329
WWUS73 KLSX 151858
NPWLSX

URGENT - WEATHER MESSAGE
National Weather Service St Louis MO
158 PM CDT Sat Aug 15 2026

ILZ069-074-079-100>102-MOZ041-047>051-059>065-072>075-084-085-099-
161200-
/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 Sullivan, Sparta, Alton, Saint Louis,
Washington, Cahokia, Fulton, Columbia, Edwardsville, Chester, Union,
Farmington, Saint Charles, Belleville, and Jefferson City
158 PM CDT Sat Aug 15 2026

...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 9 PM CDT SUNDAY...

* WHAT...Dangerously hot conditions with heat index values up to 109.

* WHERE...Portions of south central and southwest Illinois and
  central, east central, and southeast Missouri.

* WHEN...Until 9 PM CDT Sunday.

* 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.

&&

$$

ILZ070-161200-
/O.CON.KLSX.XH.W.0003.000000T0000Z-260817T0200Z/
Marion IL-
Including the cities of Centralia and Salem
158 PM CDT Sat Aug 15 2026

...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 9 PM CDT SUNDAY...

* WHAT...Dangerously hot conditions with heat index values up to 106.

* WHERE...Marion IL County.

* WHEN...Until 9 PM CDT Sunday.

* 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. Young children and
pets should never be left unattended in vehicles under any
circumstances. Take extra precautions if you work or spend time
outside. When possible reschedule strenuous activities to early
morning or evening. Know the signs and symptoms of heat exhaustion
and heat stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational Safety
and Health Administration recommends scheduling frequent rest breaks
in shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.

&&

$$

ILZ058>060-064-065-098-099-MOZ035-036-042-052-161200-
/O.CON.KLSX.HT.Y.0007.000000T0000Z-260817T0200Z/
Greene IL-Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Calhoun IL-
Jersey IL-Ralls MO-Pike MO-Audrain MO-Lincoln MO-
Including the cities of Vandalia, Bowling Green, Mexico, and
Litchfield
158 PM CDT Sat Aug 15 2026

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM CDT SUNDAY...

* WHAT...Heat index values up to 105.

* WHERE...Portions of south central and southwest Illinois and
  central, east central, and northeast Missouri.

* WHEN...Until 9 PM CDT Sunday.

* 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.

&&

$$

MOZ034-160200-
/O.CON.KLSX.HT.Y.0007.000000T0000Z-260816T0200Z/
Monroe MO-
158 PM CDT Sat Aug 15 2026

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 9 PM CDT THIS EVENING...

* WHAT...Heat index values up to 102.

* WHERE...Monroe MO County.

* WHEN...Until 9 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. Young children and
pets should never be left unattended in vehicles under any
circumstances. Take extra precautions if you work or spend time
outside. When possible reschedule strenuous activities to early
morning or evening. Know the signs and symptoms of heat exhaustion
and heat stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational Safety
and Health Administration recommends scheduling frequent rest breaks
in shaded or air conditioned environments. Anyone overcome by heat
should be moved to a cool and shaded location. Heat stroke is an
emergency! Call 9 1 1.

&&

$$

Elmore