As a center of low pressure moves northeast across Wisconsin and the associated cold front crosses the Mississippi River headed east, at 6AM CST a band of rain covers a good portion of Illinois, Wisconsin, Indiana and Michigan. Southerly winds have been gusting between 25 and 30 miles per hour and temperatures have held in the middle 50s overnight in advance of the cold front. Behind the cold front, winds have shifted to the north-northwest and temperatures have quickly dropped off into the 40s and 30s across Iowa, Minnesota and northwestern Wisconsin.
The Chicago National Weather Service Forecast office has issued an Urban and Small Stream Flood Advisory for Cook and Will Counties in Illinois and northwestern Lake County in Indiana until 8:30AM CDT this morning. Weather radar has indicated over a half inch of rain has fallen at some locations with another half-inch possible this morning. Some ponding of water on roadways, viaducts, underpasses and low-lying areas could occur.
The cold front should pass through the Chicago area shortly before and after noon with rain ending early shortly after the frontal passage. Temperatures will fall out of the 50s into the 40s within an hour of the cold front passing a given location – eventually dropping into the 30s across the entire Chicago area by mid and late afternoon.
Some rainfall reports around 6AM CDT
Location Rainfall (inches)
West Chicago .41
Valparaiso, IN .14