Foehn wind
a warm, dry, downslope wind descending the lee side of the Alps as a result of synoptic-scale, cross-barrier flow over the mountain range
A Foehn, or Föhn (German pronunciation: [føːn]; UK: , US: fayn, US also fu(r)n), is a type of dry, relatively warm downslope wind in the lee of a mountain range. It is a rain shadow wind that results from the subsequent adiabatic warming of air that has dropped most of its moisture on windward slopes (see orographic lift). As a consequence of the different adiabatic lapse rates of moist and dry air, the air on the leeward slopes becomes warmer than equivalent elevations on the windward slopes.
Foehn winds can raise temperatures by as much as 14 °C (25 °F) in just a matter of hours. Switzerland, southern Germany, and Austria have a warmer climate due to the Foehn, as moist winds off the Mediterranean Sea blow over the Alps.
Etymology
The name Foehn (German: Föhn, pronounced [ˈføːn]) 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 Romansh: favuogn or just fuogn, the term was adopted as Old High German: phōnno. In the Southern Alps, the phenomenon is known as Föhn but also Italian: favonio and fen in Serbo-Croatian and Slovene. The German word Föhn (pronounced the same way) also means 'hairdryer', while the word Fön is a genericized trademark today owned by AEG. The form phon is used in French-speaking parts of Switzerland as well as in Northern Italy.
The name Föhn was originally used to refer to the south wind which blows during the winter months and brings thaw conditions to the northern side of the Alps.
The public source identifies “Foehn wind” as a warm, dry, downslope wind descending the lee side of the Alps as a result of synoptic-scale, cross-barrier flow over the mountain range. This brief keeps that definition visible, then builds a research path around Foehn, wind and warm.
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Place names and jurisdictional language are key evidence: both can reveal earlier catalogue descriptions and overlooked record series. The source revision retrieved here is dated Sep 14, 2026. The linked authority identifier is Q12314. The Library of Congress control number is sh85049627. None of the 1 selected statements returned an explicit reference.
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This entry incorporates text from “Foehn wind” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.