315
WWUS85 KCYS 110708
RFWCYS
URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE CHEYENNE WY
108 AM MDT TUE AUG 11 2026
WYZ417>430-120300-
/O.CON.KCYS.FW.W.0038.260811T1800Z-260812T0300Z/
NIOBRARA/LOWER ELEVATIONS OF CONVERSE/THUNDER BASIN NATIONAL
GRASSLAND-
MIDDLE NORTH PLATTE RIVER BASIN/NIOBRARA AND CONVERSE HIGH PLAINS-
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-LARAMIE FOOTHILLS AND HIGH PLAINS-
108 AM MDT TUE AUG 11 2026
...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 9 PM MDT
THIS EVENING FOR LOW RH, GUSTY WINDS, AND DRY LIGHTNING FOR FIRE
WEATHER ZONES 417, 418, 419, 420, 421, 422, 423, 424, 425, 426,
427, 428, 429, AND 430...
THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A RED FLAG
WARNING, WHICH IS IN EFFECT FROM NOON TO 9 PM MDT TUESDAY.
* AFFECTED AREA...FIRE WEATHER ZONES 417 THROUGH 430.
* WIND...WEST TO NORTHWEST AT 15 TO 20 MPH WITH GUSTS UP TO 35
MPH, TURNING NORTHERLY INTO THE EVENING HOURS.
* HUMIDITY...BETWEEN 8 AND 16 PERCENT.
* ADDITIONAL DETAILS...ISOLATED HIGH-BASED SHOWERS WILL HAVE
THE POTENTIAL TO PRODUCE GUSTY AND ERRATIC WINDS ALONG WITH A
FEW STRIKES OF LIGHTNING WITHOUT MUCH, IF ANY, RAINFALL
DURING THE AFTERNOON AND EVENING HOURS.
* 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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