Four types of chinook winds are described and features detectable in satellite pictures are shown. The hypothesis that large amplitude lee waves could be a possible driving mechanism for chinook winds is investigated for a case occurring in the Rocky Mountains during April 1963. It is shown that the stability of the surface inversion layer on the windward side of a mountain is related to the occurrence of chinook winds to the leeward side. This relationship leads to the speculation that chinook winds may undergo a quasi-diurnal fluctuation, in phase with the onset of the windward surface inversion.

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