Receive alerts from your local agencies
...or text your ZIP CODE to 888777 for mobile alerts

Full Notification

Jefferson County
Monday July 20th, 2026 :: 08:38 a.m. CDT

Advisory

Heat Advisory until 11:00AM Tuesday

* WHAT...For the Heat Advisory, heat index values of 100 to 106. For the Extreme Heat Warning, dangerously hot conditions with heat index values of 110 to 116.

* WHERE...Portions of southern Illinois, western Kentucky, and southeast Missouri.

* WHEN...For the Heat Advisory, until 11 AM CDT Tuesday. For the Extreme Heat Warning, from 11 AM to 7 PM CDT Tuesday.

* IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses.

* AFFECTED AREAS: JEFFERSON ... PERRY ... FRANKLIN ... HAMILTON ... JACKSON ... WILLIAMSON ... SALINE ... GALLATIN ... UNION ... JOHNSON ... POPE ... HARDIN ... ALEXANDER ... PULASKI ... MASSAC ... FULTON ... HICKMAN ... CARLISLE ... BALLARD ... MCCRACKEN ... GRAVES ... LIVINGSTON ... MARSHALL ... CALLOWAY ... CRITTENDEN ... LYON ... TRIGG ... CALDWELL ... UNION ... WEBSTER ... HOPKINS ... CHRISTIAN ... MUHLENBERG ... TODD ... PERRY ... BOLLINGER ... CAPE GIRARDEAU ... WAYNE ... CARTER ... RIPLEY ... BUTLER ... STODDARD ... SCOTT ... MISSISSIPPI ... NEW MADRID

Instructions:

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

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

Navigate & Discover