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Jefferson County
Tuesday September 15th, 2026 :: 11:17 a.m. CDT

Advisory

Heat Advisory until 07:00PM Friday

* WHAT...Peak Daily Heat Index Values up to around 105 degrees.

* WHERE...All of southern Illinois, southwest Indiana, western Kentucky, and southeast Missouri.

* WHEN...Until 7 PM CDT /8 PM EDT/ Friday.

* IMPACTS...Record to near record hot temperatures and high humidity may cause heat illnesses.

* ADDITIONAL DETAILS...The Heat Advisory has been extended thru Friday for the entire Quad State Region.

* AFFECTED AREAS: JEFFERSON ... WAYNE ... EDWARDS ... WABASH ... PERRY ... FRANKLIN ... HAMILTON ... WHITE ... JACKSON ... WILLIAMSON ... SALINE ... GALLATIN ... UNION ... JOHNSON ... POPE ... HARDIN ... ALEXANDER ... PULASKI ... MASSAC ... GIBSON ... PIKE ... POSEY ... VANDERBURGH ... WARRICK ... SPENCER ... BALLARD ... MCCRACKEN ... LIVINGSTON ... MARSHALL ... CALLOWAY ... CRITTENDEN ... LYON ... TRIGG ... CALDWELL ... UNION ... WEBSTER ... HOPKINS ... CHRISTIAN ... HENDERSON ... DAVIESS ... MCLEAN ... MUHLENBERG ... TODD ... PERRY ... BOLLINGER ... CAPE GIRARDEAU ... WAYNE

Instructions:

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.

Address/Location
Jefferson County
100 S 10th St
Mount Vernon, IL 62864

Contact
Emergency: 9-1-1
Non-emergencies: 618-244-8000

Alert Details

Severity:
Moderate - Possible threat to life or property
Urgency:
Expected - Responsive action SHOULD be taken soon (within next hour)
Certainty:
Likely (p > ~50%)
Category:
Meteorological (inc. flood)
Event:
Heat Advisory

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