A tornadic thunderstorm tracked eastward into the northern Black Hills from Wyoming. An EF-1 tornado began in Wyoming and moved across west central Lawrence County into Spearfish Canyon before dissipating. Very large hail to baseball size fell from Lead and Deadwood to Tilford and Piedmont, causing significant damage.  The storm continued to be severe as it moved farther east across west central South Dakota, producing wind gusts to 70 mph.

Hail in LAWRENCE, SOUTH DAKOTA
From 29-JUN-18 15:35:00 to 29-JUN-18 15:35:00 (MST-7)
Location: SPEARFISH
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in LAWRENCE, SOUTH DAKOTA
From 29-JUN-18 15:42:00 to 29-JUN-18 15:42:00 (MST-7)
Location: LEAD
Magnitude: 3.00 
Crop damage: 0.00K
Reported by: Public

Hail to the size of baseballs caused significant property damage in Lead.

Hail in LAWRENCE, SOUTH DAKOTA
From 29-JUN-18 15:45:00 to 29-JUN-18 15:45:00 (MST-7)
Location: DEADWOOD
Magnitude: 2.00 
Property damage: 2.00M
Crop damage: 0.00K
Reported by: Law Enforcement

Large hail caused significant property damage in Deadwood. The estimated damage to just public structures is 1.8 million dollars, with total damage in the city much higher.

Hail in LAWRENCE, SOUTH DAKOTA
From 29-JUN-18 16:01:00 to 29-JUN-18 16:01:00 (MST-7)
Location: WHITEWOOD
Magnitude: 1.50 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MEADE, SOUTH DAKOTA
From 29-JUN-18 16:08:00 to 29-JUN-18 16:08:00 (MST-7)
Location: TILFORD
Magnitude: 2.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MEADE, SOUTH DAKOTA
From 29-JUN-18 16:09:00 to 29-JUN-18 16:09:00 (MST-7)
Location: TILFORD
Magnitude: 2.50 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MEADE, SOUTH DAKOTA
From 29-JUN-18 16:18:00 to 29-JUN-18 16:18:00 (MST-7)
Location: PIEDMONT
Magnitude: 2.25 
Crop damage: 0.00K
Reported by: NWS Employee

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

Hail in MEADE, SOUTH DAKOTA
From 29-JUN-18 16:22:00 to 29-JUN-18 16:22:00 (MST-7)
Location: PIEDMONT
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in MEADE, SOUTH DAKOTA
From 29-JUN-18 16:24:00 to 29-JUN-18 16:24:00 (MST-7)
Location: BLACK HAWK
Magnitude: 1.75 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MEADE, SOUTH DAKOTA
From 29-JUN-18 16:30:00 to 29-JUN-18 16:30:00 (MST-7)
Location: PIEDMONT
Magnitude: 3.00 
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in MEADE, SOUTH DAKOTA
From 29-JUN-18 16:40:00 to 29-JUN-18 16:40:00 (MST-7)
Location: ELLSWORTH AFB
Magnitude: 50.00 MG
Crop damage: 0.00K
Reported by: NWS Employee

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 29-JUN-18 16:48:00 to 29-JUN-18 16:48:00 (MST-7)
Location: NEW UNDERWOOD
Magnitude: 50.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 29-JUN-18 17:14:00 to 29-JUN-18 17:14:00 (MST-7)
Location: WASTA
Magnitude: 60.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 29-JUN-18 17:45:00 to 29-JUN-18 17:45:00 (MST-7)
Location: WALL
Magnitude: 54.00 MG
Crop damage: 0.00K
Reported by: RAWS

Tornado in LAWRENCE, SOUTH DAKOTA
From 29-JUN-18 15:20:00 to 29-JUN-18 15:30:00 (MST-7)
Location: CHEYENNE CROSSING
Tornado F-scale: EF1
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado tracked east from Wyoming across the northwestern Black Hills. The tornado snapped trees and caused minor structural damage. The total path length was almost 20 miles.