Wednesday, September 19, 2018

Thunderstorm Chances Increase Late Wednesday Night - Flooding Rainfall Possible for Some in the Midwest

Flash Flood Watches have been issued for parts of Wisconsin, Minnesota and Iowa in anticipation of heavy rainfall late Wednesday night and early Thursday morning.  Thunderstorms have already started to develop over northern Iowa this evening and will only grow in coverage during the night.

The storms are forming ahead of a warm front that will move through the Stateline early
Thursday morning.  Stronger thunderstorms are possible over Iowa and Wisconsin, but some storms locally could produce hail - especially with any of the storms that develop after Midnight.  A Marginal Risk for strong thunderstorms does exist for parts of the Plains, Iowa, Minnesota, southern Wisconsin and northern Illinois. 

Continuous thunderstorms along the warm front
overnight could allow for nearly two to four inches of rain to fall where the Flash Flood Watches have been issued.  Closer to home another half an inch, up to an inch, of rain could fall through Thursday morning.


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