Tornado and Hail in South Dakota, July 17, 1986

Name: Tornado and Hail in South Dakota, July 17, 1986
Start: 1986-07-17T16:05
End: 1986-07-17T18:12
Location: South Dakota

July 17, 1986 · 5 events in 3 counties and zones

2 hail, 2 thunderstorm wind, 1 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

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The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 5

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

2 hail, 2 thunderstorm wind, 1 tornado. Local standard time, as filed.

Hail, Sanborn

When: July 17, 4:05 PM CST
Where: Sanborn County
Measured: 0.75 in hail
Coordinates: 44.050, -98.270

Tornado, Brown

When: July 17, 4:53 PM CST
Where: Brown County
Rating: F0
Path length: 0.1 mi
Path width: 23 yd
Coordinates: 45.580, -98.650

Thunderstorm Wind, Spink

When: July 17, 5:10 PM CST
Where: Spink County
Coordinates: 45.250, -98.570

Hail, Brown

When: July 17, 5:30 PM CST
Where: Brown County
Measured: 1.75 in hail
Coordinates: 45.620, -98.330

Thunderstorm Wind, Brown

When: July 17, 6:12 PM CST
Where: Brown County
Measured: 52 kt (60 mph)
Coordinates: 45.470, -98.250

What these are

Hail: Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
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.
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 1986 Every state in 1986 This day in weather history The tornado archive for South Dakota, 1986 Warnings in South Dakota, July 1986

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: 10127080, 10127081, 10127082, 10127083, 10127084.