692 
WGUS55 KBOI 152044
FFWBOI
IDC073-ORC045-152245-
/O.NEW.KBOI.FF.W.0007.260815T2044Z-260815T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Boise ID
244 PM MDT Sat Aug 15 2026

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.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

LAT...LON 4265 11742 4288 11693 4291 11698 4281 11674
      4272 11669 4277 11694 4276 11694 4262 11705
      4261 11705 4263 11657 4261 11656 4259 11688
      4258 11689 4224 11640 4206 11641 4205 11642
      4205 11661 4225 11668 4223 11692 4240 11690

FLASH FLOOD...RADAR INDICATED

$$

491 
WGUS75 KBOI 152254
FFSBOI

Flash Flood Statement
National Weather Service Boise ID
454 PM MDT Sat Aug 15 2026

IDC073-ORC045-152304-
/O.EXP.KBOI.FF.W.0007.000000T0000Z-260815T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Owyhee ID-Malheur OR-
454 PM MDT Sat Aug 15 2026

...FLASH FLOOD WARNING FOR THE BIG GRASS FIRE BURN SCAR HAS EXPIRED
FOR SOUTHWESTERN OWYHEE AND SOUTHEASTERN MALHEUR COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.

&&

LAT...LON 4265 11742 4288 11693 4291 11698 4281 11674
      4272 11669 4277 11694 4276 11694 4262 11705
      4261 11705 4263 11657 4261 11656 4259 11688
      4258 11689 4224 11640 4206 11641 4205 11642
      4205 11661 4225 11668 4223 11692 4240 11690

$$

MC