Low pressure intensified on December 10 as it moved from the lee of the central Rockies into the Great Lakes.  A strong frontogenetic band developed ahead of the system, with weak instability present which resulted in a narrow and more intense band across parts of southeast South Dakota.  Snowfall from 6 to 11 inches was common along the axis of the band from south central South Dakota toward the Sioux Falls area.

Winter Storm in BON HOMME, SOUTH DAKOTA
From 10-DEC-21 09:00:00 to 10-DEC-21 22:00:00 (CST-6)
Reported by: COOP Observer

Snowfall was moderate to heavy at times between 1100-1700CST, and produced dangerous travel conditions. Snowfall totaled 6.2 inches at Tyndall.

Winter Storm in YANKTON, SOUTH DAKOTA
From 10-DEC-21 10:00:00 to 10-DEC-21 22:00:00 (CST-6)
Reported by: COOP Observer

Snowfall was moderate to heavy at times between 1100-1600CST, and produced dangerous travel conditions. Snowfall totaled 6.0 inches at Yankton.

Winter Weather in JERAULD, SOUTH DAKOTA
From 10-DEC-21 06:30:00 to 10-DEC-21 20:30:00 (CST-6)
Reported by: COOP Observer

Snowfall was moderate to briefly heavy at times between 1100-1600CST, and produced dangerous travel conditions. Snowfall totaled 4.0 inches at Wessington Springs.

Winter Weather in KINGSBURY, SOUTH DAKOTA
From 10-DEC-21 08:30:00 to 10-DEC-21 22:00:00 (CST-6)
Reported by: COOP Observer

Snowfall was moderate to briefly heavy at times between 1200-1700CST, and produced dangerous travel conditions. Snowfall totaled 5.5 inches 9 miles south southwest of Arlington.

Winter Storm in MOODY, SOUTH DAKOTA
From 10-DEC-21 06:00:00 to 10-DEC-21 22:30:00 (CST-6)
Reported by: COOP Observer

Snowfall was moderate to heavy at times between 1000-1700CST, and produced treacherous travel conditions. Snowfall totaled 7.5 inches at Flandreau.

Winter Storm in MINNEHAHA, SOUTH DAKOTA
From 10-DEC-21 04:00:00 to 10-DEC-21 22:30:00 (CST-6)
Reported by: COOP Observer

Snowfall was moderate to heavy at times between 0900-1800CST, and produced treacherous travel conditions. Snowfall reached from 8 to 12 inches around the Sioux Falls metro area and included 11.8 inches in southeast parts of Sioux Falls, 11.0 inches 4 miles south southeast of Garretson, and 8.2 inches at Colton.

Winter Weather in MINER, SOUTH DAKOTA
From 10-DEC-21 06:00:00 to 10-DEC-21 21:00:00 (CST-6)
Reported by: COOP Observer

Snowfall was moderate to briefly heavy at times between 1100-1600CST, and produced dangerous travel conditions. Snowfall totaled 5.0 inches at Howard.

Winter Storm in TURNER, SOUTH DAKOTA
From 10-DEC-21 09:00:00 to 10-DEC-21 23:00:00 (CST-6)
Reported by: COOP Observer

Snowfall was moderate to heavy at times between 1100-1700CST, and produced treacherous travel conditions. Snowfall totaled 10.9 inches at Hurley and 7.8 inches at Marion.

Winter Storm in LINCOLN, SOUTH DAKOTA
From 10-DEC-21 09:00:00 to 10-DEC-21 23:00:00 (CST-6)
Reported by: COOP Observer

Snowfall was moderate to heavy at times between 1000-1700CST, and produced treacherous travel conditions. Snowfall totaled 11.0 inches 1 mile southeast of Tea, 10.1 inches in southern Sioux Falls, and 9.7 inches in Canton.

Winter Weather in UNION, SOUTH DAKOTA
From 10-DEC-21 10:00:00 to 11-DEC-21 00:00:00 (CST-6)
Reported by: COOP Observer

Snowfall was moderate to briefly heavy at times between 1300-1700CST, and produced dangerous travel conditions. Snowfall totaled 5.0 inches at Beresford and 2.3 inches 6 miles north northeast of Elk Point.

Winter Weather in SANBORN, SOUTH DAKOTA
From 10-DEC-21 06:00:00 to 10-DEC-21 21:00:00 (CST-6)
Reported by: COOP Observer

Snowfall was moderate to briefly heavy at times between 1100-1600CST, and produced dangerous travel conditions. Snowfall totaled 5.0 inches near Forestburg and 4.5 inches at Woonsocket.

Winter Storm in CHARLES MIX, SOUTH DAKOTA
From 10-DEC-21 01:00:00 to 10-DEC-21 21:30:00 (CST-6)
Reported by: COOP Observer

Snowfall was moderate to heavy at times between 0500-1400CST, and produced treacherous travel conditions. Snowfall totaled 11.0 inches near Academy and 9.0 inches at Platte.

Winter Storm in DOUGLAS, SOUTH DAKOTA
From 10-DEC-21 02:00:00 to 10-DEC-21 21:30:00 (CST-6)
Reported by: CoCoRaHS

Snowfall was moderate to heavy at times between 0600-1500CST, and produced treacherous travel conditions. Snowfall totaled 10.0 inches 5 miles west of Armour, 7.3 inches 7 miles west southwest of Parkston, and 7.0 inches 10 miles west of Dimock.

Winter Storm in HANSON, SOUTH DAKOTA
From 10-DEC-21 03:30:00 to 10-DEC-21 22:00:00 (CST-6)
Reported by: CoCoRaHS

Snowfall was moderate to heavy at times between 0800-1600CST, and produced treacherous travel conditions. Snowfall totaled 8.6 inches near Alexandria.

Winter Storm in CLAY, SOUTH DAKOTA
From 10-DEC-21 11:30:00 to 10-DEC-21 23:30:00 (CST-6)
Reported by: COOP Observer

Snowfall was moderate to heavy at times between 1200-1700CST, and produced dangerous travel conditions. Snowfall totaled 6.0 inches 5 miles southeast of Centerville.

Winter Storm in MCCOOK, SOUTH DAKOTA
From 10-DEC-21 03:30:00 to 10-DEC-21 22:00:00 (CST-6)
Reported by: COOP Observer

Snowfall was moderate to heavy at times between 0800-1600CST, and produced treacherous travel conditions. Snowfall totaled 8.0 inches 6 miles northwest of Montrose and at Bridgewater, and 7.2 inches 5 miles northeast of Salem.

Winter Storm in GREGORY, SOUTH DAKOTA
From 10-DEC-21 00:00:00 to 10-DEC-21 20:30:00 (CST-6)
Reported by: COOP Observer

Snowfall was moderate to heavy at times between 0300-1200CST, and produced treacherous travel conditions. Snowfall totaled 11.5 inches at Gregory, 10.0 inches 9 miles north of Gregory, 9.0 inches 4 miles southwest of Burke, and 8.8 inches at Bonesteel.

Winter Storm in DAVISON, SOUTH DAKOTA
From 10-DEC-21 04:00:00 to 10-DEC-21 21:00:00 (CST-6)
Reported by: COOP Observer

Snowfall was moderate to heavy at times between 0800-1600CST, and produced treacherous travel conditions. Snowfall totaled 9.4 inches 1 mile south southeast of Mitchell and 8.3 inches at Mitchell.

Winter Storm in AURORA, SOUTH DAKOTA
From 10-DEC-21 04:00:00 to 10-DEC-21 20:30:00 (CST-6)
Reported by: COOP Observer

Snowfall was moderate to heavy at times between 0800-1600CST, and produced treacherous travel conditions. Snowfall totaled 8.8 inches at White Lake and 8.0 inches 4 miles southwest of Stickney.

Winter Weather in BROOKINGS, SOUTH DAKOTA
From 10-DEC-21 09:00:00 to 10-DEC-21 21:00:00 (CST-6)
Reported by: COOP Observer

Snowfall was moderate to briefly heavy at times between 1200-1700CST, and produced dangerous travel conditions. Snowfall totaled 5.4 inches at Brookings and 4.0 inches 2 miles south southeast of Astoria.

Winter Storm in BRULE, SOUTH DAKOTA
From 10-DEC-21 03:30:00 to 10-DEC-21 19:00:00 (CST-6)
Reported by: COOP Observer

Snowfall was moderate to heavy at times between 0530-1100CST, and produced treacherous travel conditions. Snowfall totaled 7.8 inches 5 miles south of Chamberlain and 7.5 inches at Pukwana.

Winter Storm in HUTCHINSON, SOUTH DAKOTA
From 10-DEC-21 02:00:00 to 10-DEC-21 22:30:00 (CST-6)
Reported by: COOP Observer

Snowfall was moderate to heavy at times between 0700-1600CST, and produced treacherous travel conditions. Snowfall totaled 10.5 inches at Tripp, 7.0 inches at Menno, and 6.0 inches at Parkston.

Winter Storm in LAKE, SOUTH DAKOTA
From 10-DEC-21 07:00:00 to 10-DEC-21 21:00:00 (CST-6)
Reported by: COOP Observer

Snowfall was moderate to heavy at times between 1100-1700CST, and produced treacherous travel conditions. Snowfall totaled 6.2 inches at Madison and 6.0 inches 2 miles south of Winfred.