Mid-level frontogenesis across southeast South Dakota in the presence of instability aloft allowed for scattered showers to transition into a band of moderate to briefly heavy snowfall during the morning which lasted into the evening before tapering off.
Every event with a place to put it; 11 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS FSD wrote it up.
Mid-level frontogenesis across southeast South Dakota in the presence of instability aloft allowed for scattered showers to transition into a band of moderate to briefly heavy snowfall during the morning which lasted into the evening before tapering off.
The national radar mosaic for the moment the first event began.
11 winter weather. Local standard time, as filed.
Visibility occasionally dropped to less than one mile in snow, which accumulated to 3.0 inches at Wessington Springs. Roads became snow-covered with dangerous travel conditions.
Visibility occasionally dropped to less than one mile in snow, which accumulated to 5.2 inches at Huron. Roads became snow-covered with dangerous travel conditions.
Visibility occasionally dropped to less than one mile in snow, which accumulated to 3.0 inches at Chamberlain and 5 miles south of Chamberlain. Roads became snow-covered with dangerous travel conditions.
Visibility occasionally dropped to less than one mile in snow, which accumulated to 3.0 inches at Gregory. Roads became snow-covered with dangerous travel conditions.
Visibility occasionally dropped to less than one mile in snow, which accumulated to 4.2 inches at Woonsocket and 3.5 inches 4 miles north northeast of Forestburg. Roads became snow-covered with dangerous travel conditions.
Visibility occasionally dropped to less than one mile in snow, which accumulated to 5.5 inches at Iroquois and 4.0 inches at De Smet. Roads became snow-covered with dangerous travel conditions.
Visibility occasionally dropped to less than one mile in snow, which accumulated to 3.5 inches at White Lake and 4 miles southwest of Stickney. Roads became snow-covered with dangerous travel conditions.
Visibility occasionally dropped to less than one mile in snow, which accumulated to 3.0 inches 5 miles west of Armour. Roads became snow-covered with dangerous travel conditions.
Visibility occasionally dropped to less than one mile in snow, which accumulated to 3.0 inches at Howard. Roads became snow-covered with dangerous travel conditions.
Visibility occasionally dropped to less than one mile in snow, which accumulated to 4.0 inches at Mitchell and 3.0 inches 7 miles south of Mitchell. Roads became snow-covered with dangerous travel conditions.
A period of light freezing rain in the midday and early afternoon produced a glaze of ice on roads, before afternoon cooling changed liquid over to accumulating snow. Visibility occasionally dropped to less than one mile in snow, which accumulated to 3.0 inches 4 miles northeast of Bruce. Roads became snow-covered with dangerous travel conditions.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2021Every state in 2021This day in weather historyWarnings in South Dakota, March 2021
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 946980, 946984, 946975, 946976, 946981, 946985, 946977, 946978, 946982, 946979, 946986.