The National Weather Service has issued a flood advisory until 3 p.m. today for minor flooding of poor drainage areas in south central Berkeley County and central Charleston County.

At 12:51 p.m., Weather Service Doppler radar indicated heavy rain occurring near Mount Pleasant's Waterfront Park and over downtown Charleston. The storm was moving southwest at 5 mph.

Clusters of showers and thunderstorms will be slow moving early this afternoon and occasionally repeat over areas that have seen

downpours earlier in the day, the Weather Service said.

Some places could see 1 to 3 inches of rainfall or more.

Locations in the advisory area include Waterfront Park, Patriots Point, Columbus Street Terminal, Charleston, downtown Charleston, Medical University of South Carolina, The Citadel, and parts of West Ashley.

The heavy rain in downtown Charleston will result in nuisance flooding of low-lying areas.

Areas most prone to flooding include the City Market area, the Crosstown, East Bay Street and Morrison Drive.

Drivers should slow down when traveling and allow extra distance between vehicles. Don't drive into water of unknown depth.