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Rainfall record broken in downtown Charleston but drier conditions are ahead

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After record-setting rainfall in downtown Charleston, conditions are set to be drier through Saturday.

The Charleston peninsula received 3.82 inches of rain as of early Wednesday night, breaking the record of 1.68 inches set on June 12, 1962, according to the National Weather Service. 

More rain was possible but conditions were not expected to be as intense as the torrential downpour seen during daytime hours, said Emily McGraw, a meteorologist with the Weather Service's Charleston office.  

The afternoon's heavy rain led to flooding on multiple roads and to early closure of multiple government buildings. 

The flooding was particularly remarkable considering it didn't occur at high tide. In past flooding events, problems from rainfall were exacerbated by a high tide, which can block water from draining into the region's rivers.

Earlier in the day, the city of Charleston activated its Public Safety Operation Center in anticipation of potentially dangerous stormy conditions and flash flooding.

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Traffic moves slowly through the flooded street on Calhoun Wednesday, June 12, 2019 in Charleston. Grace Beahm Alford/Staff

City officials began preparing for Wednesday’s storm on Monday, according to Charleston's Emergency Management Director Shannon Scaff.

Twice each week, Scaff speaks to the National Weather Service about upcoming weather events. Those calls increased this week as predictions of heavy rainfall were expected.

A storm band that passed through the area around 11 a.m. added 3 inches of water on the peninsula, he said. Some cars stalled in the rising water and a tree fell on James Island. No significant injuries were reported and an officer cleared the fallen tree.

City officials ramped up resources and went into "high alert," deploying police officers to key intersections, vacuum trucks and pumps, Scaff said.

Much of the rain was largely the result of a low-pressure system traveling northeast along the coast, according to the National Weather Service.

Hurricane Wire is a pop-up newsletter during hurricane season that delivers anyone who lives on the East Coast all the information they need to know as storms brew in the Atlantic and beyond.

Climate scientists have documented that as average temperatures around the globe rise, so will the likelihood of intense, drenching rain events. Simply, a warmer atmosphere is able to hold more water.

This provides a challenge to low-lying areas like Charleston and the rest of the Lowcountry. If the rate of rain coming down exceeds the rate at which sewers and drains can evacuate it, flooding ensues. And in many cases, traditional municipal stormwater systems were not built for the amount of rain that's now arriving more frequently.

How Charleston will tackle its next drainage project after $43M Crosstown overrun

Charleston is working on a massive tunnel and pump system designed to keep water off of the Crosstown, one of the city's most important downtown thoroughfares, but that project will not be complete until at least 2024.

Flooding subsided through late afternoon and by roughly 5:15 p.m., main thoroughfares into and out of the city had reopened, said Charles Francis, a Charleston Police Department spokesman.

Despite the record-setting rain, 2019 remains a drier than usual year for the Charleston area.

Since the beginning of the year, 11.42 inches of rain has fallen in downtown Charleston — 3.61 inches below normal, according to the Weather Service. At Charleston International Airport, which did not break its precipitation record for Wednesday, 13.42 inches had fallen since Jan. 1 — 4.86 inches below normal. 

The rest of the week will bring much less storm conditions to the area. 

Thursday will see partly sunny conditions with a high of 87 degrees, according to the Weather Service. Nightfall will bring a 20 percent chance of showers and thunderstorms before 11 p.m.

Friday and Saturday are both expected to be sunny with highs in the mid-80s, according to the Weather Service. The forecast does not call for rain until Sunday, when there is a 20 percent chance.

Chloe Johnson and Mikaela Porter contributed to this report.

Reach Michael Majchrowicz at 843-937-5591. Follow him on Twitter @mjmajchrowicz.

Reach Gregory Yee at 843-937-5908. Follow him on Twitter @GregoryYYee.

Michael Majchrowicz is a reporter covering crime and public safety. He previously wrote about courts for the Daily Hampshire Gazette in Northampton, Massachusetts. A Hoosier native, he graduated from Indiana University with a degree in journalism.

Gregory Yee covers breaking news and public safety. He's a native Angeleno and previously covered crime and courts for the Press-Telegram in Long Beach, CA. He studied journalism and Spanish literature at the University of California, Irvine.

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