The affected areas extend from extreme eastern Iowa across northern Illinois and Indiana to extreme southeast lower Michigan and into northwest Ohio.By evening, the threats could coalesce into a phenomenon that happens only a few times a year called "derechos," a line of storms that could extend hundreds of miles and can produce damage similar to that of tornadoes."Conditions are favorable for a weather system like a derecho today in the Upper Midwest -- Illinois, Indiana, Ohio," Schneider said.A derecho is defined as having a swath of damage more than 240 miles long with gusts of at least 58 mph.
Severe weather threatening parts of Midwest - CNN.com


I hope everyone stays safe!