Extreme Heat Watch
Status
New Event Active alertStart Time
Sun 07/26/2026 12:00 PM EDTEnd Time
Tue 07/28/2026 08:00 PM EDTSignificance
WatchImpacts
Moderate impact
Locations Affected
Saint Louis, MO ∙ Columbia, MO ∙ O'Fallon, MO ∙ Saint Charles, MO ∙ Saint Peters, MO ∙ Florissant, MO ∙ La Grange, MO ∙ Jerseyville, IL ∙ Saint Clair, MO ∙ Leslie, MOFull Alert Message
URGENT - WEATHER MESSAGE National Weather Service St Louis MO 112 AM CDT Fri Jul 24 2026 ...EXTREME HEAT WATCH IN EFFECT FROM SUNDAY MORNING THROUGH TUESDAY EVENING... * WHAT...Dangerously hot conditions with heat index values up to 110 possible. * WHERE...Portions of south central, southwest, and west central Illinois and central, east central, northeast, and southeast Missouri. * WHEN...From Sunday morning through Tuesday evening. * 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.
Technical Header
ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027- 034>036-041-042-047>052-059>065-072>075-084-085-099-242115- /O.NEW.KLSX.XH.A.0002.260726T1600Z-260729T0000Z/ Greene IL-Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Clinton IL- Marion IL-Washington IL-Randolph IL-Adams IL-Brown IL-Pike IL- Calhoun IL-Jersey IL-Madison IL-Saint Clair IL-Monroe IL-Knox MO- Lewis MO-Shelby MO-Marion MO-Monroe MO-Ralls MO-Pike MO-Boone MO- Audrain MO-Moniteau MO-Cole MO-Osage MO-Callaway MO-Montgomery MO- Lincoln MO-Gasconade MO-Warren MO-Saint Charles MO-Franklin MO- Saint Louis MO-Saint Louis City MO-Jefferson MO-Crawford MO- Washington MO-Saint Francois MO-Sainte Genevieve MO-Iron MO- Madison MO-Reynolds MO- Including the cities of Saint Charles, Centralia, Fulton, Union, Sullivan, Columbia, Mount Sterling, Hannibal, Farmington, Cahokia, Washington, Chester, Salem, Edwardsville, Sparta, Quincy, Belleville, Saint Louis, Jefferson City, Bowling Green, Alton, Vandalia, Mexico, Pittsfield, and Litchfield 112 AM CDT Fri Jul 24 2026
