The National Weather Service has issued a tornado watch for 30 counties in North Georgia until 3 a.m., including Hall, Dawson, Forsyth, Gwinnett, Lumpkin, Towns, Union and White.
A tornado watch means conditions are right for tornadoes to form, though none have yet been spotted on the ground or by radar.
The Weather Service says that as a cold front moves across the state, some thunderstorms could be severe and bring strong winds, lightning, heavy rains, hail and the possibility of tornadoes.
New rainfall amounts of up to three-quarters of an inch are possible tonight, with a 90 percent chance of more storms.
A stormy spring Saturday put a crimp in outdoor plans, with more storms likely into Sunday.
The Murrayville Days Parade was a victim of the wet weather, though the annual Gainesville Spring Chicken Festival still was held downtown.
A total of 1.41 inches of rain has been recorded at the NWS automated station at Gainesville's Lee Gilmer Memorial Airport since about 8 a.m. More than 2 inches has been recorded since about 2 a.m.
The chance of showers and storms continues until Sunday afternoon, then diminishes into the evening with gradual clearing. Sunday's high temperature is only expected to reach 77.
The work week will bring only a slight chance of rain but cooler temperatures, with highs in the mid 60s and overnight lows in the upper 40s.
Lake Lanier's water level was at 1,071.15 feet above sea level Saturday, right at full pool.