake entirely in Canada (Lake Superior and Lake Huron are larger but straddle the Canada–US border), the fourth-largest i ...

and

Great Slave Lake Great Slave Lake (french: Grand lac des Esclaves), known traditionally as Tıdeè in Tłı̨chǫ Yatıì (Dogrib), Tinde’e in Wıìlıìdeh Yatii / Tetsǫ́t’ıné Yatıé (Dogrib / Chipewyan), Tu Nedhé in Dëne Sųłıné Yatıé (Chi ...

in the

Northwest Territories The Northwest Territories (abbreviated ''NT'' or ''NWT''; french: Territoires du Nord-Ouest, formerly ''North-Western Territory'' and ''North-West Territories'' and namely shortened as ''Northwest Territory'') is a federal territory of Canada. ...

during early winter (usually early to mid-October); the lake-effect season for both lakes is very short, though. The lakes are frozen roughly eight months of the year, and as a result, have very little time to warm during the summer. Other small lakes such as

Lake Athabasca Lake Athabasca (; French: ''lac Athabasca''; from Woods Cree: , " herethere are plants one after another") is located in the north-west corner of Saskatchewan and the north-east corner of Alberta between 58° and 60° N in Canada. The lake ...

in northern

Saskatchewan Saskatchewan ( ; ) is a province in western Canada, bordered on the west by Alberta, on the north by the Northwest Territories, on the east by Manitoba, to the northeast by Nunavut, and on the south by the U.S. states of Montana and North ...

and

Lake Nipigon Lake Nipigon (; french: lac Nipigon; oj, Animbiigoo-zaaga'igan) is part of the Great Lakes drainage basin. It is the largest lake entirely within the boundaries of the Canadian province of Ontario. Etymology In the Jesuit Relations the lake is ...

in northwestern

Ontario Ontario ( ; ) is one of the thirteen provinces and territories of Canada.Ontario is located in the geographic eastern half of Canada, but it has historically and politically been considered to be part of Central Canada. Located in Central C ...

produce early-season lake-effect snows. Smallwood Reservoir, a man-made lake located in

Labrador , nickname = "The Big Land" , etymology = , subdivision_type = Country , subdivision_name = Canada , subdivision_type1 = Province , subdivision_name1 ...

, has on occasion generated lake-effect snow. The Canadian

Maritimes The Maritimes, also called the Maritime provinces, is a region of Eastern Canada consisting of three provinces: New Brunswick, Nova Scotia, and Prince Edward Island. The Maritimes had a population of 1,899,324 in 2021, which makes up 5.1% of Ca ...

, specifically

Nova Scotia Nova Scotia ( ; ; ) is one of the thirteen provinces and territories of Canada. It is one of the three Maritime provinces and one of the four Atlantic provinces. Nova Scotia is Latin for "New Scotland". Most of the population are native En ...

and

Prince Edward Island Prince Edward Island (PEI; ) is one of the thirteen provinces and territories of Canada. It is the smallest province in terms of land area and population, but the most densely populated. The island has several nicknames: "Garden of the Gulf", ...

, are often affected by such snow squalls when an Arctic winter airmass moves over unfrozen waters. In PEI, sea-effect snow is often generated when a cold north wind blows over the unfrozen

Gulf of St. Lawrence , image = Baie de la Tour.jpg , alt = , caption = Gulf of St. Lawrence from Anticosti National Park, Quebec , image_bathymetry = Golfe Saint-Laurent Depths fr.svg , alt_bathymetry = Bathymetry ...

