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Home Return to list Fire Weather Warning 0021 Issued by the Riverton Forecast Office
Action: New Issued At: 2026-08-07 13:28:22
843
WWUS85 KRIW 071827
RFWRIW
URGENT - FIRE WEATHER MESSAGE
National Weather Service Riverton WY
1227 PM MDT Fri Aug 7 2026
WYZ277>279-289-081230-
/O.NEW.KRIW.FW.W.0021.260808T1700Z-260810T0300Z/
/O.CON.KRIW.FW.W.0020.000000T0000Z-260808T0300Z/
Lincoln and Uinta Counties/Lower Elevations-
Upper Green River Basin/Rock Springs BLM-
Sweetwater County/Rock Springs BLM/Flaming Gorge NRA-
Granite/Green/Ferris/Rattlesnake Mountains-
1227 PM MDT Fri Aug 7 2026
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...
...RED FLAG WARNING IN EFFECT FROM 11 AM SATURDAY TO 9 PM MDT
SUNDAY...
The National Weather Service in Riverton has issued a Red Flag
Warning, which is in effect from 11 AM Saturday to 9 PM MDT
Sunday.
* IMPACTS: Low Humidities and Strong Gusty Winds could cause
erratic fire behavior.
* AFFECTED AREA:
In Central WY Fire Zone....289.
In Southwest WY Fire Zones...277...279.
In West Central WY Fire Zone....278.
* COUNTIES AFFECTED:
In Central WY...Fremont...Natrona.
In Southwest WY...Sweetwater...Uinta.
In West Central WY...Lincoln...Sublette.
* WIND: West 10 to 20 mph with gusts up to 35 mph.
* HUMIDITY: As low as 8 percent. Humidity recovery each night will
remain below 40 percent.
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.
&&
$$
WYZ288-081230-
/O.NEW.KRIW.FW.W.0021.260808T1700Z-260810T0300Z/
/O.CON.KRIW.FW.W.0020.000000T0000Z-260808T0300Z/
East Wind River Mountains/South Shoshone NF-
1227 PM MDT Fri Aug 7 2026
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...
...RED FLAG WARNING IN EFFECT FROM 11 AM SATURDAY TO 9 PM MDT
SUNDAY...
The National Weather Service in Riverton has issued a Red Flag
Warning, which is in effect from 11 AM Saturday to 9 PM MDT
Sunday.
* IMPACTS: Low Humidities and Strong Gusty Winds could cause
erratic fire behavior.
* AFFECTED AREA:
In Central WY...Fire Weather Zone 288.
* COUNTIES AFFECTED:
In Central WY...Fremont.
In West Central WY...Sublette.
* WIND: West 15 to 25 mph with gusts up to 40 mph.
* HUMIDITY: As low as 9 percent. Humidity recovery each night will
remain below 40 percent.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Red Flag Warning means that critical fire weather conditions are
either occurring now....or will shortly. A combination of strong
winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.
&&
$$
WYZ140-275-276-280>283-285>287-300-081230-
/O.NEW.KRIW.FW.W.0021.260808T1700Z-260810T0300Z/
Yellowstone National Park-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-
Absaroka Mountains/North Shoshone NF-Owl Creek Mountains-
Casper Mountain-
1227 PM MDT Fri Aug 7 2026
...RED FLAG WARNING IN EFFECT FROM 11 AM SATURDAY TO 9 PM MDT
SUNDAY...
The National Weather Service in Riverton has issued a Red Flag
Warning, which is in effect from 11 AM Saturday to 9 PM MDT
Sunday.
* IMPACTS: Low Humidities and Strong Gusty Winds could cause
erratic fire behavior.
* AFFECTED AREA:
In Central WY Fire Zones...280...283...285...300.
In North Central WY Fire Zones...275...276...281...282...287.
In Northwest WY Fire Zones...140...286.
* COUNTIES AFFECTED:
In Central WY...Fremont...Natrona.
In North Central WY...Big Horn...Hot Springs...Johnson...Park
Washakie.
In Northwest WY...Yellowstone National Park.
