Temperatures dropped 15 degrees almost immediately as a cold front passed through the area Sunday morning. In the afternoon, the front stalled after moving well south of Interstate 80, leaving a huge 30-degree-plus temperature differential across northeast Illinois from the upper 40s along the Lake Michigan shoreline to the lower 80s to the southwest in Grundy County.
The frontal boundary so perfectly depicted in the satellite photo displayed on this page is expected to move back north as a warm front today, reversing yesterday’s cool down with a similar warm-up—by mid afternoon much of the city may well make up Sunday’s 30-degree differential with readings reaching 80° to the south and west and the mid to upper 70s north. Conditions should become more humid the next couple days as 80° warmth continues over northeast Illinois. Clouds thicken Wednesday with a good chance of thunderstorms that night ahead of a cold front.
--By Paul Dailey, WGN Weather Center Meteorologist
WGN-TV Chief Meteorologist Tom Skilling and the WGN Weather Center staff provide daily coverage of weather in the Chicago area.
