The combination snow and blowing snow brought winter storm conditions to most of the area except for Garfield and Petroleum counties.

Winter Storm in NORTHERN VALLEY, MONTANA
From 17-FEB-11 00:00:00 to 17-FEB-11 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotters reported about 4 inches of new snow with 20 to 35 mph winds and visibilities less than 1/2 mile.

Winter Storm in DANIELS, MONTANA
From 17-FEB-11 05:00:00 to 17-FEB-11 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotters reported 4 to 5 inches of new snow and strong winds. This created whiteout conditions in places.

Winter Storm in SHERIDAN, MONTANA
From 17-FEB-11 05:00:00 to 17-FEB-11 18:47:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Generally 4 inches of new snow fell across the area combined with 30 to 40 mph winds. Whiteout conditions were also observed.

Winter Storm in EASTERN ROOSEVELT, MONTANA
From 17-FEB-11 08:00:00 to 17-FEB-11 18:47:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Several inches of new snow combined with winds of 20 to 40 mph brought visibilities below a 1/2 a mile.

Winter Storm in MCCONE, MONTANA
From 17-FEB-11 05:00:00 to 17-FEB-11 17:45:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Several inches of new snow combined with winds of 20 to 40 mph brought visibilities below a 1/2 a mile.

Winter Storm in PRAIRIE, MONTANA
From 17-FEB-11 08:00:00 to 17-FEB-11 17:45:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Several inches of new snow combined with winds of 20 to 40 mph brought visibilities below a 1/2 a mile. Whiteout conditions were also reported.

Winter Storm in RICHLAND, MONTANA
From 17-FEB-11 08:00:00 to 17-FEB-11 18:45:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several inches of new snow combined with winds of 20 to 40 mph brought visibilities below a 1/2 a mile across the county.

Winter Storm in DAWSON, MONTANA
From 17-FEB-11 05:00:00 to 17-FEB-11 17:45:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Several inches of new snow combined with winds of 20 to 40 mph brought visibilities below a 1/2 a mile across the county.

Winter Storm in WIBAUX, MONTANA
From 17-FEB-11 05:00:00 to 17-FEB-11 17:45:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Several inches of new snow combined with winds of 20 to 40 mph brought visibilities below a 1/2 a mile across the county.

Winter Storm in CENTRAL AND SOUTHERN VALLEY, MONTANA
From 17-FEB-11 05:00:00 to 17-FEB-11 19:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Three to five inches of new snow fell while winds of 20 to 30 mph created extreme drifting and blowing.

Winter Storm in WESTERN ROOSEVELT, MONTANA
From 17-FEB-11 08:00:00 to 17-FEB-11 17:45:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Two inches of snow combined with the loose snow and winds of 25 to over 35 mph made for dangerous conditions with visibilities less than 1/2 a mile and significant drifting.