* WIND: Northwest 10 to 20 mph with gusts up to 30 mph.
* HUMIDITY: As low as 8 percent. Humidity recovery each night remains
below 40 percent.
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.
&&
$$
http://weather.gov/riverton
Action: New Issued At: 2026-08-07 13:28:22
843
WWUS85 KRIW 071827
RFWRIW
URGENT - FIRE WEATHER MESSAGE
National Weather Service Riverton WY
1227 PM MDT Fri Aug 7 2026
WYZ277>279-289-081230-
/O.NEW.KRIW.FW.W.0021.260808T1700Z-260810T0300Z/
/O.CON.KRIW.FW.W.0020.000000T0000Z-260808T0300Z/
Lincoln and Uinta Counties/Lower Elevations-
Upper Green River Basin/Rock Springs BLM-
Sweetwater County/Rock Springs BLM/Flaming Gorge NRA-
Granite/Green/Ferris/Rattlesnake Mountains-
1227 PM MDT Fri Aug 7 2026
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...
...RED FLAG WARNING IN EFFECT FROM 11 AM SATURDAY TO 9 PM MDT
SUNDAY...
The National Weather Service in Riverton has issued a Red Flag
Warning, which is in effect from 11 AM Saturday to 9 PM MDT
Sunday.
* IMPACTS: Low Humidities and Strong Gusty Winds could cause
erratic fire behavior.
* AFFECTED AREA:
In Central WY Fire Zone....289.
In Southwest WY Fire Zones...277...279.
In West Central WY Fire Zone....278.
* COUNTIES AFFECTED:
In Central WY...Fremont...Natrona.
In Southwest WY...Sweetwater...Uinta.
In West Central WY...Lincoln...Sublette.
* WIND: West 10 to 20 mph with gusts up to 35 mph.
* HUMIDITY: As low as 8 percent. Humidity recovery each night will
remain below 40 percent.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Red Flag Warning means that critical fire weather conditions are
either occurring now....or will shortly. A combination of strong
winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.
&&
$$
WYZ288-081230-
/O.NEW.KRIW.FW.W.0021.260808T1700Z-260810T0300Z/
/O.CON.KRIW.FW.W.0020.000000T0000Z-260808T0300Z/
East Wind River Mountains/South Shoshone NF-
1227 PM MDT Fri Aug 7 2026
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...
...RED FLAG WARNING IN EFFECT FROM 11 AM SATURDAY TO 9 PM MDT
SUNDAY...
The National Weather Service in Riverton has issued a Red Flag
Warning, which is in effect from 11 AM Saturday to 9 PM MDT
Sunday.
* IMPACTS: Low Humidities and Strong Gusty Winds could cause
erratic fire behavior.
* AFFECTED AREA:
In Central WY...Fire Weather Zone 288.
* COUNTIES AFFECTED:
In Central WY...Fremont.
In West Central WY...Sublette.
* WIND: West 15 to 25 mph with gusts up to 40 mph.
* HUMIDITY: As low as 9 percent. Humidity recovery each night will
remain below 40 percent.
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.
&&
$$
WYZ140-275-276-280>283-285>287-300-081230-
/O.NEW.KRIW.FW.W.0021.260808T1700Z-260810T0300Z/
Yellowstone National Park-North Bighorn Basin/Worland BLM-
Cody Foothills-Natrona County/Casper BLM-Johnson County/Casper BLM-
South Bighorn Basin/Worland BLM-
Upper Wind River Basin/Wind River Basin-South Bighorn Mountains-
Absaroka Mountains/North Shoshone NF-Owl Creek Mountains-
Casper Mountain-
1227 PM MDT Fri Aug 7 2026
...RED FLAG WARNING IN EFFECT FROM 11 AM SATURDAY TO 9 PM MDT
SUNDAY...
The National Weather Service in Riverton has issued a Red Flag
Warning, which is in effect from 11 AM Saturday to 9 PM MDT
Sunday.
* IMPACTS: Low Humidities and Strong Gusty Winds could cause
erratic fire behavior.
