Chicago Warnings, Watches and Advisories

When a severe thunderstorm warning is issued, the storm may produce damaging winds, large hail, dangerous lightning, and heavy rain. In some cases, heavy rainfall produced by a severe storm can also lead to flash flooding. Do not drive vehicles through flooded areas. The water depth or fast flowing water/mud/debris from a flash flood will make road conditions unsafe. Do not rely soley on data presented here or other third-party websites - always check your official national and local weather service agency website, socials, radio and/or TV stations for making critical decisions related to weather events.

Please carefully read each posted Warning and Alert as it relates to the area(s) being affected. We may provide a wider range of issued severe weather warnings for surrounding cities and counties, so some alerts may not directly impact this location. This is done to help with preparing for severe weather that may overlap or be heading towards Chicago.

Use the Radar Maps link provided to understand the trajectory of a storm.

Heat Advisory issued September 9 at 3:14AM CDT until September 9 at 8:00PM CDT by NWS Paducah KY

* WHAT...Heat index values up to 109 degrees are expected. * WHERE...All of southern Illinois, southwest Indiana, western Kentucky, and southeast Missouri. * WHEN...From 11 AM CDT /noon EDT/ this morning to 8 PM CDT /9 PM EDT/ this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Heat Advisory issued September 9 at 2:40AM CDT until September 9 at 7:00PM CDT by NWS St Louis MO

* WHAT...Heat index values up to 107 expected. * WHERE...Portions of south central and southwest Illinois and southeast Missouri. * WHEN...From noon today to 7 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.