A strong northwesterly jet streak digging through the central Rockies produced intense and deep cyclogenesis across Iowa on January 14 and 15.  Initial precipitation swept through the area as rain, but a surge of cold air into the slowing cyclone wrapped snowfall back into areas east of the James River as winds increased to 50 to 70 mph, resulting in areas of blizzard conditions, especially near and east of Interstate 29.

Blizzard in UNION, SOUTH DAKOTA
From 14-JAN-21 19:00:00 to 15-JAN-21 06:00:00 (CST-6)
Reported by: Department of Highways

As snow redeveloped and began to accumulate toward evening on January 14, the increase in winds to a sustained 30 to 40 mph with a few gusts as high as 62 mph at South Dakota RWIS site 3 miles south of Beresford and 55 mph near North Sioux City, resulted in widespread near white-out conditions.  Interstate 29 was closed in South Dakota at 2200CST January 14 and reopened at 0630CST January 15. Snowfall totaled 2.2 inches 6 miles north northeast of Elk Point. At 1820CST on January 15, a two vehicle accident 2 miles south of Elk Point resulted in the indirect fatality to the driver of a southbound pickup which slid through the median and collided with an oncoming SUV in the northbound lane. Two occupants in the other vehicle suffered indirect injury.

Blizzard in MOODY, SOUTH DAKOTA
From 14-JAN-21 18:00:00 to 15-JAN-21 06:00:00 (CST-6)
Reported by: Mesonet

As snow redeveloped toward evening on January 14, the increase in winds to a sustained 30 to 40 mph, with a few gusts as high as 57 mph at South Dakota RWIS site 14 miles west of Ward and 49 mph at SDSU mesonet site at Flandreau, resulted in widespread white-out conditions. Interstate 29 was closed in South Dakota at 2200CST January 14, with the portion north of Sioux Falls reopened by 0730CST January 15. Snowfall totaled 2.0 inches at Flandreau.

High Wind in CLAY, SOUTH DAKOTA
From 14-JAN-21 19:00:00 to 15-JAN-21 06:00:00 (CST-6)
Magnitude: 50.00 MG
Reported by: Mesonet

Sustained winds at an automated observation site 9 miles south southwest of Beresford were occasionally measured at 40 to 45 mph, with the South Dakota RWIS site 3 miles south of Beresford reaching a peak gust of 62 mph during the early overnight of January 15.

High Wind in TURNER, SOUTH DAKOTA
From 14-JAN-21 11:00:00 to 14-JAN-21 18:00:00 (CST-6)
Magnitude: 38.00 MS
Reported by: Mesonet

Sustained wind at an automated observation site 3 miles north of Irene were measured from 40 to 45 mph at times during the midday and early afternoon on January 14.

High Wind in BEADLE, SOUTH DAKOTA
From 14-JAN-21 08:30:00 to 14-JAN-21 22:30:00 (CST-6)
Magnitude: 57.00 MG
Reported by: ASOS

Sustained winds were occasionally 40 to 45 mph for numerous hours, with peak gusts at observation site KHON at 1414CST (62 mph) and South Dakota RWIS site near Wolsey at 1644CST (66 mph).

Blizzard in MINNEHAHA, SOUTH DAKOTA
From 14-JAN-21 18:00:00 to 15-JAN-21 06:00:00 (CST-6)
Reported by: ASOS

As snow redeveloped and began to accumulate toward evening on January 14, the increase in winds to a sustained 30 to 40 mph with a few gusts as high as 58 mph at automated site KFSD in Sioux Falls and 57 mph at the South Dakota RWIS site near Dell Rapids, resulted in widespread near white-out conditions. Around 2000CST, the county sheriff reported that travel was not recommended in the county. Interstate 29 was closed in South Dakota at 2200CST January 14, along with Interstate 90 east of Sioux Falls. Both interstate highways reopened at 0730CST January 15. Snowfall totaled 3.0 inches at Colton, 2.7 inches 6 miles south of Hartford and 2.1 inches at Sioux Falls.

