Hail, Codington
- When
- May 9, 4:50 PM CST
- Where
- Codington County, Watertown
- Measured
- 0.88 in hail
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 44.900, -97.100
Tornado and Hail in South Dakota, May 9, 1999
9 hail, 3 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
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 13
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.
The radar
The Aberdeen radar (KABR), 120 km away, was scanning. The volume nearest the first event began at 22:50 UTC.
Event by event
9 hail, 3 thunderstorm wind, 1 tornado. Local standard time, as filed.
Thunderstorm Wind, Grant
- When
- May 9, 5:20 PM CST
- Where
- Grant County, 6 mi N of Revillo
- Measured
- 61 kt (70 mph)
- Reported by
- NEWSPAPER
- Coordinates
- 45.100, -96.580
Winds gusting to 70 mph knocked over a 4000 bushel holding bin. The holding bin smashed a propane tank and damaged a smaller grain bin.
Hail, Roberts
- When
- May 9, 5:49 PM CST
- Where
- Roberts County, Wilmot
- Measured
- 1 in hail
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 45.400, -96.870
Hail, Grant
- When
- May 9, 6:00 PM CST
- Where
- Grant County, 4 mi W of Twin Brooks
- Measured
- 0.75 in hail
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 45.200, -96.880
Hail, Roberts
- When
- May 9, 6:05 PM CST
- Where
- Roberts County, 4 mi NE of Victor
- Measured
- 1 in hail
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 45.900, -96.770
Hail, Lyman
- When
- May 9, 7:23 PM CST
- Where
- Lyman County, Presho
- Measured
- 1 in hail
- Reported by
- TRAINED SPOTTER
- Coordinates
- 43.900, -100.050
Hail, Lyman
- When
- May 9, 7:30 PM CST to 7:35 PM CST
- Where
- Lyman County, 6 mi SE of Kennebec
- Measured
- 1.5 in hail
- Reported by
- TRAINED SPOTTER
- Coordinates
- 43.830, -99.780
Hail, Lyman
- When
- May 9, 7:35 PM CST to 8:15 PM CST
- Where
- Lyman County, 6 mi SE of Kennebec
- Measured
- 1 in hail
- Reported by
- TRAINED SPOTTER
- Coordinates
- 43.830, -99.780
Hail, Hughes
- When
- May 9, 7:45 PM CST
- Where
- Hughes County, Blunt
- Measured
- 1 in hail
- Reported by
- TRAINED SPOTTER
- Coordinates
- 44.520, -99.980
Hail, Lyman
- When
- May 9, 8:40 PM CST
- Where
- Lyman County, Kennebec
- Measured
- 0.88 in hail
- Reported by
- TRAINED SPOTTER
- Coordinates
- 43.900, -99.870
Thunderstorm Wind, Lyman
- When
- May 9, 8:43 PM CST
- Where
- Lyman County, Kennebec
- Measured
- 56 kt (64 mph)
- Reported by
- TRAINED SPOTTER
- Coordinates
- 43.900, -99.870
Tornado, Lyman
- When
- May 9, 8:45 PM CST to 8:46 PM CST
- Where
- Lyman County, 3 mi S of Reliance
- Rating
- F0
- Path length
- 0.1 mi
- Path width
- 10 yd
- Reported by
- LAW ENFORCEMENT
- Coordinates
- 43.830, -99.600
A weak tornado touched down briefly three miles south of Reliance with no damage reported. Path length and width were estimated.
Thunderstorm Wind, Buffalo
- When
- May 9, 9:45 PM CST
- Where
- Buffalo County, 6 mi SW of Gann Vly
- Measured
- 70 kt (81 mph)
- Reported by
- EMERGENCY MANAGER
- Coordinates
- 43.970, -99.080
Winds gusting to 80 mph blew over and damaged several grain bins and snapped off several trees.
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
- Tornadoes and Flash Flood in Texas, May 9, 1999
- Hail and Damaging Winds in Oklahoma, May 9 to 10, 1999
- Damaging Winds in Iowa, May 9, 1999
- Tornadoes and Flash Flooding in South Dakota, May 9 to 26, 1999
- Hail and Damaging Winds in Tennessee, May 9 to 23, 1999
- Tornado and Hail in Oklahoma, May 9 to 10, 1999
- Damaging Wind in Texas, May 9, 1999
- Tornado and Flash Flood in Texas, May 9, 1999
- Hail in Florida, May 9, 1999
- Hail and Damaging Wind in Texas, May 9, 1999
- Flooding in South Dakota, May 9 to 31, 1999
- High Wind in Alaska, May 9 to 11, 1999
More
Every storm in South Dakota in 1999Every state in 1999This day in weather historyThe tornado archive for South Dakota, 1999Warnings in South Dakota, May 1999
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: 5699980, 5699987, 5699977, 5699979, 5699978, 5699981, 5699988, 5699989, 5699982, 5699984, 5699983, 5699985, 5699986.