* AFFECTED AREA:
In Central WY Fire Zones...280...283...285...300.
In North Central WY Fire Zones...275...276...281...282...287.
In Northwest WY Fire Zones...140...286.
* COUNTIES AFFECTED:
In Central WY...Fremont...Natrona.
In North Central WY...Big Horn...Hot Springs...Johnson...Park
Washakie.
In Northwest WY...Yellowstone National Park.
* WIND: Northwest 10 to 20 mph with gusts up to 30 mph.
* HUMIDITY: As low as 8 percent. Humidity recovery each night remains
below 40 percent.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Red Flag Warning means that critical fire weather conditions are
either occurring now....or will shortly. A combination of strong
winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.
&&
$$
http://weather.gov/riverton
Action: New Issued At: 2026-08-07 13:28:22
843
WWUS85 KRIW 071827
RFWRIW
URGENT - FIRE WEATHER MESSAGE
National Weather Service Riverton WY
1227 PM MDT Fri Aug 7 2026
WYZ277>279-289-081230-
/O.NEW.KRIW.FW.W.0021.260808T1700Z-260810T0300Z/
/O.CON.KRIW.FW.W.0020.000000T0000Z-260808T0300Z/
Lincoln and Uinta Counties/Lower Elevations-
Upper Green River Basin/Rock Springs BLM-
Sweetwater County/Rock Springs BLM/Flaming Gorge NRA-
Granite/Green/Ferris/Rattlesnake Mountains-
1227 PM MDT Fri Aug 7 2026
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...
...RED FLAG WARNING IN EFFECT FROM 11 AM SATURDAY TO 9 PM MDT
SUNDAY...
The National Weather Service in Riverton has issued a Red Flag
Warning, which is in effect from 11 AM Saturday to 9 PM MDT
Sunday.
* IMPACTS: Low Humidities and Strong Gusty Winds could cause
erratic fire behavior.
* AFFECTED AREA:
In Central WY Fire Zone....289.
In Southwest WY Fire Zones...277...279.
In West Central WY Fire Zone....278.
* COUNTIES AFFECTED:
In Central WY...Fremont...Natrona.
In Southwest WY...Sweetwater...Uinta.
In West Central WY...Lincoln...Sublette.
* WIND: West 10 to 20 mph with gusts up to 35 mph.
* HUMIDITY: As low as 8 percent. Humidity recovery each night will
remain below 40 percent.
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.
&&
$$
WYZ288-081230-
/O.NEW.KRIW.FW.W.0021.260808T1700Z-260810T0300Z/
/O.CON.KRIW.FW.W.0020.000000T0000Z-260808T0300Z/
East Wind River Mountains/South Shoshone NF-
1227 PM MDT Fri Aug 7 2026
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...
...RED FLAG WARNING IN EFFECT FROM 11 AM SATURDAY TO 9 PM MDT
SUNDAY...
The National Weather Service in Riverton has issued a Red Flag
Warning, which is in effect from 11 AM Saturday to 9 PM MDT
Sunday.
* IMPACTS: Low Humidities and Strong Gusty Winds could cause
erratic fire behavior.
* AFFECTED AREA:
In Central WY...Fire Weather Zone 288.
* COUNTIES AFFECTED:
In Central WY...Fremont.
In West Central WY...Sublette.
* WIND: West 15 to 25 mph with gusts up to 40 mph.
* HUMIDITY: As low as 9 percent. Humidity recovery each night will
remain below 40 percent.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Red Flag Warning means that critical fire weather conditions are
either occurring now....or will shortly. A combination of strong
winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.
&&
$$
WYZ140-275-276-280>283-285>287-300-081230-
/O.NEW.KRIW.FW.W.0021.260808T1700Z-260810T0300Z/
Yellowstone National Park-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-
Absaroka Mountains/North Shoshone NF-Owl Creek Mountains-
Casper Mountain-
1227 PM MDT Fri Aug 7 2026
...RED FLAG WARNING IN EFFECT FROM 11 AM SATURDAY TO 9 PM MDT
SUNDAY...
