Between late evening of February 8th and late morning of the 9th, an Arctic cold front moved from near the I-90 corridor in western and southwest Montana to a position extending southeastward from northwestern Idaho to east-central Idaho. Behind this front, a strong Arctic high pressure ridge settled southward across north-central and southwest Montana. This ridge was accompanied by a tight surface pressure gradient, especially over southwest Montana and along the Rocky Mountain Front. The tight pressure gradient resulted in breezy surface winds. In turn, the combination of these winds and frigid temperatures yielded warning-criteria wind chills for parts of the area.

Extreme Cold/Wind Chill in JEFFERSON, MONTANA
From 09-FEB-19 07:41:00 to 09-FEB-19 07:41:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Boulder Hill MT DOT station recorded wind chill of -41F with sustained wind of 16 mph. Location: 2-miles SE of Wickes.

Extreme Cold/Wind Chill in BLAINE, MONTANA
From 09-FEB-19 07:26:00 to 09-FEB-19 07:26:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Hays MT DOT station recorded -41F wind chill with sustained wind of 24 mph. Location: 3-miles WSW of Hays.

Extreme Cold/Wind Chill in TOOLE, MONTANA
From 09-FEB-19 07:21:00 to 09-FEB-19 07:21:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Sweet Grass MT DOT station recorded -41F wind chill with sustained wind of 16 mph. Location: 6-miles NNW of Sunburst.

Extreme Cold/Wind Chill in NORTH ROCKY MOUNTAIN FRONT, MONTANA
From 09-FEB-19 08:08:00 to 09-FEB-19 08:08:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Browning MT DOT station recorded -42F wind chill with sustained wind of 16 mph. Location: 2-miles SE of Browning.

Extreme Cold/Wind Chill in EASTERN GLACIER, MONTANA
From 09-FEB-19 07:56:00 to 09-FEB-19 07:56:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Cut Bank Airport ASOS recorded -42F wind chill with sustained wind of 21 mph. Location: 3-miles SW of Cut Bank.

Extreme Cold/Wind Chill in NORTH ROCKY MOUNTAIN FRONT, MONTANA
From 09-FEB-19 07:21:00 to 09-FEB-19 07:21:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Two Medicine Bridge MT DOT station recorded -42F wind chill with 14 mph sustained wind. Location: 1-mile ENE of East Glacier.

Extreme Cold/Wind Chill in SOUTHERN ROCKY MOUNTAIN FRONT, MONTANA
From 09-FEB-19 06:17:00 to 09-FEB-19 06:17:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Pendroy MT DOT station recorded -43F wind chill with 22 mph sustained wind. Location: 2-miles SW of Pendroy.

Extreme Cold/Wind Chill in SOUTHERN LEWIS AND CLARK, MONTANA
From 09-FEB-19 07:40:00 to 09-FEB-19 07:40:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

MacDonald Pass MT DOT station recorded -53F wind chill with 24 mph sustained wind. Location: 12-miles S of Marysville.

Extreme Cold/Wind Chill in LIBERTY, MONTANA
From 09-FEB-19 08:35:00 to 09-FEB-19 08:35:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Citizen Weather Observer Program (CWOP) station recorded wind chill of -41F accompanied by sustained wind of 25 mph. Location: 2-miles NNW of Joplin.