The Foehn wind is a warm, dry wind that occurs on the leeward side of mountain ranges. It forms when moist air rises over the mountains, cools, and loses moisture as precipitation. As the air descends on the other side, it warms up, leading to a significant temperature increase. This phenomenon is commonly observed in regions like the Alps and the Rocky Mountains. The Foehn wind can cause rapid changes in weather, often resulting in clear skies and higher temperatures, which can impact local ecosystems and agriculture.