540
WGUS55 KBOI 181749
FFWBOI
IDC039-182000-
/O.NEW.KBOI.FF.W.0011.260918T1749Z-260918T2000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BOISE ID
1149 AM MDT FRI SEP 18 2026
THE NATIONAL WEATHER SERVICE IN BOISE HAS ISSUED A
* FLASH FLOOD WARNING FOR...
THE MM115 HWY 20 BURN SCAR IN...
CENTRAL ELMORE COUNTY IN SOUTHWESTERN IDAHO...
* UNTIL 200 PM MDT.
* AT 1149 AM MDT, DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
HEAVY RAIN OVER THE MM115 HWY 20 BURN SCAR. THE EXPECTED RAINFALL
RATE IS 0.25 TO 0.75 INCHES IN 1 HOUR. 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
MM115 HWY 20 BURN SCAR.
SOURCE...RADAR INDICATED.
IMPACT...FLOODING OF AREAS IN AND AROUND THE MM115 HWY 20 BURN
SCAR.
* SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE...
MAINLY RURAL AREAS OF CENTRAL ELMORE COUNTY.
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 MM115 HWY 20 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 4327 11541 4328 11541 4328 11544 4331 11544
4331 11540 4330 11540 4330 11539 4329 11539
4329 11538 4328 11538 4328 11533 4327 11533
4327 11534 4326 11536 4326 11538 4327 11538
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...0.25-0.75 INCHES IN 1 HOUR
JDS
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