, dumping heavy snow on the north shore. In Nova Scotia, a cold north-west wind can produce sea-effect snow over the

Cape Breton Highlands The Cape Breton Highlands (french: Plateau du Cap-Breton, gd, Àrd-thalamh Cheap Bhreatainn), commonly called the Highlands, refer to a highland or mountainous plateau across the northern part of Cape Breton Island in the Canadian province of N ...

from the Gulf of St. Lawrence, and the

Annapolis Valley The Annapolis Valley is a valley and region in the Canadian province of Nova Scotia. It is located in the western part of the Nova Scotia peninsula, formed by a trough between two parallel mountain ranges along the shore of the Bay of Fundy. St ...

from the

Bay of Fundy The Bay of Fundy (french: Baie de Fundy) is a bay between the Canadian provinces of New Brunswick and Nova Scotia, with a small portion touching the U.S. state of Maine. It is an arm of the Gulf of Maine. Its extremely high tidal range is th ...

; in the latter case, the sea-effect snow season can continue all winter as the Bay of Fundy remains open owing to its extreme tidal currents. The east coast of southern

Vancouver Island Vancouver Island is an island in the northeastern Pacific Ocean and part of the Canadian province of British Columbia. The island is in length, in width at its widest point, and in total area, while are of land. The island is the largest by ...

, British Columbia, experiences occasional episodes of sea-effect snow during winter due to cold easterly outflow winds from the British Columbia interior, typically through the Fraser Valley, crossing the always open waters of the

Eurasia

Lake-effect or sea-effect snow occurs in other countries, near large lakes or large sea areas. In

Eurasia Eurasia (, ) is the largest continental area on Earth, comprising all of Europe and Asia. Primarily in the Northern and Eastern Hemispheres, it spans from the British Isles and the Iberian Peninsula in the west to the Japanese archipelag ...

, it occurs in the regions of the

in Georgia, Romania, Bulgaria and northern Turkey, the

in Iran, the

in Italy, the

, the

Irish Sea The Irish Sea or , gv, Y Keayn Yernagh, sco, Erse Sie, gd, Muir Èireann , Ulster-Scots: ''Airish Sea'', cy, Môr Iwerddon . is an extensive body of water that separates the islands of Ireland and Great Britain. It is linked to the Ce ...

, the

Aegean Sea The Aegean Sea ; tr, Ege Denizi (Greek: Αιγαίο Πέλαγος: "Egéo Pélagos", Turkish: "Ege Denizi" or "Adalar Denizi") is an elongated embayment of the Mediterranean Sea between Europe and Asia. It is located between the Balkans an ...

, the Balearic Islands, and the

, as well as areas surrounding the

Sea of Japan The Sea of Japan is the marginal sea between the Japanese archipelago, Sakhalin, the Korean Peninsula, and the mainland of the Russian Far East. The Japanese archipelago separates the sea from the Pacific Ocean. Like the Mediterranean Sea, it h ...

. Because the southern Black Sea is relatively warm (around 13 °C or 55 °F at the beginning of winter, typically 10 to 6 °C or 50 to 43 °F by the end), sufficiently cold air aloft can create significant snowfalls in a relatively short period of time. Due to its location on a peninsula between the Black Sea and the

Sea of Marmara The Sea of Marmara,; grc, Προποντίς, Προποντίδα, Propontís, Propontída also known as the Marmara Sea, is an inland sea located entirely within the borders of Turkey. It connects the Black Sea to the Aegean Sea via the ...

Istanbul Istanbul ( , ; tr, İstanbul ), formerly known as Constantinople ( grc-gre, Κωνσταντινούπολις; la, Constantinopolis), is the List of largest cities and towns in Turkey, largest city in Turkey, serving as the country's economic, ...

is very prone to lake-effect snow and this weather phenomenon occurs almost every winter. This type of precipitation is generated by the warmer Black Sea temperature and colder air temperature, over the Istanbul area. In February 2005, a lake-effect snowfall left of snow, and in March 1987, a three-week-long lake-effect snowfall accompanied with strong winds (lake-effect blizzard) left of snow in Istanbul. The snowfall in the eastern regions of the Black Sea is amplified by the orographic effect of the nearby

Caucasus Mountains The Caucasus Mountains, : pronounced * hy, Կովկասյան լեռներ, : pronounced * az, Qafqaz dağları, pronounced * rus, Кавка́зские го́ры, Kavkázskiye góry, kɐfˈkasːkʲɪje ˈɡorɨ * tr, Kafkas Dağla ...

