NWS Boise IDFF.W 0007August 15, 2026
Flash Flood Warning: Owyhee and Malheur, ID and OR
The National Weather Service office in Boise issued a flash flood warning for Owyhee and Malheur in Idaho, Oregon, which was in force until 4:45 p.m. local time on August 15. It was the 7th flash flood warning the NWS office in Boise issued in 2026. Idaho had 6 flash flood warnings in August 2026, against 7 in an average August of 2008-2025 (Idaho's flash flood warnings by year).
ExpiredWarning
In force for 2 hours; it has expired. The agency may have replaced it with a new notice.
The notice
- Issued by
- National Weather Service, Boise ID
- Area
- Owyhee and Malheur
- State
- Idaho
- Level
- Warning
- Issued
- 2:44 p.m. MDT, August 15, 2026
- Expires
- 4:45 p.m. MDT, August 15, 2026
- CAP severity, certainty, urgency
- Severe, Likely, Immediate
- VTEC event
- KBOI FF.W 0007
- 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
FFWBOI The National Weather Service in Boise has issued a * Flash Flood Warning for... The Big Grass Fire burn scar in... Southwestern Owyhee County in southwestern Idaho... Southeastern Malheur County in southeastern Oregon... * Until 445 PM MDT. * At 244 PM MDT, Doppler radar indicated thunderstorms producing heavy rain over the Big Grass Fire Burn Scar. Flash flooding is ongoing or expected to begin shortly. Excessive rainfall over the burn scar will result in debris flow. The debris flow can consist of rock, mud, vegetation and other loose materials. HAZARD...Flash flooding caused by thunderstorms in and around the Big Grass Fire Burn Scar. SOURCE...Radar indicated. IMPACT...Flooding of areas in and around the Big Grass Fire Burn Scar. * Some locations that will experience flash flooding include... Star Ranch, Castro Ranch, North Fork Owyhee Campground, Pole Creek Breaks, Brace Ranch, Hackberry Reservoir, Cutcher Crossing Launch Site, Twin Springs Ranch, Rickard Crossing, Three Forks River Access, Piute Basin Reservoir, Castro Ridge, Wiley Ranch, Piute Butte, Mouse Trap Butte, Four Corners, Garat Crossing Launch Site, Whitehorse Butte, Grassy Mountain and Juniper Basin Reservoir.
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 Grass Fire 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.