The warm air that provided 80-degree highs on Saturday will be departing our area Sunday. Even though this has been a long cold period dating back to last fall, we are ahead of last year on the 80-degree front. Last year our first official 80-degree high didn’t occur until the last day of April.
A cold front will slowly settle southeast through the Chicago area Sunday with a good chance of showers and thunderstorms. Ahead of the front (to the south and east) winds will be south to southwesterly with temperatures in the 70s, while behind the front (to the north) the winds will be north to northeast and temperatures in the upper 40s to middle 50s.
Heavy rains are likely Sunday night into Monday, as cold air rides northeast winds into northeast Illinois and northwest Indiana. Indications are that Monday will be a damp chilly day with occasional rain, possibly even mixed with some wet snow at times. Storm total rainfall could end up exceeding two to three inches at many locations in the Chicago area – especially to the north. Precipitation will be slow to end – probably continuing off and on Monday night, before ending early Tuesday.