An upper trough axis remained just to the west of the forecast area with a stalled frontal boundary across the Midlands which became a focus for convection on the afternoon of 8/4. Strong instability developed by the afternoon with surface based CAPE values around 3000 J/kg, although wind shear remained weak, less than 25 knots.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS CAE wrote it up.
An upper trough axis remained just to the west of the forecast area with a stalled frontal boundary across the Midlands which became a focus for convection on the afternoon of 8/4. Strong instability developed by the afternoon with surface based CAPE values around 3000 J/kg, although wind shear remained weak, less than 25 knots. Mid level flow parallel to the northeast-southwest oriented frontal boundary increased the threat of training storms and flash flooding. Pre-existing extreme soil moisture from previous days of heavy rain significantly lowered flash flood guidance across parts of Richland county where flash flooding was again observed for the second consecutive day.
The Columbia radar (KCAE), 26 km away, was scanning. The volume nearest the first event began at 21:41 UTC.
3 thunderstorm wind, 2 flash flood. Local standard time, as filed.
SCHP reported flooding of North Pines Rd near Summer Pines Dr due to creeks overflowing the road.
SCHP reported a tree down along Fairfield Rd at Crane Church Rd. Time estimated by radar.
Trained spotter reports multiple large trees down near the intersection of E Columbia Ave and James St. Time estimated by radar.
SCHP reported a tree down along Fairfield Rd at I-20.
SCHP reported flooding over Dubard Boyle Rd due to the creek overflowing its banks and flowing over the road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Carolina in 2024Every state in 2024This day in weather historyWarnings in South Carolina, August 2024
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 1193475, 1193479, 1193481, 1193480, 1193477.