Thunderstorm Wind, Lyman
- When
- July 9, 6:20 PM CST
- Where
- Lyman County
- Coordinates
- 43.880, -99.900
Tornadoes and Hail in South Dakota, July 9, 1971
4 thunderstorm wind, 2 tornado, 1 hail, 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
The toll
- Deaths
- 0
- Injuries
- 2
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 7
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
4 thunderstorm wind, 2 tornado, 1 hail. Local standard time, as filed.
Tornado, Lyman
- When
- July 9, 6:30 PM CST
- Where
- Lyman County
- Rating
- F3
- Path width
- 33 yd
- Coordinates
- 44.080, -99.600
Hail, Lyman
- When
- July 9, 6:30 PM CST
- Where
- Lyman County
- Measured
- 2.75 in hail
- Coordinates
- 43.580, -99.580
Thunderstorm Wind, Brule
- When
- July 9, 6:45 PM CST
- Where
- Brule County
- Coordinates
- 43.780, -99.280
Tornado, Lyman
- When
- July 9, 8:00 PM CST
- Where
- Lyman County
- Rating
- F3
- Path width
- 33 yd
- Injuries
- 2 direct, 0 indirect
- Coordinates
- 43.880, -99.620
Thunderstorm Wind, Davison
- When
- July 9, 8:00 PM CST
- Where
- Davison County
- Measured
- 62 kt (71 mph)
- Coordinates
- 43.700, -98.000
Thunderstorm Wind, Yankton
- When
- July 9, 10:30 PM CST
- Where
- Yankton County
- Coordinates
- 42.880, -97.400
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.
- 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.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Tornado and Damaging Wind in Kansas, July 9, 1971
- Damaging Winds in Indiana, July 9, 1971
- Hail and Damaging Winds in Nebraska, July 9, 1971
- Damaging Wind in Pennsylvania, July 9, 1971
- Damaging Wind in Ohio, July 9, 1971
- Hail in Florida, July 9, 1971
- Hail in Montana, July 9, 1971
- Damaging Wind in Idaho, July 9, 1971
- Hail in Oregon, July 9, 1971
- Damaging Wind in North Dakota, July 9, 1971
More
Every storm in South Dakota in 1971Every state in 1971This day in weather historyThe tornado archive for South Dakota, 1971
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: 10110114, 10110115, 10110116, 10110117, 10110118, 10110119, 10110120.