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  • Tim McGill

Heat Peaks On Wednesday But Cooler Pattern Kicks In This Weekend

Monday's high of 97° at O'Hare was not only the hottest day of the year so far but it was also the hottest day in nearly two years. The last time we were that hot was on August 4th, 2018. Debris clouds from storms that fired overnight and lingered this morning will cut down the heating a bit today but it will still be steamy. The "ring of fire" pattern spawned some strong storms overnight in southern Wisconsin that slipped south into northern Illinois.

So today's highs won't be as hot as Monday but still well above the average high of 81°. Highs should reach into the lower 90s away from the lakefront but only lower 80s lakeside.

The heat should peak on Wednesday with highs in the upper 90s followed by middle 90s on Thursday. Cooler air is coming this weekend. Sunday's highs might not get out of the 70s. The temperature anomaly forecast for Sunday has a blob of blue centered over the midwest suggesting highs will be about 5 to 10 degrees cooler than average.

So look for highs Sunday only in the middle middle to upper 70s. The GFS forecast temperatures for Sunday afternoon even has some 60s north and northwest of Chicago.

Once the cooler air arrives it could hang around for a few days. The longer range temperature probability forecasts have us outlooked for below average temperatures overall from August 30th through September 7th.

While some of us got some much needed rainfall with the thunderstorms early today most of the area is still very dry. The next good chance for a more widespread threat of rain here isn't until late Friday into early Saturday.

The longer range precipitation probability forecasts though continue to offer hope for a return to a wet pattern for the start of September. This could help prevent portions of northern Illinois from slipping into a moderate drought. Both the 6-10 and 8-14 day forecasts have us outlooked for above average precipitation from August 30th through September 7th. We are still down a little over 3 inches of rain compared to average so far this month.

Here is my 7 day forecast: Today: A.M. sct shwrs/t-strms mainly north then partly cloudy High: 93 (82 Lakefront) Wednesday: Mostly sunny Low: 72 High: 97 (That would tie record high set in 1973) Thursday: Partly/mostly sunny, sct. t-storm late? Low: 76 High: 96 Friday: Partly cloudy, sct. showers & thunderstorms Low: 74 High: 88

Saturday: Partly to mostly sunny Low: 68 High: 80 (75 Lakefront) Sunday: Mostly sunny Low: 62 High: 78 (74 Lakefront) Monday: Partly to mostly cloudy, sct. showers/thunderstorms Low: 60 High: 79 #ilwx


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