Severe Weather Threatens Chicago Area

The Chicago area is bracing for another round of severe weather, with storms capable of producing tornadoes and flash flooding expected on Thursday. A large portion of the region is under an enhanced risk for severe weather, designated as a level three out of five.

Storm Timing and Initial Impacts

Storms began moving into the region early Thursday morning, particularly in areas north and west. While the initial line of storms wasn't expected to reach severe levels, heavy downpours caused hazardous road conditions and led to a ground stop at O'Hare Airport for departures headed to Chicago, lasting until at least 6:15 a.m.

Afternoon and Evening Storms

A “bit of a lull” is anticipated for the start of the afternoon as a warm front lifts north. However, a wind advisory is in effect from 1-7 p.m. for much of the area, with gusts potentially reaching up to 45 mph. Kankakee County, Illinois, and Lake, Porter, Newton, and Jasper counties in northwest Indiana are under a wind advisory from 10 a.m. to 7 p.m. CT, with gusts up to 50 mph possible.

The storms are expected to continue into the late evening and overnight hours before diminishing in the early morning hours on Friday.

Risk Levels and Potential Hazards

While nearly all of the Chicago area is under an enhanced risk, a smaller area stretching from north of Chicago along the lakefront down to southern suburbs and into northwest Indiana is designated as a “slight risk,” a level two out of five.

Key Threats

  • Damaging Wind Gusts
  • Large Hail
  • Potential for Strong, Long-Track Tornadoes
  • Flash Flooding

“The main threats here will be damaging wind gusts and hail. There could be some strong, long-track tornadoes and I think that’s really what we’re going to have to watch,” stated a meteorologist.

Extended Forecast and Weekend Outlook

Another round of strong to severe storms is expected Thursday afternoon and evening. Temperatures are expected to gradually decrease, leading to the storms’ dissipation late Thursday or early Friday morning.

The National Weather Service indicates a potential for further severe storms on Friday afternoon/evening and possibly again on Saturday. However, confidence in these storms is currently low due to uncertainties in frontal timing and placement. A warm front could bring temperatures into the 60s, potentially creating conditions favorable for funnel clouds and tornadoes. A cold front is also expected to sweep across the region Friday night and Saturday, bringing another chance for potentially severe storms.