956 
WGUS65 KPIH 180852
FFAPIH

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Pocatello ID
252 AM MDT Fri Sep 18 2026

IDZ053-190400-
/O.NEW.KPIH.FF.A.0007.260918T0852Z-260919T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Upper Snake River Plain-
Including the cities of Idaho Falls, Rexburg, and St. Anthony
252 AM MDT Fri Sep 18 2026

...FLASH FLOOD WATCH FOR THE BIG ROCK BURN SCAR IN EFFECT THROUGH
THIS EVENING...

* WHAT...Flash flooding and debris flows caused by excessive rainfall
  are possible over the Big Rock burn scar.

* WHERE...A portion of southeast Idaho, including the following area,
  Upper Snake River Plain.

* WHEN...Through this evening.

* IMPACTS...Heavy rainfall over the Big Rock burn scar is expected
  during the period of the watch. Anyone in or near the Big Rock burn
  scar should prepare for potential debris flow moving through the
  Big Rock burn scar. Be sure to stay up to date with information
  from local authorities. Heavy rainfall could trigger flash flooding
  and debris flows in and near recent wildfire burn scars.

* ADDITIONAL DETAILS...
  - National Weather Service Meteorologists are forecasting heavy
    rainfall over the Big Rock burn scar, which may lead to flash
    flooding and debris flows.
  - Some locations that may experience flash flooding include...
    Heise.
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

13

257 
WGUS65 KPIH 181630
FFAPIH

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Pocatello ID
1030 AM MDT Fri Sep 18 2026

IDZ053-190600-
/O.CAN.KPIH.FF.A.0007.000000T0000Z-260919T0400Z/
/O.NEW.KPIH.FA.A.0002.260918T1630Z-260919T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Upper Snake River Plain-
Including the cities of Rexburg, Idaho Falls, and St. Anthony
1030 AM MDT Fri Sep 18 2026

...FLASH FLOOD WATCH FOR THE BIG ROCK BURN SCAR IS BEING EXPANDED...

The Flash Flood Watch for the Big Rock burn scar is being replaced
with a more broad Flash Flood Watch across eastern Idaho.

&&

...FLASH FLOOD WATCH IN EFFECT THROUGH THIS EVENING...

* WHAT...Flash flooding caused by excessive rainfall is possible.

* WHERE...A portion of southeast Idaho, including the following area,
  Upper Snake River Plain.

* WHEN...Through this evening.

* IMPACTS...Excessive runoff may result in flooding of rivers,
  creeks, streams, and other low-lying and flood-prone locations.
  Flooding may occur in poor drainage and urban areas. Storm drains
  and ditches may become clogged with debris.

* ADDITIONAL DETAILS...
  - Heavy rainfall from thunderstorms is expected through this
    evening across eastern Idaho. Rainfall amounts in excess of 0.50"
    are possible, leading to flooding within burn scars, steep
    terrain, and urban areas.
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

IDZ052-054-058>068-070>073-075-190600-
/O.NEW.KPIH.FA.A.0002.260918T1630Z-260919T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Arco/Mud Lake Desert-Lower Snake River Plain-Marsh and Arbon
Highlands-Franklin/Eastern Oneida Region-Bear River Range-Bear
Lake Valley-Blackfoot Mountains-Caribou Range-Big Hole Mountains-
Teton Valley-Centennial Mountains - Island Park-Beaverhead -
Lemhi Highlands-Lost River Valley-Challis/Pahsimeroi Valleys-
Frank Church Wilderness-Sawtooth/Stanley Basin-Sun Valley Region-
Wood River Foothills-
Including the cities of Montpelier, Craters of the Moon NM, Shelley,
Downey, Tetonia, Chilly, Arco, Malad, Victor, Emigration Summit,
Grace, Stanley, INL, Challis, Kilgore, Blackfoot, Spencer, Dubois,
Georgetown, Lava Hot Springs, American Falls, Preston, Small, Fort
Hall, Galena, Driggs, Soda Springs, McCammon, Island Park, Clayton,
Bellevue, Picabo, Sun Valley, Mud
Lake, Pocatello, St. Charles, Bone, Henry, Howe, Ashton, Wayan,
Mackay, Thatcher, Hailey, Swan Valley, Inkom, Ketchum, and Edie
School
1030 AM MDT Fri Sep 18 2026

...FLASH FLOOD WATCH IN EFFECT THROUGH THIS EVENING...

* WHAT...Flash flooding caused by excessive rainfall is possible.

* WHERE...Portions of central, eastern, and southeast Idaho,
  including the following areas, in central Idaho, Challis/Pahsimeroi
  Valleys, Frank Church Wilderness, Lost River Valley,
  Sawtooth/Stanley Basin, Sun Valley Region and Wood River Foothills.
  In eastern Idaho, Beaverhead - Lemhi Highlands, Big Hole Mountains,
  Centennial Mountains - Island Park and Teton Valley. In southeast
  Idaho, Arco/Mud Lake Desert, Bear Lake Valley, Bear River Range,
  Blackfoot Mountains, Caribou Range, Franklin/Eastern Oneida Region,
  Lower Snake River Plain and Marsh and Arbon Highlands.

* WHEN...Through this evening.

* IMPACTS...Excessive runoff may result in flooding of rivers,
  creeks, streams, and other low-lying and flood-prone locations.
  Flooding may occur in poor drainage and urban areas. Storm drains
  and ditches may become clogged with debris.

* ADDITIONAL DETAILS...
  - Heavy rainfall from thunderstorms is expected through this
    evening across central and eastern Idaho. Rainfall amounts in
    excess of 0.50" are possible, leading to flooding within burn
    scars, steep terrain, and urban areas.
  - http://www.weather.gov/safety/flood

PRECAUTIONARY/PREPAREDNESS ACTIONS...

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

JKeyes