High Wind in BON HOMME, SOUTH DAKOTA
From 14-JAN-21 21:45:00 to 15-JAN-21 10:15:00 (CST-6)
Magnitude: 52.00 MG
Reported by: Department of Highways

Winds at the South Dakota RWIS site 3 miles east southeast of Tyndall were occasionally sustained from 35 to 45 mph, with gusts as high as 60 mph around 2150CST on January 14.

High Wind in BRULE, SOUTH DAKOTA
From 14-JAN-21 11:00:00 to 15-JAN-21 10:00:00 (CST-6)
Magnitude: 63.00 MG
Reported by: Department of Highways

Winds at the South Dakota RWIS site at Kimball were occasionally sustained to 40 to 45 mph, with gusts as high as 73 mph around 1456CST on January 14.

High Wind in CHARLES MIX, SOUTH DAKOTA
From 14-JAN-21 04:15:00 to 15-JAN-21 11:30:00 (CST-6)
Magnitude: 70.00 MG
Reported by: Department of Highways

Winds at the South Dakota RWIS site 13 miles west of Platte were occasionally sustained to 40 to 50 mph, with gusts as high as 81 mph around 1425CST on January 14.

High Wind in YANKTON, SOUTH DAKOTA
From 14-JAN-21 17:00:00 to 15-JAN-21 12:00:00 (CST-6)
Magnitude: 52.00 MG
Reported by: Department of Highways

Winds at the South Dakota RWIS site near Gayville were occasionally sustained to 40 to 45 mph, with gusts as high as 64 mph around 1831CST on January 14.

High Wind in DOUGLAS, SOUTH DAKOTA
From 14-JAN-21 12:00:00 to 15-JAN-21 11:00:00 (CST-6)
Magnitude: 36.00 MS
Reported by: Public

Winds reached a sustained 41 mph at a mesonet station at Corsica around 1515CST January 14.

High Wind in HUTCHINSON, SOUTH DAKOTA
From 14-JAN-21 12:00:00 to 15-JAN-21 11:30:00 (CST-6)
Magnitude: 58.00 MG
Reported by: Department of Highways

Winds at the South Dakota RWIS sites 1 mile northwest of Tripp and 4 miles south of Freeman were occasionally sustained to 40 to 50 mph. Gusts peaked as high as 67 mph around 0345CST on January 15 near Tripp, and 64 mph near Freeman around 2030CST on January 14.

High Wind in HANSON, SOUTH DAKOTA
From 14-JAN-21 11:30:00 to 15-JAN-21 11:30:00 (CST-6)
Magnitude: 60.00 MG
Reported by: Department of Highways

Winds at the South Dakota RWIS site 3 miles east of Alexandria were occasionally sustained to 40 to 45 mph, with gusts as high as 69 mph around 2000CST on January 14.

High Wind in GREGORY, SOUTH DAKOTA
From 14-JAN-21 04:30:00 to 15-JAN-21 12:00:00 (CST-6)
Magnitude: 64.00 MG
Reported by: Department of Highways

Winds at the South Dakota RWIS site 2 miles southwest of Pickstown were occasionally sustained to 40 to 55 mph, with gusts as high as 74 mph around 1245CST on January 14.

High Wind in SANBORN, SOUTH DAKOTA
From 14-JAN-21 09:00:00 to 14-JAN-21 22:00:00 (CST-6)
Magnitude: 53.00 MG
Reported by: Department of Highways

Winds at the South Dakota RWIS site 4 miles east southeast of Forestburg were occasionally sustained to 35 to 45 mph, with gusts as high as 61 mph around 1929CST on January 14.

High Wind in JERAULD, SOUTH DAKOTA
From 14-JAN-21 09:00:00 to 14-JAN-21 22:00:00 (CST-6)
Magnitude: 56.00 MG
Reported by: RAWS

Winds at the South Dakota Wessington RAWS site were occasionally sustained to 40 to 45 mph, with gusts as high as 64 mph around 1400CST on January 14.

