Extreme Heat Warning
Status
Event Continued Active alertStart Time
Fri 08/14/2026 05:03 AM EDTEnd Time
Sat 08/15/2026 10:00 PM EDTSignificance
WarningImpacts
High impact
Locations Affected
Saint Louis, MO ∙ Columbia, MO ∙ O'Fallon, MO ∙ Saint Charles, MO ∙ Saint Peters, MO ∙ Florissant, MO ∙ Saint Libory, IL ∙ Cherryville, MO ∙ Hoffman, IL ∙ Centerville, MOFull Alert Message
URGENT - WEATHER MESSAGE National Weather Service St Louis MO 403 AM CDT Fri Aug 14 2026 ...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 9 PM CDT SATURDAY... * WHAT...Dangerously hot conditions with heat index values up to 112. * WHERE...Portions of south central and southwest Illinois and central, east central, and southeast Missouri. * WHEN...Until 9 PM CDT Saturday. * 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
ILZ069-074-079-100>102-MOZ041-047>051-059>065-072>075-084-085-099- 150015- /O.CON.KLSX.XH.W.0003.000000T0000Z-260816T0200Z/ Clinton IL-Washington IL-Randolph IL-Madison IL-Saint Clair IL- Monroe IL-Boone MO-Moniteau MO-Cole MO-Osage MO-Callaway MO- Montgomery 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 Louis, Cahokia, Chester, Union, Saint Charles, Washington, Sparta, Belleville, Edwardsville, Fulton, Farmington, Columbia, Sullivan, Jefferson City, and Alton 403 AM CDT Fri Aug 14 2026
