Rounds of drenching, gusty thunderstorms will continue over portions of the North Central states into midweek with some communities from the central and northern Plains to the Great Lakes and the Ohio Valley being hit with flash flooding and/or damaging winds.
During the first part of the week, the risk of severe thunderstorms will cover a broad area of the Plains and Midwest, while progressing to the east.
Update 6:00 p.m. CDT Monday: A squall line, possibly a developing derecho was moving eastward across northern and central Illinois. There is the potential for downed trees and power lines as this system moves through and into northern Indiana and southern Lower Michigan during the evening.
Rainfall can be intense enough to blind drivers and bring flash, urban and small stream flooding, in some locations. As thunderstorms approach major cities, significant ground and flight delays can result.
Strong winds from some of the storms can down trees and power lines in a few communities. A handful of neighborhoods can be hit with large hail. A very small number of the strongest storms can produce a short-lived tornado.
The nastiest storms into Monday night will fire from Kansas to South Dakota, eastward to Iowa and parts of Wisconsin and Illinois. Major cities that can be hit by more than one storm into Monday night include Chicago, Omaha, Neb., Des Moines, Iowa, Sioux Falls, S.D., and Bismarck, N.D.
During Tuesday, the main focus of the storms will reach from the Dakotas, to well beyond Wisconsin and Illinois. The nasty storms can occur over much of Michigan and a large part of Ohio and Indiana. Cities that may be hit by multiple storms Tuesday include Chicago, Detroit, Milwaukee, Minneapolis, and Fargo.
By Wednesday, severe thunderstorms and the risk for flooding will continue to settle farther to the east, but will focus from the Great Lakes to the Ohio Valley. Cities that could be hit include St. Louis, Indianapolis, Louisville, Cincinnati, Pittsburgh and Buffalo.
People spending time outdoors or on the road should keep an eye out for rapidly changing weather conditions.
Remember if you can hear thunder, you are at risk for being struck by lightning. Seek shelter indoors away from windows as storms approach. Never drive through flooded roadways, as you not only put yourself and other occupants at risk, but also your would-be rescuers.
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