759
WWUS85 KRIW 110817
RFWRIW
URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
217 AM MDT TUE AUG 11 2026
WYZ140-120300-
/O.EXA.KRIW.FW.W.0023.260811T1800Z-260812T0300Z/
YELLOWSTONE NATIONAL PARK-
217 AM MDT TUE AUG 11 2026
...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 9 PM MDT THIS
EVENING...
THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A RED FLAG
WARNING, WHICH IS IN EFFECT FROM NOON TODAY TO 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 140.
* COUNTIES AFFECTED:
IN NORTHWEST WY...YELLOWSTONE NATIONAL PARK.
* WIND: WEST 10 TO 15 MPH WITH GUSTS UP TO 30 MPH.
* HUMIDITY: AS LOW AS 14 PERCENT.
* TEMPERATURES: 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.
WYZ280-281-285-300-120300-
/O.CON.KRIW.FW.W.0023.260811T1800Z-260812T0300Z/
NATRONA COUNTY/CASPER BLM-JOHNSON COUNTY/CASPER BLM-
SOUTH BIGHORN MOUNTAINS-CASPER MOUNTAIN-
217 AM MDT TUE AUG 11 2026
...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 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: NORTH 10 TO 20 MPH WITH GUSTS UP TO 25 MPH.
* HUMIDITY: AS LOW AS 9 PERCENT.
* TEMPERATURES: HIGHS IN THE LOWER TO MIDDLE 90S; HIGHS IN THE
UPPER 80S IN ZONES 285/300.
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.
WYZ283-287-289-120300-
/O.CON.KRIW.FW.W.0023.260811T1800Z-260812T0300Z/
UPPER WIND RIVER BASIN/WIND RIVER BASIN-OWL CREEK MOUNTAINS-
GRANITE/GREEN/FERRIS/RATTLESNAKE MOUNTAINS-
217 AM MDT TUE AUG 11 2026
...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 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: NORTHWEST 10 TO 15 MPH WITH GUSTS UP TO 25 MPH.
* HUMIDITY: AS LOW AS 10 PERCENT.
* TEMPERATURES: HIGHS IN THE UPPER 80S TO MIDDLE 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.
WYZ286-120300-
/O.CON.KRIW.FW.W.0023.260811T1800Z-260812T0300Z/
ABSAROKA MOUNTAINS/NORTH SHOSHONE NF-
217 AM MDT TUE AUG 11 2026
...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 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 30 MPH.
* HUMIDITY: AS LOW AS 13 PERCENT.
* TEMPERATURES: HIGHS IN THE UPPER 70S TO MIDDLE 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.
WYZ278-279-120300-
/O.CON.KRIW.FW.W.0023.260811T1800Z-260812T0300Z/
UPPER GREEN RIVER BASIN/ROCK SPRINGS BLM-
SWEETWATER COUNTY/ROCK SPRINGS BLM/FLAMING GORGE NRA-
217 AM MDT TUE AUG 11 2026
...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 9 PM MDT
THIS EVENING...
* IMPACTS: LOW HUMIDITIES...HOT TEMPERATURES...STRONG GUSTY
WINDS...AND DRY THUNDERSTORMS WITH GUSTY AND ERRATIC OUTFLOW
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 15 MPH.
* THUNDERSTORMS: LIGHTNING AND OUTFLOW WIND GUSTS OF 50 TO 55 MPH
WILL BE POSSIBLE THROUGH EARLY TUESDAY EVENING.
* HUMIDITY: AS LOW AS 14 PERCENT.
* TEMPERATURES: HIGHS IN THE MIDDLE 80S TO NEAR 90 DEGREES.
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.
HTTP://WEATHER.GOV/RIVERTON
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