401
WWUS73 KLSX 210020
NPWLSX
URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE ST LOUIS MO
720 PM CDT MON JUL 20 2026
ILZ069-074-079-100>102-MOZ041-047>051-059>065-072>075-084-085-099-
211530-
/O.CON.KLSX.HT.Y.0004.000000T0000Z-260722T0000Z/
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 EDWARDSVILLE, CAHOKIA, WASHINGTON, ALTON,
CHESTER, SPARTA, SULLIVAN, FARMINGTON, BELLEVILLE, SAINT CHARLES,
FULTON, JEFFERSON CITY, COLUMBIA, SAINT LOUIS, AND UNION
720 PM CDT MON JUL 20 2026
..HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT TUESDAY
* WHAT...HEAT INDEX VALUES UP TO 108.
* WHERE...PORTIONS OF SOUTH CENTRAL AND SOUTHWEST ILLINOIS AND
CENTRAL, EAST CENTRAL, AND SOUTHEAST MISSOURI.
* WHEN...UNTIL 7 PM CDT TUESDAY.
* 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.
ILZ095-097-098-MOZ018-019-026-027-034>036-042-052-210130-
/O.CON.KLSX.HT.Y.0004.000000T0000Z-260721T0100Z/
ADAMS IL-PIKE IL-CALHOUN IL-KNOX MO-LEWIS MO-SHELBY MO-MARION MO-
MONROE MO-RALLS MO-PIKE MO-AUDRAIN MO-LINCOLN MO-
INCLUDING THE CITIES OF QUINCY, HANNIBAL, MEXICO, PITTSFIELD, AND
BOWLING GREEN
720 PM CDT MON JUL 20 2026
..HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING
* WHAT...HEAT INDEX VALUES UP TO 104.
* WHERE...PORTIONS OF SOUTHWEST AND WEST CENTRAL ILLINOIS AND
CENTRAL, EAST CENTRAL, AND NORTHEAST MISSOURI.
* WHEN...UNTIL 8 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.
PEINE
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