Skilling: Severe weather possible Tuesday
Chicago saw 2013′s 31st day at or above 80 degrees Monday.
Afternoon highs reached 86 at O’Hare, 87 Midway and 84 Chicago’s lakefront.
Big thunderstorms threaten downpours in 40-50% of metro area tonight and periods of drenching rains, possibly severe weather Tuesday into Tuesday night.
Cooler, less humid conditions arrive Thursday and Friday, with heat building back in over the weekend as the annual Race to Mackinac gets underway.