NWS Pocatello IDFF.W 0014September 18, 2026
Flash Flood Warning: Blaine, Butte and Custer, ID
The National Weather Service office in Pocatello issued a flash flood warning for Blaine, Butte and Custer in Idaho, which was in force until 4:30 p.m. local time on September 18. It was the 14th flash flood warning the NWS office in Pocatello issued in 2026. Idaho had 10 flash flood warnings in September 2026, against 3 in an average September of 2008-2025 (Idaho's flash flood warnings by year).
ExpiredWarning
In force for 2.9 hours; it has expired. The agency may have replaced it with a new notice.
The notice
- Issued by
- National Weather Service, Pocatello ID
- Area
- Blaine, Butte and Custer
- State
- Idaho
- Level
- Warning
- Issued
- 1:37 p.m. MDT, September 18, 2026
- Expires
- 4:30 p.m. MDT, September 18, 2026
- CAP severity, certainty, urgency
- Severe, Likely, Immediate
- VTEC event
- KPIH FF.W 0014
- 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
FFWPIH The National Weather Service in Pocatello has issued a * Flash Flood Warning for... Northeastern Blaine County in central Idaho... Southeastern Custer County in central Idaho... Southwestern Butte County in southeastern Idaho... * Until 430 PM MDT. * At 137 PM MDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Rainfall rates exceeding 0.5 inches in 1 hour are indicated.. 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 involving step terrain. Rockfall is also possible. * Some locations that will experience flash flooding include... Grouse.
What the agency told people to do
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. In hilly terrain there are low water crossings which are potentially dangerous in heavy rain. Do not attempt to cross flooded roads. Find an alternate route. Flooding is occurring or is imminent. It is important to know where you are relative to streams, rivers, or creeks which can become killers in heavy rains. Campers and hikers should avoid streams or creeks.
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.