Winter Storm Warnings
December 18 2025
* WHAT...West winds 25 to 35 mph with gusts up to 55 mph.
* WHERE...Big Lost Highlands/Copper Basin, Frank Church Wilderness,
Lost River Range, Sawtooth/Stanley Basin, Sun Valley Region, and
Big Hole Mountains.
* WHEN...Until 11 PM MST this evening.
* IMPACTS...Travel will be difficult, especially for high profile
vehicles. Isolated damage to trees, powerlines, signs, and
outbuildings is expected, along with isolated power outages. Loose
outdoor objects will be blown around.
* WHAT...Southwest winds 30 to 40 mph with gusts up to 65 mph
possible. Highest wind gusts are likely across the eastern Magic
Valley, Snake River Plain, the INL and across the Lava Beds
towards Craters of the Moon.
* WHERE...Challis/Pahsimeroi Valleys, Lost River Valley, Wood River
Foothills, Teton Valley, Eastern Magic Valley, Shoshone/Lava Beds,
Arco/Mud Lake Desert, Blackfoot Mountains, Lower Snake River
Plain, Marsh and Arbon Highlands, Raft River Region, Southern
Hills/Albion Mountains, and Upper Snake River Plain.
* WHEN...Until 11 PM MST this evening.
* IMPACTS...Travel will be difficult, especially for high profile
vehicles. Isolated damage to trees, powerlines, signs, and
outbuildings is expected, along with isolated power outages. Loose
outdoor objects will be blown around.
* WHAT...West winds 20 to 30 mph with gusts up to 50 mph.
* WHERE...Beaverhead - Lemhi Highlands and Centennial Mountains -
Island Park.
* WHEN...Until 11 PM MST this evening.
* IMPACTS...Travel will be difficult, especially for high profile
vehicles. Isolated damage to trees, powerlines, signs, and
outbuildings is expected, along with isolated power outages.
Loose outdoor objects will be blown around.
