After Nestor lashed Florida, spawning destructive tornadoes, the post-tropical storm downed trees and caused power outages in Georgia Saturday night with heavy rains and powerful winds, WSB-TV reports.The latest: The National Hurricane Center said isolated flash flooding was possible across the southeastern U.S. into Sunday. The National Weather Service issued a tornado warning for Godwinsville, Georgia, and flash-flood alerts for areas in the state including Eastman, Abbeville and Chester.The NHC said at 5pm ET Saturday that gale-force winds would "gradually develop" along the coasts of northeast Florida and Georgia and spread northward to the Carolinas on Sunday.The big picture: Nestor made landfall on St. Vincent Island, Florida, on Friday as a tropical storm. It spun tornadoes with winds of up to 120 mph, which overturned vehicles, tore off roofs and uprooted trees, per the New York Times.Nearly 13,000 customers were without power in Florida at 4:30pm Saturday, according to poweroutage.us. Most of those affected were in Polk County, where an EF-2 tornado "caused a semi truck to overturn onto another vehicle" on I-4 late Friday, ABC News reports.On the plus side, Tropical Storm #Nestor will provide needed #drought relief to southeast U.S. states. #ALwx #GAwx #SCwx #NCwx pic.twitter.com/m1dN30AJFg— UW-Madison CIMSS (@UWCIMSS) October 19, 2019 Go deeper: The Atlantic Basin's tropical storms and hurricanes in 2019 Editor's note: This article has been updated with new details throughout.