A moist energetic Pacific storm system began to impact the northern Rockies Sunday afternoon and continued into Monday. The heaviest snowfall was across the mountains, but some valley locations picked up significant snowfall as the surface low pressure moved across western Montana.

Winter Storm in WEST GLACIER REGION, MONTANA
From 07-FEB-11 13:00:00 to 07-FEB-11 16:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy snow was reported northeast of Essex, with 9 inches measured.

Winter Storm in FLATHEAD/MISSION VALLEYS, MONTANA
From 06-FEB-11 20:00:00 to 07-FEB-11 07:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter in Bigfork reported 6 inches of snow.

Heavy Snow in MISSOULA / BITTERROOT VALLEYS, MONTANA
From 06-FEB-11 18:00:00 to 07-FEB-11 19:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Total snowfall at Missoula International airport was 12.4 inches, with 5 inches falling from 5pm to 7pm on the 7th.

Heavy Snow in MISSOULA / BITTERROOT VALLEYS, MONTANA
From 06-FEB-11 18:00:00 to 07-FEB-11 18:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Snowfall in the University district for the 24 hour period was measured at 11 inches. During that time 3 inches fell in 1 hour.

Winter Storm in MISSOULA / BITTERROOT VALLEYS, MONTANA
From 07-FEB-11 09:00:00 to 07-FEB-11 20:58:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Severe driving conditions were reported throughout the city of Missoula and Missoula county, including highway 93 from Missoula south to Lolo.

Winter Storm in POTOMAC / SEELEY LAKE REGION, MONTANA
From 06-FEB-11 16:00:00 to 07-FEB-11 17:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter 1 miles south of Condon reported 11 inches of snow over 24 hours.

Heavy Snow in POTOMAC / SEELEY LAKE REGION, MONTANA
From 06-FEB-11 16:00:00 to 07-FEB-11 17:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A report from the public 10 miles north of Seeley lake, estimated 15 inches of snow.

Winter Storm in FLATHEAD/MISSION VALLEYS, MONTANA
From 06-FEB-11 20:00:00 to 07-FEB-11 10:30:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The equipment at Glacier Park International Airport reported northeast winds between 18 to 22 mph from 1pm until 10 pm, along with gusts to 36 mph at 2pm. The fire hall measured 5 inches of snow.

Winter Storm in WEST GLACIER REGION, MONTANA
From 07-FEB-11 09:00:00 to 07-FEB-11 16:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Over Marias Pass the department of highways reported 8 inches of snowfall.

Winter Storm in POTOMAC / SEELEY LAKE REGION, MONTANA
From 07-FEB-11 13:01:00 to 07-FEB-11 19:05:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Severe driving conditions were reported on US-12 from Avon to MacDonald Pass. Chains were required for all towing units. Road conditions were snowpacked and icy, along with snow falling with blowing and drifting snow, resulted in reduced visibilities.