854
WWUS85 KRIW 102000
RFWRIW
URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
200 PM MDT MON AUG 10 2026
WYZ280-281-285-300-111300-
/O.NEW.KRIW.FW.W.0023.260811T1800Z-260812T0300Z/
/O.CON.KRIW.FW.W.0022.000000T0000Z-260811T0300Z/
NATRONA COUNTY/CASPER BLM-JOHNSON COUNTY/CASPER BLM-
SOUTH BIGHORN MOUNTAINS-CASPER MOUNTAIN-
200 PM MDT MON AUG 10 2026
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...
..RED FLAG WARNING IN EFFECT FROM NOON TO 9 PM MDT TUESDAY
THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A RED FLAG
WARNING, WHICH IS IN EFFECT FROM NOON TO 9 PM MDT TUESDAY.
* 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: LIGHTNING AND OUTFLOW WIND GUSTS TO 60 MPH WILL BE
POSSIBLE THROUGH MONDAY AFTERNOON.
* HUMIDITY: AS LOW AS 9 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.
WYZ283-287-289-111300-
/O.NEW.KRIW.FW.W.0023.260811T1800Z-260812T0300Z/
/O.CON.KRIW.FW.W.0022.000000T0000Z-260811T0300Z/
UPPER WIND RIVER BASIN/WIND RIVER BASIN-OWL CREEK MOUNTAINS-
GRANITE/GREEN/FERRIS/RATTLESNAKE MOUNTAINS-
200 PM MDT MON AUG 10 2026
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...
..RED FLAG WARNING IN EFFECT FROM NOON TO 9 PM MDT TUESDAY
THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A RED FLAG
WARNING, WHICH IS IN EFFECT FROM NOON TO 9 PM MDT TUESDAY.
* 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: LIGHTNING AND OUTFLOW WIND GUSTS TO 60 MPH WILL BE
POSSIBLE THROUGH MONDAY AFTERNOON.
* HUMIDITY: AS LOW AS 10 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.
WYZ286-111300-
/O.NEW.KRIW.FW.W.0023.260811T1800Z-260812T0300Z/
/O.CON.KRIW.FW.W.0022.000000T0000Z-260811T0300Z/
ABSAROKA MOUNTAINS/NORTH SHOSHONE NF-
200 PM MDT MON AUG 10 2026
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...
..RED FLAG WARNING IN EFFECT FROM NOON TO 9 PM MDT TUESDAY
THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A RED FLAG
WARNING, WHICH IS IN EFFECT FROM NOON TO 9 PM MDT TUESDAY.
* 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: LIGHTNING AND OUTFLOW WIND GUSTS TO 60 MPH WILL BE
POSSIBLE THROUGH MONDAY AFTERNOON.
* HUMIDITY: AS LOW AS 13 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.
WYZ278-279-111300-
/O.NEW.KRIW.FW.W.0023.260811T1800Z-260812T0300Z/
/O.CON.KRIW.FW.W.0022.000000T0000Z-260811T0300Z/
UPPER GREEN RIVER BASIN/ROCK SPRINGS BLM-
SWEETWATER COUNTY/ROCK SPRINGS BLM/FLAMING GORGE NRA-
200 PM MDT MON AUG 10 2026
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...
..RED FLAG WARNING IN EFFECT FROM NOON TO 9 PM MDT TUESDAY
THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A RED FLAG
WARNING, WHICH IS IN EFFECT FROM NOON TO 9 PM MDT TUESDAY.
* 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 20 MPH WITH GUSTS UP TO 30 MPH.
* THUNDERSTORMS: LIGHTNING AND OUTFLOW WIND GUSTS TO 60 MPH WILL BE
POSSIBLE THROUGH MONDAY AFTERNOON.
* 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.
WYZ277-110300-
/O.CON.KRIW.FW.W.0022.000000T0000Z-260811T0300Z/
LINCOLN AND UINTA COUNTIES/LOWER ELEVATIONS-
200 PM MDT MON AUG 10 2026
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 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 WEATHER ZONE 277.
* COUNTIES AFFECTED:
IN SOUTHWEST WY...UINTA.
IN WEST CENTRAL WY...LINCOLN.
* WIND: WEST 10 TO 20 MPH WITH GUSTS UP TO 30 MPH.
* THUNDERSTORMS: LIGHTNING AND OUTFLOW WIND GUSTS TO 60 MPH WILL BE
POSSIBLE THROUGH MONDAY AFTERNOON.
* HUMIDITY: AS LOW AS 15 PERCENT.
* TEMPERATURES: 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.
HTTP://WEATHER.GOV/RIVERTON
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