NWS Pocatello IDFF.W 0013September 18, 2026
Flash Flood Warning: Jefferson and Madison, ID
The National Weather Service office in Pocatello issued a flash flood warning for Jefferson and Madison in Idaho, which was in force until 1:45 p.m. local time on September 18. It was the 13th 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 3 hours; it has expired. The agency may have replaced it with a new notice.
The notice
- Issued by
- National Weather Service, Pocatello ID
- Area
- Jefferson and Madison
- State
- Idaho
- Level
- Warning
- Issued
- 10:44 a.m. MDT, September 18, 2026
- Expires
- 1:45 p.m. MDT, September 18, 2026
- CAP severity, certainty, urgency
- Severe, Likely, Immediate
- VTEC event
- KPIH FF.W 0013
- 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... The Big Rock burn scar in... Southeastern Jefferson County in southeastern Idaho... South Central Madison County in southeastern Idaho... * Until 145 PM MDT. * At 1044 AM MDT, Doppler radar indicated thunderstorms producing heavy rain over the Big Rock Burn Scar. The expected rainfall rate is 0.5 to 1 inch in 1 hour. Already saturated and filled ditches and culverts could become quickly inundated. Flash flooding is ongoing or expected to begin shortly. Excessive rainfall over the burn scar will result in debris flow moving through the Big Rock burn scar. The debris flow can consist of rock, mud, vegetation and other loose materials. HAZARD...Life threatening flash flooding. Thunderstorms producing flash flooding in and around the Big Rock Burn Scar. SOURCE...Radar indicated. IMPACT...Life threatening flash flooding of areas in and around the Big Rock Burn Scar. * Some locations that will experience flash flooding include... Heise.
What the agency told people to do
This is a life threatening situation. Heavy rainfall will cause extensive and severe flash flooding of creeks...streams...and ditches in the Big Rock Burn Scar. Severe debris flows can also be anticipated across roads. Roads and driveways may be washed away in places. If you encounter flood waters...climb to safety.
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.