Hail, Haakon
- When
- May 18, 5:00 PM CST
- Where
- Haakon County
- Measured
- 1.75 in hail
- Coordinates
- 44.030, -101.670
Tornadoes and Hail in South Dakota, May 18, 1977
5 hail, 5 thunderstorm wind, 2 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
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- $3,000
- Crop damage
- None recorded
- Events
- 12
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
5 hail, 5 thunderstorm wind, 2 tornado. Local standard time, as filed.
Hail, Bennett
- When
- May 18, 5:00 PM CST
- Where
- Bennett County
- Measured
- 2.75 in hail
- Coordinates
- 43.170, -101.270
Thunderstorm Wind, Bennett
- When
- May 18, 5:00 PM CST
- Where
- Bennett County
- Measured
- 52 kt (60 mph)
- Coordinates
- 43.170, -101.270
Thunderstorm Wind, Haakon
- When
- May 18, 5:00 PM CST
- Where
- Haakon County
- Measured
- 75 kt (86 mph)
- Coordinates
- 44.030, -101.670
Hail, Haakon
- When
- May 18, 5:25 PM CST
- Where
- Haakon County
- Measured
- 0.75 in hail
- Coordinates
- 44.050, -101.600
Thunderstorm Wind, Haakon
- When
- May 18, 5:25 PM CST
- Where
- Haakon County
- Measured
- 75 kt (86 mph)
- Coordinates
- 44.050, -101.600
Hail, Fall River
- When
- May 18, 5:30 PM CST
- Where
- Fall River County
- Measured
- 1.75 in hail
- Coordinates
- 43.430, -103.480
Hail, Pennington
- When
- May 18, 5:50 PM CST
- Where
- Pennington County
- Measured
- 1.75 in hail
- Coordinates
- 44.020, -103.470
Thunderstorm Wind, Lyman
- When
- May 18, 6:06 PM CST
- Where
- Lyman County
- Measured
- 70 kt (81 mph)
- Coordinates
- 43.900, -100.050
Thunderstorm Wind, Lyman
- When
- May 18, 7:00 PM CST
- Where
- Lyman County
- Measured
- 71 kt (82 mph)
- Coordinates
- 43.900, -100.050
Tornado, Dewey
- When
- May 18, 7:20 PM CST
- Where
- Dewey County
- Path width
- 33 yd
- Property damage
- $3,000
- Coordinates
- 45.370, -101.430
Tornado, Corson
- When
- May 18, 8:20 PM CST
- Where
- Corson County
- Path width
- 33 yd
- Coordinates
- 45.820, -100.700
What these are
- 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.
- 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.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Tornado in Colorado, May 18, 1977
- Tornadoes in Oklahoma, May 18, 1977
- Tornadoes and Hail in Kansas, May 18, 1977
- Tornadoes and Hail in Nebraska, May 18, 1977
- Tornadoes and Damaging Wind in North Dakota, May 18, 1977
- Tornadoes and Hail in Texas, May 18, 1977
- Hail and Damaging Winds in Minnesota, May 18, 1977
- Tornado and Damaging Wind in Iowa, May 18, 1977
- Hail in Pennsylvania, May 18, 1977
More
Every storm in South Dakota in 1977Every state in 1977This day in weather historyThe tornado archive for South Dakota, 1977
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: 10110248, 10110249, 10110250, 10110251, 10110252, 10110253, 10110254, 10110255, 10110256, 10110257, 10110471, 10110472.