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Jefferson County
Sunday July 26th, 2026 :: 09:47 a.m. CDT

Advisory

Extreme Heat Warning

* WHAT...Dangerously hot conditions with heat index values up to 115 expected. * WHERE...Portions of southern Illinois, western Kentucky, and southeast Missouri. * WHEN...Until 7 PM CDT Tuesday. * IMPACTS...Heat-related illnesses increase significantly during extreme heat and high humidity events. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air-conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9-1-1.

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

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

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