weatherch12 - ATOC 1050 Chapter 12 Lake effect snowstorms...

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ATOC 1050 Chapter 12 Lake effect snowstorms Occur when cold air moves across the large bodies of water. The colder the air and the warmer the lake surface, the more intense the lake snows will be. The development of a lake-effect snowstorm: These storms typically have temperatures ranging from about -5 degrees C to about -25 degrees C. Usually they occur after an extratropical cyclone has passed over the lakes from the north or northwest and the cold air remaining behind the cold front passes over the lake. This wind speeds up as it encounters less friction over water than on land and the warm water on the lake heats up the air moving over it. This raises its evaporation pressure of the air and water evaporates off the lake. This causes the air right above the surface to be warmer than the air above that and triggers instability. Once the air reaches land it is slowed down and convergence occurs because the presence of more friction all of the sudden.
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