An extremely strong Pacific cold front brought wind gusts in the 50 to 80 mph range with localized blizzard conditions in the mountains and then extremely cold wind chills followed behind an arctic cold frontal passage.   Snow amounts in the mountains were generally light and mainly in the 1 to 5 inch range but the combination with the wind brought many road closures to extreme eastern Idaho on the 21st into the 22nd.  Some school closures occurred on the 21st and 22nd.

Winter Storm in CENTENNIAL MOUNTAINS-ISLAND PARK, IDAHO
From 20-DEC-22 19:00:00 to 23-DEC-22 12:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Extreme winds caused widespread blowing and drifting snow with extensive road closures.  US Highway 20 was closed from Ashton to the Montana state line.   State Highway 87 was closed from US 20 to the Montana state line.   Fremont County School District 215 was closed on the 21st due to the road conditions.  Wind chill readings of -50 to -60 were recorded on the 22nd and 23d after the arctic frontal passage.

Winter Storm in TETON VALLEY, IDAHO
From 20-DEC-22 19:00:00 to 23-DEC-22 14:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Extremely strong winds gusting 60 to 70 mph at times brought widespread blowing and drifting snow.  US Highway 20 closed from Ashton to the Montana State Line.  State Highway 33 closed from Newdale to Tetonia and State Highway 32 closed from Tetonia to Ashton.   Fremont County School District 215 closed due to road conditions on the 21st.  Extreme cold wind chills of -35 to -45 were recorded on the 22nd behind the system.

Extreme Cold/Wind Chill in LOST RIVER VALLEYS, IDAHO
From 21-DEC-22 02:00:00 to 23-DEC-22 01:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Local Official

Strong northerly winds combined with sub zero temperatures to produce 40 to 50 below wind chills.   The Mackay School District closed schools on the 22nd due to the extreme cold conditions.

Extreme Cold/Wind Chill in BEAVERHEAD-LEMHI HIGHLANDS, IDAHO
From 21-DEC-22 16:00:00 to 23-DEC-22 06:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

An arctic cold frontal passage brought northerly winds 30 to 40 mph which produced wind chill temperatures in the -55 to -65 range during the overnight and early morning on the 21st and 22nd.

Blizzard in BEAR LAKE VALLEY, IDAHO
From 20-DEC-22 20:00:00 to 22-DEC-22 08:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Bern COOP observer reported blizzard conditions throughout the day on the 21st with zero visibility and 4.5 inches of snowfall.  Sustained winds of 30 to 40 mph with a peak gust of 69 mph at the site.

Winter Storm in UPPER SNAKE RIVER PLAIN, IDAHO
From 20-DEC-22 22:00:00 to 22-DEC-22 06:00:00 (MST-7)
Property damage: 1.50K
Crop damage: 0.00K
Reported by: Department of Highways

US Highway was closed from Ririe to Swan Valley on the 21st into the 22nd.  State Highway 33 was also closed from Newdale to Tetonia.  Wind gusts of 60 to 70 mph were measured on the 21st.  A car rolled on it's side the morning of the 21st near the Rexburg exit on US Highway 20.

Winter Storm in CARIBOU RANGE, IDAHO
From 20-DEC-22 20:00:00 to 23-DEC-22 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Only 1 to 2 inches of snow fell but widespread wind gusts in the 50 to 70 mph range created widespread blowing and drifting snow.   US Highway 26 between Ririe and Swan Valley was closed on the 21st into the 22nd as was state Highway 34 between Soda Springs and the Wyoming border.  Wind chill readings dropped to 20 and 30 below zero overnight on the 21st into the 22nd.

High Wind in SOUTHERN HILLS-ALBION MOUNTAINS, IDAHO
From 21-DEC-22 00:00:00 to 22-DEC-22 08:00:00 (MST-7)
Magnitude: 70.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

The Cotton Ridge RAWS site recorded an 80 mph wind gust at 8:17 AM on the 21st.  Gusts between 60 and 70 mph were widespread.

High Wind in MARSH AND ARBON HIGHLANDS, IDAHO
From 21-DEC-22 04:00:00 to 21-DEC-22 20:00:00 (MST-7)
Magnitude: 57.00 MG
Property damage: 12.00K
Crop damage: 0.00K
Reported by: Department of Highways

Widespread wind gusts of 50 to 70 mph on the 21st caused a truck to be tipped over on interstate 15 northbound near milepost 41 at 3:15 PM MST on the 21st.

High Wind in RAFT RIVER REGION, IDAHO
From 21-DEC-22 00:00:00 to 22-DEC-22 08:00:00 (MST-7)
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Widespread 60 to 70 mph gusts occurred on the 21st with 7  miles north northwest of Idahome measuring 66 mph at 7 AM MST.