The National Weather Service in Riverton has issued a Red Flag
Warning, which is in effect from 11 AM Saturday to 9 PM MDT
Sunday.
* IMPACTS: Low Humidities and Strong Gusty Winds could cause
erratic fire behavior.
* AFFECTED AREA:
In Central WY Fire Zones...280...283...285...300.
In North Central WY Fire Zones...275...276...281...282...287.
In Northwest WY Fire Zones...140...286.
* COUNTIES AFFECTED:
In Central WY...Fremont...Natrona.
In North Central WY...Big Horn...Hot Springs...Johnson...Park
Washakie.
In Northwest WY...Yellowstone National Park.
* WIND: Northwest 10 to 20 mph with gusts up to 30 mph.
* HUMIDITY: As low as 8 percent. Humidity recovery each night remains
below 40 percent.
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.
&&
$$
http://weather.gov/riverton
Action: Continued Issued At: 2026-08-07 21:50:40 084 WWUS85 KRIW 080250 RFWRIW URGENT - FIRE WEATHER MESSAGE National Weather Service Riverton WY 850 PM MDT Fri Aug 7 2026 WYZ277>279-289-081300- /O.EXP.KRIW.FW.W.0020.000000T0000Z-260808T0300Z/ /O.CON.KRIW.FW.W.0021.260808T1700Z-260810T0300Z/ Lincoln and Uinta Counties/Lower Elevations- Upper Green River Basin/Rock Springs BLM- Sweetwater County/Rock Springs BLM/Flaming Gorge NRA- Granite/Green/Ferris/Rattlesnake Mountains- 850 PM MDT Fri Aug 7 2026 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM SATURDAY TO 9 PM MDT SUNDAY... * AFFECTED AREA: In Central WY Fire Zone....289. In Southwest WY Fire Zones...277...279. In West Central WY Fire Zone....278. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In Southwest WY...Sweetwater...Uinta. In West Central WY...Lincoln...Sublette. * IMPACTS: Low Humidities...Hot Temperatures...and Strong Gusty Winds could cause erratic fire behavior. * WIND: West 10 to 20 mph with gusts up to 35 mph. * HUMIDITY: As low as 8 percent. Humidity recovery each night will remain below 40 percent. * TEMPERATURES: Lows in the low 50s to low 60s. Highs in the upper 80s to upper 90s. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ WYZ288-081300- /O.EXP.KRIW.FW.W.0020.000000T0000Z-260808T0300Z/ /O.CON.KRIW.FW.W.0021.260808T1700Z-260810T0300Z/ East Wind River Mountains/South Shoshone NF- 850 PM MDT Fri Aug 7 2026 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM SATURDAY TO 9 PM MDT SUNDAY... * AFFECTED AREA: In Central WY...Fire Weather Zone 288. * COUNTIES AFFECTED: In Central WY...Fremont. In West Central WY...Sublette. * IMPACTS: Low Humidities...Hot Temperatures...and Strong Gusty Winds could cause erratic fire behavior. * WIND: West 10 to 20 mph with gusts up to 35 mph. * HUMIDITY: As low as 9 percent. Humidity recovery each night will remain below 40 percent. * TEMPERATURES: Lows in the upper 40s to low 60s. Highs in the low 60s to low 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. && $$ WYZ140-275-276-280>283-285>287-300-081300- /O.CON.KRIW.FW.W.0021.260808T1700Z-260810T0300Z/ Yellowstone National Park-North Bighorn Basin/Worland BLM- Cody Foothills-Natrona County/Casper BLM-Johnson County/Casper BLM- South Bighorn Basin/Worland BLM- Upper Wind River Basin/Wind River Basin-South Bighorn Mountains- Absaroka Mountains/North Shoshone NF-Owl Creek Mountains- Casper Mountain- 850 PM MDT Fri Aug 7 2026 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM SATURDAY TO 9 PM MDT SUNDAY... * AFFECTED AREA: In Central WY Fire Zones...280...283...285...300. In North Central WY Fire Zones...275...276...281...282...287. In Northwest WY Fire Zones...140...286. