Illinois, Wisconsin Preparing for Dangerous Storms and Possible Tornadoes

UPDATED: 1:45 pm on June 6, 2026

Severe Thunderstorm Warning for Winnebago County until 2:45 pm on Wednesday, June 10.

Forecasters are monitoring a significant severe weather outbreak that's possible on Wednesday and Thursday across northern Illinois and southeastern Wisconsin.

Hot, Humid Air Setting the Stage

Residents around the stateline area should closely monitor weather forecasts this week, with an increased threat of dangerous storms that could bring strong winds, hail, and possible Tornadoes.

According to the National Weather Service, temperatures are expected to be in the low-to-mid 90s on Wednesday and Thursday, with heat indices between 95 and 100 expected.

Wednesday Could Be a Precursor

While current forecasts show Thursday (6/11) has a higher threat level, Wednesday is not expected to be quiet. Latest forecast models show storms developing across Iowa and Wisconsin that may track into northern Illinois.

NWS has a 30 percent chance of showers and thunderstorms after 1 pm on Wednesday (6/10), and an 80 percent chance of storms late on Wednesday night and into Thursday morning, with the possibility of strong winds and hail.

Thursday Currently Appears Most Concerning

Forecasters are increasingly focused on Thursday as a powerful weather system moves into the Midwest. According to the NOAA Storm Prediction Center, portions of northern Illinois, including Rockford, are in the ENHANCED zone for severe weather on Wednesday and Thursday.

Potential hazards with Thursday's storms include damaging winds, large hail, torrential rainfall, and isolated tornadoes.

What Residents Should Know

With several days remaining before this possible weather event unfolds, forecast details will likely change, but residents in northern Illinois and southern Wisconsin should be weather-aware.

Review severe weather safety plans, ensure weather alerts are enabled on your mobile device, and ensure your weather radios have fresh batteries.