A long-lived supercell thunderstorm tracked from Montana across Butte and Meade Counties. The storm produced large hail and strong wind gusts, especially over southeastern Butte County. Widespread property damage occurred in Newell, where hail to baseball size and wind gusts to 90 mph were observed.

Thunderstorm Wind in HARDING, SOUTH DAKOTA
From 18-JUL-17 17:10:00 to 18-JUL-17 17:10:00 (MST-7)
Location: HARDING
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Wind gusts were estimated at 60 mph.

Hail in BUTTE, SOUTH DAKOTA
From 18-JUL-17 17:35:00 to 18-JUL-17 17:35:00 (MST-7)
Location: BELLE FOURCHE AIRPORT
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in BUTTE, SOUTH DAKOTA
From 18-JUL-17 17:35:00 to 18-JUL-17 17:35:00 (MST-7)
Location: BELLE FOURCHE AIRPORT
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Public

Wind gusts were estimated at 60 mph.

Hail in BUTTE, SOUTH DAKOTA
From 18-JUL-17 17:57:00 to 18-JUL-17 17:57:00 (MST-7)
Location: CASTLE ROCK
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in BUTTE, SOUTH DAKOTA
From 18-JUL-17 17:57:00 to 18-JUL-17 17:57:00 (MST-7)
Location: CASTLE ROCK
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Public

Wind gusts were estimated at 60 mph.

Hail in BUTTE, SOUTH DAKOTA
From 18-JUL-17 18:25:00 to 18-JUL-17 18:25:00 (MST-7)
Location: NEWELL
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in BUTTE, SOUTH DAKOTA
From 18-JUL-17 18:25:00 to 18-JUL-17 18:25:00 (MST-7)
Location: NEWELL
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

The spotter estimated wind gusts at 60 mph.

Hail in BUTTE, SOUTH DAKOTA
From 18-JUL-17 18:30:00 to 18-JUL-17 18:30:00 (MST-7)
Location: NEWELL
Magnitude: 1.25 
Crop damage: 0.00K
Reported by: Public

Hail in BUTTE, SOUTH DAKOTA
From 18-JUL-17 18:30:00 to 18-JUL-17 18:35:00 (MST-7)
Location: NEWELL
Magnitude: 2.75 
Reported by: Trained Spotter

The combination of hail to baseball size and strong wind gusts damaged automobiles, houses, signs, and other property in town.

Thunderstorm Wind in BUTTE, SOUTH DAKOTA
From 18-JUL-17 18:35:00 to 18-JUL-17 18:50:00 (MST-7)
Location: NEWELL
Magnitude: 81.00 MG
Reported by: Mesonet

Hail in BUTTE, SOUTH DAKOTA
From 18-JUL-17 18:32:00 to 18-JUL-17 18:32:00 (MST-7)
Location: NEWELL
Magnitude: 2.00 
Crop damage: 0.00K
Reported by: Trained Spotter

The spotter also reported 50 mph wind gusts.

Hail in BUTTE, SOUTH DAKOTA
From 18-JUL-17 18:35:00 to 18-JUL-17 18:35:00 (MST-7)
Location: NEWELL
Magnitude: 1.75 
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in BUTTE, SOUTH DAKOTA
From 18-JUL-17 18:35:00 to 18-JUL-17 18:35:00 (MST-7)
Location: NEWELL
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Public

Ten inch diameter tree limbs were broken off trees.

Hail in BUTTE, SOUTH DAKOTA
From 18-JUL-17 18:51:00 to 18-JUL-17 18:51:00 (MST-7)
Location: VALE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MEADE, SOUTH DAKOTA
From 18-JUL-17 19:08:00 to 18-JUL-17 19:08:00 (MST-7)
Location: HEREFORD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in MEADE, SOUTH DAKOTA
From 18-JUL-17 19:08:00 to 18-JUL-17 19:08:00 (MST-7)
Location: HEREFORD
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Public

Wind gusts were estimated at 70 mph.

Thunderstorm Wind in MEADE, SOUTH DAKOTA
From 18-JUL-17 19:25:00 to 18-JUL-17 19:25:00 (MST-7)
Location: UNION CENTER
Magnitude: 59.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in MEADE, SOUTH DAKOTA
From 18-JUL-17 19:30:00 to 18-JUL-17 19:30:00 (MST-7)
Location: HEREFORD
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

The spotter estimated wind gusts at 70 mph.

Thunderstorm Wind in MEADE, SOUTH DAKOTA
From 18-JUL-17 19:35:00 to 18-JUL-17 19:35:00 (MST-7)
Location: HEREFORD
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Wind gusts were estimated at 60 mph.

Thunderstorm Wind in MEADE, SOUTH DAKOTA
From 18-JUL-17 20:00:00 to 18-JUL-17 20:00:00 (MST-7)
Location: ELM SPRINGS
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The spotter estimated wind gusts at 65 mph.