Overnight showers and thunderstorms should gradually diminish during the morning hours. As the storms moved out of Iowa and NW Illinois, some “trained” (repeatedly passed over the same area) resulting in localized flooding where rainfall totaled well over an inch. The storm-triggering warm front is expected to move north of Chicago this afternoon, and as it does, clouds will break and winds shift to the south. The front should lie just to the north, orienting west-east across southern Wisconsin, the first half of the week.
Chicago will thus be situated on the northern edge of a hot, humid air mass centered over southern Missouri and Arkansas. An Extreme Heat Warning is in effect today and an Extreme Heat Watch for the remainder of the workweek in the St. Louis area. Meanwhile, Chicago will experience daily flirtations with 100° afternoon heat indices.
--By Paul Dailey, WGN Weather Center Meteorologist
WGN-TV Chief Meteorologist Tom Skilling and the WGN Weather Center staff provide daily coverage of weather in the Chicago area.
