Foss Peak is a

summit A summit is a point on a surface that is higher in elevation than all points immediately adjacent to it. The topographic terms acme, apex, peak (mountain peak), and zenith are synonymous. The term (mountain top) is generally used only for ...

in the

Tatoosh Range The Tatoosh Range is a mountain range located in Mount Rainier National Park and the adjacent Tatoosh Wilderness in the state of Washington (state), Washington, in the Pacific Northwest region of the United States.Mandrake"Tatoosh Range."SummitPo ...

which is a sub-range 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 ...

. It is located south of

Mount Rainier Mount Rainier ( ), also known as Tahoma, is a large active stratovolcano in the Cascade Range of the Pacific Northwest in the United States. The mountain is located in Mount Rainier National Park about south-southeast of Seattle. With an off ...

within

Mount Rainier National Park Mount Rainier National Park is a List of national parks of the United States, national park of the United States located in southeast Pierce County, Washington, Pierce County and northeast Lewis County, Washington, Lewis County in Washington (sta ...

, in Lewis County 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 peak is named for Thea Foss (1857–1927), who founded the

Foss Maritime Foss Maritime (formerly Foss Launch and Tug Company), is an American tugging company. The company was founded in 1889 by Thea Foss (1857–1927) and her husband Andrew Foss. The company is now the largest tug and towing concern on the west coas ...

Company with her husband in 1889. The peak also has an alternate name, ''Manatee Mountain''. The nearest higher neighbor is West Unicorn Peak, to the southeast. Precipitation runoff from the mountain drains into tributaries of the

Cowlitz River The Cowlitz River is a river in the state of Washington in the United States, a tributary of the Columbia River. Its tributaries drain a large region including the slopes of Mount Rainier, Mount Adams, and Mount St. Helens. The Cowlitz has a ...

Climate

Foss Peak 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, they are forced upward by the peaks of the Cascade Range (

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 snow onto the Cascades. As a result, the west side of the 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

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.

Gallery

File:Unicorn and Foss.jpg, Unicorn Peak (left) and Foss Peak (right) in winter File:Foss Peak aka Manatee Mountain.jpg, Foss Peak (aka Manatee Mountain) File:Unicorn Peak 8421s.JPG,

Unicorn Peak Unicorn Peak is a mountain summit in Lewis County of Washington state, United States. It is the highest point in the Tatoosh Range which is a sub-range of the Cascade Range. It is located in Mount Rainier National Park, south of Mount Rainie ...

(left), West Unicorn Peak, and Foss Peak (right) File:Louise Lake, Foss Peak, Unicorn Peak.jpg, Louise Lake, Foss Peak, and Unicorn Peak. File:Foss Peak.jpg, North-northeast aspect of Foss Peak

References

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External links

* National Park Service web site
Mount Rainier National Park
Cascade Range Mountains of Lewis County, Washington Mountains of Washington (state) One-thousanders of the United States Mount Rainier National Park