192
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
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