A twister pulled back part of the roof of the control tower at Joint Base Charleston. Another knocked a home off its pilings on Johns Island.
Two more tornadoes spun off Tropical Storm Irma as it passed the Charleston area Sept. 11. One of them damaged a home on James Island; the other knocked down trees and a fence as it came out of the marsh into Mount Pleasant.
The four twisters confirmed by the National Weather Service in Charleston on Tuesday weren't particularly powerful or long-lived. Only the one on Johns Island had winds stronger than 100 mph. It was on the ground less than two minutes.
But they made their presence known.
The Johns Island tornado "traveled north northwest near the Stono River, snapping a large live oak tree at the trunk and damaging several trees," the report said. "In this area, the tornado also pulled from the ground a well pump and cement anchors for a chain link fence."