Defiance Mountain 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 northernmost

Pacific Ranges The Pacific Ranges are the southernmost subdivision of the Coast Mountains portion of the Pacific Cordillera. Located entirely within British Columbia, British Columbia, Canada, they run northwest from the lower stretches of the Fraser River to B ...

of the

Coast Mountains The Coast Mountains () are a major mountain range in the Pacific Coast Ranges of western North America, extending from southwestern Yukon through the Alaska Panhandle and virtually all of the British Columbia Coast, Coast of British Columbia sout ...

British Columbia British Columbia is the westernmost Provinces and territories of Canada, province of Canada. Situated in the Pacific Northwest between the Pacific Ocean and the Rocky Mountains, the province has a diverse geography, with rugged landscapes that ...

, Canada. It is located to the south of the

Bella Coola River The Bella Coola River is a major river on the Pacific slope of the Coast Mountains in southern British Columbia. The town of Bella Coola is at its mouth on North Bentinck Arm. Bella Coola Indian Reserve No. 1 is the location of the main communi ...

between the communities of

Firvale Firvale is an unincorporated community in the Bella Coola Valley region of west central British Columbia, Canada. On the north shore of the Bella Coola River about west of the mouth of Burnt Bridge Creek, no link exists to the former centre on t ...

and

Hagensborg Hagensborg, originally named Kristiania, is a unincorporated community in the Bella Coola Valley in British Columbia, Canada. Its census population in 2021 was 273. History Augsburg Church built in 1904 in Hagensborg The Bella Coola Valley wa ...

. Nusatsum Mountain is to its northwest and Stupendous Mountain to the northeast. The peak can be seen from Highway 20. The landform's toponym was officially adopted March 13, 1947, by the

Geographical Names Board of Canada The Geographical Names Board of Canada (GNBC) is a national committee with a secretariat in Natural Resources Canada, part of the Government of Canada, which authorizes the names used and name changes on official federal government maps of Canad ...

Climate

Based on the

Köppen climate classification The Köppen climate classification divides Earth climates into five main climate groups, with each group being divided based on patterns of seasonal precipitation and temperature. The five main groups are ''A'' (tropical), ''B'' (arid), ''C'' (te ...

, Defiance Mountain 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. 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 originate in the

Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five Borders of the oceans, oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is ...

, and travel east toward the Coast Mountains where they are forced upward by the 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 snowfall. As a result, the Coast Mountains experience high precipitation, especially during the winter months in the form of snowfall. Winter temperatures can drop below −20 °C with wind chill factors below −30 °C. This climate supports a glacier in the north cirque.

References

Bella Coola Valley Pacific Ranges Two-thousanders of British Columbia Range 3 Coast Land District {{BritishColumbiaCentralCoast-geo-stub

Climate

See also

References