579
WWUS83 KUNR 220336
RFWUNR
URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE RAPID CITY SD
936 PM MDT TUE APR 21 2026
...RED FLAG WARNING IN EFFECT LATE WEDNESDAY MORNING THROUGH
EARLY EVENING ACROSS NORTHEASTERN WYOMING AND WESTERN SOUTH
DAKOTA...
.HOT, DRY, AND WINDY CONDITIONS WILL SUPPORT WIDESPREAD CRITICAL
FIRE WEATHER CONDITIONS WEDNESDAY, MAINLY IN THE AFTERNOON AND
EVENING. TEMPERATURES TOMORROW WILL RANGE FROM THE 80S TO MID 90S
WITH MINIMUM HUMIDITIES DROPPING TO AS LOW AS 9%. MEANWHILE,
SOUTHWESTERLY WINDS WILL INCREASE THROUGH THE MORNING AS A COLD
FRONT APPROACHES THE REGION. SUSTAINED WINDS WILL BE AT 20 TO 30
MPH WITH GUSTS OF 35 TO 45 MPH. SCATTERED THUNDERSTORMS ARE
POSSIBLE ACROSS WESTERN TO CENTRAL SOUTH DAKOTA WEDNESDAY
AFTERNOON AND EVENING. THESE STORMS MAY CONTAIN CLOUD-TO-GROUND
LIGHTNING AND ERRATIC WINDS WITH GUSTS IN EXCESS OF 50 MPH WHILE
PRODUCING VERY LITTLE PRECIP. THIS COULD LEAD TO FIRE INITIATION.
CONDITIONS WILL IMPROVE WEDNESDAY EVENING AS TEMPERATURES FALL,
HUMIDITY RISES, AND A COLD FRONT QUICKLY CROSSES THE AREA.
SDZ319>335-WYZ314>318-221845-
/O.CON.KUNR.FW.W.0019.260422T1600Z-260423T0200Z/
NORTHERN BLACK HILLS-CENTRAL BLACK HILLS-SOUTHERN BLACK HILLS-
FALL RIVER COUNTY AREA-NORTHERN FOOT HILLS-EASTERN FOOT HILLS-
CUSTER COUNTY PLAINS-PINE RIDGE AREA-BUTTE COUNTY AREA-
PERKINS COUNTY-WEST CENTRAL PLAINS-ZIEBACH COUNTY-
HAAKON COUNTY AREA-BADLANDS AREA-BENNETT COUNTY AREA-
MELLETTE AND TODD COUNTIES-TRIPP COUNTY-NORTHERN CAMPBELL-
SOUTHERN CAMPBELL-CROOK COUNTY PLAINS-WESTON COUNTY PLAINS-
WYOMING BLACK HILLS-
936 PM MDT TUE APR 21 2026 /1036 PM CDT TUE APR 21 2026/
...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM MDT /11 AM CDT/
TO 8 PM MDT /9 PM CDT/ WEDNESDAY FOR GUSTY WINDS AND LOW RELATIVE
HUMIDITY FOR FIRE WEATHER ZONES 314, 315, 316, 317, 318, 319,
320, 321, 322, 323, 324, 325, 326, 327, 328, 329, 330, 331, 332,
333, 334, AND 335...
* AFFECTED AREA...FIRE WEATHER ZONES 314 NORTHERN CAMPBELL, 315
SOUTHERN CAMPBELL, 316 CROOK COUNTY PLAINS, 317 WESTON COUNTY
PLAINS, 318 WYOMING BLACK HILLS, 319 NORTHERN BLACK HILLS, 320
CENTRAL BLACK HILLS, 321 SOUTHERN BLACK HILLS, 322 FALL RIVER
COUNTY AREA, 323 NORTHERN FOOT HILLS, 324 EASTERN FOOT HILLS,
325 CUSTER COUNTY PLAINS, 326 PINE RIDGE AREA, 327 BUTTE
COUNTY AREA, 328 PERKINS COUNTY, 329 WEST CENTRAL PLAINS, 330
ZIEBACH COUNTY, 331 HAAKON COUNTY AREA, 332 BADLANDS AREA, 333
BENNETT COUNTY AREA, 334 MELLETTE AND TODD COUNTIES AND 335
TRIPP COUNTY.
* WINDS...SOUTHWEST 20 TO 30 MPH WITH GUSTS UP TO 45 MPH.
* RELATIVE HUMIDITY...AS LOW AS 9 PERCENT.
* IMPACTS...THE COMBINATION OF GUSTY WINDS AND LOW RELATIVE
HUMIDITY WOULD PRODUCE CRITICAL FIRE WEATHER CONDITIONS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS
ARE EITHER OCCURRING NOW, OR WILL SHORTLY. A COMBINATION OF
STRONG WINDS, LOW RELATIVE HUMIDITY, AND WARM TEMPERATURES CAN
CONTRIBUTE TO EXTREME FIRE BEHAVIOR.
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