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In North Central WY...Big Horn...Hot Springs...Johnson...Park ...Washakie. In Northwest WY...Yellowstone National Park. * IMPACTS: Low Humidities...Hot Temperatures...and Strong Gusty Winds could cause erratic fire behavior. * WIND: Northwest 10 to 20 mph with gusts up to 30 mph. * HUMIDITY: As low as 8 percent. Humidity recovery each night will remain below 40 percent. * TEMPERATURES: Highs in the upper 70s to middle 80s at higher elevations and middle 90s to upper 90s at lower elevations. Lows in the upper 40s to upper 50s at higher elevations and upper 50s to low 60s at lower elevations. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ http://weather.gov/riverton Action: Continued Issued At: 2026-08-07 21:50:40 084 WWUS85 KRIW 080250 RFWRIW URGENT - FIRE WEATHER MESSAGE National Weather Service Riverton WY 850 PM MDT Fri Aug 7 2026 WYZ277>279-289-081300- /O.EXP.KRIW.FW.W.0020.000000T0000Z-260808T0300Z/ /O.CON.KRIW.FW.W.0021.260808T1700Z-260810T0300Z/ Lincoln and Uinta Counties/Lower Elevations- Upper Green River Basin/Rock Springs BLM- Sweetwater County/Rock Springs BLM/Flaming Gorge NRA- Granite/Green/Ferris/Rattlesnake Mountains- 850 PM MDT Fri Aug 7 2026 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM SATURDAY TO 9 PM MDT SUNDAY... * AFFECTED AREA: In Central WY Fire Zone....289. In Southwest WY Fire Zones...277...279. In West Central WY Fire Zone....278. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In Southwest WY...Sweetwater...Uinta. In West Central WY...Lincoln...Sublette. * IMPACTS: Low Humidities...Hot Temperatures...and Strong Gusty Winds could cause erratic fire behavior. * WIND: West 10 to 20 mph with gusts up to 35 mph. * HUMIDITY: As low as 8 percent. Humidity recovery each night will remain below 40 percent. * TEMPERATURES: Lows in the low 50s to low 60s. Highs in the upper 80s to upper 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. && $$ WYZ288-081300- /O.EXP.KRIW.FW.W.0020.000000T0000Z-260808T0300Z/ /O.CON.KRIW.FW.W.0021.260808T1700Z-260810T0300Z/ East Wind River Mountains/South Shoshone NF- 850 PM MDT Fri Aug 7 2026 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM SATURDAY TO 9 PM MDT SUNDAY... * AFFECTED AREA: In Central WY...Fire Weather Zone 288. * COUNTIES AFFECTED: In Central WY...Fremont. In West Central WY...Sublette. * IMPACTS: Low Humidities...Hot Temperatures...and Strong Gusty Winds could cause erratic fire behavior. * WIND: West 10 to 20 mph with gusts up to 35 mph. * HUMIDITY: As low as 9 percent. Humidity recovery each night will remain below 40 percent. * TEMPERATURES: Lows in the upper 40s to low 60s. Highs in the low 60s to low 80s. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ WYZ140-275-276-280>283-285>287-300-081300- /O.CON.KRIW.FW.W.0021.260808T1700Z-260810T0300Z/ Yellowstone National Park-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- Absaroka Mountains/North Shoshone NF-Owl Creek Mountains- Casper Mountain- 850 PM MDT Fri Aug 7 2026 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM SATURDAY TO 9 PM MDT SUNDAY... * AFFECTED AREA: In Central WY Fire Zones...280...283...285...300. In North Central WY Fire Zones...275...276...281...282...287. In Northwest WY Fire Zones...140...286. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In North Central WY...Big Horn...Hot Springs...Johnson...Park ...Washakie. In Northwest WY...Yellowstone National Park. * IMPACTS: Low Humidities...Hot Temperatures...and Strong Gusty Winds could cause erratic fire behavior. * WIND: Northwest 10 to 20 mph with gusts up to 30 mph. * HUMIDITY: As low as 8 percent. Humidity recovery each night will remain below 40 percent. * TEMPERATURES: Highs in the upper 70s to middle 80s at higher elevations and middle 90s to upper 90s at lower elevations. Lows in the upper 40s to upper 50s at higher elevations and upper 50s to low 60s at lower elevations. 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. && $$ http://weather.gov/riverton Action: Continued Issued At: 2026-08-07 21:50:40 084 WWUS85 KRIW 080250 RFWRIW URGENT - FIRE WEATHER MESSAGE National Weather Service Riverton WY 850 PM MDT Fri Aug 7 2026 WYZ277>279-289-081300- /O.EXP.KRIW.FW.W.0020.000000T0000Z-260808T0300Z/ /O.CON.KRIW.FW.W.0021.260808T1700Z-260810T0300Z/ Lincoln and Uinta Counties/Lower Elevations- Upper Green River Basin/Rock Springs BLM- Sweetwater County/Rock Springs BLM/Flaming Gorge NRA- Granite/Green/Ferris/Rattlesnake Mountains- 850 PM MDT Fri Aug 7 2026 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM SATURDAY TO 9 PM MDT SUNDAY... * AFFECTED AREA: In Central WY Fire Zone....289. In Southwest WY Fire Zones...277...279. In West Central WY Fire Zone....278. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In Southwest WY...Sweetwater...Uinta. In West Central WY...Lincoln...Sublette. * IMPACTS: Low Humidities...Hot Temperatures...and Strong Gusty Winds could cause erratic fire behavior. * WIND: West 10 to 20 mph with gusts up to 35 mph. * HUMIDITY: As low as 8 percent. Humidity recovery each night will remain below 40 percent. * TEMPERATURES: Lows in the low 50s to low 60s. Highs in the upper 80s to upper 90s. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ WYZ288-081300- /O.EXP.KRIW.FW.W.0020.000000T0000Z-260808T0300Z/ /O.CON.KRIW.FW.W.0021.260808T1700Z-260810T0300Z/ East Wind River Mountains/South Shoshone NF- 850 PM MDT Fri Aug 7 2026 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM SATURDAY TO 9 PM MDT SUNDAY... * AFFECTED AREA: In Central WY...Fire Weather Zone 288. * COUNTIES AFFECTED: In Central WY...Fremont. In West Central WY...Sublette. * IMPACTS: Low Humidities...Hot Temperatures...and Strong Gusty Winds could cause erratic fire behavior. * WIND: West 10 to 20 mph with gusts up to 35 mph. * HUMIDITY: As low as 9 percent. Humidity recovery each night will remain below 40 percent. * TEMPERATURES: Lows in the upper 40s to low 60s. Highs in the low 60s to low 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. && $$ WYZ140-275-276-280>283-285>287-300-081300- /O.CON.KRIW.FW.W.0021.260808T1700Z-260810T0300Z/ Yellowstone National Park-North Bighorn Basin/Worland BLM- Cody Foothills-Natrona County/Casper BLM-Johnson County/Casper BLM- South Bighorn Basin/Worland BLM- Upper Wind River Basin/Wind River Basin-South Bighorn Mountains- Absaroka Mountains/North Shoshone NF-Owl Creek Mountains- Casper Mountain- 850 PM MDT Fri Aug 7 2026 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM SATURDAY TO 9 PM MDT SUNDAY... * AFFECTED AREA: In Central WY Fire Zones...280...283...285...300. In North Central WY Fire Zones...275...276...281...282...287. In Northwest WY Fire Zones...140...286. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In North Central WY...Big Horn...Hot Springs...Johnson...Park ...Washakie. In Northwest WY...Yellowstone National Park. * IMPACTS: Low Humidities...Hot Temperatures...and Strong Gusty Winds could cause erratic fire behavior. * WIND: Northwest 10 to 20 mph with gusts up to 30 mph. * HUMIDITY: As low as 8 percent. Humidity recovery each night will remain below 40 percent. * TEMPERATURES: Highs in the upper 70s to middle 80s at higher elevations and middle 90s to upper 90s at lower elevations. Lows in the upper 40s to upper 50s at higher elevations and upper 50s to low 60s at lower elevations. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ http://weather.gov/riverton Action: Continued Issued At: 2026-08-08 01:34:15