, often resulting in snowfall of several meters, especially at higher elevations. In the Adriatic regions of

Italy Italy ( it, Italia ), officially the Italian Republic, ) or the Republic of Italy, is a country in Southern Europe. It is located in the middle of the Mediterranean Sea, and its territory largely coincides with the homonymous geographical ...

and in the eastern

Apennine Mountains The Apennines or Apennine Mountains (; grc-gre, links=no, Ἀπέννινα ὄρη or Ἀπέννινον ὄρος; la, Appenninus or – a singular with plural meaning;''Apenninus'' (Greek or ) has the form of an adjective, which wou ...

, the sea-effect snow phenomenon with air masses coming from Northern or Eastern Europe (and Russia) can be incredibly heavy and can last for days. In the hills and mountains, it can result in snowfalls of several meters, as it happened in February 2012. These huge amounts of snow can also fall in short periods of time. In Northern Europe, cold, dry air masses from Russia can blow over the

and cause heavy snow squalls on areas of the southern and eastern coasts of Sweden, as well as on the Danish island of

Bornholm Bornholm () is a Danish island in the Baltic Sea, to the east of the rest of Denmark, south of Sweden, northeast of Germany and north of Poland. Strategically located, Bornholm has been fought over for centuries. It has usually been ruled by ...

, the east coast of

Jutland Jutland ( da, Jylland ; german: Jütland ; ang, Ēota land ), known anciently as the Cimbric or Cimbrian Peninsula ( la, Cimbricus Chersonesus; da, den Kimbriske Halvø, links=no or ; german: Kimbrische Halbinsel, links=no), is a peninsula of ...

and the northern coast of

Poland Poland, officially the Republic of Poland, , is a country in Central Europe. Poland is divided into Voivodeships of Poland, sixteen voivodeships and is the fifth most populous member state of the European Union (EU), with over 38 mill ...

. For the northern parts of the Baltic Sea, this happens mainly in the early winter, since it freezes later. Southeast Norway can also experience heavy sea snow events with east-north-easterly winds. Especially, coastal areas from Kragero to Kristiansand have had incredible snow depths in the past with intense persistent snowbands from Norwegian Sea (the coastal city of Arendal recorded in a single week in late February 2007). Although Fennoscandia is lined with an abundance of lakes, this type of snowfall is rare in these, due to the shallow freshwater freezing early in the cold interiors. One notable exception happened in the middle of May 2008, as

Leksand Leksand () is a locality and the seat of Leksand Municipality in Dalarna County, Sweden, with 5,934 inhabitants in 2010. Sport Leksand is famous for the Leksands IF ice hockey team, who have won 4 Swedish Championships, although the team is curre ...

on the since-long unfrozen lake of Siljan got on the ground. The Sea of Japan creates snowfall in the mountainous western Japanese prefectures of Niigata and Nagano, parts of which are known collectively as

snow country is a novel by the Japanese author Yasunari Kawabata. The novel is considered a classic work of Japanese literature and was among the three novels the Nobel Committee cited in 1968, when Kawabata was awarded the Nobel Prize in Literature. Writ ...

(''Yukiguni''). In addition to the Sea of Japan, other parts of Japan, as well as Korea and

Shandong Peninsula The Shandong (Shantung) Peninsula or Jiaodong (Chiaotung) Peninsula is a peninsula in Shandong Province in eastern China, between the Bohai Sea to the north and the Yellow Sea to the south. The latter name refers to the east and Jiaozhou. Geo ...

, experience these same conditions. Because the Aegean Sea (Greece), is warm in the winter, when cold air masses from Siberia advance in the area, they pick up much moisture, resulting in heavy snowfalls in eastern

Central Greece Continental Greece ( el, Στερεά Ελλάδα, Stereá Elláda; formerly , ''Chérsos Ellás''), colloquially known as Roúmeli (Ρούμελη), is a traditional geographic region of Greece. In English, the area is usually called Central ...

