Chinook(redirected from Upper Chinook)
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Chinook, indigenous people of North America
chinook, warm, dry air mass
a southwesterly foehn that blows on the eastern slopes of the Rocky Mountains in Canada and the USA and on the adjacent parts of the prairie. The chinook is accompanied by a very sudden, sharp increase in air temperature of as much as 20° to 30°C, which facilitates increased melting of snow, faster ripening of fruit, and so on. The chinook is observed year-round but is especially frequent in the winter. The term “chinook” is also applied to the moist southwesterly wind that blows from the Pacific Ocean along the western coast of the USA.