646
WGUS65 KPIH 190032
FFAPIH

Flood Watch
National Weather Service Pocatello ID
632 PM MDT Fri Sep 18 2026

IDZ052>054-058>068-070>073-075-190145-
/O.CAN.KPIH.FA.A.0002.000000T0000Z-260919T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Arco/Mud Lake Desert-Upper Snake River Plain-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 Ashton, Malad, Edie School, Fort Hall, Grace,
Sun Valley, Arco, Island Park, Soda Springs, Picabo, Bone,
St. Anthony, American Falls, Emigration Summit, INL, Tetonia,
Craters of the Moon NM, Small, Henry, Lava Hot Springs, Howe, Mackay,
Galena, Preston, Georgetown, Mud Lake, Clayton, Stanley, Spencer,
Victor, Ketchum, Bellevue, Montpelier, Chilly, Challis, Kilgore,
Downey, Dubois, Idaho Falls, Blackfoot, Inkom, Rexburg,
Swan Valley, Driggs, Hailey, St. Charles, Wayan, Shelley,
Pocatello, McCammon, and Thatcher
632 PM MDT Fri Sep 18 2026

...FLOOD WATCH IS CANCELLED...

THE AREA WAS TOO STABLE TODAY WITH TOO MUCH CLOUD COVER EARLY IN THE
DAY. THUS, THUNDERSTORMS DIDN`T DEVELOP THE WAY MODELS SHOWED THAT
THEY WOULD. THERE WILL BE LIGHT SHOWERS OVERNIGHT ESPECIALLY ALONG
THE WYOMING BORDER, MONTANA DIVIDE AND THE NORTHERN CENTRAL
MOUNTAINS. AS THE UPPER LEVEL LOW THAT IS DIRECTLY OVERHEAD CURRENTLY
SHIFTS EAST OVERNIGHT INTO TOMORROW, LIGHT TO MODERATE SHOWERS ARE
POSSIBLE IN THE MORNING, ESPECIALLY THE EASTERN BENCHES OF THE SNAKE
PLAIN AND THE EASTERN HIGHLANDS ALONG THE WYOMING BORDER. MODELS SHOW
ISOLATE THUNDERSTORM DEVELOPMENT TOMORROW AFTERNOON MAINLY IN THE
MOUNTAINS ALONG THE EASTERN HIGHLANDS NEXT TO THE WYOMING BORDER.

The Flood Watch is cancelled for 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, Marsh and Arbon Highlands and Upper
Snake River Plain.

Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.

$$

TW