, eastern

Thessaly Thessaly ( el, Θεσσαλία, translit=Thessalía, ; ancient Thessalian: , ) is a traditional geographic and modern administrative region of Greece, comprising most of the ancient region of the same name. Before the Greek Dark Ages, The ...

, eastern

Peloponnese The Peloponnese (), Peloponnesus (; el, Πελοπόννησος, Pelopónnēsos,(), or Morea is a peninsula and geographic region in southern Greece. It is connected to the central part of the country by the Isthmus of Corinth land bridge whi ...

, south-eastern

Chalkidiki Chalkidiki (; el, Χαλκιδική , also spelled Halkidiki, is a peninsula and regional unit of Greece, part of the region of Central Macedonia, in the geographic region of Macedonia in Northern Greece. The autonomous Mount Athos region co ...

, the

Cyclades The Cyclades (; el, Κυκλάδες, ) are an island group in the Aegean Sea, southeast of mainland Greece and a former administrative prefecture of Greece. They are one of the island groups which constitute the Aegean archipelago. The na ...

, and

Crete Crete ( el, Κρήτη, translit=, Modern: , Ancient: ) is the largest and most populous of the Greek islands, the 88th largest island in the world and the fifth largest island in the Mediterranean Sea, after Sicily, Sardinia, Cypru ...

(more commonly in the mountainous areas). In 2008, a severe snowstorm blanketed

Athens Athens ( ; el, Αθήνα, Athína ; grc, Ἀθῆναι, Athênai (pl.) ) is both the capital city, capital and List of cities and towns in Greece, largest city of Greece. With a population close to four million, it is also the seventh List ...

, dropping of snow and causing huge traffic jams. Moving of polar or Siberian high-pressure centers along Caspian Sea regarding to relatively warmer water of this sea can make heavy snowfalls in the northern coast of Iran. Several blizzards have been reported in this region during the last decades. In February 2014, heavy snowfall reached on the coastline in Gilan and Mazandaran provinces of Iran. The heaviest snowfall was reported in Abkenar village near

Anzali Lagoon Anzali Lagoon ( fa, تالاب انزلی) (also Anzali Mordab, Anzali Bay, Pahlavi Mordab, Pahlavi Bay or Anzali Liman)< ...

. File:Caspian-lake-effect.gif, IRIMO radar animation of lake effect snow in southern coast of Caspian Sea in the north of Iran File:Caspiansatelliteimage.jpg, Lake-effect clouds over

on January 7, 2008 File:Lake effect pic.jpg, Lake effect snow in

on February 16, 2021 File:Lake effect pic 1.jpg, Lake effect snow in

on February 16, 2021

United Kingdom

In the United Kingdom, easterly winds bringing cold continental air across the

can lead to a similar phenomenon. Locally, it is also known as "lake-effect snow" despite the snow coming in from the sea rather than a lake. Similarly during a north-westerly wind, snow showers can form coming in from the

Liverpool Bay Liverpool Bay is a bay of the Irish Sea between northeast Wales, Cheshire, Lancashire and Merseyside to the east of the Irish Sea. The bay is a classic example of a region of freshwater influence. Liverpool Bay has historically suffered from redu ...

, coming down the Cheshire gap, causing snowfall in the

West Midlands West or Occident is one of the four cardinal directions or points of the compass. It is the opposite direction from east and is the direction in which the Sun sets on the Earth. Etymology The word "west" is a Germanic word passed into some Ro ...

—this formation resulted in the white Christmas of 2004 in the area, and most recently the heavy snowfall of 8 December 2017 and 30 January 2019. A similar phenomenon can affect the city of

Inverness Inverness (; from the gd, Inbhir Nis , meaning "Mouth of the River Ness"; sco, Innerness) is a city in the Scottish Highlands. It is the administrative centre for The Highland Council and is regarded as the capital of the Highlands. Histo ...

in the

Scottish Highlands The Highlands ( sco, the Hielands; gd, a’ Ghàidhealtachd , 'the place of the Gaels') is a historical region of Scotland. Culturally, the Highlands and the Lowlands diverged from the Late Middle Ages into the modern period, when Lowland ...

