Extreme Heat Warning

Status

Event Continued Active alert

Start Time

Thu 08/13/2026 11:28 AM EDT

End Time

Sat 08/15/2026 10:00 PM EDT

Significance

Warning

Impacts

High impact

Locations Affected

Saint Louis, MO ∙ Columbia, MO ∙ O'Fallon, MO ∙ Saint Charles, MO ∙ Saint Peters, MO ∙ Florissant, MO ∙ Arcadia, MO ∙ Doe Run, MO ∙ Kirkwood, MO ∙ Mattese, MO

Full Alert Message

URGENT - WEATHER MESSAGE National Weather Service St Louis MO Issued by National Weather Service Paducah KY 1028 AM CDT Thu Aug 13 2026 ...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 9 PM CDT SATURDAY... * WHAT...Dangerously hot conditions with heat index values up to 113. * 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.

Technical Header

ILZ069-074-079-100>102-MOZ041-047>051-059>065-072>075-084-085-099- 140300- /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 Charles, Columbia, Belleville, Edwardsville, Jefferson City, Saint Louis, Farmington, Fulton, Alton, Sullivan, Chester, Washington, Sparta, Cahokia, and Union 1028 AM CDT Thu Aug 13 2026