Under the influence of a large and anomalous upper low a large cluster of thunderstorms developed in the morning hours and impacted portions of southeast South Carolina. One storm developed near a stationary surface front and produced a short-lived tornado, damaging straight-line wind gusts, and large hail.

Tornado in CHARLESTON, SOUTH CAROLINA
From 20-MAY-20 10:47:00 to 20-MAY-20 10:50:00 (EST-5)
Location: MORRIS ACRES
Tornado F-scale: EF1
Crop damage: 0.00K
Reported by: NWS Storm Survey

A National Weather Service storm survey team determined that an EF1 tornado occurred on Johns Island in Charleston County. The tornado began just south of Chisolm Road and west of Chaineybriar Lane. It continued eastward across the southern portion of Shadberry Lane, and dissipated over Church Creek just southeast of Overlook Road. Along the path of the tornado, most of the damage was due to numerous snapped and uprooted trees. A few homes did sustain mainly minor roof damage due to falling trees and large tree limbs.

Hail in CHARLESTON, SOUTH CAROLINA
From 20-MAY-20 10:42:00 to 20-MAY-20 10:46:00 (EST-5)
Location: YONGES IS
Magnitude: 0.75 
Crop damage: 0.00K
Reported by: NWS Employee

An off duty NWS employee reported penny sized hail on Wadmalaw Island.

Hail in CHARLESTON, SOUTH CAROLINA
From 20-MAY-20 10:50:00 to 20-MAY-20 10:54:00 (EST-5)
Location: MORRIS ACRES
Magnitude: 1.25 
Crop damage: 0.00K
Reported by: Public

Half dollar sized hail was reported on Johns Island.

Hail in CHARLESTON, SOUTH CAROLINA
From 20-MAY-20 11:16:00 to 20-MAY-20 11:20:00 (EST-5)
Location: DUPONT
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Public

Quarter sized hail was reported in the Shadowmoss subdivision.

Hail in CHARLESTON, SOUTH CAROLINA
From 20-MAY-20 12:26:00 to 20-MAY-20 12:30:00 (EST-5)
Location: SCANLONVILLE
Magnitude: 0.88 
Crop damage: 0.00K
Reported by: Broadcast Media

Local broadcast media reported nickel sized hail in Mount Pleasant.

Thunderstorm Wind in CHARLESTON, SOUTH CAROLINA
From 20-MAY-20 10:43:00 to 20-MAY-20 10:44:00 (EST-5)
Location: ROCKVILLE
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Public

The public reported a large tree and traffic light down where Betsy Kerrison Highway turns into Bohicket Road.

Thunderstorm Wind in CHARLESTON, SOUTH CAROLINA
From 20-MAY-20 10:49:00 to 20-MAY-20 10:53:00 (EST-5)
Location: MORRIS ACRES
Magnitude: 60.00 EG
Crop damage: 0.00K
Reported by: NWS Storm Survey

A National Weather Service storm survey team determined that straight line thunderstorm winds damaged trees at scattered locations along Maybank Highway between Angel Oak Road and Oak Grove Road.

Thunderstorm Wind in CHARLESTON, SOUTH CAROLINA
From 20-MAY-20 10:53:00 to 20-MAY-20 10:54:00 (EST-5)
Location: YONGES IS
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: NWS Employee

An off duty NWS employee reported a tree down on Bears Bluff Road near Albers Lane.

Thunderstorm Wind in CHARLESTON, SOUTH CAROLINA
From 20-MAY-20 10:53:00 to 20-MAY-20 10:54:00 (EST-5)
Location: MORRIS ACRES
Magnitude: 60.00 EG
Crop damage: 0.00K
Reported by: NWS Employee

An off duty NWS employee reported approximately 10 trees down near the intersection of Maybank Highway and Dominic Drive.

Hail in CHARLESTON, SOUTH CAROLINA
From 20-MAY-20 11:07:00 to 20-MAY-20 11:11:00 (EST-5)
Location: DUPONT
Magnitude: 0.88 
Crop damage: 0.00K
Reported by: NWS Employee

An off duty NWS employee reported hail up to the size of nickels on Bermuda Stone Road in the Carolina Bay subdivision.