, where cold north-east winds cause heavy snow to form in the

Moray Firth The Moray Firth (; Scottish Gaelic: ''An Cuan Moireach'', ''Linne Mhoireibh'' or ''Caolas Mhoireibh'') is a roughly triangular inlet (or firth) of the North Sea, north and east of Inverness, which is in the Highland council area of north of Scot ...

; this was the case with the White Hogmanay of 2009, which caused the street party to be cancelled. Northerly and north-westerly winds can cause the effect to occur over the

and

Bristol Channel The Bristol Channel ( cy, Môr Hafren, literal translation: "Severn Sea") is a major inlet in the island of Great Britain, separating South Wales from Devon and Somerset in South West England. It extends from the lower estuary of the River S ...

feeding snow into

South West England South West England, or the South West of England, is one of nine official regions of England. It consists of the counties of Bristol, Cornwall (including the Isles of Scilly), Dorset, Devon, Gloucestershire, Somerset and Wiltshire. Cities and ...

and eastern Ireland. Western Scotland and northern Ireland can also see snow showers from a north or north-westerly wind over the Atlantic. Since the North Sea is relatively warm (around at the beginning of winter, typically by the end), sufficiently cold air aloft can create significant snowfalls in a relatively short period of time. The best-known example occurred in January 1987, when record-breaking cold air (associated with an upper low) moved across the North Sea towards the UK. The end result was over 2 ft of snow for coastal areas, leading to communities being cut off for over a week. The latest of these events to affect Britain's east coast occurred on November 30, 2017; February 28, 2018; and March 17, 2018; in connection with the

2018 Great Britain and Ireland cold wave Anticyclone Hartmut (dubbed the ''Beast from the East'' ( ga, An Torathar ón Oirthear)) was a storm that began on 22 February 2018, and brought a cold wave to Great Britain and Ireland. Anticyclone Hartmut also brought widespread unusually l ...

. The second event of winter 2017/18 was particularly severe, with up to falling in total over the 27th–28th. Similarly, northerly winds blowing across the relatively warm waters of the English Channel during cold spells can bring significant snowfall to the French region of Normandy, where snow drifts exceeding 10 ft (3 m) were measured in March 2013. File:Snow-chart.png, Chart showing the sea-effect snow event of January 1987 in the UK: A continuous stream of showers deposited over of snow over SE coastal regions. File:Lakeeffect.png, NetWeather radar image showing "lake-effect" snow over

Kent Kent is a county in South East England and one of the home counties. It borders Greater London to the north-west, Surrey to the west and East Sussex to the south-west, and Essex to the north across the estuary of the River Thames; it faces ...

and northeast England

References

External links

National Weather Service Official Lake Effect Page
��based in Buffalo, NY
Lake effect forecasting

Video of a snowsquall timelapse while driving on Highway 407 ETR in Greater Toronto

,

Great Lakes Environmental Research Laboratory The Great Lakes Environmental Research Laboratory (GLERL) is a laboratory in the National Oceanic and Atmospheric Administration (NOAA) Office of Oceanic and Atmospheric Research (OAR). It is headquartered in Ann Arbor, Michigan, with a subsidia ...

A BBC forecast of lake effect snow in the UK in 1991
{{Severe weather terminology (United States) navbox Climatology Snow or ice weather phenomena Upper Peninsula of Michigan fr:Bourrasque de neige#Bourrasques en aval de plans d'eau

Formation

Instability

Fetch

Wind shear

Upstream moisture

Upwind lakes

Synoptic forcing

Orography and topography

Snow and ice cover

Great Lakes region

United States

Ontario, Canada

Elsewhere in the United States

Elsewhere in Canada

Eurasia

United Kingdom

See also

References

External links