776
WWUS85 KRIW 080633
RFWRIW
URGENT - FIRE WEATHER MESSAGE
National Weather Service Riverton WY
1233 AM MDT Sat Aug 8 2026
WYZ140-275>283-285>289-300-090000-
/O.CON.KRIW.FW.W.0021.260808T1700Z-260810T0300Z/
Yellowstone National Park-North Bighorn Basin/Worland BLM-
Cody Foothills-Lincoln and Uinta Counties/Lower Elevations-
Upper Green River Basin/Rock Springs BLM-
Sweetwater County/Rock Springs BLM/Flaming Gorge NRA-
Natrona County/Casper BLM-Johnson County/Casper BLM-
South Bighorn Basin/Worland BLM-
Upper Wind River Basin/Wind River Basin-South Bighorn Mountains-
Absaroka Mountains/North Shoshone NF-Owl Creek Mountains-
East Wind River Mountains/South Shoshone NF-
Granite/Green/Ferris/Rattlesnake Mountains-Casper Mountain-
1233 AM MDT Sat Aug 8 2026
...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO
9 PM MDT SUNDAY...
* AFFECTED AREA:
In Central WY Fire Zones...280...283...285...288...289...300.
In North Central WY Fire Zones...275...276...281...282...287.
In Northwest WY Fire Zones...140...286.
In Southwest WY Fire Zones...277...279.
In West Central WY Fire Zone....278.
* COUNTIES AFFECTED:
In Central WY...Fremont...Natrona.
In North Central WY...Big Horn...Hot Springs...Johnson...Park
Washakie.
In Northwest WY...Yellowstone National Park.
In Southwest WY...Sweetwater...Uinta.
In West Central WY...Lincoln...Sublette.
* IMPACTS: Low Humidities...Hot Temperatures...and Strong Gusty
Winds could cause erratic fire behavior.
* WIND: West 10 to 20 mph with gusts up to 35 mph.
* HUMIDITY: As low as 7 percent. Relative humidity recovery will be
poor on Saturday night.
* TEMPERATURES: Highs in the 90s in the lower elevations. Highs in
the 80s in the mountains.
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.
&&
$$
http://weather.gov/riverton
Action: Continued Issued At: 2026-08-08 12:38:05
455
WWUS85 KRIW 081737
RFWRIW
URGENT - FIRE WEATHER MESSAGE
National Weather Service Riverton WY
1137 AM MDT Sat Aug 8 2026
WYZ140-275>283-285>289-300-091200-
/O.CON.KRIW.FW.W.0021.000000T0000Z-260810T0300Z/
Yellowstone National Park-North Bighorn Basin/Worland BLM-
Cody Foothills-Lincoln and Uinta Counties/Lower Elevations-
Upper Green River Basin/Rock Springs BLM-
Sweetwater County/Rock Springs BLM/Flaming Gorge NRA-
Natrona County/Casper BLM-Johnson County/Casper BLM-
South Bighorn Basin/Worland BLM-
Upper Wind River Basin/Wind River Basin-South Bighorn Mountains-
Absaroka Mountains/North Shoshone NF-Owl Creek Mountains-
East Wind River Mountains/South Shoshone NF-
Granite/Green/Ferris/Rattlesnake Mountains-Casper Mountain-
1137 AM MDT Sat Aug 8 2026
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT SUNDAY...
* AFFECTED AREA:
In Central WY Fire Zones...280...283...285...288...289...300.
In North Central WY Fire Zones...275...276...281...282...287.
In Northwest WY Fire Zones...140...286.
In Southwest WY Fire Zones...277...279.
In West Central WY Fire Zone....278.
* COUNTIES AFFECTED:
In Central WY...Fremont...Natrona.
In North Central WY...Big Horn...Hot Springs...Johnson...Park
Washakie.
In Northwest WY...Yellowstone National Park.
