Severe thunderstorms developed over Jackson County and eventually turned into a line of storms as they moved across south central South Dakota. The storms produced large hail and strong winds across the area. Heavy rainfall up to three inches in central Jackson County caused minor flooding.

Hail in JACKSON, SOUTH DAKOTA
From 08-JUN-18 15:00:00 to 08-JUN-18 15:05:00 (MST-7)
Location: INTERIOR
Magnitude: 2.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in JACKSON, SOUTH DAKOTA
From 08-JUN-18 15:40:00 to 08-JUN-18 15:40:00 (MST-7)
Location: WANBLEE
Magnitude: 59.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Hail in JACKSON, SOUTH DAKOTA
From 08-JUN-18 16:18:00 to 08-JUN-18 16:18:00 (MST-7)
Location: LONG VALLEY
Magnitude: 1.75 
Crop damage: 0.00K
Reported by: Social Media

Thunderstorm Wind in JACKSON, SOUTH DAKOTA
From 08-JUN-18 16:23:00 to 08-JUN-18 16:23:00 (MST-7)
Location: WANBLEE
Magnitude: 50.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Hail in MELLETTE, SOUTH DAKOTA
From 08-JUN-18 18:06:00 to 08-JUN-18 18:06:00 (CST-6)
Location: NORRIS
Magnitude: 1.25 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BENNETT, SOUTH DAKOTA
From 08-JUN-18 17:31:00 to 08-JUN-18 17:31:00 (MST-7)
Location: VETAL
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in TODD, SOUTH DAKOTA
From 08-JUN-18 19:09:00 to 08-JUN-18 19:09:00 (CST-6)
Location: MISSION
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts were estimated at 60 mph.

Thunderstorm Wind in TRIPP, SOUTH DAKOTA
From 08-JUN-18 19:44:00 to 08-JUN-18 19:44:00 (CST-6)
Location: WITTEN
Magnitude: 50.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in TRIPP, SOUTH DAKOTA
From 08-JUN-18 19:45:00 to 08-JUN-18 19:45:00 (CST-6)
Location: IDEAL
Magnitude: 55.00 MG
Crop damage: 0.00K
Reported by: Storm Chaser

Thunderstorm Wind in TRIPP, SOUTH DAKOTA
From 08-JUN-18 20:04:00 to 08-JUN-18 20:04:00 (CST-6)
Location: HAMILL
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts were estimated around 60 mph.

Thunderstorm Wind in TRIPP, SOUTH DAKOTA
From 08-JUN-18 20:05:00 to 08-JUN-18 20:05:00 (CST-6)
Location: HAMILL
Magnitude: 54.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in TRIPP, SOUTH DAKOTA
From 08-JUN-18 20:30:00 to 08-JUN-18 20:35:00 (CST-6)
Location: COLOME
Magnitude: 52.00 MG
Crop damage: 0.00K
Reported by: Storm Chaser

Thunderstorm Wind in TRIPP, SOUTH DAKOTA
From 08-JUN-18 21:04:00 to 08-JUN-18 21:04:00 (CST-6)
Location: WEWELA
Magnitude: 50.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Flash Flood in JACKSON, SOUTH DAKOTA
From 08-JUN-18 16:30:00 to 08-JUN-18 19:00:00 (MST-7)
Location: CEDAR PASS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Up to three inches of rain fell in a couple of hours along and near the White River in central Jackson County. Runoff from the heavy rain caused Pass Creek, Long Creek, Craven Creek, and Eagle Nest Creek to overflow their banks and flowed over Pass Creek Road. The White River south of Kadoka at SD Highway 73 quickly rose about eight feet and peaked around 8700 cfs due to the excessive runoff.