638
WWUS85 KRIW 100823
RFWRIW
URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
223 AM MDT MON AUG 10 2026
WYZ280-281-285-300-102200-
/O.NEW.KRIW.FW.W.0022.260810T1800Z-260811T0300Z/
NATRONA COUNTY/CASPER BLM-JOHNSON COUNTY/CASPER BLM-
SOUTH BIGHORN MOUNTAINS-CASPER MOUNTAIN-
223 AM MDT MON AUG 10 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...STRONG GUSTY
WINDS...AND DRY THUNDERSTORMS WITH GUSTY AND ERRATIC OUTFLOW
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.
* THUNDERSTORMS: WILL HAVE THE BEST CHANCES IN ZONES 280, 289 AND
300. WIND GUSTS UP TO 55 MPH WILL BE POSSIBLE FROM OUTFLOWS.
* HUMIDITY: AS LOW AS 10 PERCENT.
* TEMPERATURES: HIGHS IN THE LOWER 90S; HIGHS IN THE 80S IN ZONES
285 AND 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.
WYZ283-287-289-102200-
/O.NEW.KRIW.FW.W.0022.260810T1800Z-260811T0300Z/
UPPER WIND RIVER BASIN/WIND RIVER BASIN-OWL CREEK MOUNTAINS-
GRANITE/GREEN/FERRIS/RATTLESNAKE MOUNTAINS-
223 AM MDT MON AUG 10 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...STRONG GUSTY
WINDS...AND DRY THUNDERSTORMS WITH GUSTY AND ERRATIC OUTFLOW
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.
* THUNDERSTORMS: WIND GUSTS UP TO 55 MPH WILL BE POSSIBLE FROM
OUTFLOWS.
* HUMIDITY: AS LOW AS 11 PERCENT.
* TEMPERATURES: HIGHS IN THE MIDDLE 90S; HIGHS AROUND 90 IN ZONE
287.
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.
WYZ286-102200-
/O.NEW.KRIW.FW.W.0022.260810T1800Z-260811T0300Z/
ABSAROKA MOUNTAINS/NORTH SHOSHONE NF-
223 AM MDT MON AUG 10 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...STRONG GUSTY
WINDS...AND DRY THUNDERSTORMS WITH GUSTY AND ERRATIC OUTFLOW
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.
* THUNDERSTORMS: THERE IS A 20 TO 30% CHANCE FOR VIRGA SHOWERS/DRY
THUNDERSTORMS BETWEEN 1500 AND 2000. WIND GUSTS UP TO 55 MPH WILL
BE POSSIBLE FROM OUTFLOWS.
* HUMIDITY: AS LOW AS 15 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.
WYZ277>279-102200-
/O.NEW.KRIW.FW.W.0022.260810T1800Z-260811T0300Z/
LINCOLN AND UINTA COUNTIES/LOWER ELEVATIONS-
UPPER GREEN RIVER BASIN/ROCK SPRINGS BLM-
SWEETWATER COUNTY/ROCK SPRINGS BLM/FLAMING GORGE NRA-
223 AM MDT MON AUG 10 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...STRONG GUSTY
WINDS...AND DRY THUNDERSTORMS WITH GUSTY AND ERRATIC OUTFLOW
WINDS COULD CAUSE ERRATIC FIRE BEHAVIOR.
* AFFECTED AREA:
IN SOUTHWEST WY FIRE ZONES...277...279.
IN WEST CENTRAL WY FIRE ZONE....278.
* COUNTIES AFFECTED:
IN SOUTHWEST WY...SWEETWATER...UINTA.
IN WEST CENTRAL WY...LINCOLN...SUBLETTE.
* WIND: WEST 10 TO 20 MPH WITH GUSTS UP TO 30 MPH.
* THUNDERSTORMS: WIND GUSTS UP TO 55 MPH WILL BE POSSIBLE FROM
OUTFLOWS.
* HUMIDITY: AS LOW AS 15 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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