185
WWUS73 KLSX 160637
NPWLSX

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

MOZ035-036-042-160745-
/O.CAN.KLSX.HT.Y.0007.000000T0000Z-260817T0200Z/
Ralls MO-Pike MO-Audrain MO-
Including the cities of Bowling Green and Mexico
137 AM CDT Sun Aug 16 2026

...HEAT ADVISORY IS CANCELLED...

Heat index values are not expected to exceed 100 degrees in these
areas today, and as such, the Heat Advisory has been cancelled.

$$

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.

&&

$$

ILZ070-162145-
/O.CON.KLSX.XH.W.0003.000000T0000Z-260817T0200Z/
Marion IL-
Including the cities of Centralia and Salem
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...Marion IL County.

* 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. 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-MOZ052-162145-
/O.CON.KLSX.HT.Y.0007.000000T0000Z-260817T0200Z/
Greene IL-Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Calhoun IL-
Jersey IL-Lincoln MO-
Including the cities of Litchfield and Vandalia
137 AM CDT Sun Aug 16 2026

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

* WHAT...Heat index values of 100 to 105 degrees are expected.

* WHERE...In Illinois, Bond IL, Fayette IL, Montgomery IL, Calhoun
  IL, Greene IL, Jersey IL, and Macoupin IL Counties. In Missouri,
  Lincoln 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.

&&

$$