NWS Riverton WYFW.W 0027September 9, 2026
Red Flag Warning: Absaroka Mountains/North Shoshone NF, Owl Creek Mountains and East Wind River Mountains/South Shoshone NF, WY
The National Weather Service office in Riverton issued a red flag warning for Absaroka Mountains/North Shoshone NF, Owl Creek Mountains and East Wind River Mountains/South Shoshone NF in Wyoming, which was in force until 9:00 p.m. local time on September 10. It was the 27th red flag warning the NWS office in Riverton issued in 2026. Wyoming had 16 red flag warnings in September 2026, against 16 in an average September of 2008-2025 (Wyoming's red flag warnings by year).
ExpiredWarning
In force for 9 hours; it has expired. The agency may have replaced it with a new notice.
The notice
- Issued by
- National Weather Service, Riverton WY
- Area
- Absaroka Mountains/North Shoshone NF, Owl Creek Mountains and East Wind River Mountains/South Shoshone NF
- State
- Wyoming
- Level
- Warning
- Issued
- 12:58 p.m. MDT, September 9, 2026
- In force from
- 12:00 p.m. MDT, September 10, 2026
- Expires
- 9:00 p.m. MDT, September 10, 2026
- CAP severity, certainty, urgency
- Severe, Likely, Expected
- VTEC event
- KRIW FW.W 0027
- Official source
- National Weather Service: the notice at its source
Source: National Weather Service: the notice at its source. AreaZine rebuilds this page from the agency's record; the agency's page is the one to act on. A U.S. Government work, in the public domain.
The notice as issued
The National Weather Service in Riverton has issued a Red Flag Warning, which is in effect from noon to 9 PM MDT Thursday. * AFFECTED AREA: In Central WY Fire Zone....288. In North Central WY Fire Zone....287. In Northwest WY Fire Zone....286. * COUNTIES AFFECTED: In Central WY...Fremont. In North Central WY...Hot Springs...Park. In West Central WY...Sublette. * IMPACTS: Low Humidities and Strong Gusty Winds could cause erratic fire behavior. * WIND: West 10 to 20 mph with gusts up to 30 to 35 mph. * HUMIDITY: As low as 12 to 15 percent, especially at elevations below 10,000 feet. RH recovery will be poor at elevations below 9,000 feet.
What the agency told people to do
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.
Source: National Weather Service: the notice at its source. The text is the agency's, unedited. A U.S. Government work, in the public domain.