Slight risk of severe thunderstorms tonight into Thursday across Chicago area

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Data pix.

The National Storm Prediction Center has most of the Chicago area (northeast Illinois-northwest Indiana) under a slight risk of severe thunderstorms ( yellow-shaded area on the highlighted maps depicting a 15% chance of severe storms within 25 miles of a given location) during the next 24 to 48 hours.

The best chance of severe storms accompanied by strong winds, large hail, vivid lightning and heavy downpours here looks to be later Wednesday night and Thursday morning and again Thursday afternoon/night. Note the greatest risk of severe storms/tornadoes lies to our west in portions of Iowa and Missouri.

At the same time, the National Weather Prediction Center has the Chicago area in a Marginal to Slight risk of Excessive Rainfall (see maps below with over an inch of rain expected to occur in multiple stronger storms (mainly tonight and Thursday-Thursday night in our Chicago area.

A cold front will move slowly east out of Iowa across northern Illinois, preceded by warm moist low-level south to southwesterly flow accompanied by strong impulses in the jet stream winds aloft supporting destabilization of the atmosphere during the next 24 to 48 hours. The cold front and upper-level support will move east of our area with precipitation/storms ending from the west early Friday.

Severe storm out look for Thursday-Thursday night...

Excessive Rainfall Outlook for Wednesday-Wednesday night...

Day 1 Excessive Rainfall Forecast

Excessive Rainfall Outlook for Thursday-Thursday night...

Day 2 Excessive Rainfall Forecast

 

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