Over the week-long period of February 8-15, an arctic air mass settled over North-Central Montana, bringing one of the longest stretches of subzero temperatures in recorded history to the area (8 days at Great Falls, tied for 4th longest stretch). While winds were generally on the light side, they combined with the bitterly cold temperatures, resulting in wind chills below -40��F at times. These wind chills prompted Wind Chill Advisories and Wind Chill Warnings across the entire Great Falls County Warning Area. The core of the cold arrived for Wednesday through Friday, with air temperatures dropping to -30 or colder in some areas.

Cold/Wind Chill in EASTERN TETON, MONTANA
From 11-FEB-21 21:00:00 to 11-FEB-21 21:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

MCSCN Dahlman reports wind chill of -44.

Cold/Wind Chill in EASTERN PONDERA, MONTANA
From 11-FEB-21 21:00:00 to 11-FEB-21 21:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Conrad SCAN reports wind chill of -42.

Extreme Cold/Wind Chill in NORTH ROCKY MOUNTAIN FRONT, MONTANA
From 11-FEB-21 20:57:00 to 11-FEB-21 20:57:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

MT DOT Two Medicine Bridge sensor reports a wind chill of -46F.

Extreme Cold/Wind Chill in EASTERN GLACIER, MONTANA
From 11-FEB-21 21:00:00 to 11-FEB-21 21:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

KCTB asos reports wind chill of -48.

Extreme Cold/Wind Chill in CHOUTEAU, MONTANA
From 11-FEB-21 21:00:00 to 11-FEB-21 21:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

MT-meso Fort Benton reports wind chill of -43.

Extreme Cold/Wind Chill in HILL, MONTANA
From 11-FEB-21 21:00:00 to 11-FEB-21 21:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

KHVR asos reports wind chill of -47.

Cold/Wind Chill in BLAINE, MONTANA
From 11-FEB-21 20:18:00 to 11-FEB-21 20:18:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Ft. Belknap RAWS reports wind chill of -43.

Cold/Wind Chill in BEAVERHEAD, MONTANA
From 13-FEB-21 10:00:00 to 13-FEB-21 10:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Msonet station mtbhp big hole pass (mt dot) reports wind chill of -40.

Extreme Cold/Wind Chill in BLAINE, MONTANA
From 11-FEB-21 18:18:00 to 11-FEB-21 18:18:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station fblm8 fort belknap raws reports wind chill of -42.

Cold/Wind Chill in CASCADE, MONTANA
From 11-FEB-21 17:55:00 to 11-FEB-21 17:55:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Asos station kgtf great falls reports wind chill of -49.

Cold/Wind Chill in CASCADE, MONTANA
From 11-FEB-21 18:21:00 to 11-FEB-21 18:21:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station fw2944 belt reports wind chill of -42.

Cold/Wind Chill in FERGUS, MONTANA
From 11-FEB-21 17:58:00 to 11-FEB-21 17:58:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station k1mm moore reports wind chill of -50.

Cold/Wind Chill in FERGUS, MONTANA
From 11-FEB-21 18:05:00 to 11-FEB-21 18:05:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station mtlew lewistown divide (mt dot) reports wind chill of -48.

Cold/Wind Chill in HILL, MONTANA
From 13-FEB-21 19:30:00 to 13-FEB-21 19:30:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station dw0217 havre reports wind chill of -46.

Cold/Wind Chill in BEAVERHEAD, MONTANA
From 13-FEB-21 22:30:00 to 13-FEB-21 22:30:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station fw1664 hingham reports wind chill of -42.

Cold/Wind Chill in JUDITH BASIN, MONTANA
From 11-FEB-21 18:06:00 to 11-FEB-21 18:06:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station mtgys geyser (mt dot) reports wind chill of -48.

Cold/Wind Chill in JUDITH BASIN, MONTANA
From 11-FEB-21 17:58:00 to 11-FEB-21 17:58:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Awos station k1bm bravo reports a wind chill of -46.

Cold/Wind Chill in SOUTHERN LEWIS AND CLARK, MONTANA
From 11-FEB-21 17:56:00 to 11-FEB-21 17:56:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station mtmdp macdonald pass (mt dot) reports wind chill of -46.

Cold/Wind Chill in LIBERTY, MONTANA
From 11-FEB-21 18:15:00 to 11-FEB-21 18:15:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station ew9495 hill reports wind chill of -44.

Avalanche in LIBERTY, MONTANA
From 13-FEB-21 23:46:00 to 13-FEB-21 23:46:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station ew9427 chester-5nw reports wind chill of -44.

Cold/Wind Chill in MADISON, MONTANA
From 11-FEB-21 17:57:00 to 11-FEB-21 17:57:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station mtnor norris hill (mt dot) reports wind chill of -40.

Cold/Wind Chill in TOOLE, MONTANA
From 11-FEB-21 18:06:00 to 11-FEB-21 18:06:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station mtswt sweetgrass (mt dot) reports wind chill of -46.

Cold/Wind Chill in TOOLE, MONTANA
From 13-FEB-21 22:05:00 to 13-FEB-21 22:05:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station dw0975 kevin reports wind chill of -40.

Cold/Wind Chill in SOUTHERN ROCKY MOUNTAIN FRONT, MONTANA
From 11-FEB-21 20:59:00 to 11-FEB-21 20:59:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Pendroy MDOT sensor reports wind chill of -45.