At what point does lake-effect snow stop occurring?
Luckily for people living near large lakes, lake effect snow generally slows down around February. That's when the lakes freeze over, making it impossible for the air to steal moisture away from the lake.
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Lake effect snow is common across the Great Lakes region during the late fall and winter. Lake Effect snow occurs when cold air, often originating from Canada, moves across the open waters of the Great Lakes.
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.
The water molecules in these clouds freeze and are eventually deposited downwind, on the leeward side of these lakes as snow and other types of winter precipitation. Lake effect snow occurrence and location is mainly dependent on wind (speed and direction) and topography.
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!
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.
If you are getting 50-55 degrees Fahrenheit, turnover may be nearing or just starting. By 45-50 degrees Fahrenheit the lake is making the change rapidly, and fall turnover is complete at around 40.
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.
As a general rule of thumb, ice is safe to walk on when there is 4 inches or more of clear ice. It is important to understand that different types of ice varying in their strength. Clear blue or black ice is the strongest. This ice is formed from the lake water freezing.
Before a lake can freeze over, its entire water column from top to bottom, must reach that magic temperature (39.2° F or 4° C). This natural cooling process is called fall overturn. It is a gradual process as the surface water slowly cools down and a larger and large layer of water can be mixed by the wind.
That doesn't mean, however, when the air temp reaches 32 the lakes freeze. Water is a great insulator and good at holding heat, which is why the lake temperature doesn't fluctuate much day to day like the air does. Therefore, below freezing temperatures are needed for a week or more to form ice on a large lake.