An extended period of Pacific moisture influx brought large amounts of moisture into southeast Idaho with continuous periods of light to moderate snowfall occasional strong winds.  The entire region was under advisories and warnings for the entire week overlapping the Christmas holiday.  Several roads closed on the 26th with heavy snow amounts and strong winds.

Winter Storm in MARSH AND ARBON HIGHLANDS, IDAHO
From 22-DEC-21 08:00:00 to 27-DEC-21 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Heavy snow fell with 11 inches in Inkom and 14 inches at Downey measured by the COOP observers.  17.5 inches was measured by the Cocorahs observer 3 miles north northwest of Lava Hot Springs.

Winter Storm in EASTERN MAGIC VALLEY, IDAHO
From 24-DEC-21 08:00:00 to 27-DEC-21 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Heavy snow and strong winds occurred over an extended period in the days surrounding the Christmas holiday.  The COOP observer at Minidoka measured 8 inches of snow with 6 on the 25th and 26th.  The Oakley COOP observer carried 16 inches of snow from the 25th through 27th.

Winter Storm in LOST RIVER VALLEYS, IDAHO
From 22-DEC-21 08:00:00 to 27-DEC-21 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

An extensive period of Pacific moisture influx caused periods of snow combined with strong winds to create very difficult travel conditions over several days surrounding the Christmas holiday .  The Chilly Barton Flat COOP site measured 8 inches of snow on the 26th and 27th.  US Highway 93 was closed from Carey to Arco on the 26th.

Winter Storm in SHOSHONE-LAVA BEDS, IDAHO
From 22-DEC-21 08:00:00 to 27-DEC-21 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

An extended period of Pacific moisture pushing into Idaho caused snow and periods of strong winds over and extended period covering the Christmas holiday.  The Richfield COOP observer reported 11 inches of snow with US Highway 93 closed from Carey to Arco on the 26th.

Winter Storm in SUN VALLEY REGION, IDAHO
From 22-DEC-21 08:00:00 to 27-DEC-21 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer measured 21 inches of snow at the Ketchum site over the 24th through 27th.

Winter Storm in TETON VALLEY, IDAHO
From 22-DEC-21 08:00:00 to 27-DEC-21 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Ten inches of snow was measured 3 miles north northeast of Driggs.  On the 26th US Highways 20 was closed from Ashton to the Montana border.  Idaho Highway 32 was closed from Ashton to Tetonia.  Idaho Highway 33 was closed from Newdale to Tetonia.

Winter Storm in UPPER SNAKE RIVER PLAIN, IDAHO
From 24-DEC-21 04:00:00 to 27-DEC-21 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A long period of snow and occasional strong winds surrounding the Christmas holiday brought difficult travel to the region.  Idaho Highway 33 was closed from Newdale to Tetonia.  US Highway 26 was closed from Ririe to Swan Valley.   The Idaho Falls COOP observer recorded 11 inches of snow from the 23rd to 27th.  9.4 inches fell in St Anthony.

Winter Weather in WOOD RIVER FOOTHILLS, IDAHO
From 22-DEC-21 08:00:00 to 27-DEC-21 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Extremely heavy snow fell in the Wood River Foothills.   Amounts recorded were the following:  Bellevue 25 inches, Hailey 23 inches, Picabo 21 inches.

Winter Storm in ARCO-MUD LAKE DESERT, IDAHO
From 22-DEC-21 08:00:00 to 27-DEC-21 23:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

An extended period of snow and wind closed US Highway 93 from Arco to Carey on December 26th.   Snow amounts in the extended period ranged from 2 to 10 inches.

Winter Storm in BEAVERHEAD-LEMHI HIGHLANDS, IDAHO
From 22-DEC-21 08:00:00 to 27-DEC-21 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

An extended period of Pacific moisture influx created high winds and snow over the several days surrounding the Christmas Holiday.   6 inches of snow fell in Dubois.   Interstate 15 was closed from Dubois to the Montana border on December 26th.

Heavy Snow in BEAR LAKE VALLEY, IDAHO
From 23-DEC-21 08:00:00 to 27-DEC-21 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer in Bern recorded 15 inches of snow with 12 inches on the 25th and 26th.

Winter Storm in BIG HOLE MOUNTAINS, IDAHO
From 22-DEC-21 20:00:00 to 27-DEC-21 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A long period of heavy snow and strong winds occurred in the Big Hole's.  Idaho Highway 33 was closed at Teton Pass on the 26th.   High elevations reported over a foot of snow.

Winter Storm in BLACKFOOT MOUNTAINS, IDAHO
From 22-DEC-21 08:00:00 to 27-DEC-21 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Several days of strong Pacific moisture influx brought heavy snow with periods of very strong winds over a 6 day period surrounding the Christmas holiday.  Travel was very difficult with Idaho Highway 34 closed from Soda Springs to the Wyoming border.  Soda Springs recorded 19 inches of snow and Bone recorded 14 inches of snow.

Winter Storm in CARIBOU RANGE, IDAHO
From 22-DEC-21 08:00:00 to 27-DEC-21 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A long period of Pacific moisture streamed into the region with strong winds and heavy snow.   Idaho highway 34 was closed from Soda Springs to the Wyoming border on the 26th and US Highway 26 was closed from Ririe to Swan Valley.   At least 60 motorists were stranded in Swan Valley on the 26th due to the road closure.   Swan Valley received 7 inches of snow.

Winter Storm in CENTENNIAL MOUNTAINS-ISLAND PARK, IDAHO
From 22-DEC-21 08:00:00 to 27-DEC-21 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A long period of snow and and periods of strong winds over several days surrounding the Christmas holiday  brought extreme travel difficulties.  Idaho Highway 47 from Ashton to Warm River, Idaho Highway 87 from Island Park to the Montana border, US Highway from Ashton to the Montana border were all closed on December 26th.  The Island Park COOP observer recorded 24 inches of snow from the 24th through 27th.