CHARLESTON — Record-breaking amounts of rainfall from a stalled cold front coincided with high tides and already-saturated soil to produce flash flooding that closed dozens of roads and damaged numerous vehicles and structures this weekend.
The widespread showers and thunderstorms that hovered over the Lowcountry on Aug. 22 and Aug. 23 handily surpassed previous rainfall records that were set decades ago, according to an Aug. 24 update from the National Weather Service (NWS).
Throughout the two-day storm, much of the Charleston area was engulfed by an “impressive” 8 to 12 inches of rainfall, said Steven Taylor, a lead meteorologist with the Charleston National Weather Service.
In particular, a gauge at the Charleston International Airport recorded 4.16 inches of rainfall on Friday. And a spot on Charleston’s peninsula was inundated with 4.10 inches on Friday and 3.95 inches of rainfall on Saturday, according to the NWS.
The precipitation also corresponded with high tides and fell on ground that was already sodden, which is something to keep an eye out for throughout the next three months of the Atlantic hurricane season, Taylor said.
August has been a damp month for the Lowcountry, which has seen between 15 and 25 inches of precipitation so far, according to a local nonprofit group that measures and reports rainfall.
That, coupled with moderate flood-level tides, clogged up the systems that drain water, “setting the stage” for the excessive rainfall to stick around on Charleston’s streets, Taylor said.
“The water literally has nowhere to drain to,” Taylor said.
Any type of tropical system, especially slow-moving fronts, could exacerbate these existing conditions and bring the same impacts, he said.
However, residents and tourists alike are expected to catch a break this week.
The weather is poised to be much drier than the past several weeks have been, Taylor said. Temperatures should hover in the mid-80s.