Dewey Peak is a summit located on the shared border of

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 ...

and

William O. Douglas Wilderness The William O. Douglas Wilderness is a designated wilderness in Central Washington. It includes located between the U.S. Route 12 and State Route 410 and is jointly administered by the Okanogan-Wenatchee National Forest and the Gifford P ...

. It is also on the shared border of Pierce County and

Yakima County Yakima County is a County (United States), county in the U.S. state of Washington (state), Washington. As of the 2020 United States census, 2020 census, its population was 256,728. The county seat and most populous city is Yakima, Washington, Ya ...

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. Dewey Peak is situated on the crest 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 ...

southeast of

Chinook Pass Chinook Pass (elevation 5430 ft./1656 m.) is a pass through the Cascade Range in the state of Washington. The pass is located on the crest of the Cascade Range, along a ridge between Yakima Peak to the northwest of the pass, and Naches Pe ...

, east of Seymour Peak, and northeast of Shriner Peak. The nearest higher peak is

Chinook Peak Chinook Peak is a summit located on the eastern border of Mount Rainier National Park. It is also on the shared border of Pierce County, Washington, Pierce County and Yakima County, Washington, Yakima County in Washington (U.S. state), Washing ...

, to the north. Dewey Peak is named in association with Dewey Lake which is set below its north aspect. Precipitation runoff from Dewey Peak 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 ...

and

Yakima River The Yakima River is a tributary of the Columbia River in south central and eastern Washington state, named for the indigenous Yakama people. Lewis and Clark mention in their journals that the Chin-nâm pam (or the Lower Snake River Chamnapam N ...

Climate

Dewey 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 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.

References

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Gallery

File:MRNP — Seymour Peak.jpg, Dewey Peak seen from northwest File:Dewey Peak.jpg, Dewey Peak seen from Naches Peak Loop Trail

External links

* National Park Service web site
Mount Rainier National Park
* National Forest Service web site
William O Douglas Wilderness
Cascade Range Mountains of Pierce County, Washington Mountains of Washington (state) Mountains of Yakima County, Washington Two-thousanders of the United States