NWS Riverton WYFW.W 0028September 13, 2026
Red Flag Warning: Sweetwater County/Rock Springs BLM/Flaming Gorge NRA, Natrona County/Casper BLM, Upper Wind River Basin/Wind River Basin and 2 more, WY
The National Weather Service office in Riverton issued a red flag warning for Sweetwater County/Rock Springs BLM/Flaming Gorge NRA, Natrona County/Casper BLM, Upper Wind River Basin/Wind River Basin and 2 more in Wyoming, which was in force until 8:00 p.m. local time on September 14. It was the 28th 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 8 hours; it has expired. The agency may have replaced it with a new notice.
The notice
- Issued by
- National Weather Service, Riverton WY
- Area
- Sweetwater County/Rock Springs BLM/Flaming Gorge NRA, Natrona County/Casper BLM, Upper Wind River Basin/Wind River Basin and 2 more
- State
- Wyoming
- Level
- Warning
- Issued
- 10:03 a.m. MDT, September 13, 2026
- In force from
- 12:00 p.m. MDT, September 14, 2026
- Expires
- 8:00 p.m. MDT, September 14, 2026
- CAP severity, certainty, urgency
- Severe, Likely, Expected
- VTEC event
- KRIW FW.W 0028
- 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 8 PM MDT Monday. the Fire Weather Watch is no longer in effect. * AFFECTED AREA: In Central WY Fire Zones...280...283...289...300. In Southwest WY Fire Zone....279. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In Southwest WY...Sweetwater. * IMPACTS: Low Humidities and Strong Gusty Winds could cause erratic fire behavior. * WIND: West 20 to 30 mph with gusts up to 40 to 50 mph. * HUMIDITY: As low as 10 to 15 percent.
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.