One product issued by NWS for:
Extreme Heat Warning
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 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 ...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. && $$