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 35 to 45 mph and produced brief periods of near whiteout conditions. The system was dynamic enough to produce a few thunderstorms early on March 5.

Winter Weather in MOODY, SOUTH DAKOTA
From 05-MAR-18 08:00:00 to 06-MAR-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hazardous winter weather evolved during the morning of March 5, as rain changed to light to moderate snowfall and was accompanied by winds gusting as high as 43 mph at Sioux Falls, 37 mph at Madison and 35 mph at Brookings. There were brief blizzard or near blizzard conditions during the midday hours around Sioux Falls, but not persistent enough to be defined as a blizzard. Total snowfall was generally 3 to 6 inches, including 4.2 inches at Brookings. Flandreau and Sioux Falls, and 3.6 inches 2 miles north of Chester.

Winter Weather in MINNEHAHA, SOUTH DAKOTA
From 05-MAR-18 08:00:00 to 06-MAR-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Hazardous winter weather evolved during the morning of March 5, as rain changed to light to moderate snowfall and was accompanied by winds gusting as high as 43 mph at Sioux Falls, 37 mph at Madison and 35 mph at Brookings. There were brief blizzard or near blizzard conditions during the midday hours around Sioux Falls, but not persistent enough to be defined as a blizzard. Total snowfall was generally 3 to 6 inches, including 4.2 inches at Brookings. Flandreau and Sioux Falls, and 3.6 inches 2 miles north of Chester.

Winter Weather in LAKE, SOUTH DAKOTA
From 05-MAR-18 08:00:00 to 06-MAR-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hazardous winter weather evolved during the morning of March 5, as rain changed to light to moderate snowfall and was accompanied by winds gusting as high as 43 mph at Sioux Falls, 37 mph at Madison and 35 mph at Brookings. There were brief blizzard or near blizzard conditions during the midday hours around Sioux Falls, but not persistent enough to be defined as a blizzard. Total snowfall was generally 3 to 6 inches, including 4.2 inches at Brookings. Flandreau and Sioux Falls, and 3.6 inches 2 miles north of Chester.

Winter Weather in BROOKINGS, SOUTH DAKOTA
From 05-MAR-18 08:00:00 to 06-MAR-18 10:00:00 (CST-6)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hazardous winter weather evolved during the morning of March 5, as rain changed to light to moderate snowfall and was accompanied by winds gusting as high as 43 mph at Sioux Falls, 37 mph at Madison and 35 mph at Brookings. There were brief blizzard or near blizzard conditions during the midday hours around Sioux Falls, but not persistent enough to be defined as a blizzard. Total snowfall was generally 3 to 6 inches, including 4.2 inches at Brookings. Flandreau and Sioux Falls, and 3.6 inches 2 miles north of Chester.