Why does the lake-effect snow stop once the Great Lakes freeze over?

Due to its relatively shallow depths, Lake Erie has the distinction of being the only Great Lake capable of completely freezing over. As it freezes throughout the winter, and the supply of moisture from the lake surface is cut off, lake-effect snow events cease.



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Lake-effect snow generally doesn't fall over the water because it needs the friction and topography of the land to bring out the snow. Winds usually blow west to east in the Northern Hemisphere, so the lake-enhanced snow is pushed to the eastern side of the Great Lakes, Miller said.

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Lake Ontario and Lake Erie Snowbelts The region east and southeast of Lake Ontario frequently sees daily snowfall totals that are higher than anywhere in the United States. Syracuse, New York, receives significant lake-effect snow from Lake Ontario, averaging 116 inches (294 cm) of snow per year.

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Lake Superior has the greatest impact on local snowfall amounts with 100% more winter precipitation falling downwind compared to Lakes Erie and Ontario that only have precipitation increases of 15% from the lake-effects.

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Lake Michigan Snowbelt Western Michigan, Northwestern Lower Michigan, and Northern Indiana can experience heavy lake-effect snow.

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When the Great Lakes freeze over, what happens to lake effect snow? It ceases.

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Anywhere! Lake effect snow can occur over any unfrozen body of water where the fetch is long enough to gather enough moisture to create snow. Lake effect snow can occur over Lake Tahoe, the Great Salt Lake, the finger lakes, and even has been reported over rivers in the Midwest!

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Places near the shoreline can receive lake-effect snow, but because the state lies north and west of the lake, snowfall amounts are not nearly as large as they are in locations like Wisconsin and Michigan that lie downwind to the south. Even so, the single largest snowstorm in Minnesota history was a lake effect event.

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Lake-effect snow can form on small lakes just as it does in the Great Lakes. Salt Lake City, Fort Worth and Carson City, Nevada have all had bouts of snow from lakes. Inland lake-effect and ocean-effect doesn't just occur in the United States.

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Lake Effect Snow (LES) is very common across the Great Lakes region during the late fall and winter. LES occurs when cold air, often originating from Canada, moves across the open waters of the Great Lakes.

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