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HIGH: 34

LOW: 25

* Winter-storm warning for north half of metro area.

* Wet snow, heavy at times, with possible thunder roughly north of Interstate 88. Rain/snow mix in areas just to the south. Mix becomes all snow at night.

* Heaviest snow in Lake, McHenry and Boone counties and north.

* Rain or t-storms in southern sections.

– – –

MARCH 21 TEMPS

FORECAST

HIGH: 34

LOW: 25

RECORD

HIGH: 77 (1938)

LOW: 9 (1888)

NORMAL

HIGH: 48

LOW: 30

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Weather Report is prepared by the WGN-TV Weather Center, where Tom Skilling is chief meteorologist. His forecasts can be seen Monday through Friday on WGN News at noon and 9 p.m.

WGN-TV meteorologists Steve Kahn, Richard Koeneman and Paul Dailey plus weather producer Bill Snyder contribute to this page.

IN THE WEB EDITION: For updated weather news, forecasts by ZIP code and local radar images, go to chicagotribune/weather or wgntv.com