Abstract
Some important European and American foehn research is reviewed briefly. A single winter chinook situation is analyzed in some detail using surface and upper-air synoptic data. Surface chinook winds in Montana are traced back westward and found over the Great Basin area in the middle troposphere. Qualitative evidence is found of ascent in the middle and upper troposphere above the descending foehn current. High- and low-level chinooks are differentiated, and the properties of chinook air are discussed.

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