Foehn wind Labeling for preparations of aspirin combined with caffeine, codeine and the like will sometimes include "Föhnkrankheit" amongst the indications. Evidence for effects from Chinook winds remain anecdotal. The name "Foehn" (, ) arose in the Alpine region. Originating from Latin "(ventus) favonius", a mild west wind of which Favonius was the Roman personification and probably transmitted by or just "fuogn", the term was adopted as . In the Southern Alps, the phenomenon is known as föhn but also and fen in Croatian and Slovene. The German word "Fön" (without the "H", but pronounced the same way), a genericized trademark, also
Foehn wind it expands and cools due to the decrease in pressure with height. Since colder air can hold less water vapour, moisture condenses to form clouds and precipitates as rain or snow above the mountain's upwind slopes. The change of state from vapour to liquid water is accompanied by heating, and the subsequent removal of moisture as precipitation renders this heat gain irreversible, leading to the warm, dry foehn conditions in the mountain's lee. This mechanism has become a popular textbook example of atmospheric thermodynamics and it lends itself to attractive diagrams. However the common occurrence of 'dry' foehn events, where