Hurricane Sally made landfall near Gulf Shores, AL, as a category 2 hurricane, in the early morning of Wednesday, September 16, 2020, and then weakened and turned to the NE, tracking across the Central Savannah River Area of Georgia, and across Central SC, as a post-tropical area of low pressure, on Thursday, September 17.  Moisture, instability and low level wind shear, associated with the low, provided tornadoes, heavy rain, and flooding.  48-hour rainfall totals of 2 to 6 inches fell across a large portion of the Midlands of SC, with higher rainfall amounts of 6 to almost 9 inches observed across portions of the southern and eastern Midlands from lower Orangeburg Co NE across S Calhoun Co, Sumter Co, Clarendon Co and S Lee Co SC.  A total of 9 confirmed tornadoes occurred in Central SC during the morning and early afternoon of Sept. 17.

Flash Flood in RICHLAND, SOUTH CAROLINA
From 17-SEP-20 11:15:00 to 17-SEP-20 11:40:00 (EST-5)
Location: OLYMPIA MILLS
Flood cause: Heavy Rain
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Mesonet

Stream gages along the Rocky Branch Creek indicated flooding at Main St and Whaley St and along Olympia Ave.

Flash Flood in SUMTER, SOUTH CAROLINA
From 17-SEP-20 13:20:00 to 17-SEP-20 13:50:00 (EST-5)
Location: CANE SAVANNAH
Flood cause: Heavy Rain
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Trained Spotter

Flooding on Trailwood Dr.

Flash Flood in SUMTER, SOUTH CAROLINA
From 17-SEP-20 13:00:00 to 17-SEP-20 13:20:00 (EST-5)
Location: SUMTER
Flood cause: Heavy Rain
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Trained Spotter

Flooding reported on Sassafras Dr, and yards were underwater.

Tornado in RICHLAND, SOUTH CAROLINA
From 17-SEP-20 07:11:00 to 17-SEP-20 07:17:00 (EST-5)
Location: KINGVILLE
Tornado F-scale: EFU
Reported by: State Official

The South Carolina Forestry Commission completed an aerial survey over an area
inaccessible by land. Radar indicated that the tornado likely touched down along the
upper reaches of Lake Marion in far southwest Sumter County, where a debris
signature was first noted on radar. The tornado moved to the NNW to near the
confluence of the Wateree and Congaree Rivers. The tornado continued moving to the
NW along the Congaree River and vicinity where it crossed back and forth between
Calhoun Co and Richland Co before eventually ending in Richland Co within the boundary of Congaree National Park.  This tornado has been assigned an unknown rating as the degree of damage could not be determined from the aerial survey. Radar data was used to help determine the timing and location of the damage.

Tornado in CLARENDON, SOUTH CAROLINA
From 17-SEP-20 10:14:00 to 17-SEP-20 10:15:00 (EST-5)
Location: PAXVILLE
Tornado F-scale: EF0
Reported by: NWS Storm Survey

A National Weather Service storm survey team confirmed an EF-0 tornado, with peak wind speeds of 60 mph, northwest of Manning in Clarendon County, SC. The weak tornado split the truck of a hardwood tree and snapped large branches on several other trees along Bradham Rd just south of W R Simpson Rd.

Tornado in CLARENDON, SOUTH CAROLINA
From 17-SEP-20 09:17:00 to 17-SEP-20 09:19:00 (EST-5)
Location: ST PAUL
Tornado F-scale: EF0
Reported by: NWS Storm Survey

A National Weather Service storm survey team confirmed an EF-0 tornado, with peak wind speeds of 85 mph, northeast of Santee in Clarendon County, SC. The tornado began along the edge of Lake Marion, just west of I-95, near the Adams Landing community. The tornado uprooted several large hardwood trees and snapped large
branches off of other hardwood trees along Scott Lake Road. The tornado then continued northeast across a portion of Lake Marion, then snapped large branches off of several pine trees along Fort Watson Road in the Santee National Wildlife Refuge, before dissipating.

Flash Flood in AIKEN, SOUTH CAROLINA
From 17-SEP-20 09:24:00 to 17-SEP-20 09:50:00 (EST-5)
Location: GRANITEVILLE
Flood cause: Heavy Rain
Property damage: 0.50K
Crop damage: 0.00K
Reported by: CoCoRaHS

Flooding observed on Canal St.

