300 
WGUS55 KBOI 182347
FFWBOI
IDC015-190215-
/O.NEW.KBOI.FF.W.0013.260918T2347Z-260919T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Boise ID
547 PM MDT Fri Sep 18 2026

The National Weather Service in Boise has issued a

* Flash Flood Warning for...
  The Wapiti Burn Area in...
  Northeastern Boise County in southwestern Idaho...

* Until 815 PM MDT.

* At 547 PM MDT, emergency management reported thunderstorms
  producing heavy rain over the Wapiti Burn Area. Flash flooding is
  ongoing or expected to begin shortly. Excessive rainfall over the
  burn scar will result in debris flow moving through the High
  Drainage Test. The debris flow can consist of rock, mud, vegetation
  and other loose materials.

  HAZARD...Life threatening flash flooding and debris flows in and
           around the Wapiti Fire Burn Scar.

  SOURCE...Emergency management reported debris on Idaho State
           Highway 21 between mileposts 103 and 105.

  IMPACT...Life threatening flash flooding and debris flows in and
           around the Wapiti Fire Burn Scar will impact Grandjean
           Road and Highway 21 from east of Lowman to Banner Summit.

* Some locations that will experience flash flooding include...
  Grandjean.

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 Wapiti Burn Area. 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 4425 11532 4428 11533 4432 11529 4429 11524
      4431 11522 4428 11520 4429 11517 4420 11517
      4419 11513 4415 11508 4416 11506 4412 11507
      4411 11504 4409 11504 4406 11514 4410 11517
      4409 11524 4414 11531 4414 11536 4416 11537

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

LC

334 
WGUS75 KBOI 190145
FFSBOI

Flash Flood Statement
National Weather Service Boise ID
745 PM MDT Fri Sep 18 2026

IDC015-190155-
/O.CAN.KBOI.FF.W.0013.000000T0000Z-260919T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Boise ID-
745 PM MDT Fri Sep 18 2026

...FLASH FLOOD WARNING FOR THE WAPITI BURN AREA IS CANCELLED FOR
NORTHEASTERN BOISE COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a
threat. As of 735 PM MDT Idaho State Comms reports that mud and rocks
on Idaho Highway 21 between mileposts 103 and 105 have been cleared
from the roadway.  Please continue to heed remaining road closures.

A Flash Flood Watch remains in effect until 1200 AM MDT for portions
of south central and southwest Idaho.

&&

LAT...LON 4432 11529 4429 11524 4431 11522 4428 11520
      4428 11517 4420 11517 4419 11513 4415 11508
      4416 11506 4412 11507 4411 11504 4409 11504
      4406 11514 4410 11517 4409 11524 4414 11531
      4414 11536 4416 11537 4425 11532 4428 11533

$$

LC