Temperatures Monday afternoon felt more like late September rather than late August as highs struggled to make it out of the 60s. Rockford reached a high of 70 Monday afternoon, 11 degrees below average.
As clouds clear out through the night temperatures will continue to fall on either side of 50 degrees. It'll be a chilly start Tuesday, but similar to Monday afternoon temperatures will warm into the upper 60s and low 70s, with a forecast high of 72. The cooler air aloft combined with the sunshine early on will help create an environment for cumulus clouds to quickly develop by mid to late morning. This, at times, may cause our skies to turn mostly cloudy. Given the limited amount of moisture in the atmosphere precipitation is not expected, but a few sprinkles can't be ruled out.
Winds will turn to the southwest and west Wednesday afternoon pulling in a little more moisture ahead of a cold front. This front will pass through the Stateline early Thursday morning. As it does a few scattered showers - and perhaps an isolated rumble of thunder or two - will be possible during that time. Rainfall will remain light, adding up to only a few tenths of an inch. Winds will turn to the north, then northeast, Thursday night and Friday. This will be accompanied by another upper-level trough and renewed push of cooler air.
A blocking ridge of high pressure over Canada will slowly begin to break down heading into Labor Day weekend, but how fast the ridge breaks down will determine how fast temperatures will warm. High temperatures will warm back closer to average into the upper 70s.
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