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  • Tim McGill

A Few Strong Storms Possible Late Today & Tonight

It wasn't an exceptionally hot day yesterday as O'Hare's high reached 87° but it was the 26th day in a row with temperatures at or above average. 33 of the last 35 days have been above average. July is now about 5.7° above average. Today's highs should be near or just a bit above average topping out in the middle 80s but cooler lakeside.

The Storm Prediction Center has placed us in an area with a marginal risk for severe weather. "Marginal" is the lowest risk level of 5 risk levels and means "an area of severe storms of either limited organization and longevity, or very low coverage and marginal intensity."

The greatest risk with these storms would be damaging winds and large hail. There could be a few spots that see some torrential rains too. The window for these storms to fire up would be late today into early tonight (4pm-10pm). There is a low risk of a tornado spinning up. The greatest chance for that to occur is in southeastern Minnesota, northeastern Iowa and Western Wisconsin.

There were a few funnel clouds spotted on Monday south of the city. Here is a shot taken by Logan Bundy of a landspout and funnel cloud just north of Streator. There were several "cold air funnels" seen in areas south and southwest of Chicago.

Logan Bundy Photo Near Streator

Here is some video of a funnel cloud shot in Ottawa by Tim Creedon Monday afternoon.

While the heat will be of a more seasonable variety through Thursday there are indications of another surge of higher heat and humidity could hit this weekend. The GFS meteogram shows temperatures climbing into the lower to middle 90s Saturday and Sunday with dew points well into the 70s. That would mean heat index values over 100° not only this weekend but Monday too. After thunderstorms later today and tonight the model keeps us dry until early next week.

No signs of this unusually hot summer cooling off through at least early August. The 6-10 and 8-14 day temperature probability forecasts keep the Chicago area favored for above average temperatures overall from July 28th through August 3rd.

Here is my 7 day forecast:

Today: Mostly cloudy, sct. showers/t-storms mainly late High: 84 (78 Lakefront))

Wednesday: Partly to mostly sunny, hit or miss shower/t-storm possible Low: 72 High: 86

Thursday: Partly to mostly sunny Low: 70 High: 86 (79 Lakefront)

Friday: Partly cloudy, hit or miss shower/t-storm possible Low: 70 High: 89 (82 Lakefront)

Saturday: Partly to mostly sunny, hot & humid Low: 74 High: 92

Sunday: Partly to mostly sunny, hot & humid Low: 75 High: 93

Monday: Partly to mostly sunny, sct. showers & t-storms Low: 75 High: 93



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