Flash Flood Warning — Boise County, Idaho

🌊 Active: Flash Flood Warning

Flash Flood Warning issued August 15 at 7:02PM MDT until August 15 at 9:00PM MDT by NWS Boise ID

FFWBOI The National Weather Service in Boise has issued a * Flash Flood Warning for... The Wapiti Fire burn scar in... Northeastern Boise County in southwestern Idaho... * Until 900 PM MDT. * At 702 PM MDT, Doppler radar indicated thunderstorms producing heavy rain over the Wapiti Fire Burn Scar. Up to 0.2 inches of rain have fallen. The expected rainfall rate is 0.5 to 1 inch in 1 hour. Additional rainfall amounts of 0.5 to 1 inch are possible in the warned area. 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 Wapiti Fire Burn Scar. SOURCE...Radar indicated. IMPACT...Flooding of areas in and around the Wapiti Fire Burn Scar. * Some locations that will experience flash flooding include... Grandjean.

Effective August 15, 2026 at 9:02 PM ET · Expires August 15, 2026 at 11:00 PM ET

📋 Official NWS Guidance

This is a life threatening situation. Heavy rainfall will cause extensive and severe flash flooding of creeks...streams...and ditches in the Wapiti 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. Move away from recently burned areas. Life-threatening flooding of creeks, roads and normally dry washes is likely. The heavy rains will likely trigger rockslides, mudslides and debris flows in steep terrain, especially in and around these areas.