498
WWUS73 KLSX 280700
NPWLSX

URGENT - WEATHER MESSAGE
National Weather Service St Louis MO
200 AM CDT Sun Jun 28 2026

ILZ069-074-079-MOZ060-062-075-282200-
/O.UPG.KLSX.HT.Y.0002.260628T1700Z-260703T0500Z/
/O.EXA.KLSX.XH.W.0001.260628T1700Z-260703T0500Z/
Clinton IL-Washington IL-Randolph IL-Warren MO-Franklin MO-Sainte
Genevieve MO-
Including the cities of Sullivan, Washington, Sparta, Chester, and
Union
200 AM CDT Sun Jun 28 2026

...EXTREME HEAT WARNING IN EFFECT FROM NOON TODAY TO MIDNIGHT CDT
THURSDAY NIGHT...

* WHAT...Dangerously hot conditions with heat index values up to 110
  expected.

* WHERE...In Illinois, Clinton IL, Washington IL, and Randolph IL
  Counties. In Missouri, Franklin MO, Warren MO, and Sainte Genevieve
  MO Counties.

* WHEN...From noon today to midnight CDT Thursday Night.

* 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.

&&

$$

ILZ100>102-MOZ061-063>065-282200-
/O.CON.KLSX.XH.W.0001.260628T1700Z-260703T0500Z/
Madison IL-Saint Clair IL-Monroe IL-Saint Charles MO-Saint Louis
MO-Saint Louis City MO-Jefferson MO-
Including the cities of Edwardsville, Saint Charles, Cahokia,
Belleville, Saint Louis, and Alton
200 AM CDT Sun Jun 28 2026

...EXTREME HEAT WARNING REMAINS IN EFFECT FROM NOON TODAY TO MIDNIGHT
CDT THURSDAY NIGHT...

* WHAT...Dangerously hot conditions with heat index values up to 110
  expected.

* WHERE...In Illinois, Madison IL, Monroe IL, and Saint Clair IL
  Counties. In Missouri, Jefferson MO, Saint Charles MO, Saint Louis
  City MO, and Saint Louis MO Counties.

* WHEN...From noon today to midnight CDT Thursday Night.

* 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>060-064-065-070-095>099-MOZ018-019-026-027-034>036-041-042-
047>052-059-072>074-084-085-099-282200-
/O.CON.KLSX.HT.Y.0002.260628T1700Z-260703T0500Z/
Greene IL-Macoupin IL-Montgomery IL-Bond IL-Fayette IL-Marion IL-
Adams IL-Brown IL-Pike IL-Calhoun IL-Jersey IL-Knox MO-Lewis MO-
Shelby MO-Marion MO-Monroe MO-Ralls MO-Pike MO-Boone MO-Audrain
MO-Moniteau MO-Cole MO-Osage MO-Callaway MO-Montgomery MO-Lincoln
MO-Gasconade MO-Crawford MO-Washington MO-Saint Francois MO-Iron
MO-Madison MO-Reynolds MO-
Including the cities of Vandalia, Bowling Green, Fulton, Centralia,
Mount Sterling, Pittsfield, Salem, Farmington, Litchfield, Columbia,
Quincy, Hannibal, Mexico, and Jefferson City
200 AM CDT Sun Jun 28 2026

...HEAT ADVISORY REMAINS IN EFFECT FROM NOON TODAY TO MIDNIGHT CDT
THURSDAY NIGHT...

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

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

* WHEN...From noon today to midnight CDT Thursday Night.

* 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.

&&

$$

Kimble