The National Weather Service has issued a flash flood warning for northern Grant, southern Crawford and southern Richland counties until 2 a.m.
At 10:57 p.m., National Weather Service Doppler radar detected a slow-moving thunderstorm with rainfalls of 1.25 inches within 25 minutes.
Cities in the warning area include Prairie du Chien, Bloomington, Boscobel, Fennimore and Muscoda.
A flash flood watch is in effect for Grant, Crawford and Richland counties until 10 a.m.