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Jefferson County
Friday July 24th, 2026 :: 12:19 p.m. CDT

Advisory

Heat Advisory until 07:00PM Tuesday

* WHAT...Heat index values up to 111 expected.

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

* WHEN...From 11 AM Sunday to 7 PM CDT Tuesday.

* IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

* AFFECTED AREAS: JEFFERSON ... PERRY ... FRANKLIN ... JACKSON ... WILLIAMSON ... UNION ... JOHNSON ... POPE ... ALEXANDER ... PULASKI ... MASSAC ... FULTON ... HICKMAN ... CARLISLE ... BALLARD ... MCCRACKEN ... GRAVES ... LIVINGSTON ... MARSHALL ... CALLOWAY ... 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

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