A powerful supercell thunderstorm tracked east from Wyoming across southern Butte County, northern Meade County, and into central South Dakota. Very large hail larger than baseballs, along with wind gusts to 90 mph, caused damage across the area.

Thunderstorm Wind in HAAKON, SOUTH DAKOTA
From 29-JUN-18 18:14:00 to 29-JUN-18 18:14:00 (MST-7)
Location: KIRLEY
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts were estimated at 60 mph.

Thunderstorm Wind in HAAKON, SOUTH DAKOTA
From 29-JUN-18 18:20:00 to 29-JUN-18 18:20:00 (MST-7)
Location: KIRLEY
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts were estimated at 60 mph.

Thunderstorm Wind in HAAKON, SOUTH DAKOTA
From 29-JUN-18 18:20:00 to 29-JUN-18 18:20:00 (MST-7)
Location: KIRLEY
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts were estimated at 60 mph.

Thunderstorm Wind in HAAKON, SOUTH DAKOTA
From 29-JUN-18 18:25:00 to 29-JUN-18 18:25:00 (MST-7)
Location: KIRLEY
Magnitude: 70.00 MG
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in ZIEBACH, SOUTH DAKOTA
From 29-JUN-18 18:10:00 to 29-JUN-18 18:10:00 (MST-7)
Location: DUPREE
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

The spotter estimated wind gusts at 60 mph.

Thunderstorm Wind in ZIEBACH, SOUTH DAKOTA
From 29-JUN-18 18:10:00 to 29-JUN-18 18:10:00 (MST-7)
Location: DUPREE
Magnitude: 70.00 EG
Crop damage: 0.00K
Reported by: COOP Observer

A barn was partially destroyed and large tree branches were downed by the strong winds.

Funnel Cloud in BUTTE, SOUTH DAKOTA
From 29-JUN-18 15:20:00 to 29-JUN-18 15:24:00 (MST-7)
Location: BELLE FOURCHE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A funnel cloud was sighted north of Belle Fourche.

Thunderstorm Wind in BUTTE, SOUTH DAKOTA
From 29-JUN-18 15:15:00 to 29-JUN-18 15:15:00 (MST-7)
Location: BELLE FOURCHE
Magnitude: 62.00 MG
Crop damage: 0.00K
Reported by: AWOS

Hail in BUTTE, SOUTH DAKOTA
From 29-JUN-18 15:22:00 to 29-JUN-18 15:22:00 (MST-7)
Location: BELLE FOURCHE AIRPORT
Magnitude: 2.75 
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in BUTTE, SOUTH DAKOTA
From 29-JUN-18 15:36:00 to 29-JUN-18 15:36:00 (MST-7)
Location: BELLE FOURCHE
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Public

Wind gusts were estimated at 70 mph.

Hail in BUTTE, SOUTH DAKOTA
From 29-JUN-18 15:46:00 to 29-JUN-18 15:46:00 (MST-7)
Location: BELLE FOURCHE AIRPORT
Magnitude: 1.50 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BUTTE, SOUTH DAKOTA
From 29-JUN-18 15:49:00 to 29-JUN-18 15:49:00 (MST-7)
Location: NEWELL
Magnitude: 4.50 
Crop damage: 0.00K
Reported by: Public

Very large hail, with a few stones to the size of softballs, damaged an automobile.

Thunderstorm Wind in BUTTE, SOUTH DAKOTA
From 29-JUN-18 15:50:00 to 29-JUN-18 15:50:00 (MST-7)
Location: NEWELL
Magnitude: 79.00 MG
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in BUTTE, SOUTH DAKOTA
From 29-JUN-18 16:10:00 to 29-JUN-18 16:10:00 (MST-7)
Location: HOOVER
Magnitude: 59.00 MG
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in MEADE, SOUTH DAKOTA
From 29-JUN-18 16:28:00 to 29-JUN-18 16:28:00 (MST-7)
Location: MUD BUTTE
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MEADE, SOUTH DAKOTA
From 29-JUN-18 16:54:00 to 29-JUN-18 16:54:00 (MST-7)
Location: OPAL
Magnitude: 3.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 29-JUN-18 17:30:00 to 29-JUN-18 17:30:00 (MST-7)
Location: CREIGHTON
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts were estimated at 60 mph.

Hail in MEADE, SOUTH DAKOTA
From 29-JUN-18 17:24:00 to 29-JUN-18 17:24:00 (MST-7)
Location: HOWES
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in MEADE, SOUTH DAKOTA
From 29-JUN-18 17:24:00 to 29-JUN-18 17:24:00 (MST-7)
Location: HOWES
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

The spotter estimated wind gusts at 60 mph.

Thunderstorm Wind in ZIEBACH, SOUTH DAKOTA
From 29-JUN-18 17:44:00 to 29-JUN-18 17:44:00 (MST-7)
Location: BRIDGER
Magnitude: 55.00 MG
Crop damage: 0.00K
Reported by: Mesonet