Extreme Heat Warning
Status
Event Continued Active alertStart Time
Sun 08/16/2026 02:37 AM EDTEnd Time
Sun 08/16/2026 10:00 PM EDTSignificance
WarningImpacts
High impact
Full Alert Message
URGENT - WEATHER MESSAGE National Weather Service St Louis MO Issued by National Weather Service Kansas City/Pleasant Hill MO 137 AM CDT Sun Aug 16 2026 ...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 9 PM CDT THIS EVENING... * WHAT...Dangerously hot conditions with heat index values of 105 to 110 degrees. * WHERE...Portions of south central and southwest Illinois and central, east central, and southeast Missouri. * WHEN...Until 9 PM CDT this 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
ILZ069-074-079-100>102-MOZ041-047>051-059>065-072>075-084-085-099- 162145- /O.CON.KLSX.XH.W.0003.000000T0000Z-260817T0200Z/ 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 Washington, Cahokia, Chester, Sullivan, Sparta, Columbia, Jefferson City, Farmington, Edwardsville, Belleville, Saint Louis, Union, Alton, Saint Charles, and Fulton 137 AM CDT Sun Aug 16 2026
