Mountain Weather
Upslope Snow Explained: Why Wind Against Terrain Makes Snow Heavier
How upslope flow creates clouds and snow, why mountains and foothills can get enhanced precipitation, and why wind direction matters.
Quick answer: Upslope snow happens when wind pushes moist air up terrain, cooling it and helping clouds and snow form.
Terrain lift
Air forced uphill expands and cools. If enough moisture is present, clouds and precipitation can develop or intensify.
The favored slopes depend on wind direction.
Local gradients
One side of a mountain range can get heavy snow while nearby areas get much less.
Foothills can also see enhanced snowfall when low-level flow is aimed into terrain.
Forecasting challenge
Small wind direction or moisture changes can shift the heaviest snow.
Mountain travel forecasts should be checked closely because conditions change with elevation.