A moist atmosphere and a slow moving area of low pressure brought numerous showers and isolated thunderstorms to southern Wisconsin on Wednesday and Wednesday night. Some of the showers were slow moving and deposited heavy rainfall on portions of southern Wisconsin.
The below graphic illustrates the rainfall that occurred on Wednesday and Wednesday night, through 7 am Thursday morning:
Expanding our view, here is the 24 hour rainfall that occurred across all of Wisconsin, ending 7 am Thursday morning:
The heaviest rainfall occurred in parts of Dodge, Washington, Ozaukee, Fond du Lac and Sheboygan counties where many locations received between 1 and 2 inches of rain. Several of our cooperative observers reported over two inches of rain in the past 24 hours including 3SW Oak Grove /2.46"/ and Mayville /2.04"/ in Dodge county. Our observer 5NE Ripon in Fond du Lac county reported 1.95 inches.
The complete list of 24 hour rainfall is available here.
National Weather Service - Milwaukee/Sullivan