Heat Advisory
Status
Event Continued Active alertStart Time
Sat 09/19/2026 05:15 AM EDTEnd Time
Sat 09/19/2026 09:00 PM EDTSignificance
AdvisoryImpacts
Low impact
Locations Affected
Saint Louis, MO ∙ O'Fallon, MO ∙ Saint Charles, MO ∙ Saint Peters, MO ∙ Florissant, MO ∙ Imbs, IL ∙ Josephville, MO ∙ Dorsey, IL ∙ Pilot Knob, MO ∙ Alma, ILFull Alert Message
URGENT - WEATHER MESSAGE National Weather Service St Louis MO 415 AM CDT Sat Sep 19 2026 ...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING... * WHAT...Heat index values up to 101. * WHERE...Portions of south central and southwest Illinois and central, east central, and southeast Missouri. * WHEN...Until 8 PM CDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. 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
ILZ064-069-070-074-079-100>102-MOZ047>049-059>065-072>075-084-085- 099-200015- /O.CON.KLSX.HT.Y.0012.000000T0000Z-260920T0100Z/ Bond IL-Clinton IL-Marion IL-Washington IL-Randolph IL-Madison IL- Saint Clair IL-Monroe IL-Moniteau MO-Cole MO-Osage 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 Union, Salem, Saint Charles, Sparta, Washington, Saint Louis, Chester, Farmington, Jefferson City, Edwardsville, Sullivan, Belleville, Alton, Cahokia, and Centralia 415 AM CDT Sat Sep 19 2026