High Wind in MINER, SOUTH DAKOTA
From 14-JAN-21 13:00:00 to 14-JAN-21 17:00:00 (CST-6)
Magnitude: 52.00 MG
Reported by: Department of Highways

Winds at the South Dakota RWIS site 1 mile west of Howard were occasionally sustained to 35 to 40 mph, with gusts as high as 60 mph around 1315CST on January 14.

High Wind in MCCOOK, SOUTH DAKOTA
From 14-JAN-21 11:00:00 to 14-JAN-21 19:30:00 (CST-6)
Magnitude: 53.00 MG
Reported by: Department of Highways

Winds at the South Dakota RWIS site near Montrose were occasionally sustained to 40 to 45 mph, with gusts as high as 61 mph around 1644CST on January 14.

Blizzard in BROOKINGS, SOUTH DAKOTA
From 14-JAN-21 15:00:00 to 15-JAN-21 10:00:00 (CST-6)
Reported by: Social Media

As snow redeveloped during the late afternoon on January 14, the increase in winds to a sustained 30 to 40 mph, with a few gusts as high as 51 mph at automated site KBKX in Brookings resulted in widespread white-out conditions.  Interstate 29 was closed in South Dakota at 2200CST January 14, with the portion north of Sioux Falls reopened by 0730CST January 15. Snowfall totaled 3.0 inches 2 miles south of Astoria and 2.3 inches 6 miles west of White.

Blizzard in LINCOLN, SOUTH DAKOTA
From 14-JAN-21 18:00:00 to 15-JAN-21 05:00:00 (CST-6)
Reported by: COOP Observer

As snow redeveloped and began to accumulate toward evening on January 14, the increase in winds to a sustained 30 to 40 mph with a few gusts as high as 55 mph at the South Dakota RWIS site 9 miles east of Davis, resulted in widespread near white-out conditions.  Interstate 29 was closed in South Dakota at 2200CST January 14, and  reopened at 0630CST January 15. Snowfall totaled 2.5 inches on the southern side of Sioux Falls and 2.0 inches at Canton.

High Wind in AURORA, SOUTH DAKOTA
From 14-JAN-21 11:30:00 to 15-JAN-21 11:30:00 (CST-6)
Magnitude: 59.00 MG
Reported by: Department of Highways

Winds at the South Dakota RWIS site 4 miles west of Plankinton were occasionally sustained to 40 to 45 mph, with gusts as high as 68 mph around 1345CST on January 14.

Blizzard in KINGSBURY, SOUTH DAKOTA
From 14-JAN-21 18:00:00 to 15-JAN-21 04:00:00 (CST-6)
Reported by: COOP Observer

Winds near Iroquois and Arlington reached a sustained 35 to 45 mph, with numerous gusts to 50 mph from around 1500CST January 14 through early January 15. Snowfall totaled 4.5 inches 9 miles south southwest of Arlington and 3.0 inches at De Smet, which when combined with the wind resulted in visibility at times of one-quarter to one-half mile, with near whiteout conditions along Highway 81.

Blizzard in LAKE, SOUTH DAKOTA
From 14-JAN-21 18:00:00 to 15-JAN-21 05:00:00 (CST-6)
Reported by: AWOS

Winds at Madison (KMDS) reached a sustained 30 to 40 mph, with numerous gusts to around 50 mph from around 1500CST January 14 through early January 15. Snowfall totaled 2.3 inches 2 miles north of Chester and 2.0 inches at Madison, which when combined with the wind resulted in visibility at times of one-quarter to one-half mile.

High Wind in DAVISON, SOUTH DAKOTA
From 14-JAN-21 12:00:00 to 15-JAN-21 09:00:00 (CST-6)
Magnitude: 56.00 MG
Reported by: ASOS

Winds at automated weather station KMHE were frequently sustained at 35 to 45 mph, and peaked at 64 mph at 1218CST January 14.