An intense mid-level wave developed rapidly on October 10-11 across the Northern Plains.  While initial conditions were quite mild with widespread rain and a few thunderstorms, the system managed to draw in some extremely cold air which allowed a changeover during October 10 and 11 as the post-frontal precipitation band developed back through areas from the James River valley westward.  The cyclone wrapped up and backed westward across northern Minnesota heading into October 12, wrapping the snow band across parts of southeast South Dakota as winds increased to a gusty 30 to 45 mph.

Winter Weather in MINER, SOUTH DAKOTA
From 11-OCT-19 03:00:00 to 12-OCT-19 21:00:00 (CST-6)
Reported by: COOP Observer

A light wintry mix changed to snow during the morning of October 11, and light to occasionally moderate snow over the following two days accumulated to 3 to 6 inches. Visibility dropped to 1 mile or less at times as snowfall totaled 5.8 inches at Howard.

Winter Weather in KINGSBURY, SOUTH DAKOTA
From 11-OCT-19 03:00:00 to 12-OCT-19 21:00:00 (CST-6)
Reported by: COOP Observer

A light wintry mix changed to snow during the morning of October 11, and light to occasionally moderate snow over the following two days accumulated to 3 to 7 inches. Visibility dropped to 1 mile or less at times as snowfall totaled 4.0 inches at De Smet and 7.0 inches at Iroquois.

Winter Weather in LAKE, SOUTH DAKOTA
From 11-OCT-19 00:00:00 to 12-OCT-19 18:00:00 (CST-6)
Reported by: COOP Observer

A light wintry mix changed to snow during the early morning of October 11, and light to occasionally moderate snow over the following two days accumulated to 2 to 4 inches. Visibility dropped to 1 mile or less at times as snowfall totaled 2.9 inches at Madison and 3.0 inches 2 miles south of Winfred.

Winter Weather in BROOKINGS, SOUTH DAKOTA
From 11-OCT-19 00:00:00 to 12-OCT-19 16:00:00 (CST-6)
Reported by: COOP Observer

A light wintry mix changed to snow during the early morning of October 11, and light to occasionally moderate snow over the following two days accumulated to 2 to 4 inches. Visibility dropped to 1 mile or less at times as snowfall totaled 3.5 inches 2 miles south-southeast of Astoria, 3.0 inches 4 miles northeast of Bruce, and 2.5 inches near Brookings.

Winter Weather in JERAULD, SOUTH DAKOTA
From 10-OCT-19 13:00:00 to 12-OCT-19 01:00:00 (CST-6)
Reported by: COOP Observer

A light wintry mix changed to snow during the midday of October 10, and light to occasionally moderate snow over the following two days accumulated to 2 to 5 inches. Visibility dropped to 1 mile or less at times as snowfall totaled 3.0 inches at Wessington Springs.

Winter Weather in BEADLE, SOUTH DAKOTA
From 10-OCT-19 13:00:00 to 12-OCT-19 21:00:00 (CST-6)
Reported by: Official NWS Observations

Rain changed to snow during the early afternoon of October 10, and light to occasionally moderate snow over the following two days accumulated to 3 to 7 inches. Visibility dropped to 1 mile or less at times from 0500-1400CST October 11, and again from 1000-1900CST October 12. Snowfall of 5.5 inches was measured at Huron over the period, with record snowfall for the date occurring each day from the 10th to the 12th.

Winter Weather in AURORA, SOUTH DAKOTA
From 10-OCT-19 08:00:00 to 11-OCT-19 12:00:00 (CST-6)
Reported by: COOP Observer

Light rainfall or a wintry mix changed to snow during the morning of October 10, with light to occasionally moderate snowfall through midday on October 11. Snowfall accumulated to 1 to 3 inches, with 2.0 inches at White Lake and 1.5 inches 4 miles southwest of Stickney.

Winter Weather in GREGORY, SOUTH DAKOTA
From 10-OCT-19 08:00:00 to 11-OCT-19 12:00:00 (CST-6)
Reported by: COOP Observer

Light rainfall changed to snow early morning on October 10, with light to occasionally moderate snowfall through the morning of October 11. Snowfall accumulated to 2 to 4 inches, with 3.0 inches 9 miles north of Gregory and 1.5 inches 4 miles southwest of Burke.

Winter Weather in BRULE, SOUTH DAKOTA
From 10-OCT-19 08:00:00 to 11-OCT-19 12:00:00 (CST-6)
Property damage: 5.00K
Crop damage: 0.00K
Reported by: COOP Observer

Light rainfall changed to snow early morning on October 10, with light to occasionally moderate snowfall through midday on October 11. Snowfall accumulated to 2 to 5 inches, with 4.5 inches 5 miles south southwest of Chamberlain and 3.1 inches at Chamberlain. At peak snowfall, accumulation on roadways created slick conditions with several minor accidents along Interstate 90. Property damage costs are rough estimates.