Saint Libory, IL 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 Saint Libory.

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

Heat Advisory issued September 1 at 9:47PM CDT until September 3 at 7:00PM CDT by NWS Quad Cities IA IL

* WHAT...Heat index values up to 105. * WHERE...Portions of northwest and west central Illinois, east central and southeast Iowa, and northeast Missouri. * WHEN...Until 7 PM CDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Thunderstorms and storm outflow may interrupt the heat at times.

Heat Advisory issued September 1 at 9:47PM CDT until September 3 at 7:00PM CDT by NWS Quad Cities IA IL

* WHAT...Heat index values up to 105 expected. * WHERE...Portions of north central and northwest Illinois and east central and northeast Iowa. * WHEN...Until 7 PM CDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Thunderstorms and storm outflow may interrupt the heat at times.

Heat Advisory issued September 1 at 9:03PM CDT until September 2 at 9:00PM CDT by NWS Chicago IL

* WHAT...Peak heat index values up to 105 degrees expected Wednesday afternoon. * WHERE...Portions of central, east central, north central, and northeast Illinois and northwest Indiana. * WHEN...From noon CDT /1 PM EDT/ to 9 PM CDT /10 PM EDT/ Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Air Quality Alert issued September 1 at 2:56PM CDT by NWS St Louis MO

The St. Louis Clean Air Partnership has issued an air quality alert for the St. Louis metropolitan area from 9 AM to 8 PM CDT Wednesday. An Orange air quality forecast means that maximum ozone concentrations are expected to reach levels that pose a health risk. Adverse health effects increase as air quality deteriorates. Ground- level ozone is an air contaminant which can cause breathing difficulties for children, older adults, as well as persons with respiratory problems. Reducing outdoor physical activity is recommended. If it is a regularly scheduled work day you are urged to consider telecommuting, carpooling, or utilizing public transit. Avoid excessive idling and do not top off when refueling motor vehicles. The use of gasoline-powered lawn equipment should be reduced or postponed until late in the day. For more information visit the St. Louis Clean Air Partnership at http://cleanair-stlouis.com/ For current Air Quality Index (AQI) values visit https://www.airnow.gov/

Heat Advisory issued September 1 at 1:11PM CDT until September 3 at 7:00PM CDT by NWS Lincoln IL

* WHAT...Heat index values up to 105. * WHERE...Portions of central, east central, southeast, and west central Illinois. * WHEN...Until 7 PM CDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Heat Advisory issued September 1 at 12:55PM CDT until September 5 at 8:00PM CDT by NWS St Louis MO

* WHAT...Heat index values up to 109. * WHERE...In Illinois, Madison IL, Monroe IL, and Saint Clair IL Counties. In Missouri, Jefferson MO, Saint Charles MO, Saint Louis City MO, and Saint Louis MO Counties. * WHEN...Until 8 PM CDT Saturday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Heat Advisory issued September 1 at 12:55PM CDT until September 5 at 8:00PM CDT by NWS St Louis MO

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

Extreme Heat Warning issued September 1 at 11:46AM CDT until September 5 at 8:00PM CDT by NWS Paducah KY

* WHAT...Dangerously hot conditions with peak daily heat index values 103 to 109 degrees; actual maximum air temperatures will range from 95 to 101 degrees daily! * WHERE...All of southern Illinois, southwest Indiana, western Kentucky, and southeast Missouri. * WHEN...Until 8 PM CDT /9 PM EDT/ Saturday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...This week of extreme and dangerous heat shows no signs of abating. Climatologically extreme high forecast temperatures a good 10 to 15 degrees above their seasonal normals will combine with the effects of humidity to increasingly make this week a dangerous period of prolonged heat. Heat index values hit triple digits every day and may top out up to 109 degrees. Actual air temperatures reach to near or even above 100 degrees multiple days in a row. Numerous nights might have warm record overnight low temperatures in the mid 70s as well, so there is really no significant break offered from the heat as we head into the holiday weekend and all the numerous activities and outdoor events that may be planned.