Flash Flood in SUMTER, SOUTH CAROLINA
From 17-SEP-20 13:15:00 to 17-SEP-20 13:30:00 (EST-5)
Location: CANE SAVANNAH
Flood cause: Heavy Rain
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Trained Spotter

Roadway and yard flooding reported in the Idlewild subdivision.  Exact locations not provided.  Times estimated.

Flash Flood in SUMTER, SOUTH CAROLINA
From 17-SEP-20 13:20:00 to 17-SEP-20 13:50:00 (EST-5)
Location: SUMTER
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Public

Public reported, via social media, a roadway washout with sinkhole on US Hwy 15 N near US Hwy 76/378, and provided a photo.  Times estimated.

Heavy Rain in SUMTER, SOUTH CAROLINA
From 17-SEP-20 05:00:00 to 18-SEP-20 05:00:00 (EST-5)
Location: SUMTER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A CoCoRaHS observer reported a 24 hour rainfall amount of 8.65 inches, most of that rain fell during the morning and early afternoon of Thursday, September 17th.

Tornado in SUMTER, SOUTH CAROLINA
From 17-SEP-20 06:58:00 to 17-SEP-20 07:04:00 (EST-5)
Location: PINEWOOD
Tornado F-scale: EFU
Reported by: State Official

The South Carolina Forestry Commission completed an aerial survey over an area
inaccessible by land. Radar indicated that the tornado likely touched down along the
upper reaches of Lake Marion in far southwest Sumter County, where a debris
signature was first noted on radar. The tornado moved to the NNW to near the
confluence of the Wateree and Congaree Rivers. The tornado continued moving to the
NW along the Congaree River and vicinity where it crossed back and forth between
Calhoun Co and Richland Co before eventually ending in Richland Co within the boundary of Congaree National Park.  This tornado has been assigned an unknown rating as the degree of damage could not be determined from the aerial survey. Radar data was used to help determine the timing and location of the damage.

Tornado in CALHOUN, SOUTH CAROLINA
From 17-SEP-20 07:04:00 to 17-SEP-20 07:11:00 (EST-5)
Location: FT MOTTE
Tornado F-scale: EFU
Reported by: State Official

The South Carolina Forestry Commission completed an aerial survey over an area
inaccessible by land. Radar indicated that the tornado likely touched down along the
upper reaches of Lake Marion in far southwest Sumter County, where a debris
signature was first noted on radar. The tornado moved to the NNW to near the
confluence of the Wateree and Congaree Rivers. The tornado continued moving to the
NW along the Congaree River and vicinity where it crossed back and forth between
Calhoun Co and Richland Co before eventually ending in Richland Co within the boundary of Congaree National Park.  This tornado has been assigned an unknown rating as the degree of damage could not be determined from the aerial survey. Radar data was used to help determine the timing and location of the damage.

Flash Flood in LEE, SOUTH CAROLINA
From 17-SEP-20 13:35:00 to 17-SEP-20 14:10:00 (EST-5)
Location: BISHOPVILLE
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Roads were flooded and impassable in the city of Bishopville, including S Heyward St, S Calhoun St, and along Main St.  2 to 4 inches of water entered a duplex on S. Heyward St.  Times estimated.

Tornado in ORANGEBURG, SOUTH CAROLINA
From 17-SEP-20 08:49:00 to 17-SEP-20 08:50:00 (EST-5)
Location: WELLS
Tornado F-scale: EF0
Reported by: NWS Storm Survey

A National Weather Service Survey Team confirmed a weak tornado briefly touched down in eastern Orangeburg County near I-95. The tornado broke large limbs off of trees on Highway 15 near Crossroads Onyx Way and Po Chance Drive.

Flash Flood in AIKEN, SOUTH CAROLINA
From 17-SEP-20 10:20:00 to 17-SEP-20 10:50:00 (EST-5)
Location: WAGENER
Flood cause: Heavy Rain
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Law Enforcement

SCHP reported roadway flooding on Hwy 302 at Warner Lane in Wagener.

Flash Flood in ORANGEBURG, SOUTH CAROLINA
From 17-SEP-20 09:40:00 to 17-SEP-20 10:40:00 (EST-5)
Location: ELLOREE
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

SCHP reported roadway washout on Tee Vee Rd and Cleveland St.  Times estimated.

Heavy Rain in ORANGEBURG, SOUTH CAROLINA
From 16-SEP-20 05:00:00 to 18-SEP-20 05:00:00 (EST-5)
Location: ELLOREE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A CoCoRaHS observer reported a two day rainfall total of 8.52 inches, most of which fell on Thursday, September 17th.

