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Chinook winds /ʃɪˈnʊk/, or simply Chinooks, are föhn winds[1] in the interior West of North America, where the Canadian Prairies and Great Plains meet various mountain ranges, although the original usage is in reference to wet, warm coastal winds in the Pacific Northwest.[2]

Chinook is claimed[by whom?] by popular folk-etymology to mean 'ice-eater', however it is the name of the people in the region where the usage was first derived.[citation needed] The reference to a wind or weather system, simply 'a Chinook', originally meant[by whom?] a warming wind from the ocean into the interior regions of the Pacific Northwest of the USA (the Chinook people lived near the ocean, along the lower Columbia River).

A strong föhn wind can make snow one foot (30 cm) deep almost vanish in one day[citation needed]. The snow partly melts and partly sublimates[3] in the dry wind. Chinook winds have been observed to raise winter temperature, often from below −20 °C (−4 °F) to as high as 10–20 °C (50–68 °F) for a few hours or days, then temperatures plummet to their base levels. The greatest recorded temperature change in 24 hours was caused by Chinook winds on 15 January 1972, in Loma, Montana.

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