Risk of severe thunderstorms with damaging winds and large hail and localized flooding area-wide Wednesday/Wednesday night

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated.

The National Storm Prediction Center has the Chicago area positioned in the center of a Slight Risk of Severe thunderstorms that includes all of Wisconsin, most of Illinois, northern Indiana, western Lower Michigan as well as eastern portions of Iowa and Missouri (see yellow-shaded area on the highlighted map depicting a 15% chance of severe storms within 25 miles of a given location).

A few thunderstorms could develop as soon as later this morning and early afternoon, but the highest threat appears to be mid-to-late afternoon into the evening hours. Greatest risk will involve damaging winds to 60 miles per hour and large hail – half-dollar sized or greater along with heavy flash-flood-producing downpours of 1 to 2-inches in a short period of time.

With very unstable air overhead, dew points in the upper 60s and lower 70s, and temperatures expected to warm into the 90s during peak-heating, minor impulses aloft are expected to easily trigger storm clusters that can develop quickly and produce severe weather/localized flooding.

Most of our area is also included in an Excessive Rainfall outlook (yellow-shaded area on the Excessive Rainfall outlook map below, so localized flooding will be a problem, especially should storms develop/occur in those areas where heavy rains/flooding occurred yesterday.

Excessive rainfall Outlook map…

Day 1 Excessive Rainfall Forecast