A Flash Flood Watch has been issued for Winnebago, Boone, McHenry, Ogle, Lee, DeKalb and Whiteside counties this evening. Storms that developed late Tuesday night and early Wednesday morning produced quite a bit of rainfall. Highest rain amounts were seen over northeast Illinois, southeast Wisconsin and far northeast Iowa.
An incoming cold front has caused thunderstorms to develop from Wisconsin, back down through central Iowa. These storms are moving east and will eventually turn southeast towards southern Wisconsin by sunset. Rainfall rates in some of the stronger thunderstorms could be near one inch per hour.
More on the heavy rain threat coming in a later post.