Parts of our viewing area, especially near and east of the Mississippi River picked up anywhere from 2" to 4.5" of rain overnight and early this morning. This led to flash flooding in spots, including water over roads, creeks and streams out of their banks and a few mudslides.
Unfortunately more showers and t-storms are likely later Wednesday and into the night and heavy rain will again be possible. Another several inches could fall in some areas. This could quickly lead to more flash flooding, especially in areas that saw heavy rain last night. The ground is already very wet and saturated, in fact over 14" of rain has fallen in La Crosse since August 1st. The ground just can't take any more water and much of it will run off and cause flooding.
Also, rivers in the area need to be monitored closely for rising water levels and flooding over the next several days. The Black, Trempealeau, Root, South Branch of the Root and Kickapoo Rivers could all see minor to moderate flooding. Smaller creeks and streams also need to be watched closely for rapidly rising water levels.
This has the potential to be a dangerous flooding event that could damage roads and property. Never drive through flooded roads as vehicle deaths is the top flash flooding killer.
On top of the flooding threat, some of the storms later Wednesday afternoon into the night could be strong to severe. Large hail and strong winds will be the primary threat, but isolated tornadoes cannot be fully ruled out.