Mountain Weather
Foehn Winds Explained: Downslope Warming Around the World
What foehn winds are, why they warm and dry air, and how they affect mountain communities, fire danger, avalanches, and comfort.
Quick answer: Foehn winds are warm, dry downslope winds that occur in many mountain regions around the world.
How they form
Air forced over mountains changes temperature and moisture as it rises and descends.
On the lee side, sinking air compresses and warms, often becoming drier.
Common impacts
Foehn winds can raise temperatures, lower humidity, increase fire danger, and affect snowpack.
Strong gusts can also create travel and power issues.
Local names
Different regions use different names for similar downslope wind patterns.
The local terrain and pressure setup control how strong the wind becomes.