NWS Billings MTFF.W 0019September 18, 2026
Flash Flood Warning: Golden Valley and Sweet Grass, MT
The National Weather Service office in Billings issued a flash flood warning for Golden Valley and Sweet Grass in Montana, which was in force until 10:15 p.m. local time on September 18. It was the 19th flash flood warning the NWS office in Billings issued in 2026. Montana had 4 flash flood warnings in September 2026, against 1 in an average September of 2008-2025 (Montana's flash flood warnings by year).
ExpiredWarning
In force for 2.6 hours; it has expired. The agency may have replaced it with a new notice.
The notice
- Issued by
- National Weather Service, Billings MT
- Area
- Golden Valley and Sweet Grass
- State
- Montana
- Level
- Warning
- Issued
- 7:40 p.m. MDT, September 18, 2026
- Expires
- 10:15 p.m. MDT, September 18, 2026
- CAP severity, certainty, urgency
- Severe, Likely, Immediate
- VTEC event
- KBYZ FF.W 0019
- 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
FFWBYZ The National Weather Service in Billings has issued a * Flash Flood Warning for... Southwestern Golden Valley County in central Montana... Northeastern Sweet Grass County in south central Montana... * Until 1015 PM MDT. * At 740 PM MDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Between 1 and 2 inches of rain have fallen. The expected rainfall rate is 1 to 2 inches per hour. 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, highways, streets and underpasses as well as other poor drainage and low-lying areas. * Some locations that will experience flash flooding include... Mainly rural areas of Southwestern Golden Valley and Northeastern Sweet Grass Counties.
What the agency told people to do
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Do not drive on or attempt to cross flooded roads, find an alternate route. Roads and driveways may be damaged or washed out in places. Be especially cautious at night when it is harder to recognize the dangers of flooding.
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.