In Southwest WY...Sweetwater...Uinta.
In West Central WY...Lincoln...Sublette.
* IMPACTS: Low Humidities and Strong Gusty Winds could cause
erratic fire behavior.
* WIND: West 10 to 20 mph with gusts up to 35 mph.
* HUMIDITY: As low as 7 percent. Humidity recovery will be poor
tonight.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Red Flag Warning means that critical fire weather conditions are
either occurring now....or will shortly. A combination of strong
winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.
&&
$$
http://weather.gov/riverton
Action: Continued Issued At: 2026-08-09 01:56:11
096
WWUS85 KRIW 090655
RFWRIW
URGENT - FIRE WEATHER MESSAGE
National Weather Service Riverton WY
1255 AM MDT Sun Aug 9 2026
WYZ140-275>283-285>289-300-100300-
/O.CON.KRIW.FW.W.0021.000000T0000Z-260810T0300Z/
Yellowstone National Park-North Bighorn Basin/Worland BLM-
Cody Foothills-Lincoln and Uinta Counties/Lower Elevations-
Upper Green River Basin/Rock Springs BLM-
Sweetwater County/Rock Springs BLM/Flaming Gorge NRA-
Natrona County/Casper BLM-Johnson County/Casper BLM-
South Bighorn Basin/Worland BLM-
Upper Wind River Basin/Wind River Basin-South Bighorn Mountains-
Absaroka Mountains/North Shoshone NF-Owl Creek Mountains-
East Wind River Mountains/South Shoshone NF-
Granite/Green/Ferris/Rattlesnake Mountains-Casper Mountain-
1255 AM MDT Sun Aug 9 2026
...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...
* AFFECTED AREA:
In Central WY Fire Zones...280...283...285...288...289...300.
In North Central WY Fire Zones...275...276...281...282...287.
In Northwest WY Fire Zones...140...286.
In Southwest WY Fire Zones...277...279.
In West Central WY Fire Zone....278.
* COUNTIES AFFECTED:
In Central WY...Fremont...Natrona.
In North Central WY...Big Horn...Hot Springs...Johnson...Park
Washakie.
In Northwest WY...Yellowstone National Park.
In Southwest WY...Sweetwater...Uinta.
In West Central WY...Lincoln...Sublette.
* IMPACTS: Low Humidities...Hot Temperatures...and Strong Gusty
Winds could cause erratic fire behavior.
* WIND: West 10 to 20 mph with gusts up to 30 mph.
* HUMIDITY: As low as 8 percent.
* TEMPERATURES: Highs in the 90s in the lower elevations. Highs in
the 80s in the mountains.
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.
&&
$$
http://weather.gov/riverton
Action: Expired Issued At: 2026-08-09 21:52:06 588 WWUS85 KRIW 100251 RFWRIW URGENT - FIRE WEATHER MESSAGE National Weather Service Riverton WY 851 PM MDT Sun Aug 9 2026 WYZ140-275>283-285>289-300-100400- /O.EXP.KRIW.FW.W.0021.000000T0000Z-260810T0300Z/ Yellowstone National Park-North Bighorn Basin/Worland BLM- Cody Foothills-Lincoln and Uinta Counties/Lower Elevations- Upper Green River Basin/Rock Springs BLM- Sweetwater County/Rock Springs BLM/Flaming Gorge NRA- Natrona County/Casper BLM-Johnson County/Casper BLM- South Bighorn Basin/Worland BLM- Upper Wind River Basin/Wind River Basin-South Bighorn Mountains- Absaroka Mountains/North Shoshone NF-Owl Creek Mountains- East Wind River Mountains/South Shoshone NF- Granite/Green/Ferris/Rattlesnake Mountains-Casper Mountain- 851 PM MDT Sun Aug 9 2026 ...RED FLAG WARNING WILL EXPIRE AT 9 PM MDT THIS EVENING... Winds have diminished in most locations even though relative humidity values hover around the critical mark but soon to recover some towards midnight and overnight in the 20 to 30 percent range with continued lighter winds. $$ http://weather.gov/riverton | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||