873
WWUS73 KFSD 200556
NPWFSD
URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1256 AM CDT MON JUL 20 2026
IAZ020>022-031-032-NEZ013-014-SDZ070-071-201900-
/O.UPG.KFSD.HT.Y.0005.260720T1700Z-260721T0100Z/
/O.NEW.KFSD.XH.W.0002.260720T1700Z-260721T0100Z/
PLYMOUTH-CHEROKEE-BUENA VISTA-WOODBURY-IDA-DIXON-DAKOTA-CLAY-
UNION-
INCLUDING THE CITIES OF LE MARS, BERESFORD, BATTLE CREEK, STORM LAKE,
ELK POINT, ALCESTER, ALLEN, NORTH SIOUX CITY, WAKEFIELD, CHEROKEE,
VERMILLION, PONCA, SIOUX CITY, SOUTH SIOUX CITY, JEFFERSON, HOLSTEIN,
AND IDA GROVE
1256 AM CDT MON JUL 20 2026
...EXTREME HEAT WARNING IN EFFECT FROM NOON TODAY TO 8 PM CDT THIS
EVENING...
* WHAT...DANGEROUSLY HOT CONDITIONS WITH HEAT INDEX VALUES UP TO 110
EXPECTED.
* WHERE...PORTIONS OF NORTHWEST AND WEST CENTRAL IOWA, NORTHEAST
NEBRASKA, AND SOUTHEAST SOUTH DAKOTA.
* WHEN...FROM NOON TODAY TO 8 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.
DO NOT LEAVE YOUNG CHILDREN AND PETS IN UNATTENDED VEHICLES. CAR
INTERIORS WILL REACH LETHAL TEMPERATURES IN A MATTER OF MINUTES.
TAKE EXTRA PRECAUTIONS WHEN OUTSIDE. WEAR LIGHTWEIGHT AND LOOSE
FITTING CLOTHING. TRY TO LIMIT STRENUOUS ACTIVITIES TO EARLY MORNING
OR EVENING. TAKE ACTION WHEN YOU SEE SYMPTOMS OF HEAT EXHAUSTION AND
HEAT STROKE.
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.
IAZ001>003-012>014-SDZ050-063>069-201900-
/O.CON.KFSD.HT.Y.0005.260720T1700Z-260721T0100Z/
LYON-OSCEOLA-DICKINSON-SIOUX-O'BRIEN-CLAY-GREGORY-CHARLES MIX-
DOUGLAS-HUTCHINSON-TURNER-LINCOLN-BON HOMME-YANKTON-
INCLUDING THE CITIES OF DELMONT, INWOOD, CLAYTON, SIOUX CENTER,
VIBORG, YANKTON, SPENCER, MARION, SANBORN, SIBLEY, WAGNER, MENNO,
PARKER, ROCK VALLEY, CANTON, LARCHWOOD, LAKE ANDES, TABOR, GEORGE,
CORSICA, ROCK RAPIDS, MARTY, TRIPP, HARRISBURG, BURKE, ARMOUR,
MILFORD, SPIRIT LAKE, SHELDON, HURLEY, HULL, HAWARDEN, ORANGE CITY,
SPRINGFIELD, IRENE, TEA, FREEMAN, TYNDALL, PARKSTON, SCOTLAND,
LENNOX, ARNOLDS PARK, PLATTE, HARTLEY, CENTERVILLE, AVON, GREGORY,
AND CHANCELLOR
1256 AM CDT MON JUL 20 2026
...HEAT ADVISORY REMAINS IN EFFECT FROM NOON TODAY TO 8 PM CDT THIS
EVENING...
* WHAT...HEAT INDEX VALUES UP TO 104 EXPECTED.
* WHERE...PORTIONS OF NORTHWEST IOWA AND SOUTH CENTRAL AND SOUTHEAST
SOUTH DAKOTA.
* WHEN...FROM NOON TODAY TO 8 PM CDT THIS EVENING.
* IMPACTS...HOT TEMPERATURES AND HIGH HUMIDITY MAY CAUSE HEAT
ILLNESSES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT LEAVE YOUNG CHILDREN AND PETS IN UNATTENDED VEHICLES. CAR
INTERIORS WILL REACH LETHAL TEMPERATURES IN A MATTER OF MINUTES.
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.
IG
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