876
WWUS73 KLSX 301727
NPWLSX
URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE ST LOUIS MO
1227 PM CDT SUN AUG 30 2026
ILZ058>060-064-065-070-095>099-MOZ018-019-026-027-034>036-041-042-
047>052-059-060-062-065-072>075-084-085-099-310830-
/O.NEW.KLSX.HT.Y.0008.260831T1700Z-260905T0100Z/
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-WARREN MO-FRANKLIN MO-JEFFERSON MO-CRAWFORD MO-
WASHINGTON MO-SAINT FRANCOIS MO-SAINTE GENEVIEVE MO-IRON MO-
MADISON MO-REYNOLDS MO-
INCLUDING THE CITIES OF FARMINGTON, SULLIVAN, FULTON, MOUNT STERLING,
CENTRALIA, BOWLING GREEN, UNION, MEXICO, LITCHFIELD, PITTSFIELD,
QUINCY, COLUMBIA, WASHINGTON, VANDALIA, JEFFERSON CITY, HANNIBAL, AND
SALEM
1227 PM CDT SUN AUG 30 2026
..HEAT ADVISORY IN EFFECT FROM NOON MONDAY TO 8 PM CDT FRIDAY
* WHAT...HEAT INDEX VALUES OF 100 TO 105 EXPECTED, WITH MORNING LOW
TEMPERATURES OF 70 TO 78 DEGREES, FOR SEVERAL CONSECUTIVE DAYS.
* WHERE...PORTIONS OF SOUTH CENTRAL, SOUTHWEST, AND WEST CENTRAL
ILLINOIS AND CENTRAL, EAST CENTRAL, NORTHEAST, AND SOUTHEAST
MISSOURI.
* WHEN...FROM NOON MONDAY TO 8 PM CDT FRIDAY.
* IMPACTS...HOT TEMPERATURES AND MODERATE 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.
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.
ILZ069-074-079-100>102-MOZ061-063-064-310830-
/O.NEW.KLSX.XH.A.0004.260831T1700Z-260905T0100Z/
CLINTON IL-WASHINGTON IL-RANDOLPH IL-MADISON IL-SAINT CLAIR IL-
MONROE IL-SAINT CHARLES MO-SAINT LOUIS MO-SAINT LOUIS CITY MO-
INCLUDING THE CITIES OF SPARTA, ALTON, EDWARDSVILLE, SAINT CHARLES,
SAINT LOUIS, BELLEVILLE, CHESTER, AND CAHOKIA
1227 PM CDT SUN AUG 30 2026
...EXTREME HEAT WATCH IN EFFECT FROM MONDAY AFTERNOON THROUGH FRIDAY
EVENING...
* WHAT...DANGEROUSLY HOT CONDITIONS WITH HEAT INDEX VALUES OF 102 TO
108 DEGREES, AND MORNING LOWS FROM 75 TO 80 DEGREES, POSSIBLE FOR
SEVERAL CONSECUTIVE DAYS.
* WHERE...IN ILLINOIS, CLINTON IL, WASHINGTON IL, MADISON IL, MONROE
IL, RANDOLPH IL, AND SAINT CLAIR IL COUNTIES. IN MISSOURI, SAINT
CHARLES MO, SAINT LOUIS CITY MO, AND SAINT LOUIS MO COUNTIES.
* WHEN...FROM MONDAY AFTERNOON THROUGH FRIDAY EVENING.
* IMPACTS...HEAT RELATED ILLNESSES INCREASE SIGNIFICANTLY DURING
EXTREME HEAT AND HIGH HUMIDITY EVENTS.
* ADDITIONAL DETAILS...IN ADDITION TO NEAR-RECORD AFTERNOON
TEMPERATURES, WARM MORNING LOWS MAY PROVIDE LITTLE RELIEF,
ESPECIALLY WEDNESDAY THROUGH FRIDAY.
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.
MONITOR THE LATEST FORECASTS AND WARNINGS FOR UPDATES.
BRC
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