The National Weather Service has issed a flood watch for the following counties...
Racine, Milwaukee, Kenosha, Jefferson, Lafayette, Rock, Green, Waukesha
Including the cities of Watertown, Fort Atkinson, Jefferson, Waukesha, Brookfield, New Berlin, Menomonee Falls, Muskego, West Allis, Wauwatosa, Greenfield, Franklin, Oak Creek, South Milwaukee, Cudahy, Darlington, Shullsburg, Benton, Belmont, Argyle, Blanchardville, Monroe, Brodhead, Janesville, Beloit, Whitewater, Delavan, Elkhorn, Lake Geneva, East Troy, Racine, and Kenosha.
Through late this evening, a Flash Flood Watch is also in effect. Flash Flooding can be a very serious and dangerous situation. Do not ever drive on flooded roads that you are not sure of the depth. It only takes about 4 " of rushing water to take a grown man down; and 12" of water to move a vehicle of average size.
According to report from NWS, the potential for 1-2 inches of rain in a very short time is very possible.