Timeline: Snow system moves out, lake effect moves in

Justin Greene
March 15, 2017

All Lake-effect Warnings/Advisories in northeast IL will be discontinued as of 4PM this Tuesday afternoon.

The National Weather Service in Chicago warned of heavy lake effect snow beginning before daybreak and shifting across the most of Lake, Porter and LaPorte County until 1 a.m. Wednesday.

Lake-effect snow, a relatively rare occurrence in Chicago, is providing the city with its biggest snow event of the season to date.


Could be significant amounts of snow for the morning commute. Before Monday, the last snowfall greater than an inch during this unseasonably warm winter occurred on December 17 when 1.7 inches accumulated in Chicago.

The lake-effect band that started between 7 and 8 p.m. Monday in the northern suburbs had dropped 8.5 inches in Waukegan by early Tuesday, NWS meteorologist Casey Sullivan said. But because lake-effect bands are only about 10 to 15 miles wide, snow totals can greatly vary over short distances.

The National Weather Service also issued a Lake Effect Snow Advisory for Will County in IL and La Porte County Indiana, including the cities of Michigan City and La Porte. The snow is expected to develop Tuesday evening and continue overnight into Wednesday morning. That said, plenty more snow is likely across the Chicago metro area, the Milwaukee metro area, and the Northeast United States. Why?

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