A slow moving severe thunderstorm developed over the northern foothills of the Black Hills and drifted slowly southeast to the Rapid City area. Very large hail and strong wind gusts were reported from Piedmont to the north side of Rapid City.

Hail in LAWRENCE, SOUTH DAKOTA
From 18-JUL-16 13:24:00 to 18-JUL-16 13:35:00 (MST-7)
Location: GALENA
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Public

Hail in MEADE, SOUTH DAKOTA
From 18-JUL-16 14:46:00 to 18-JUL-16 15:45:00 (MST-7)
Location: PIEDMONT
Magnitude: 2.25 
Crop damage: 0.00K
Reported by: NWS Employee

Hail from golf ball to almost tennis ball size fell off and on for one hour.

Hail in MEADE, SOUTH DAKOTA
From 18-JUL-16 16:15:00 to 18-JUL-16 16:15:00 (MST-7)
Location: BLACK HAWK
Magnitude: 2.00 
Crop damage: 0.00K
Reported by: Social Media

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 18-JUL-16 17:00:00 to 18-JUL-16 17:00:00 (MST-7)
Location: RAPID CITY
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Strong wind gusts downed tree branches.

Hail in PENNINGTON, SOUTH DAKOTA
From 18-JUL-16 17:08:00 to 18-JUL-16 17:20:00 (MST-7)
Location: RAPID CITY
Magnitude: 1.50 
Crop damage: 0.00K
Reported by: Official NWS Observations

Hail in PENNINGTON, SOUTH DAKOTA
From 18-JUL-16 17:17:00 to 18-JUL-16 17:17:00 (MST-7)
Location: RAPID CITY
Magnitude: 1.50 
Crop damage: 0.00K
Reported by: Social Media

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 18-JUL-16 17:13:00 to 18-JUL-16 17:13:00 (MST-7)
Location: RAPID CITY
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Public

One large cottonwood tree was uprooted and several more were broken.

Hail in PENNINGTON, SOUTH DAKOTA
From 18-JUL-16 17:13:00 to 18-JUL-16 17:13:00 (MST-7)
Location: RAPID CITY
Magnitude: 2.00 
Crop damage: 0.00K
Reported by: Public

Hail in PENNINGTON, SOUTH DAKOTA
From 18-JUL-16 17:16:00 to 18-JUL-16 17:16:00 (MST-7)
Location: RAPID CITY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in MEADE, SOUTH DAKOTA
From 18-JUL-16 16:00:00 to 18-JUL-16 16:00:00 (MST-7)
Location: BLACK HAWK
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in MEADE, SOUTH DAKOTA
From 18-JUL-16 16:14:00 to 18-JUL-16 16:24:00 (MST-7)
Location: BLACK HAWK
Magnitude: 2.00 
Crop damage: 0.00K
Reported by: Public

Reported in the town of Summerset.

Hail in MEADE, SOUTH DAKOTA
From 18-JUL-16 15:20:00 to 18-JUL-16 15:30:00 (MST-7)
Location: TILFORD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Check times. First report was nickel; call made at 1621 MDT. Second report was recorded at 1630 MDT.

Thunderstorm Wind in PENNINGTON, SOUTH DAKOTA
From 18-JUL-16 17:11:00 to 18-JUL-16 17:11:00 (MST-7)
Location: RAPID CITY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Wind gusts were estimated at 60 mph.

Hail in MEADE, SOUTH DAKOTA
From 18-JUL-16 16:23:00 to 18-JUL-16 16:23:00 (MST-7)
Location: BLACK HAWK
Magnitude: 2.50 
Crop damage: 0.00K
Reported by: Social Media

Hail in MEADE, SOUTH DAKOTA
From 18-JUL-16 16:39:00 to 18-JUL-16 16:39:00 (MST-7)
Location: BLACK HAWK
Magnitude: 3.00 
Crop damage: 0.00K
Reported by: Social Media