NWS Riverton WYFF.W 0003September 19, 2026
Flash Flood Warning: Fremont, WY
The National Weather Service office in Riverton issued a flash flood warning for Fremont in Wyoming, which was in force until 9:30 p.m. local time on September 19. It was the 3rd flash flood warning the NWS office in Riverton issued in 2026. Wyoming had 1 flash flood warning in September 2026, against 1 in an average September of 2008-2025 (Wyoming's flash flood warnings by year).
ExpiredWarning
In force for 3.1 hours; it has expired. The agency may have replaced it with a new notice.
The notice
- Issued by
- National Weather Service, Riverton WY
- Area
- Fremont
- State
- Wyoming
- Level
- Warning
- Issued
- 6:25 p.m. MDT, September 19, 2026
- Expires
- 9:30 p.m. MDT, September 19, 2026
- CAP severity, certainty, urgency
- Severe, Likely, Immediate
- VTEC event
- KRIW FF.W 0003
- 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
FFWRIW The National Weather Service in Riverton has issued a * Flash Flood Warning for... Southern Fremont County in central Wyoming... * Until 930 PM MDT. * At 625 PM MDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 2 and 3 inches of rain have fallen. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding caused by thunderstorms. SOURCE...Radar indicated. IMPACT...Flash flooding of small creeks and streams, as well as other poor drainage and low-lying areas. * Some locations that will experience flash flooding include... Mainly rural areas of Southern Fremont County. This includes the following streams and drainages... Little Popo Agie River, Grant Young Ditch, Monument Draw, North Fork Ballenger Draw, Popo Agie River and Government Draw.
What the agency told people to do
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads. Please report observed flooding to local emergency services or law enforcement and request they pass this information to the National Weather Service when you can do so safely.
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.