An intense negative tilt upper-level trough pushed out across the Rockies and into the Plains on March 5, deepening into a very strong closed low across Iowa by early on March 6.  500 hPa heights fell as much as 27 dam in 24 hours as the system deepened.  As a result, winds increased to a gusty 40 to 60 mph and produced whiteout conditions at times.  The system was dynamic enough to produce thunderstorms with heavy rainfall early on March 5 toward far eastern South Dakota.

Blizzard in HUTCHINSON, SOUTH DAKOTA
From 05-MAR-18 10:00:00 to 06-MAR-18 03:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Winds gusted as high as 44 mph at Parkston with snowfall of 6 inches at Parkston and 8 inches at Menno, producing whiteout conditions. SDDOT recommended no travel and suspended winter maintenance due to whiteout conditions from late on March 5 through early on March 6. Most schools were closed on March 5 and March 6.

Blizzard in DOUGLAS, SOUTH DAKOTA
From 05-MAR-18 10:00:00 to 06-MAR-18 04:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Winds gusted as high as 52 mph near Wagner with snowfall up to 9.0 inches 10 miles west of Dimock, producing whiteout conditions. SDDOT recommended no travel and suspended winter maintenance due to whiteout conditions from the afternoon of March 5 through early on March 6. Most schools were closed on March 5 and March 6.

Blizzard in BON HOMME, SOUTH DAKOTA
From 05-MAR-18 10:00:00 to 06-MAR-18 03:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winds gusted as high as 52 mph near Wagner and 47 mph near Yankton, with snowfall of 5.6 inches at Tyndall, producing whiteout conditions. SDDOT recommended no travel and suspended winter maintenance due to whiteout conditions from late on March 5 through early on March 6. Most schools were closed on March 5 and March 6.

Blizzard in YANKTON, SOUTH DAKOTA
From 05-MAR-18 10:00:00 to 06-MAR-18 04:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Winds gusted as high as 47 mph near Yankton with snowfall of 8.0 inches, producing whiteout conditions. SDDOT recommended no travel and suspended winter maintenance due to whiteout conditions from late on March 5 through early on March 6. Most schools were closed on March 5 and March 6.

Blizzard in CLAY, SOUTH DAKOTA
From 05-MAR-18 13:00:00 to 06-MAR-18 09:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Winds gusted as high as 40 mph near Vermillion with snowfall of 5 to 7 inches, producing whiteout conditions. SDDOT closed Interstate 29 at 1830CST March 5 through early morning on March 6. Winter road maintenance was suspended in all areas due to whiteout conditions from late on March 5 through early on March 6. Most schools were closed or released early on March 5 and closed March 6.

Blizzard in MCCOOK, SOUTH DAKOTA
From 05-MAR-18 13:00:00 to 06-MAR-18 09:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winds gusted as high as 43 mph at Sioux Falls with snowfall up to 8.5 inches at Bridgewater, producing whiteout conditions. SDDOT closed Interstate 90 at 1730CST March 5 through early morning on March 6. Winter road maintenance was suspended in all areas due to whiteout conditions from late on March 5 through early on March 6. Most schools were closed or released early on March 5 and closed March 6.

Blizzard in TURNER, SOUTH DAKOTA
From 05-MAR-18 13:00:00 to 06-MAR-18 09:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winds gusted as high as 43 mph at Sioux Falls with snowfall up to 8.2 inches at Marion, producing whiteout conditions. SDDOT recommended no travel from late afternoon March 5 through early morning on March 6, and winter road maintenance was suspended in all areas due to whiteout conditions. Most schools were closed or released early on March 5 and closed March 6.

Blizzard in BRULE, SOUTH DAKOTA
From 05-MAR-18 10:00:00 to 06-MAR-18 05:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Winds gusted as high as 53 mph at Chamberlain with snowfall from 3 to 6 inches, producing whiteout conditions. SDDOT closed Interstate 90 and suspended winter maintenance due to whiteout conditions.  Most schools were closed on March 5 and March 6.

Blizzard in AURORA, SOUTH DAKOTA
From 05-MAR-18 10:00:00 to 06-MAR-18 05:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Winds gusted as high as 45 mph at White Lake with snowfall of 11.8 inches, producing whiteout conditions. SDDOT closed Interstate 90 and suspended winter maintenance due to whiteout conditions.  Most schools were closed on March 5 and March 6.

Blizzard in JERAULD, SOUTH DAKOTA
From 05-MAR-18 10:00:00 to 06-MAR-18 05:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winds gusted as high as 53 mph at Chamberlain with snowfall from 3 to 6 inches, producing whiteout conditions. SDDOT recommended no travel and suspended winter maintenance due to whiteout conditions from the afternoon of March 5 until early March 6. Most schools were closed on March 5 and March 6.

Blizzard in DAVISON, SOUTH DAKOTA
From 05-MAR-18 09:00:00 to 05-MAR-18 23:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Winds gusted as high as 48 mph at Mitchell with snowfall from 6 to 8 inches, producing whiteout conditions. SDDOT closed Interstate 90 and suspended winter maintenance due to whiteout conditions. Most schools were closed on March 5 and March 6.

Blizzard in LINCOLN, SOUTH DAKOTA
From 05-MAR-18 10:00:00 to 06-MAR-18 07:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Winds gusted as high as 43 mph at Sioux Falls with snowfall up to 3.5 inches at Canton and 4 inches on the south side of Sioux Falls, producing whiteout conditions. SDDOT closed Interstate 29 at 1830CST through early morning on March 6, and winter road maintenance was suspended in all areas due to whiteout conditions. Most schools were closed or released early on March 5 and closed March 6.

Blizzard in UNION, SOUTH DAKOTA
From 05-MAR-18 10:00:00 to 06-MAR-18 07:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winds gusted as high as 40 to 45 mph with snowfall up to 5.5 inches near Elk Point, producing whiteout conditions. SDDOT closed Interstate 29 at 1830CST through early morning on March 6, and winter road maintenance was suspended in all areas due to whiteout conditions. Most schools were closed or released early on March 5 and closed March 6.

Blizzard in HANSON, SOUTH DAKOTA
From 05-MAR-18 09:00:00 to 05-MAR-18 23:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Winds gusted as high as 48 mph at Mitchell with snowfall from 6 to 8 inches, producing whiteout conditions. SDDOT closed Interstate 90 and suspended winter maintenance due to whiteout conditions. Most schools were closed on March 5 and March 6.

Blizzard in GREGORY, SOUTH DAKOTA
From 05-MAR-18 13:00:00 to 06-MAR-18 06:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Winds gusted as high as 55 mph near Gregory with snowfall from 2 to 4 inches, producing whiteout conditions. SDDOT recommended no travel and suspended winter maintenance due to whiteout conditions from the afternoon of March 5 through early on March 6. Most schools were closed on March 5 and March 6.

Blizzard in CHARLES MIX, SOUTH DAKOTA
From 05-MAR-18 10:00:00 to 06-MAR-18 04:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

Winds gusted as high as 49 mph near Platte, 52 mph near Wagner, and 59 mph near Geddes with snowfall from 3 to 5 inches, producing whiteout conditions. SDDOT recommended no travel and suspended winter maintenance due to whiteout conditions from the afternoon of March 5 through early on March 6. Most schools were closed on March 5 and March 6.