497
WWUS85 KCYS 210146
RFWCYS
URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE CHEYENNE WY
746 PM MDT MON APR 20 2026
..RED FLAG WARNING FROM 11AM TUESDAY THROUGH 8PM WEDNESDAY
NEZ434>437-WYZ417-418-430>433-211400-
/O.EXP.KCYS.FW.W.0017.000000T0000Z-260421T0200Z/
/O.CON.KCYS.FW.W.0018.260421T1700Z-260423T0200Z/
PINE RIDGE/NEBRASKA NATIONAL FOREST-
BOX BUTTE/SOUTH SIOUX/NIOBRARA RIVER-
LOWER NORTH PLATTE RIVER BASIN/SCOTTSBLUFF NATIONAL MONUMENT-
LODGEPOLE CREEK/SOUTHERN NEBRASKA PANHANDLE-
NIOBRARA/LOWER ELEVATIONS OF CONVERSE/THUNDER BASIN NATIONAL
GRASSLAND-
MIDDLE NORTH PLATTE RIVER BASIN/NIOBRARA AND CONVERSE HIGH PLAINS-
LARAMIE FOOTHILLS AND HIGH PLAINS-LARAMIE EAST HIGH PLAINS-
BORDEAUX/CHUGWATER/WHEATLAND-GOSHEN/MIDDLE-
LOWER NORTH PLATTE RIVER BASIN-
746 PM MDT MON APR 20 2026
..RED FLAG WARNING WILL EXPIRE AT 8 PM MDT THIS EVENING
...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TUESDAY TO 8 PM
MDT WEDNESDAY FOR LOW RH AND GUSTY WINDS FOR FIRE WEATHER ZONES
417, 418, 430, 431, 432, 433, 434, 435, 436, AND 437......
RED FLAG WARNING WILL BE ALLOWED TO EXPIRE THIS EVENING AS WINDS
HAVE DIMINISHED BELOW CRITICAL FIRE WEATHER CRITERIA. HOWEVER, RED
FLAG WARNING FOR TUESDAY AFTERNOON REMAINS IN EFFECT.
* AFFECTED AREA...FOR TUESDAY AND WEDNESDAY, FIRE WEATHER ZONES
417, 418, AND 430 THROUGH 437.
* WIND... SOUTHERLY WINDS 10 TO 15 MPH ON TUESDAY WITH GUSTY
ERRATIC SHOWERS IN THE AFTERNOON. SOUTHWEST WINDS WITH GUSTS
BETWEEN 30 AND 45 MPH ON WEDNESDAY.
* HUMIDITY...5 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.
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