National Weather Service United States Department of Commerce
Severe Downburst Impacts Summerville and Ladson Areas - June 10, 2024
Start Time End Time Max Wind Speed Max Damage Width Damage Length Fatalities Injuries
7:42 PM EDT 7:58 PM EDT 80 to 85 mph 3.5 miles 8.5 miles 0 1

A supercell thunderstorm developed near the Savannah River during the afternoon of Monday June 10th and tracked northeastward through the early evening hours. This thunderstorm produced a long swath of very strong winds as it crossed inland portions of the Charleston Metro area, with widespread wind damage reported from around the intersection of Dorchester Rd and Boone Hill Rd to St. James Ave. The supercell also produced up to 2 inch hail (the size of a hen egg) as it was moving through the Charleston Tri-County area.

Cross Section of Radar Reflectivity
Above: The radar cross section shows reflectivity values in excess of 65 dBZ (purple) above 25 kft with values of 30 dBZ (green) at 40 kft when the storm was over portions of Beaufort and Collection Counties. As the storm tracked from Colleton County into southern Dorchester County, reflectivity increased to 72 dBZ (white) and storm height appeared to peak around 45 kft. (Note: Radar reflectivity values greater than 65 dBZ is commonly associated with large hail). The storm began to rapidly collapse as it approached the Summerville and Ladson areas, with echo tops falling below 20 kft. The storm collapse coincided with numerous large hail reports and increasing Doppler wind velocity on the lowest radar scan. 
Doppler radar velocity from 7:42 PM - June 10th, 2024
Above: Doppler radar storm relative velocity from 7:42 PM EDT. This velocity data indicates a clear divergent pattern (red represents winds blowing away from the radar and green represents winds blowing towards the radar), showing the position of the damaging straight-line winds or macroburst. The white arrows indicate the wind direction. The blue line with blue arrows indicates the position of the thunderstorm's gust front.

The survey found isolated to scattered damage from areas around Old Trolley Rd and Bacons Bridge Rd northeastward through southern and eastern portions of Summerville to around Main St. on the north side of Sangaree. Most of this damage consisted of large softwood trees snapped and uprooted and some hardwood tree limbs snapped. However, two areas of extensive damage were also found around the Quail Arbor Neighborhood off Old Trolley Rd and around Wisteria St and the Tall Pines Neighborhood along I-26 on the north side of Ladson. Within these two areas, both soft and hard wood trees were observed to have snapped near the trunks, several of which fell on residences and vehicles. A woman was injured when a tree fell on her residence on College Park Drive. Additionally, some damage to residential property was observed, including shingles and siding blown off and privacy fences blown down. Based on a uniform damage direction of generally north to northeast, a strong downburst producing damaging straight line winds is the most likely cause of the damage.

Radar Images (click on the X below to enlarge)

KCLX 0.3° Reflectivity
KCLX 0.3° Velocity (SRM)

Collection of Storm Reports (click image to enlarge)

Map of storm reports

Collection of storm reports from across southeast Georgia and South Carolina: Link

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