NWS Cheyenne WYFW.W 0043September 13, 2026
Red Flag Warning: Niobrara/Lower Elevations of Converse/Thunder Basin National Grassland, Southwest Carbon County and North Snowy Range Foothills, WY
The National Weather Service office in Cheyenne issued a red flag warning for Niobrara/Lower Elevations of Converse/Thunder Basin National Grassland, Southwest Carbon County and North Snowy Range Foothills in Wyoming, which was in force until 8:00 p.m. local time on September 14. It was the 43rd red flag warning the NWS office in Cheyenne 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, Cheyenne WY
- Area
- Niobrara/Lower Elevations of Converse/Thunder Basin National Grassland, Southwest Carbon County and North Snowy Range Foothills
- State
- Wyoming
- Level
- Warning
- Issued
- 12:57 p.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
- KCYS FW.W 0043
- 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 Cheyenne 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 The Fire Weather Watch is no longer in effect.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...Fire weather zones 417-423, 427, 432, and 433. * WIND...West to Northwest winds 20 to 40 mph, gusts between 45 to 60 mph. * HUMIDITY...Relative humidities as low as 10 to 20%. * IMPACTS...any fires that develop will likely spread rapidly. Outdoor burning is not recommended.
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.