A slow moving storm dumped more than a foot of snow in parts of the Upper Midwest.
The storm began in the northern Rockies, and moved eastward across South Dakota the morning of Saturday, December 8th. An old frontal boundary that lied across the central Plains, lifted northward and developed into an inverted trough across the Mississippi River Valley that afternoon. This inverted trough and the merging of the storm system across South Dakota, provided the energy and moisture to cause a significant winter storm across the Upper Midwest.
The heaviest snowfall totals occurred along Highway 212 from near Montevideo in west-central Minnesota, eastward across the Twin Cities, and into portions of west-central Wisconsin.
One of the heavier snowfall event occurred during the mid morning/early afternoon time period where the center of the storm system moved from southwest Minnesota to west-central Wisconsin. Several areas of southwest and west-central Minnesota had snowfall rates of 1 to 2 inches per hour. These bands of heavier snowfall moved eastward into west-central Wisconsin during the afternoon hours.  Locally 8 to 16 inches fell across Polk, Dunn, Pierce, St. Croix, Chippewa and Eau Claire counties. Lower amounts occurred in Barron and Rusk counties.

Winter Storm in EAU CLAIRE, WISCONSIN
From 09-DEC-12 04:00:00 to 09-DEC-12 22:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snow developed across the county during the early morning of Sunday, December 9th. The snow became heavier toward morning, with heavier bands of snow between 11 am and 4 pm. By the early evening, totals ranged from 10 to 14 inches across the county.

Winter Storm in PEPIN, WISCONSIN
From 09-DEC-12 03:00:00 to 09-DEC-12 22:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snow developed across the county during the early morning of Sunday, December 9th. The snow became heavier toward morning, with heavier bands of snow between 9 am and 3 pm. By the early evening, totals ranged from 8 to 12 inches across the county.

Winter Storm in PIERCE, WISCONSIN
From 09-DEC-12 02:00:00 to 09-DEC-12 22:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snow developed across the county during the early morning of Sunday, December 9th. The snow became heavier toward morning, with heavier bands of snow between 11 am and 3 pm. By the early evening, totals ranged from 10 to 14 inches across the county.

Winter Storm in POLK, WISCONSIN
From 09-DEC-12 02:00:00 to 09-DEC-12 22:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snow developed across the county during the early morning of Sunday, December 9th. The snow became heavier toward morning, with heavier bands of snow between 8 am and 3 pm. By the early evening, totals ranged from 8 to 16 inches across the county.

Winter Storm in ST. CROIX, WISCONSIN
From 09-DEC-12 02:00:00 to 09-DEC-12 22:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snow developed across the county during the early morning of Sunday, December 9th. The snow became heavier toward morning, with heavier bands of snow between 8 am and 3 pm. By the early evening, totals ranged from 10 to 17 inches across the county.

Winter Storm in BARRON, WISCONSIN
From 09-DEC-12 03:00:00 to 09-DEC-12 22:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snow developed across the county during the early morning of Sunday, December 9th. The snow became heavier toward morning, and by the early evening, totals ranged from 6 to 8 inches across the county.

Winter Storm in CHIPPEWA, WISCONSIN
From 09-DEC-12 04:00:00 to 09-DEC-12 22:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snow developed across the county during the early morning of Sunday, December 9th. The snow became heavier toward morning, with heavier bands of snow between 11 am and 4 pm. By the early evening, totals ranged from 10 to 14 inches across the southwestern part of the county.

Winter Storm in DUNN, WISCONSIN
From 09-DEC-12 03:00:00 to 09-DEC-12 22:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snow developed across the county during the early morning of Sunday, December 9th. The snow became heavier toward morning, with heavier bands of snow between 11 am and 3 pm. By the early evening, totals ranged from 10 to 16 inches across the county.

Winter Storm in RUSK, WISCONSIN
From 09-DEC-12 04:00:00 to 09-DEC-12 22:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snow developed across the county during the early morning of Sunday, December 9th. The heaviest snowfall was confined to the far western part of the county. Some heavier bursts of snow during the late morning allowed for isolated totals of 5 to 8 inches in the southwest portion of the county by early evening.