Upper energy and a surface wave of low pressure moved east and interacted with a nearly stationary surface front, which combined with strong atmospheric instability and shear, led to a band of supercells that tracked east across the northern Midlands of SC producing large hail and a tornado.

Thunderstorm Wind in CHESTERFIELD, SOUTH CAROLINA
From 05-MAY-20 03:44:00 to 05-MAY-20 03:50:00 (EST-5)
Location: DUDLEY
Magnitude: 60.00 EG
Reported by: 911 Call Center

Chesterfield Co SC dispatch reported multiple trees down on SC 207 between Pageland and the NC border.  Time estimated.

Hail in LANCASTER, SOUTH CAROLINA
From 05-MAY-20 17:57:00 to 05-MAY-20 18:00:00 (EST-5)
Location: DOUGLAS
Magnitude: 1.50 
Reported by: Public

Public reported ping pong ball size hail in the Edgewater community SW of Lancaster. The report was submitted via social media with a video.

Thunderstorm Wind in LANCASTER, SOUTH CAROLINA
From 05-MAY-20 18:01:00 to 05-MAY-20 18:04:00 (EST-5)
Location: CAUTHENS XRDS
Magnitude: 70.00 EG
Reported by: Trained Spotter

A trained spotter reported a large swath of downed trees near Green Rd and Cedar Creek Rd in SW Lancaster Co SC.

Thunderstorm Wind in LANCASTER, SOUTH CAROLINA
From 05-MAY-20 18:17:00 to 05-MAY-20 18:20:00 (EST-5)
Location: HEATH SPGS
Magnitude: 65.00 EG
Reported by: Trained Spotter

A large tree was downed on Kershaw Camden Hwy (US Hwy 521) between the towns of Heath Springs and Kershaw.

Thunderstorm Wind in LANCASTER, SOUTH CAROLINA
From 05-MAY-20 18:25:00 to 05-MAY-20 18:28:00 (EST-5)
Location: KERSHAW
Magnitude: 65.00 EG
Reported by: Trained Spotter

A tree fell on a house along Matson Rd in the town of Kershaw.

Hail in KERSHAW, SOUTH CAROLINA
From 05-MAY-20 18:50:00 to 05-MAY-20 18:53:00 (EST-5)
Location: BETHUNE
Magnitude: 2.50 
Reported by: Emergency Manager

Kershaw Co SC Emergency Manager reported tennis ball size hail near Bethune.

Hail in KERSHAW, SOUTH CAROLINA
From 05-MAY-20 18:50:00 to 05-MAY-20 18:53:00 (EST-5)
Location: BETHUNE
Magnitude: 2.00 
Reported by: Public

Public reported egg size hail via social media, along with a video and a photo.

Hail in CHESTERFIELD, SOUTH CAROLINA
From 05-MAY-20 19:00:00 to 05-MAY-20 19:02:00 (EST-5)
Location: MC BEE
Magnitude: 1.25 
Reported by: Trained Spotter

Trained spotter reported, via social media with photos included, hail slightly larger than a quarter at 2300 Union Church Rd in McBee.  Time estimated.

Hail in LANCASTER, SOUTH CAROLINA
From 05-MAY-20 19:25:00 to 05-MAY-20 19:28:00 (EST-5)
Location: KERSHAW
Magnitude: 0.75 
Reported by: Public

Public reported, via social media, a photo indicating penny size hail near the town of Kershaw.

Hail in KERSHAW, SOUTH CAROLINA
From 05-MAY-20 19:31:00 to 05-MAY-20 19:34:00 (EST-5)
Location: WESTVILLE
Magnitude: 1.75 
Reported by: Trained Spotter

Trained spotter reported golf ball size hail along Neds Creek Rd in N Kershaw Co. Time estimated.

Thunderstorm Wind in NEWBERRY, SOUTH CAROLINA
From 05-MAY-20 19:55:00 to 05-MAY-20 20:00:00 (EST-5)
Location: KINARDS
Magnitude: 60.00 EG
Reported by: Law Enforcement

SCHP reported tree in roadway on Bush River Rd near Hwy 560 near the Laurens Co line SW of Kinards.  Time estimated.

Thunderstorm Wind in LANCASTER, SOUTH CAROLINA
From 05-MAY-20 18:22:00 to 05-MAY-20 18:25:00 (EST-5)
Location: KERSHAW
Magnitude: 91.00 EG
Reported by: NWS Storm Survey

An NWS Storm Survey determined that a very strong downburst occurred just east of the town of Kershaw along Arbor Dr, just before Woodhaven Rd. The damage was primarily to trees between Arbor Dr and Woodhaven Rd, with many trees uprooted and some snapped. Peak wind gusts were estimated to be near 105 MPH.

Tornado in LANCASTER, SOUTH CAROLINA
From 05-MAY-20 17:58:00 to 05-MAY-20 18:07:00 (EST-5)
Location: CAUTHENS XRDS
Tornado F-scale: EF2
Reported by: NWS Storm Survey

A tornado touched down west of Great Falls in Chester Co SC (see Storm Data for South Carolina, Northwest, for more information on the tornado in Chester Co).  The tornado moved to the SE and crossed into Lancaster Co SC at the Catawba River near Pickett Island.  The tornado strengthened as it crossed the Catawba River and entered SW Lancaster County. The tornado moved to the SE, producing significant tree damage, with numerous large hardwood and softwood trees uprooted or snapped. The most significant damage occurred between Green Rd and Cedar Creek Rd near Mount Carmel Rd where estimated winds were up to 115 mph. A tree also fell on a vehicle on Cedar Creek Rd. The tornado then crossed Cunningham Quarters Rd, before dissipating near Mable Anthony Rd.
This supercell thunderstorm also produced large hail in Chester Co SC (see Storm Data for South Carolina, Northwest) and in Lancaster Co and N Kershaw Co (See Storm Data for South Carolina, Central for additional hail information).