Powerful storms fire up when that air rushes north and clashes with cold air slicing south from Canada. This happens most often in an area from the Plains to just west of the Appalachians.

Monday is a Weather Impact day due to the risk for severe storms by the afternoon and evening hours.

Greater Cincinnati was thrashed by severe weather Wednesday night and into the early morning hours Thursday, but emerged largely unscathed compared with the deadly storms that swept across the ...