Summit, IL Warnings, Watches and Advisories

Heat Advisory issued September 17 at 10:53AM CDT until September 20 at 7:00PM CDT by NWS Paducah KY

* WHAT...Heat index values up to 103-109 degrees can be expected. * WHERE...all of southern Illinois, southwest Indiana, western Kentucky, and southeast Missouri. * WHEN...Until 7 PM CDT /8 PM EDT/ Sunday. * IMPACTS...Record to near record hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...The Heat Advisory has been extended thru Sunday for the entire Quad State Region. Although heat index values will only be near 100, the prolonged period of late season hot temperatures and high humidity will continue to elevate heat-related health impacts.

Heat Advisory issued September 17 at 10:05AM CDT until September 17 at 7:00PM CDT by NWS Lincoln IL

* WHAT...Heat index values up to 103. * WHERE...Portions of central, east central, southeast, and west central Illinois. * WHEN...Until 7 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Heat Advisory issued September 17 at 2:19AM CDT until September 18 at 8:00PM CDT by NWS St Louis MO

* WHAT...Heat index values up to 105. * WHERE...In Illinois, Fayette IL, Montgomery IL, Calhoun IL, Greene IL, Jersey IL, and Macoupin IL Counties. In Missouri, Boone MO, Callaway MO, Lincoln MO, and Montgomery MO Counties. * WHEN...Until 8 PM CDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Heat Advisory issued September 17 at 2:19AM CDT until September 19 at 8:00PM CDT by NWS St Louis MO

* WHAT...Heat index values up to 106. * WHERE...Portions of south central and southwest Illinois and central, east central, and southeast Missouri. * WHEN...Until 8 PM CDT Saturday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

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 Summit.

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