An intense upper level low pressure area moved across the region Sunday into Monday morning bringing very heavy snowfall to all of the region. Snowfall amounts of 10 to over 20 inches along with north winds of 25 to 40 mph brought widespread blizzard conditions and heavy drifting across the region. The heavy snow and low visibilities resulted in road closures Sunday into Monday. Interstate-29 and Interstate-90 were both closed on Sunday and not opened until Monday. Interstate-29 was closed from Sioux Falls to the North Dakota border while Interstate-90 was closed from Wall to Chamberlain.  Businesses, flights, schools, and many events were closed or cancelled Sunday and Monday.  At several locations, this snowstorm set all-time record snowiest calender days in February along with top five all-time snowiest calender days for the season. Finally, the February snowfall totals were in the top five all-time for most locations.
Snowfall amounts across the region included 10 inches at Pollock and Selby; 11 inches at Mobridge, Kennebec, and Onida; 12 inches at Pierre, Blunt, Castlewood, and Eagle Butte.  Locations with more than a foot of snowfall included 13 inches at Hayti, Roscoe, and Eureka; 14 inches at Ipswich, Clear Lake, Clark, Mission Ridge, Mclaughlin, Sisseton, Gann Valley, Gettysburg and Victor; 15 inches at Bryant, Bowdle, Watertown, and Leola; 16 inches at Faulkton, Wilmot, and Summit; with 17 inches at Andover.  Locations with 18 inches or more included, 18 inches at Aberdeen, Redfield, and Stratford; 20 inches at Turton and Ree Heights; 21 inches at Milbank; 22 inches at Miller and 23 inches near Highmore. The snowfall began in the early morning hours of the 20th and ended around noon on the 21st.

Blizzard in ROBERTS, SOUTH DAKOTA
From 20-FEB-11 13:00:00 to 20-FEB-11 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Blizzard in GRANT, SOUTH DAKOTA
From 20-FEB-11 13:00:00 to 20-FEB-11 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Blizzard in CORSON, SOUTH DAKOTA
From 20-FEB-11 10:00:00 to 20-FEB-11 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Blizzard in DEUEL, SOUTH DAKOTA
From 20-FEB-11 12:00:00 to 20-FEB-11 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Blizzard in DEWEY, SOUTH DAKOTA
From 20-FEB-11 10:00:00 to 20-FEB-11 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Blizzard in MCPHERSON, SOUTH DAKOTA
From 20-FEB-11 11:00:00 to 20-FEB-11 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Blizzard in STANLEY, SOUTH DAKOTA
From 20-FEB-11 09:00:00 to 20-FEB-11 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Blizzard in CAMPBELL, SOUTH DAKOTA
From 20-FEB-11 10:00:00 to 20-FEB-11 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Blizzard in FAULK, SOUTH DAKOTA
From 20-FEB-11 11:00:00 to 20-FEB-11 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Blizzard in JONES, SOUTH DAKOTA
From 20-FEB-11 09:00:00 to 20-FEB-11 17:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Blizzard in LYMAN, SOUTH DAKOTA
From 20-FEB-11 09:00:00 to 20-FEB-11 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Blizzard in WALWORTH, SOUTH DAKOTA
From 20-FEB-11 10:00:00 to 20-FEB-11 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Blizzard in SULLY, SOUTH DAKOTA
From 20-FEB-11 07:00:00 to 20-FEB-11 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Blizzard in HUGHES, SOUTH DAKOTA
From 20-FEB-11 07:00:00 to 20-FEB-11 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Blizzard in POTTER, SOUTH DAKOTA
From 20-FEB-11 10:00:00 to 20-FEB-11 18:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Blizzard in HYDE, SOUTH DAKOTA
From 20-FEB-11 10:00:00 to 20-FEB-11 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Blizzard in BROWN, SOUTH DAKOTA
From 20-FEB-11 11:00:00 to 20-FEB-11 21:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Blizzard in HAND, SOUTH DAKOTA
From 20-FEB-11 11:00:00 to 20-FEB-11 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Blizzard in SPINK, SOUTH DAKOTA
From 20-FEB-11 11:00:00 to 20-FEB-11 21:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Blizzard in MARSHALL, SOUTH DAKOTA
From 20-FEB-11 12:00:00 to 20-FEB-11 21:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Blizzard in BUFFALO, SOUTH DAKOTA
From 20-FEB-11 11:00:00 to 20-FEB-11 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Blizzard in DAY, SOUTH DAKOTA
From 20-FEB-11 12:00:00 to 20-FEB-11 21:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Blizzard in CLARK, SOUTH DAKOTA
From 20-FEB-11 12:00:00 to 20-FEB-11 21:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Blizzard in EDMUNDS, SOUTH DAKOTA
From 20-FEB-11 10:00:00 to 20-FEB-11 19:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Blizzard in CODINGTON, SOUTH DAKOTA
From 20-FEB-11 08:00:00 to 20-FEB-11 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Blizzard in HAMLIN, SOUTH DAKOTA
From 20-FEB-11 08:00:00 to 20-FEB-11 20:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager