Hillyard 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 Hillyard.

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

Heat Advisory issued September 3 at 2:39AM CDT until September 3 at 7:00PM CDT by NWS Quad Cities IA IL

* WHAT...Heat index values of 100 to 105. * WHERE...Portions of northwest Illinois and east central and northeast Iowa. * WHEN...Until 7 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Extreme Heat Warning issued September 3 at 2:39AM CDT until September 4 at 7:00PM CDT by NWS Quad Cities IA IL

* WHAT...Dangerously hot conditions with heat index values of 100 to 110. * WHERE...Portions of north central, northwest, and west central Illinois, east central and southeast Iowa, and northeast Missouri. * WHEN...Until 7 PM CDT Friday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.

Extreme Heat Warning issued September 3 at 2:38AM CDT until September 5 at 7:00PM CDT by NWS Lincoln IL

* WHAT...Dangerously hot conditions with heat index values up to 105. * WHERE...Portions of central, east central, southeast, and west central Illinois. * WHEN...Until 7 PM CDT Saturday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.

Extreme Heat Warning issued September 3 at 2:38AM CDT until September 4 at 7:00PM CDT by NWS Lincoln IL

* WHAT...Dangerously hot conditions with heat index values up to 105. * WHERE...Portions of central, east central, and west central Illinois. * WHEN...Until 7 PM CDT Friday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.

Extreme Heat Warning issued September 3 at 2:32AM CDT until September 5 at 8:00PM CDT by NWS Paducah KY

* WHAT...Dangerously hot conditions with heat index values 105 to 110. * 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...Overnight low temperatures in the mid 70s will provide little relief from the heat.

Heat Advisory issued September 3 at 1:08AM CDT until September 3 at 9:00PM CDT by NWS Chicago IL

* WHAT...Heat index values of 100 to 105 expected. This is the third day in a row with forecast or observed heat indices above 100 degrees. * WHERE...Portions of central, east central, north central, and northeast Illinois and northwest Indiana. * WHEN...Until 9 PM CDT /10 PM EDT/ this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses especially after several days of dangerous heat.

Heat Advisory issued September 3 at 1:08AM CDT until September 3 at 9:00PM CDT by NWS Chicago IL

* WHAT...Heat index values of 100 to 105 expected. This is the third day in a row with forecast or observed heat indices above 100 degrees. * WHERE...Winnebago County. * WHEN...Until 9 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses especially after several days of dangerous heat.

Extreme Heat Warning issued September 3 at 1:08AM CDT until September 3 at 7:00PM CDT by NWS Chicago IL

* WHAT...Dangerously hot conditions with heat index values of 100 to 105 expected. This is the third day in a row with a forecast or observed maximum heat index over 100 degrees. * WHERE...Central Cook, Northern Cook, and Southern Cook Counties. * WHEN...Until 7 PM CDT this evening. * IMPACTS...The threat for heat related illnesses increases significantly during prolonged periods of hot temperatures and high humidity levels. * ADDITIONAL DETAILS...A cold front possibly accompanied by thunderstorms will move inland from Lake Michigan this afternoon and evening leading to rapidly improving conditions.

Heat Advisory issued September 3 at 1:08AM CDT until September 3 at 7:00PM CDT by NWS Chicago IL

* WHAT...Heat index values of 100 to 105 expected. This is the third day in a row with forecast or observed heat indices above 100 degrees. * WHERE...Boone, DuPage, Kane, and McHenry Counties. * WHEN...Until 7 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses especially after several days of dangerous heat. * ADDITIONAL DETAILS...A cold front possibly accompanied by thunderstorms will move inland from Lake Michigan this evening leading to rapidly improving conditions.

Extreme Heat Warning issued September 3 at 12:12AM CDT until September 5 at 8:00PM CDT by NWS St Louis MO

* WHAT...Dangerously hot conditions with heat index values up to 110. * 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...Heat related illnesses increase significantly during extreme heat and high humidity events.

Extreme Heat Warning issued September 3 at 12:12AM CDT until September 5 at 8:00PM CDT by NWS St Louis MO

* WHAT...Dangerously hot conditions with heat index values up to 107. * 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...Heat related illnesses increase significantly during extreme heat and high humidity events.