A slow-moving supercell thunderstorm developed along the northeastern foothills of the Black Hills, producing large hail and heavy rain in the Piedmont and Black Hawk area. Very large hail was reported around Piedmont, where significant damage was reported. The storm also produced as much as seven inches of rain in less than three hours. Runoff damaged city and county streets and forced the closure of Interstate-90 for several hours.

Hail in MEADE, SOUTH DAKOTA
From 01-JUN-15 17:55:00 to 01-JUN-15 18:00:00 (MST-7)
Location: PIEDMONT
Magnitude: 4.50 
Property damage: 500.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tennis ball to softball sized hail pummeled Piedmont.

Hail in MEADE, SOUTH DAKOTA
From 01-JUN-15 16:10:00 to 01-JUN-15 16:15:00 (MST-7)
Location: TILFORD
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MEADE, SOUTH DAKOTA
From 01-JUN-15 16:20:00 to 01-JUN-15 16:20:00 (MST-7)
Location: TILFORD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in MEADE, SOUTH DAKOTA
From 01-JUN-15 16:50:00 to 01-JUN-15 16:50:00 (MST-7)
Location: PIEDMONT
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in MEADE, SOUTH DAKOTA
From 01-JUN-15 17:19:00 to 01-JUN-15 17:19:00 (MST-7)
Location: PIEDMONT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in MEADE, SOUTH DAKOTA
From 01-JUN-15 17:20:00 to 01-JUN-15 17:20:00 (MST-7)
Location: PIEDMONT
Magnitude: 2.00 
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Public

Hail in MEADE, SOUTH DAKOTA
From 01-JUN-15 17:25:00 to 01-JUN-15 17:25:00 (MST-7)
Location: PIEDMONT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in MEADE, SOUTH DAKOTA
From 01-JUN-15 18:12:00 to 01-JUN-15 18:12:00 (MST-7)
Location: PIEDMONT
Magnitude: 2.50 
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in MEADE, SOUTH DAKOTA
From 01-JUN-15 18:15:00 to 01-JUN-15 18:30:00 (MST-7)
Location: BLACK HAWK
Magnitude: 1.75 
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Public

Hail in MEADE, SOUTH DAKOTA
From 01-JUN-15 18:00:00 to 01-JUN-15 18:30:00 (MST-7)
Location: BLACK HAWK
Magnitude: 2.75 
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Public

Hail up to baseball size fell for approximately 30 minutes.

Hail in MEADE, SOUTH DAKOTA
From 01-JUN-15 18:35:00 to 01-JUN-15 18:35:00 (MST-7)
Location: PIEDMONT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PENNINGTON, SOUTH DAKOTA
From 01-JUN-15 19:15:00 to 01-JUN-15 19:15:00 (MST-7)
Location: JOHNSON SIDING
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flash Flood in MEADE, SOUTH DAKOTA
From 01-JUN-15 18:10:00 to 01-JUN-15 23:00:00 (MST-7)
Location: TILFORD
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flash flooding occurred in the Piedmont area. Interstate 90 near mile marker 44 and Sturgis Road in Piedmont were covered with a few inches of water.  Several streets, buildings, and homes in Piedmont were damaged by the water, including Piedmont Valley Elementary School, which sustained significant damage.

Flash Flood in MEADE, SOUTH DAKOTA
From 01-JUN-15 19:35:00 to 01-JUN-15 22:00:00 (MST-7)
Location: BLACK HAWK
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flash flooding occurred in Black Hawk when Box Elder Creek overflowed its banks. The flood waters closed the driving lane of eastbound I-90.

Flood in MEADE, SOUTH DAKOTA
From 01-JUN-15 22:00:00 to 03-JUN-15 01:00:00 (MST-7)
Location: PIEDMONT
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: NWS Employee

Flooding along Elk Creek inundated yards, houses, and roads in the Golden Valley Subdivision; covered Elk Creek Road between Elk Vale Road and Antelope Creek Road; and flooded agricultural land.