The continued push of Pacific moisture continued into the last 3 days of the month.   Periods of snow continued to the last day of December which was the 10th consecutive day with measurable snowfall in southeast Idaho.  Periods of very strong winds also accompanied the snow.  Roads were closed on both December 30th and 31st including interstate 84 as well as US Highway 20.

Winter Storm in BIG HOLE MOUNTAINS, IDAHO
From 29-DEC-21 21:00:00 to 31-DEC-21 23:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter measured 10.5 inches of snow 4 miles west of Victor.

Winter Storm in ARCO-MUD LAKE DESERT, IDAHO
From 29-DEC-21 20:00:00 to 31-DEC-21 21:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

US Highway 20 was closed from 17 miles east of Butte City to 2 miles west of Idaho Falls on the 30th.  Snowfall, strong winds with blowing and drifting snow and reduced visibility was the reason for the closing.

Winter Storm in BEAR LAKE VALLEY, IDAHO
From 29-DEC-21 20:00:00 to 31-DEC-21 23:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer in Bern measured 11 inches of snow on the 30th and 31st.

Winter Storm in BLACKFOOT MOUNTAINS, IDAHO
From 29-DEC-21 16:00:00 to 31-DEC-21 23:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer in Bone recorded 10 inches of snow the last 3 days of the month.

Winter Storm in CENTENNIAL MOUNTAINS-ISLAND PARK, IDAHO
From 29-DEC-21 16:00:00 to 31-DEC-21 23:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Idaho Highway 47 was closed from Ashton to 2 miles north of Warm River.   The COOP observer in Island Park measured 17 inches of snow through the last 3 days of the month.   Extensive blowing and drifting of snow was reported.

Winter Storm in EASTERN MAGIC VALLEY, IDAHO
From 29-DEC-21 21:00:00 to 31-DEC-21 23:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Interstate 84 was closed on the 31st from 10 miles east of Heyburn to the Utah border due to reduced visibility in blowing and drifting snow and snowfall.  Minidoka COOP reported 4 inches of snow on the 30th and 31st.

Winter Storm in FRANKLIN-EASTERN ONEIDA REGION, IDAHO
From 29-DEC-21 20:00:00 to 31-DEC-21 23:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The Malad City COOP observer reported 7 inches of snow on the 29th and 30th.

Winter Storm in LOWER SNAKE RIVER PLAIN, IDAHO
From 30-DEC-21 00:00:00 to 31-DEC-21 23:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Four to 7 inches of snow fell in the Pocatello/Chubbuck area on the 30th and 31st.

Winter Storm in MARSH AND ARBON HIGHLANDS, IDAHO
From 29-DEC-21 20:00:00 to 31-DEC-21 23:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The Inkom COOP observer reported 9 inches of snow on the 30th and 31st.

Winter Storm in RAFT RIVER REGION, IDAHO
From 29-DEC-21 20:00:00 to 31-DEC-21 23:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Interstate 84 was closed from 10 miles east of Heyburn to the Utah border due to snow and blowing and drifting snow reducing visibility on the 31st.

Winter Storm in SHOSHONE-LAVA BEDS, IDAHO
From 29-DEC-21 20:00:00 to 31-DEC-21 23:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The COOP observer at Richfield recorded 6 inches of snow on the 30st and 31st.

Winter Storm in TETON VALLEY, IDAHO
From 29-DEC-21 20:00:00 to 31-DEC-21 23:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Idaho Highway 47 was closed from Ashton to 2 miles north of Warm River. on the 30th   8 to 10 inches of snow was measured 8 miles north northeast of Tetonia with 7 inches in Driggs.

Winter Storm in UPPER SNAKE RIVER PLAIN, IDAHO
From 29-DEC-21 20:00:00 to 31-DEC-21 23:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Idaho Highway 33 was closed from Newdale to Tetonia and US Highway 20 was closed from 17 miles east of Butte City to 2 miles west of Idaho Falls on the 30th due to heavy snowfall and strong winds causing blowing and drifting snow with reduced visibility.   Snowfall amounts were the following:  7 inches 5 miles south southwest of Osgood, 5 inches Menan, 7 inches Rigby, 10 inches St Anthony, and 8 inches Sugar City.