Tornadoes and Hail in South Dakota, July 21, 1991

Name: Tornadoes and Hail in South Dakota, July 21, 1991
Start: 1991-07-21T15:05
End: 1991-07-21T20:35
Location: South Dakota

July 21, 1991 · NWS ABR · 27 events in 15 counties and zones

13 hail, 11 thunderstorm wind, 3 tornado, as filed by the National Weather Service.

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: $750
Crop damage: None recorded
Events: 27

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.

Event by event

13 hail, 11 thunderstorm wind, 3 tornado. Local standard time, as filed.

Tornado, Meade

When: July 21, 3:05 PM CST
Where: Meade County
Rating: F0
Path length: 0.1 mi
Path width: 50 yd
Property damage: $250
Coordinates: 44.430, -102.720

Hail, Brown

When: July 21, 3:05 PM CST
Where: Brown County
Measured: 1.25 in hail
Coordinates: 45.920, -98.400

Thunderstorm Wind, Brown

When: July 21, 3:15 PM CST
Where: Brown County
Measured: 56 kt (64 mph)
Coordinates: 45.850, -98.150

Tornado, Meade

When: July 21, 3:40 PM CST
Where: Meade County
Rating: F0
Path length: 0.1 mi
Path width: 23 yd
Property damage: $250
Coordinates: 45.000, -102.870

Hail, Harding

When: July 21, 3:50 PM CST
Where: Harding County
Measured: 1.75 in hail
Coordinates: 45.270, -102.950

Hail, Perkins

When: July 21, 3:52 PM CST
Where: Perkins County
Measured: 1.75 in hail
Coordinates: 45.270, -102.830

Thunderstorm Wind, Marshall

When: July 21, 4:00 PM CST
Where: Marshall County
Measured: 60 kt (69 mph)
Coordinates: 45.800, -97.900

Thunderstorm Wind, Brown

When: July 21, 4:15 PM CST
Where: Brown County
Measured: 65 kt (75 mph)
Coordinates: 45.880, -98.320

Thunderstorm Wind, Marshall

When: July 21, 4:20 PM CST
Where: Marshall County
Measured: 58 kt (67 mph)
Coordinates: 45.600, -97.830

Hail, Day

When: July 21, 4:35 PM CST
Where: Day County
Measured: 0.75 in hail
Coordinates: 45.530, -97.320

Hail, Brown

When: July 21, 4:40 PM CST
Where: Brown County
Measured: 0.75 in hail
Coordinates: 45.270, -98.500

Hail, Roberts

When: July 21, 4:45 PM CST
Where: Roberts County
Measured: 1 in hail
Coordinates: 45.670, -97.200

Thunderstorm Wind, Dewey

When: July 21, 4:55 PM CST
Where: Dewey County
Coordinates: 45.000, -101.230

Hail, Marshall

When: July 21, 5:00 PM CST
Where: Marshall County
Measured: 0.75 in hail
Coordinates: 45.620, -97.300

Hail, Roberts

When: July 21, 5:01 PM CST
Where: Roberts County
Measured: 1.75 in hail
Coordinates: 45.670, -97.220

Hail, Day

When: July 21, 5:03 PM CST
Where: Day County
Measured: 1 in hail
Coordinates: 45.480, -97.320

Hail, Corson

When: July 21, 5:20 PM CST
Where: Corson County
Measured: 0.75 in hail
Coordinates: 45.920, -101.530

Thunderstorm Wind, Roberts

When: July 21, 5:37 PM CST
Where: Roberts County
Measured: 62 kt (71 mph)
Coordinates: 45.330, -96.770

Hail, Clark

When: July 21, 5:45 PM CST
Where: Clark County
Measured: 2.75 in hail
Coordinates: 45.080, -97.630

Thunderstorm Wind, Roberts

When: July 21, 5:45 PM CST
Where: Roberts County
Measured: 65 kt (75 mph)
Coordinates: 45.330, -97.200

Thunderstorm Wind, Day

When: July 21, 5:52 PM CST
Where: Day County
Measured: 70 kt (81 mph)
Coordinates: 45.330, -97.320

Thunderstorm Wind, Roberts

When: July 21, 6:00 PM CST
Where: Roberts County
Measured: 62 kt (71 mph)
Coordinates: 45.400, -96.870

Thunderstorm Wind, Grant

When: July 21, 6:30 PM CST
Where: Grant County
Measured: 70 kt (81 mph)
Coordinates: 45.220, -96.630

Hail, Jones

When: July 21, 7:00 PM CST
Where: Jones County
Measured: 0.75 in hail
Coordinates: 44.070, -100.970

Tornado, Walworth

When: July 21, 7:07 PM CST
Where: Walworth County
Rating: F0
Path length: 3 mi
Path width: 23 yd
Property damage: $250
Coordinates: 45.580, -100.280

Thunderstorm Wind, Campbell

When: July 21, 8:00 PM CST
Where: Campbell County
Coordinates: 45.720, -100.070

Hail, Clay

When: July 21, 8:35 PM CST
Where: Clay County
Measured: 1 in hail
Coordinates: 42.780, -96.920

What these are

Tornado: A violently rotating column of air in contact with the ground and extending from a thunderstorm, filed with its path, width and Fujita or Enhanced Fujita rating from the damage survey.
Hail: Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
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.

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

The same day elsewhere

Every storm in South Dakota in 1991 Every state in 1991 This day in weather history The tornado archive for South Dakota, 1991 Warnings in South Dakota, July 1991

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: 10127103, 10127104, 10127105, 10127106, 10127107, 10127322, 10127323, 10127324, 10127325, 10127326, 10127327, 10127328, 10127329, 10127330, 10127331, 10127332, 10127333, 10127334, 10127335, 10127336, 10127337, 10127338, 10127339, 10127340, 10127341, 10127342, 10127343.