586
WGUS55 KBOI 270005
FFWBOI
IDC015-270300-
/O.NEW.KBOI.FF.W.0008.250827T0005Z-250827T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BOISE ID
605 PM MDT TUE AUG 26 2025
THE NATIONAL WEATHER SERVICE IN BOISE HAS ISSUED A
* FLASH FLOOD WARNING FOR...
EAST CENTRAL BOISE COUNTY IN SOUTHWESTERN IDAHO...
* UNTIL 900 PM MDT.
* AT 605 PM MDT, BOISE COUNTY LAW ENFORCEMENT REPORTED NUMEROUS 911
CALLS ABOUT ROCK SLIDES AND STANDING WATER ON IDAHO STATE HIGHWAY
21 BETWEEN LOWMAN AND GRANDJEAN. FLASH FLOODING IS ONGOING.
HAZARD...FLASH FLOODING CAUSED BY THUNDERSTORMS.
SOURCE...LAW ENFORCEMENT REPORTED.
IMPACT...FLASH FLOODING OF SMALL CREEKS AND STREAMS, AS WELL AS
OTHER POOR DRAINAGE AND LOW-LYING AREAS.
ROCK SLIDES WERE REPORTED ON IDAHO STATE HIGHWAY 21 AT MILEPOSTS 72
AND 76-77. THREE FEET OF WATER WAS REPORTED ON THE ROAD AT MILEPOST
80.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
STAY AWAY OR BE SWEPT AWAY. RIVER BANKS AND CULVERTS CAN BECOME
UNSTABLE AND UNSAFE.
IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE
POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO CROSS FLOODED
ROADS. FIND AN ALTERNATE ROUTE.
LAT...LON 4415 11528 4411 11535 4410 11545 4406 11551
4407 11559 4406 11562 4409 11563 4408 11556
4410 11548 4413 11542 4414 11533 4419 11526
4418 11525 4418 11524
FLASH FLOOD...OBSERVED
LC
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