An area of heavy rainfall producing thunderstorms developed before sunrise across portions of southeast South Carolina. These thunderstorms developed near the center of a weak area of low pressure that slowly moved eastward through mid morning.
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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 CHS wrote it up.
An area of heavy rainfall producing thunderstorms developed before sunrise across portions of southeast South Carolina. These thunderstorms developed near the center of a weak area of low pressure that slowly moved eastward through mid morning. As the thunderstorms trained across portions of central Colleton County, intense rainfall occurred with radar rainfall estimates of 6 to 9 inches. Flash flooding occurred with portions of two roads washed out and damage to a nearby bridge.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Charleston, SC wrote its last area forecast discussion before the first event at Jul 28, 6:00 AM EST, 2 hours 15 minutes earlier.
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</html>The Charleston,SC radar (KCLX), 46 km away, was scanning. The volume nearest the first event began at 13:12 UTC.
1 thunderstorm wind, 1 flash flood. Local standard time, as filed.
Colleton County Fire and Rescue reported a tree down on a residence on Dandridge Road. Very heavy rain and saturated soils, in addition to gusty winds, likely contributed to the fallen tree.
Colleton County Emergency Management reported damage to three different roads in the county. The most significant flash flooding occurred near 2363 Hendersonville Highway (Highway 17-A) where a large portion of the roadway collapsed and washed out. The wash out occurred near a retention pond that possibly overflowed its banks and overwhelmed the drainage pipe under the roadway. A vehicle traveling northbound on Hendersonville Highway fell into the washout but the two travelers inside were uninjured. The second roadway washout occurred nearby on Great Swamp Road near Dover Bluff Lane. A third instance of damage due to flash flooding occurred northeast of Walterboro on Industrial Lane where it crosses Ireland Creek between Highway 15 and Thunderbolt Drive. A partial washout occurred surrounding the Industrial Lane bridge across Ireland Creek and the road was determined not to be safe for travel. Minor roadway flooding also occurred in Walterboro including Ivanhoe Road and Robertson Boulevard.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Carolina in 2021Every state in 2021This day in weather historyWarnings in South Carolina, July 2021
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 2026-09-24. Each event’s entry at NCEI: 966133, 966131.