487
WWUS85 KRIW 120254
RFWRIW
URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
854 PM MDT TUE AUG 11 2026
WYZ280-281-285-300-120400-
/O.EXP.KRIW.FW.W.0023.000000T0000Z-260812T0300Z/
NATRONA COUNTY/CASPER BLM-JOHNSON COUNTY/CASPER BLM-
SOUTH BIGHORN MOUNTAINS-CASPER MOUNTAIN-
854 PM MDT TUE AUG 11 2026
..RED FLAG WARNING WILL EXPIRE AT 9 PM MDT THIS EVENING
WINDS HAVE BEGAN TO DIMINISH AND RELATIVE HUMIDITIES WILL CONTINUE
TO INCREASE ABOVE CRITICAL VALUES ACROSS CENTRAL WYOMING, THUS THE
RED FLAG WARNING WILL BE ALLOWED TO EXPIRE AT 9PM.
WYZ283-287-289-120400-
/O.EXP.KRIW.FW.W.0023.000000T0000Z-260812T0300Z/
UPPER WIND RIVER BASIN/WIND RIVER BASIN-OWL CREEK MOUNTAINS-
GRANITE/GREEN/FERRIS/RATTLESNAKE MOUNTAINS-
854 PM MDT TUE AUG 11 2026
..RED FLAG WARNING WILL EXPIRE AT 9 PM MDT THIS EVENING
WINDS HAVE BEGAN TO DIMINISH AND RELATIVE HUMIDITIES WILL CONTINUE
TO INCREASE ABOVE CRITICAL VALUES ACROSS CENTRAL WYOMING, THUS THE
RED FLAG WARNING WILL BE ALLOWED TO EXPIRE AT 9PM.
WYZ140-286-120400-
/O.EXP.KRIW.FW.W.0023.000000T0000Z-260812T0300Z/
YELLOWSTONE NATIONAL PARK-ABSAROKA MOUNTAINS/NORTH SHOSHONE NF-
854 PM MDT TUE AUG 11 2026
..RED FLAG WARNING WILL EXPIRE AT 9 PM MDT THIS EVENING
WINDS HAVE BEGAN TO DIMINISH AND RELATIVE HUMIDITIES WILL CONTINUE
TO INCREASE ABOVE CRITICAL VALUES ACROSS NORTHERN WYOMING, THUS
THE RED FLAG WARNING WILL BE ALLOWED TO EXPIRE AT 9PM.
WYZ278-279-120400-
/O.EXP.KRIW.FW.W.0023.000000T0000Z-260812T0300Z/
UPPER GREEN RIVER BASIN/ROCK SPRINGS BLM-
SWEETWATER COUNTY/ROCK SPRINGS BLM/FLAMING GORGE NRA-
854 PM MDT TUE AUG 11 2026
..RED FLAG WARNING WILL EXPIRE AT 9 PM MDT THIS EVENING
WINDS HAVE BEGAN TO DIMINISH AND RELATIVE HUMIDITIES WILL CONTINUE
TO INCREASE ABOVE CRITICAL VALUES ACROSS CENTRAL AND SOUTHERN
WYOMING, THUS THE RED FLAG WARNING WILL BE ALLOWED TO EXPIRE AT
9PM.
HTTP://WEATHER.GOV/RIVERTON
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page