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WWUS85 KRIW 221809
RFWRIW
URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
1209 PM MDT WED APR 22 2026
WYZ275-276-280>283-285-287-289-300-230200-
/O.CON.KRIW.FW.W.0012.000000T0000Z-260423T0200Z/
NORTH BIGHORN BASIN/WORLAND BLM-CODY FOOTHILLS-
NATRONA COUNTY/CASPER BLM-JOHNSON COUNTY/CASPER BLM-
SOUTH BIGHORN BASIN/WORLAND BLM-
UPPER WIND RIVER BASIN/WIND RIVER BASIN-SOUTH BIGHORN MOUNTAINS-
OWL CREEK MOUNTAINS-GRANITE/GREEN/FERRIS/RATTLESNAKE MOUNTAINS-
CASPER MOUNTAIN-
1209 PM MDT WED APR 22 2026
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS
EVENING...
* AFFECTED AREA:
IN CENTRAL WY FIRE ZONES...280...283...285...289...300.
IN NORTH CENTRAL WY FIRE ZONES...275...276...281...282...287.
* COUNTIES AFFECTED:
IN CENTRAL WY...FREMONT...NATRONA.
IN NORTH CENTRAL WY...BIG HORN...HOT SPRINGS...JOHNSON...PARK
AND WASHAKIE.
IN SOUTHWEST WY...SWEETWATER.
* IMPACTS: STRONG GUSTY WIND...LOW HUMIDITY...AND UNSEASONABLY WARM
TEMPERATURES COULD CAUSE ERRATIC FIRE BEHAVIOR.
* WIND: SOUTHWEST 25 TO 35 MPH WITH WIDESPREAD GUSTS OF 35 TO 45
MPH. GUSTS IN NATRONA COUNTY WILL FREQUENTLY RANGE FROM 55 TO 65
MPH.
* HUMIDITY: AS LOW AS 8 TO 13 PERCENT.
* TEMPERATURES: HIGHS IN THE 60S, WITH 70S IN THE BIGHORN BASIN AND
AROUND CASPER.
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.
A HIGH WIND WARNING IS ALSO IN EFFECT UNTIL 8 PM WEDNESDAY FOR MOST
OF NATRONA COUNTY.
HTTP://WEATHER.GOV/RIVERTON
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