NWS Riverton WYFW.W 0025September 3, 2026
Red Flag Warning: North Bighorn Basin/Worland BLM, Cody Foothills, Natrona County/Casper BLM and 7 more, MT and WY
The National Weather Service office in Riverton issued a red flag warning for North Bighorn Basin/Worland BLM, Cody Foothills, Natrona County/Casper BLM and 7 more in Montana, Wyoming, which was in force until 9:00 p.m. local time on September 4. It was the 25th red flag warning the NWS office in Riverton issued in 2026. Montana had 9 red flag warnings in September 2026, against 9 in an average September of 2008-2025 (Montana'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
- North Bighorn Basin/Worland BLM, Cody Foothills, Natrona County/Casper BLM and 7 more
- State
- Montana
- Level
- Warning
- Issued
- 11:12 a.m. MDT, September 3, 2026
- In force from
- 12:00 p.m. MDT, September 4, 2026
- Expires
- 9:00 p.m. MDT, September 4, 2026
- CAP severity, certainty, urgency
- Severe, Likely, Expected
- VTEC event
- KRIW FW.W 0025
- 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 Friday. * IMPACTS: Low Humidities...Unseasonably Warm Temperatures...and Strong Gusty Winds could cause erratic fire behavior. * AFFECTED AREA: In Central WY Fire Zones...280...283...285...289. In North Central WY Fire Zones...275...276...281...282...287. In Northwest WY Fire Zone....286. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In North Central WY...Big Horn...Hot Springs...Johnson...Park Washakie. In Southwest WY...Sweetwater. * WIND: Southwest 15 to 25 mph with gusts up to 30 to 40 mph. * HUMIDITY: As low as 10 to 15 percent. * TEMPERATURES: Highs in the 80s. Lows in the 50s.
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.