WGN-TV Chief Meteorologist Tom Skilling and the WGN Weather Center staff provide daily coverage of weather in the Chicago area.

Mild start, but very cold for the rest of the week

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There will be one more opportunity for thunderstorms Monday night and Tuesday in advance of a strong cold front—and then the doors to extremely cold air directly from the arctic will be opened. Projected atmospheric dynamics point to the possibility of severe storm development Tuesday.
Residents of Carol Stream in DuPage County—where a violent microburst Saturday night injured 11 people when it tore the roof off a three-story apartment building, battered several other nearby structures, and downed trees—will certainly be on the alert for this next weather system. Mild temperatures today will continue into tonight and probably up to noon Tuesday before cold air feeds into northeast Illinois. From that point on, readings will struggle to reach 40°, perhaps hovering in the 30s through Easter weekend.
Over the rest of the nation Sunday, only a few reports of hail and wind damage occurred in northeast Ohio, western Pennsylvania and West Virginia.
--By Paul Dailey, WGN Weather Center Meteorologist