111
WWUS85 KRIW 110254
RFWRIW
URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
854 PM MDT MON AUG 10 2026
WYZ280-281-285-300-112100-
/O.EXP.KRIW.FW.W.0022.000000T0000Z-260811T0300Z/
/O.CON.KRIW.FW.W.0023.260811T1800Z-260812T0300Z/
NATRONA COUNTY/CASPER BLM-JOHNSON COUNTY/CASPER BLM-
SOUTH BIGHORN MOUNTAINS-CASPER MOUNTAIN-
854 PM MDT MON AUG 10 2026
...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 9 PM MDT
TUESDAY...
..RED FLAG WARNING WILL EXPIRE AT 9 PM MDT THIS EVENING
* IMPACTS: LOW HUMIDITIES...HOT TEMPERATURES...AND STRONG GUSTY
WINDS COULD CAUSE ERRATIC FIRE BEHAVIOR.
* AFFECTED AREA:
IN CENTRAL WY FIRE ZONES...280...285...300.
IN NORTH CENTRAL WY FIRE ZONE....281.
* COUNTIES AFFECTED:
IN CENTRAL WY...FREMONT...NATRONA.
IN NORTH CENTRAL WY...HOT SPRINGS...JOHNSON...WASHAKIE.
* WIND: WEST 10 TO 20 MPH WITH GUSTS UP TO 30 MPH.
* HUMIDITY: AS LOW AS 9 PERCENT.
* TEMPERATURES: LOWS AROUND 60. HIGHS IN THE LOWER 90S.
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.
WYZ283-287-289-112100-
/O.EXP.KRIW.FW.W.0022.000000T0000Z-260811T0300Z/
/O.CON.KRIW.FW.W.0023.260811T1800Z-260812T0300Z/
UPPER WIND RIVER BASIN/WIND RIVER BASIN-OWL CREEK MOUNTAINS-
GRANITE/GREEN/FERRIS/RATTLESNAKE MOUNTAINS-
854 PM MDT MON AUG 10 2026
...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 9 PM MDT
TUESDAY...
..RED FLAG WARNING WILL EXPIRE AT 9 PM MDT THIS EVENING
* IMPACTS: LOW HUMIDITIES...HOT TEMPERATURES...AND STRONG GUSTY
WINDS COULD CAUSE ERRATIC FIRE BEHAVIOR.
* AFFECTED AREA:
IN CENTRAL WY FIRE ZONES...283...289.
IN NORTH CENTRAL WY FIRE ZONE....287.
* COUNTIES AFFECTED:
IN CENTRAL WY...FREMONT...NATRONA.
IN NORTH CENTRAL WY...HOT SPRINGS.
IN SOUTHWEST WY...SWEETWATER.
* WIND: WEST 10 TO 20 MPH WITH GUSTS UP TO 30 MPH.
* HUMIDITY: AS LOW AS 10 PERCENT.
* TEMPERATURES: LOWS AROUND 60. HIGHS AROUND 90.
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.
WYZ286-112100-
/O.EXP.KRIW.FW.W.0022.000000T0000Z-260811T0300Z/
/O.CON.KRIW.FW.W.0023.260811T1800Z-260812T0300Z/
ABSAROKA MOUNTAINS/NORTH SHOSHONE NF-
854 PM MDT MON AUG 10 2026
...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 9 PM MDT
TUESDAY...
..RED FLAG WARNING WILL EXPIRE AT 9 PM MDT THIS EVENING
* IMPACTS: LOW HUMIDITIES...HOT TEMPERATURES...AND STRONG GUSTY
WINDS COULD CAUSE ERRATIC FIRE BEHAVIOR.
* AFFECTED AREA:
IN NORTHWEST WY...FIRE WEATHER ZONE 286.
* COUNTIES AFFECTED:
IN CENTRAL WY...FREMONT.
IN NORTH CENTRAL WY...HOT SPRINGS...PARK.
* WIND: WEST 10 TO 20 MPH WITH GUSTS UP TO 35 MPH.
* HUMIDITY: AS LOW AS 12 PERCENT.
* TEMPERATURES: LOWS IN THE LOWER 50S. HIGHS IN THE UPPER 70S.
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.
WYZ278-279-112100-
/O.EXP.KRIW.FW.W.0022.000000T0000Z-260811T0300Z/
/O.CON.KRIW.FW.W.0023.260811T1800Z-260812T0300Z/
UPPER GREEN RIVER BASIN/ROCK SPRINGS BLM-
SWEETWATER COUNTY/ROCK SPRINGS BLM/FLAMING GORGE NRA-
854 PM MDT MON AUG 10 2026
...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 9 PM MDT
TUESDAY...
..RED FLAG WARNING WILL EXPIRE AT 9 PM MDT THIS EVENING
* IMPACTS: LOW HUMIDITIES...HOT TEMPERATURES...AND STRONG GUSTY
WINDS COULD CAUSE ERRATIC FIRE BEHAVIOR.
* AFFECTED AREA:
IN SOUTHWEST WY FIRE ZONE....279.
IN WEST CENTRAL WY FIRE ZONE....278.
* COUNTIES AFFECTED:
IN SOUTHWEST WY...SWEETWATER.
IN WEST CENTRAL WY...LINCOLN...SUBLETTE.
* WIND: WEST 10 TO 20 MPH WITH GUSTS UP TO 30 MPH.
* HUMIDITY: AS LOW AS 14 PERCENT.
* TEMPERATURES: LOWS IN THE MID 50S. HIGHS IN THE MID 80S.
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.
WYZ277-110400-
/O.EXP.KRIW.FW.W.0022.000000T0000Z-260811T0300Z/
LINCOLN AND UINTA COUNTIES/LOWER ELEVATIONS-
854 PM MDT MON AUG 10 2026
..RED FLAG WARNING WILL EXPIRE AT 9 PM MDT THIS EVENING
WINDS HAVE DIMINISHED AND RELATIVE HUMIDITIES HAVE BEGUN TO
INCREASE IN MOST LOCATIONS ACROSS CENTRAL AND SOUTHERN WYOMING,
THUS TODAY'S RED FLAG WARNING WILL BE ALLOWED TO EXPIRE AT 9PM.
RELATIVE HUMIDITY VALUES WILL RECOVER TO THE 30 TO 60 PERCENT RANGE
WITH LIGHT WINDS OVERNIGHT. RED FLAG WARNINGS WILL BE IN EFFECT
AGAIN FOR MUCH OF CENTRAL AND SOUTHERN WYOMING FROM NOON TO 9PM ON
TUESDAY, AUGUST 11TH.
HTTP://WEATHER.GOV/RIVERTON
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