What is the name of the cold and dry wind that blows at night from the Jura Mountains towards Lake Geneva in Europe?
The Joran is a cold, dry wind that blows from the Jura Mountains in Switzerland. It is a type of “mountain breeze” that occurs when the air on the slopes cools down at night and becomes heavy. This cold air then slides down the mountainside toward the lower-pressure area over Lake Geneva, creating a sudden and chilly nighttime wind. ANSWER: (B) Joran
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The Joran is a fascinating example of a “katabatic” or gravity-driven wind. During the night, the air at high altitudes in the Jura Mountains loses heat quickly. Because cold air is denser and heavier than warm air, it begins to flow downward like water, following the valleys and slopes toward Lake Geneva. This wind is very important for sailors and people living near the lake, as it can arrive very suddenly. It shows how even small mountain ranges can create their own local wind systems that affect the temperature and safety of the surrounding lowland areas.
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