Scattered afternoon and evening thunderstorms developed in association with a surface trough and an unseasonably warm and moist air mass across Upstate South Carolina. Multiple supercell thunderstorms produced large hail across the foothills. Greenville County was especially hard it, mainly in the Eastside and Greer areas, as training severe thunderstorms produced multiple hail swaths, with stones up to the size of baseballs causing extensive damage to vehicles and structures.

Thunderstorm Wind in OCONEE, SOUTH CAROLINA
From 21-MAR-17 17:40:00 to 21-MAR-17 17:40:00 (EST-5)
Location: TAMASSEE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

County comms reported trees blown down near the intersection of Flat Shoals Rd and Horseshoe Lane.

Hail in GREENVILLE, SOUTH CAROLINA
From 21-MAR-17 17:45:00 to 21-MAR-17 17:45:00 (EST-5)
Location: TAYLORS
Magnitude: 2.50 
Reported by: Public

Public reported between tennis ball and baseball size 2.5 inch hail at Hudson Rd and Old Spartanburg Rd.

Hail in GREENVILLE, SOUTH CAROLINA
From 21-MAR-17 17:55:00 to 21-MAR-17 17:55:00 (EST-5)
Location: BATESVILLE
Magnitude: 2.50 
Reported by: Social Media

Public reported (via Social Media) 2.5 inch diameter hail on Shelter Dr. Numerous other reports were received on I-85 near Highway 14 and GSP Airport, with windshields shattered on multiple vehicles.

Hail in SPARTANBURG, SOUTH CAROLINA
From 21-MAR-17 18:05:00 to 21-MAR-17 18:05:00 (EST-5)
Location: GRNVL SPRTNBRG ARPT
Magnitude: 3.00 
Reported by: Social Media

Public (via Social Media) reported 3-inch diameter hail on I-85 just south of the GSP Airport.

Hail in SPARTANBURG, SOUTH CAROLINA
From 21-MAR-17 18:00:00 to 21-MAR-17 18:05:00 (EST-5)
Location: GRNVL SPRTNBRG ARPT
Magnitude: 1.75 
Reported by: Social Media

A second round of golf ball sized hail was observed at the National Weather Service. Public also reported golf ball size hail damaging vehicles at a manufacturing plant at Highway 101 and I-85.

Hail in GREENVILLE, SOUTH CAROLINA
From 21-MAR-17 17:25:00 to 21-MAR-17 17:25:00 (EST-5)
Location: TRAVELERS REST
Magnitude: 2.00 
Reported by: Social Media

Public reported (via Social Media) 2-inch diameter hail reported off Mosteller Rd.

Hail in GREENVILLE, SOUTH CAROLINA
From 21-MAR-17 17:45:00 to 21-MAR-17 17:45:00 (EST-5)
Location: GREENVILLE-SPARTANBU
Magnitude: 2.00 
Reported by: Social Media

Public reported (via Social Media) 2-inch diameter hail near Buena Vista Elementary.

Hail in GREENVILLE, SOUTH CAROLINA
From 21-MAR-17 15:49:00 to 21-MAR-17 17:15:00 (EST-5)
Location: TIGERVILLE
Magnitude: 1.75 
Reported by: Public

Numerous sources reported that the first in a series of severe thunderstorms produced up to golf ball size hail from Tigerville, through Taylors and the Eastside.

Hail in OCONEE, SOUTH CAROLINA
From 21-MAR-17 16:11:00 to 21-MAR-17 16:11:00 (EST-5)
Location: COURTENAY
Magnitude: 1.00 
Reported by: Public

DOT reported up to quarter size hail at High Falls County Park.

Hail in SPARTANBURG, SOUTH CAROLINA
From 21-MAR-17 16:21:00 to 21-MAR-17 16:21:00 (EST-5)
Location: CAMPTON
Magnitude: 1.00 
Reported by: Public

Public reported quarter size hail near Boiling Springs.

Hail in OCONEE, SOUTH CAROLINA
From 21-MAR-17 16:45:00 to 21-MAR-17 16:45:00 (EST-5)
Location: TAMASSEE
Magnitude: 1.00 
Reported by: 911 Call Center

County comms reported quarter sized hail at Oconee Station State Historic Site.

Hail in GREENVILLE, SOUTH CAROLINA
From 21-MAR-17 16:50:00 to 21-MAR-17 16:50:00 (EST-5)
Location: TIGERVILLE
Magnitude: 1.50 
Reported by: Public

Public reported ping pong ball size hail at North Greenville College.

Hail in GREENVILLE, SOUTH CAROLINA
From 21-MAR-17 16:50:00 to 21-MAR-17 16:50:00 (EST-5)
Location: TAYLORS
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

NWS employee reported 2-inch diameter hail on Overcup Ct.

Hail in GREENVILLE, SOUTH CAROLINA
From 21-MAR-17 17:05:00 to 21-MAR-17 18:00:00 (EST-5)
Location: LOCUST HILL
Magnitude: 1.75 
Reported by: Official NWS Observations

Numerous sources reported hail up to the size of golf balls associated with a second severe thunderstorm that tracked from the Travelers Rest/Tigerville/Taylors area to Greer. The storm followed a very similar path to the first one and again caused significant damage to structures and vehicles.

Hail in SPARTANBURG, SOUTH CAROLINA
From 21-MAR-17 17:20:00 to 21-MAR-17 17:20:00 (EST-5)
Location: GRNVL SPRTNBRG ARPT
Magnitude: 1.75 
Reported by: Official NWS Observations

Golf ball size hail was observed at the National Weather Service.

Hail in SPARTANBURG, SOUTH CAROLINA
From 21-MAR-17 17:36:00 to 21-MAR-17 17:36:00 (EST-5)
Location: FINGERVILLE
Magnitude: 1.00 
Reported by: 911 Call Center

Spotter relayed report of quarter size hail.