713
WWUS85 KCYS 062300
RFWCYS
URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE CHEYENNE WY
500 PM MDT WED AUG 6 2025
...MULTI-DAY CRITICAL FIRE WEATHER CONDITIONS CONTINUE WITH
LITTLE OVERNIGHT RELIEF...
.A MULTI-DAY CRITICAL FIRE WEATHER EVENT IS ONGOING THIS WEEK DUE
TO LOW RH VALUES INTO THE TEENS AND SINGLE DIGITS, ALONGSIDE POOR
OVERNIGHT RECOVERIES AND GUSTY WINDS. THURSDAY WILL BRING SOME OF
THE WORST CONDITIONS OF THE WEEK WITH WIDESPREAD STRONG WEST TO
SOUTHWEST WINDS AND VERY LOW RH BETWEEN 8 AND 12%.
WYZ417-418-071200-
/O.CON.KCYS.FW.W.0017.250807T1800Z-250808T0200Z/
NIOBRARA/LOWER ELEVATIONS OF CONVERSE/THUNDER BASIN NATIONAL
GRASSLAND-
MIDDLE NORTH PLATTE RIVER BASIN/NIOBRARA AND CONVERSE HIGH PLAINS-
500 PM MDT WED AUG 6 2025
...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 8 PM MDT
THURSDAY FOR LOW RH VALUES AND GUSTY WINDS FOR FIRE WEATHER ZONES
417 AND 418...
* AFFECTED AREA...FIRE WEATHER ZONES 417 AND 418.
* WIND...WEST TO SOUTHWEST WINDS GUSTING 20 TO 30 MPH.
* HUMIDITY...8 TO 12 PERCENT
* IMPACTS...ANY FIRES THAT DEVELOP WILL LIKELY SPREAD RAPIDLY.
OUTDOOR BURNING IS NOT RECOMMENDED.
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.
WYZ419>429-071200-
/O.CON.KCYS.FW.W.0017.000000T0000Z-250809T0000Z/
NORTH LARAMIE RANGE AND ADJACENT HIGH PLAINS-
NORTH LARAMIE VALLEY/SHIRLEY BASIN-
FERRIS/SEMINOE/SHIRLEY MOUNTAINS-CENTRAL AND WEST CARBON-
SOUTHWEST CARBON COUNTY-SIERRA MADRE RANGE/MEDICINE BOW NF-
UPPER NORTH PLATTE RIVER BASIN-SNOWY RANGE/MEDICINE BOW NF-
NORTH SNOWY RANGE FOOTHILLS-SOUTHERN LARAMIE VALLEY-
SOUTHERN LARAMIE RANGE-
500 PM MDT WED AUG 6 2025
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM MDT FRIDAY FOR
LOW RH VALUES, POOR OVERNIGHT RECOVERY, AND GUSTY WINDS FOR FIRE
WEATHER ZONES 419, 420, 421, 422, 423, 424, 425, 426, 427, 428,
AND 429...
* AFFECTED AREA...FIRE WEATHER ZONES 419 THROUGH 429.
* WIND...WEST TO SOUTHWEST WINDS GUSTING 20 TO 30 MPH, ISOLATED
GUSTS 35 TO 40 MPH.
* HUMIDITY...MINIMUMS OF 8 TO 12 PERCENT; OVERNIGHT RECOVERIES AS
LOW AS 25 TO 40 PERCENT.
* IMPACTS...ANY FIRES THAT DEVELOP WILL LIKELY SPREAD RAPIDLY.
OUTDOOR BURNING IS NOT RECOMMENDED.
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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