GARY HINCKS / SCIENCE PHOTO LIBRARY GARY HINCKS / SCIENCE PHOTO LIBRARY
Foehn wind. Computer artwork of a foehn wind warming the leeward side of a mountain range. These winds occur due to the moist air cooling on the windward side at a slower rate than the dry air is heated on the leeward side. This is because water condenses as air rises, releasing latent heat that slows the rate of cooling. The wind heats up so much as it decends on the leeward side, it can raise the surrounding temperature by up to 30 degrees celsius in just a few hours. For this image without the arrows, see image E500/0155.
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