The National Weather Service has issued a flash flood watch for Clay, Duval and St. Johns counties through Saturday evening.

Heavy showers and thunderstorms could bring two to four inches of rain on top of the five to 10 inches that have fallen the past three days on Northeast Florida, according to meteorologists.

Forecast, radar: jacksonville.com/weather

There is a 90 percent chance of precipitation today. The high should reach 80 with an east wind between 11 and 15 mph.

Low lying areas are particularly vulnerable to fast-rising water. There is a moderate risk of rip currents today.

The Weather Service advises motorists to use caution and avoid water-covered roadways. If your vehicle gets caught in rising water, get out.

Chances of rain will decrease to 60 percent tonight. Sunday, the chance for showers and thunderstorms is 40 percent with a high near 87.