Tornado in SUMTER, SOUTH CAROLINA
From 17-SEP-20 10:43:00 to 17-SEP-20 11:00:00 (EST-5)
Location: BRITTON
Tornado F-scale: EF0
Reported by: NWS Storm Survey

A National Weather Service storm survey team confirmed an EF-0 tornado, with peak winds of 80 mph, east of Sumter in Sumter County, SC. The tornado began near Mims Rd and London Rd, moved northeast parallel to Camp Branch Rd, and turned northward as it crossed Highway 378 near Plowden Mill Rd. The tornado then turned sharply northwest as it crossed E Brewington Rd and the Rocky Bluff Swamp, then dissipated near Florence Highway south of Goza Rd. The weak tornado snapped the trunks of several pine trees, uprooted another pine tree, and snapped several tree limbs along its path.

Tornado in SUMTER, SOUTH CAROLINA
From 17-SEP-20 06:59:00 to 17-SEP-20 07:04:00 (EST-5)
Location: PINEWOOD
Tornado F-scale: EFU
Reported by: NWS Storm Survey

The South Carolina Forestry Commission completed an aerial survey over an area inaccessible by land. The aerial survey found tree damage in a path extending a little over 2 miles in the upper reaches of Lake Marion, generally east of where the Congaree and Wateree Rivers meet and west of Fullers Earth Creek in far southwest Sumter County. This tornado has been assigned an unknown rating as the degree of damage could not be determined from the aerial survey. Radar data was used to help determine the timing and location of the damage.

Tornado in SUMTER, SOUTH CAROLINA
From 17-SEP-20 12:19:00 to 17-SEP-20 12:28:00 (EST-5)
Location: PINEWOOD
Tornado F-scale: EF0
Reported by: NWS Storm Survey

A National Weather Service storm survey team confirmed an EF-0 tornado, with peak wind speeds of 60 mph, north of Pinewood in Sumter County, SC. The tornado began near Highway 261 south of Camp Mac Boykin Rd, moved northeast across Passageway Rd, then dissipated northeast of the intersection of Pinewood Rd and Cox Rd. The weak tornado snapped the trunks of a small pine and hardwood tree.

Flash Flood in ORANGEBURG, SOUTH CAROLINA
From 17-SEP-20 11:26:00 to 17-SEP-20 12:00:00 (EST-5)
Location: NORTH
Flood cause: Heavy Rain
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Law Enforcement

SCHP reported roadway flooding on North Rd at Air Base Rd.  Times estimated.

Flash Flood in ORANGEBURG, SOUTH CAROLINA
From 17-SEP-20 12:38:00 to 17-SEP-20 13:10:00 (EST-5)
Location: BOWMAN
Flood cause: Heavy Rain
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Law Enforcement

SCHP reported roadway flooding at Elm St and Weathers St in Bowman.  Times estimated.

Flash Flood in LEXINGTON, SOUTH CAROLINA
From 17-SEP-20 10:27:00 to 17-SEP-20 11:00:00 (EST-5)
Location: PELION
Flood cause: Heavy Rain
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Trained Spotter

Flooding reported at Fish Hatchery Rd and Patricia Ave.

Tornado in CALHOUN, SOUTH CAROLINA
From 17-SEP-20 11:45:00 to 17-SEP-20 11:46:00 (EST-5)
Location: SINGLETON
Tornado F-scale: EF0
Reported by: NWS Storm Survey

A National Weather Service storm survey team confirmed an EF-0 tornado, with peak wind speeds of 75 mph, east of St. George in Calhoun County, SC. The weak tornado uprooted several hardwood trees and snapped large tree limbs in the vicinity of Longstreet Rd and Darby Rd.

Tornado in CALHOUN, SOUTH CAROLINA
From 17-SEP-20 11:06:00 to 17-SEP-20 11:08:00 (EST-5)
Location: LONE STAR
Tornado F-scale: EF0
Reported by: NWS Storm Survey

A National Weather Service damage survey team confirmed a brief EF-0 tornado, with peak wind speeds of 75 mph, in Lone Star, near the Calhoun-Sumter County Line. The tornado broke large branches off of trees on Low Falls Road and continued north for
about 1 mile. A large tree was uprooted on Shirer Lane, then the tornado lifted shortly after.