The Winter Storm that brought over a foot of snow across portions of the southern, and eastern Twin Cities metro area, and into adjacent west-central Wisconsin, was a classic Colorado Low storm. Warnings were issued Thursday morning and had nearly 24 hours of lead time before the heaviest snowfall began across the state.
During the morning of Friday, December 10, an area of low pressure had developed across eastern Colorado. By the afternoon, and early evening, the storm moved across Kansas, and into northern Missouri. By Saturday morning, this storm system moved over the Great Lakes region. Light snow started to develop as early as Friday morning across far southern Minnesota. Regional radar noted a very elongated band of higher reflectivity over southern Minnesota that steadily moved northward Friday morning. This band was associated with strong upward mid-level forcing that remained nearly stationary across the southern part of the Twin Cities metro area, and into west central Wisconsin for several hours. As moisture from the main storm system moved northward into southern Minnesota Friday evening, snowfall rates intensified. Locally, snowfall rates were 1 to 2 inches per hour, with isolated higher rates. Snowfall totals by the time it tapered off, were approaching 21 inches.
Outside of this intense band of snowfall, this storm system brought widespread light snow to the area with accumulations ranging from a few inches up to a foot and a half of fresh snow. The heaviest snowfall was observed from the southwest to eastern Twin Cities metro, with amounts drastically decreasing as you moved into the northern Twin Cities.
Schools closed early due to anticipated snowfall with several businesses closing early over the south metro. The timing of the event led to numerous travel impacts, as some of the most intense snow fell during the Friday evening commute. Roadways quickly became snow covered, with reduced visibility due to intense snowfall rates.
Some of the higher snowfall totals that occurred during this event included;
18.0 inches near Hudson, Roberts, and Cameron.
14.0-16.0 inches near Baldwin, Boyceville, and Clear Lake.

Winter Storm in PEPIN, WISCONSIN
From 10-DEC-21 12:00:00 to 11-DEC-21 04:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Light snow developed early Friday afternoon. Several bands of light to occasional moderate snowfall occurred in the afternoon, and through the late evening. The snowfall tapered off Saturday morning. Total snowfall amounts across the county averaged between 9 to 11 inches.

Winter Storm in PIERCE, WISCONSIN
From 10-DEC-21 12:00:00 to 11-DEC-21 04:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Light snow developed early Friday afternoon. A band of heavy snowfall developed during the afternoon and evening over northern Pierce County with snowfall rates as high as 1 inch per hour. The heaviest snowfall began to taper off late Friday evening. Total snowfall amounts across the county averaged between 9 to 11 inches, with locally a foot near the St. Croix and Pierce county line.

Winter Storm in ST. CROIX, WISCONSIN
From 10-DEC-21 12:30:00 to 11-DEC-21 04:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Light snow developed early Friday afternoon. A band of heavy snowfall developed during the mid afternoon and evening with snowfall rates as high as 1-2 inches per hour. The heaviest snowfall began to taper off late Friday evening. Total snowfall amounts across the county averaged between 12 to 18 inches for the southern 3/4 of the county. Slightly lesser amounts were across the far north.

Winter Storm in DUNN, WISCONSIN
From 10-DEC-21 13:30:00 to 11-DEC-21 04:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Light snow developed early Friday afternoon. During the mid afternoon, through the mid evening, occasional light to moderate snow fell. Total snowfall amounts across the county averaged between 10 to 13 inches.

Winter Storm in POLK, WISCONSIN
From 10-DEC-21 14:00:00 to 11-DEC-21 04:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Light snow developed Friday afternoon. The heaviest snowfall occurred in the southern quarter of the county where locally 6 to 8 inches fell. Northern Polk County had snowfall amounts around 3-5 inches.

Winter Storm in BARRON, WISCONSIN
From 10-DEC-21 14:30:00 to 11-DEC-21 05:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Light snow developed Friday afternoon. The heaviest snow fell over the southeast quarter of the county where locally 8 to 11 inches fell. Northwest Barron County averaged around 4-6 inches of snow before tapering off early Saturday morning.

Winter Storm in EAU CLAIRE, WISCONSIN
From 10-DEC-21 13:30:00 to 11-DEC-21 05:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Light snow developed early Friday afternoon. During the mid afternoon, through the mid evening, occasional light to moderate snow fell. Total snowfall amounts across the county averaged between 8 to 11 inches.

Winter Storm in CHIPPEWA, WISCONSIN
From 10-DEC-21 14:00:00 to 11-DEC-21 05:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Light snow developed Friday afternoon. During the mid afternoon, through the mid evening, occasional light to moderate snow fell. Total snowfall amounts across the county averaged between 9 to 11 inches.

Winter Storm in RUSK, WISCONSIN
From 10-DEC-21 14:30:00 to 11-DEC-21 06:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Light snow developed Friday afternoon. During the late afternoon, through the mid evening, occasional light to moderate snow fell. Total snowfall amounts across the county averaged between 9 to 11 inches. Lesser amounts were noted in the far northwest part of the county where locally 4-7 inches of snow fell.