South Dakota, 2010

Flash Flood and Hail in South Dakota, August 30 to 31, 2010

August 30 to 31, 2010 · NWS FSD · 17 events in 8 counties and zones

Thunderstorms produced damaging winds over part of southeast South Dakota during the late afternoon and evening of August 30th. There were also two reports of large hail and one report of flash flooding.

Where it happened

Every event with a place to put it. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

Open the live radar over this ground

The toll

Deaths
0
Injuries
0
Property damage
$31,000
Crop damage
None recorded
Events
17

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.

What happened

The episode as NWS FSD wrote it up.

Thunderstorms produced damaging winds over part of southeast South Dakota during the late afternoon and evening of August 30th. There were also two reports of large hail and one report of flash flooding. The severe weather and flash flood reports were near or west of the James River, except for one damaging wind report in eastern Kingsbury County.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Sioux Falls, SD wrote its last area forecast discussion before the first event at Aug 30, 2:13 PM CST, 2 hours 7 minutes earlier.

Area forecast discussion, Aug 30, 2:13 PM CST, 2 hours 7 minutes before
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Hazardous weather outlook, Aug 30, 9:04 AM CST, 7 hours 16 minutes before
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The radar

The North Platte radar (KLNX), 158 km away, was scanning. The volume nearest the first event began at 22:22 UTC.

Open the radar archive at this moment

Event by event

14 thunderstorm wind, 2 hail, 1 flash flood. Local standard time, as filed.

Thunderstorm Wind, Gregory

When
August 30, 4:20 PM CST
Where
Gregory County, 8.19 mi ESE of Carlock
Measured
61 kt (70 mph) estimated gust
Reported by
Trained Spotter
Coordinates
43.020, -99.290

Thunderstorm winds caused tree damage, including large branches blown down.

Hail, Gregory

When
August 30, 4:46 PM CST
Where
Gregory County, 0.5 mi W of Herrick
Measured
1 in hail
Reported by
Public
Coordinates
43.120, -99.190

Thunderstorm Wind, Gregory

When
August 30, 4:48 PM CST
Where
Gregory County, 0.5 mi W of Herrick
Measured
56 kt (64 mph) estimated gust
Reported by
Public
Coordinates
43.120, -99.190

Thunderstorm winds caused tree damage, including up to 5 inch diameter branches blown down. The winds also blew a tin part of a roof off a house, and blew a hay bale across a road.

Thunderstorm Wind, Charles Mix

When
August 30, 4:55 PM CST
Where
Charles Mix County, 4.41 mi SSE of Academy
Measured
52 kt (60 mph) estimated gust
Reported by
Public
Coordinates
43.390, -99.050

Thunderstorm winds caused tree damage, including branches blown down.

Thunderstorm Wind, Charles Mix

When
August 30, 5:05 PM CST
Where
Charles Mix County, 3.15 mi NNE of Academy
Measured
56 kt (64 mph) estimated gust
Property damage
$5,000
Reported by
COOP Observer
Coordinates
43.490, -99.050

Thunderstorm winds blew a wagon into a home, damaging the home. The winds also blew a door off a barn.

Thunderstorm Wind, Davison

When
August 30, 5:12 PM CST
Where
Davison County, 6.9 mi NNW of Mt Vernon
Measured
61 kt (70 mph) estimated gust
Reported by
Trained Spotter
Coordinates
43.810, -98.310

Thunderstorm winds caused tree damage. The winds were accompanied by quarter size hail.

Hail, Davison

When
August 30, 5:12 PM CST
Where
Davison County, 6.9 mi NNW of Mt Vernon
Measured
1 in hail
Reported by
Trained Spotter
Coordinates
43.810, -98.310

Large hail was accompanied by damaging winds.

Thunderstorm Wind, Sanborn

When
August 30, 5:20 PM CST
Where
Sanborn County, 2.58 mi WSW of Letcher to Letcher
Measured
70 kt (81 mph) estimated gust
Property damage
$25,000
Reported by
Law Enforcement
Coordinates
43.890, -98.180

Thunderstorm winds destroyed 5 grain bins and caused extensive tree damage. Trees up to 3 feet in diameter were uprooted.

Thunderstorm Wind, Sanborn

When
August 30, 5:38 PM CST
Where
Sanborn County, 2.1 mi WSW of Forestburg
Measured
61 kt (70 mph) estimated gust
Reported by
Storm Chaser
Coordinates
44.010, -98.140

Thunderstorm winds caused tree damage, including several large branches blown down.

Thunderstorm Wind, Charles Mix

When
August 30, 5:38 PM CST
Where
Charles Mix County, 0.51 mi E of Marty
Measured
56 kt (64 mph) estimated gust
Reported by
Trained Spotter
Coordinates
42.980, -98.410

Thunderstorm winds blew the door off a shed and caused tree damage, including large branches blown down.

Thunderstorm Wind, Charles Mix

When
August 30, 5:43 PM CST
Where
Charles Mix County, 1.01 mi W of Wagner
Measured
61 kt (70 mph) estimated gust
Property damage
$1,000
Reported by
Trained Spotter
Coordinates
43.080, -98.320

Thunderstorm winds tore 15 feet of soffit from a house.

Thunderstorm Wind, Sanborn

When
August 30, 5:46 PM CST
Where
Sanborn County, 8.53 mi NNW of Artesian
Measured
56 kt (64 mph) estimated gust
Reported by
Public
Coordinates
44.140, -97.960

Thunderstorm winds caused tree damage, including up to 12 inch diameter limbs blown down.

Thunderstorm Wind, Bon Homme

When
August 30, 6:00 PM CST
Where
Bon Homme County, 4.6 mi SW of Perkins
Measured
52 kt (60 mph) estimated gust
Reported by
Public
Coordinates
42.820, -98.080

Thunderstorm winds caused tree damage, including several branches blown down.

Thunderstorm Wind, Douglas

When
August 30, 6:02 PM CST
Where
Douglas County, 1.51 mi W of Corsica
Measured
52 kt (60 mph) estimated gust
Reported by
Amateur Radio
Coordinates
43.420, -98.430

Thunderstorm winds caused minor tree damage.

Thunderstorm Wind, Hutchinson

When
August 30, 6:20 PM CST
Where
Hutchinson County, 0.85 mi SW of Parkston
Measured
52 kt (60 mph) estimated gust
Reported by
Public
Coordinates
43.390, -97.990

Thunderstorm winds caused tree damage, with a few branches blown down.

Thunderstorm Wind, Kingsbury

When
August 30, 6:55 PM CST
Where
Kingsbury County, 4.4 mi NNW of Oldham
Measured
61 kt (70 mph) estimated gust
Reported by
Public
Coordinates
44.280, -97.330

Thunderstorm winds blew over a semi truck, and cause tree damage, including several trees blown down.

Flash Flood, Sanborn

When
August 30, 9:40 PM CST to August 31, 12:15 AM CST
Where
Sanborn County, 2.3 mi NNE of Letcher to 2.3 mi S of Cuthbert
Cause
Heavy Rain
Reported by
Emergency Manager
Coordinates
43.930, -98.110

Heavy rain caused flash flooding of several roads and low areas.

What these are

Thunderstorm Wind
Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
Hail
Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
Flash Flood
Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in South Dakota in 2010Every state in 2010This day in weather historyWarnings in South Dakota, August 2010

Sources

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 2026-09-24. Each event’s entry at NCEI: 257302, 257304, 257306, 257307, 257311, 257312, 257313, 257364, 257366, 257367, 257370, 257373, 257392, 257393, 257395, 257396, 257397.