WWUS83 KUNR 201059

RFWUNR



URGENT - FIRE WEATHER MESSAGE

National Weather Service Rapid City SD

459 AM MDT Mon Apr 20 2026



...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM MDT /NOON CDT/

THIS MORNING TO 8 PM MDT /9 PM CDT/ THIS EVENING FOR GUSTY WINDS

AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 315, 317, 321,

322, 325, 326, 332, 333, 334, AND 335...



.Temperatures will reach into the upper 70s to mid 80s across 

portions of northeastern Wyoming and southern South Dakota this 

afternoon. Afternoon humidities will drop into the single digits 

to low teens. The very warm and dry conditions in combination 

with dry fuels and westerly winds gusting up to 30 mph will 

support critical fire weather conditions this afternoon. Overnight

humidity recoveries will be poor (less than 55 percent) across 

northeastern Wyoming into the Black Hills and southwestern South

Dakota tonight.



SDZ321-322-325-326-332>335-WYZ315-317-210200-

/O.CON.KUNR.FW.W.0018.260420T1700Z-260421T0200Z/

Southern Black Hills-Fall River County Area-Custer County Plains-

Pine Ridge Area-Badlands Area-Bennett County Area-

Mellette and Todd Counties-Tripp County-Southern Campbell-

Weston County Plains-

459 AM MDT Mon Apr 20 2026 /559 AM CDT Mon Apr 20 2026/



...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM MDT /NOON CDT/

THIS MORNING TO 8 PM MDT /9 PM CDT/ THIS EVENING FOR GUSTY WINDS

AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 315, 317, 321,

322, 325, 326, 332, 333, 334, AND 335...



* AFFECTED AREA...Fire Weather Zones 315 Southern Campbell, 317 

  Weston County Plains, 321 Southern Black Hills, 322 Fall River 

  County Area, 325 Custer County Plains, 326 Pine Ridge Area, 

  332 Badlands Area, 333 Bennett County Area, 334 Mellette and 

  Todd Counties and 335 Tripp County.



* WINDS...West 10 to 20 mph with gusts up to 30 mph.



* RELATIVE HUMIDITY...As low as 8 percent.



* IMPACTS...The combination of dry fuels, low relative 

  humidities, gusty winds, and hot temperatures will produce 

  critical fire weather conditions. New fires could spread 

  rapidly.



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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