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Arctic air could bring heavy lake-effect snow

By Meteorologist Paul Dailey

Late Thursday, the National Weather Service put portions of the Chicago area under a lake-effect snow watch for Friday afternoon and night. As the southern edge of an arctic high pressure air mass slides southward across the Chicago area Friday, winds out of the north will gust more than 35 mph, and temperatures will fall steadily through the 20s, creating afternoon wind chills in the teens to single digits. As the chilly air just above the surface glides over the relatively warm, 35-degree waters of Lake Michigan, extremely unstable low-level atmospheric conditions will enable the rapid development of snow showers, with the most intense of these being along the shore and just inland from Chicago south into northwest Indiana. Portions of Cook and Will counties closest to the lake could receive 3 to 7 inches of snow while 5 to 8 inches could fall in portions of Lake and Porter counties in Indiana.

Snow should end from west to east Saturday, and Chicagoans could possible experience the second-coldest day of the winter. Temperatures modify early next week with the next chance of snow coming later Monday.

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