Mount Persis is a summit located in

Snohomish County Snohomish County () is a county located in the U.S. state of Washington. With a population of 827,957 as of the 2020 census, it is the third-most populous county in Washington, after nearby King and Pierce counties, and the 72nd-most popul ...

, of

Washington Washington most commonly refers to: * George Washington (1732–1799), the first president of the United States * Washington (state), a state in the Pacific Northwest of the United States * Washington, D.C., the capital of the United States ** A ...

state. The mountain is part of the

Cascade Range The Cascade Range or Cascades is a major mountain range of western North America, extending from southern British Columbia through Washington (state), Washington and Oregon to Northern California. It includes both non-volcanic mountains, such as m ...

and is situated in the

Mount Baker-Snoqualmie National Forest Mount is often used as part of the name of specific mountains, e.g. Mount Everest. Mount or Mounts may also refer to: Places * Mount, Cornwall, a village in Warleggan parish, England * Mount, Perranzabuloe, a hamlet in Perranzabuloe parish, ...

. The mountain was named for Persis Gunn (1846–1898), wife of homesteader/miner Amos

Gunn Gunn may refer to: Places * Gunn City, Missouri, a village * Gunn, Northern Territory, outer suburb of Darwin * Gunn, Alberta, Canada, a hamlet * Gunn Valley, a mountain valley in British Columbia, Canada * Gun Lake (British Columbia), a Cana ...

who started the nearby town of

Index, Washington Index () is a town in Snohomish County, Washington, Snohomish County, Washington (state), Washington, United States. The population was 155 at the 2020 United States Census, 2020 census, making it the smallest municipality in the county. Index ...

, and also named nearby Mount Index. Precipitation runoff from the mountain drains into tributaries of the

Skykomish River The Skykomish River is a long river in the U.S. state of Washington (state), Washington which drains the west side of the Cascade Mountains in the southeast section of Snohomish County and the northeast corner of King County, Washington, K ...

Topographic relief Terrain (), alternatively relief or topographical relief, is the dimension and shape of a given surface of land. In physical geography, terrain is the lay of the land. This is usually expressed in terms of the elevation, slope, and orientati ...

is significant as the summit rises above Anderson Creek in 0.8 mile (1.3 km). The rocks of Mount Persis are volcanic in origin and are considered amongst some of the earliest expressions of volcanism in the Cascade Mountain range in Washington.

Climate

Mount Persis is located in the

marine west coast An oceanic climate, also known as a marine climate or maritime climate, is the temperate climate sub-type in Köppen classification represented as ''Cfb'', typical of west coasts in higher middle latitudes of continents, generally featuring co ...

climate zone of western North America.Beckey, Fred W. Cascade Alpine Guide, Climbing and High Routes. Seattle, WA: Mountaineers Books, 2008. Most

weather front A weather front is a boundary separating air masses for which several characteristics differ, such as air density, wind, temperature, and humidity. Disturbed and unstable weather due to these differences often arises along the boundary. For ins ...

s originating in the Pacific Ocean travel northeast toward the

Cascade Mountains The Cascade Range or Cascades is a major mountain range of western North America, extending from southern British Columbia through Washington and Oregon to Northern California. It includes both non-volcanic mountains, such as many of those in the ...

. As fronts approach the Cascades, they are forced upward by the peaks (

orographic lift Orographic lift occurs when an air mass is forced from a low elevation to a higher elevation as it moves over rising terrain. As the air mass gains altitude it quickly cools down adiabatically, which can raise the relative humidity to 100% and cr ...

), causing them to drop their moisture in the form of rain or snowfall onto the Cascades. As a result, the west side of the North Cascades experiences high precipitation, especially during the winter months in the form of snowfall. Because of maritime influence, snow tends to be wet and heavy, resulting in high

avalanche An avalanche is a rapid flow of snow down a Grade (slope), slope, such as a hill or mountain. Avalanches can be triggered spontaneously, by factors such as increased precipitation or snowpack weakening, or by external means such as humans, othe ...

danger. During winter months, weather is usually cloudy, but, due to high pressure systems over the Pacific Ocean that intensify during summer months, there is often little or no cloud cover during the summer. Due to its temperate climate and proximity to the Pacific Ocean, areas west of the Cascade Crest very rarely experience temperatures below or above .

Gallery

File:Mt Index and Mt Persis.jpg, Mount Index (left) and Mount Persis (right)

References

External links

* Mount Persis weather
Mountain Forecast
{{DEFAULTSORT:Persis North Cascades of Washington (state) Mountains of Snohomish County, Washington Mount Baker-Snoqualmie National Forest One-thousanders of the United States

Climate

Gallery

See also

References

External links