But the gravest threat to the USA remains Hurricane Florence, which is expected to strengthen to a major hurricane by Monday night and remain "an extremely unsafe major hurricane" through Thursday, according to the Hurricane Center.
Virginia, North Carolina and SC have all declared states of emergency ahead of the arrival of Florence.
Forecasters at the NHC said Florence would continue to strengthen and "is expected to remain an extremely risky major hurricane through Thursday". The current forecast track suggests the hurricane will most likely approach North Carolina or SC on Thursday as it gathers speed.
In its 11 p.m. Sunday advisory, the National Hurricane Center upgraded Tropical Storm Isaac to a Category 1 hurricane, with winds of almost 75 miles per hour.
The third hurricane in the Atlantic, Hurricane Florence, could pose a danger to parts of the U.S.
North Carolina Governor Roy Cooper´s office said that Florence is already being felt along the state´s coast, with large sea swells resulting in life-threatening rip currents and surf.
The agency said the storm is slated to continue growing in strength and will reach a Category 3 or higher, which constitutes being a "major" hurricane.
A tropical storm becomes a hurricane when maximum sustained winds reach at least 74 miles per hour.
Rick Scott issued a statement warning all Floridians to stay cautious in the event that Hurricane Florence approaches the state, WKMG reported Sunday. The storm is about 195 miles west-southwest of Cabo Verge, an archipelago near the African coast.
Rapidly intensifying Hurricane Florence could strike a direct and risky blow anywhere from the Carolinas to the Mid-Atlantic region later this week.
This enhanced satellite image made available by NOAA shows Tropical Storm Florence, center.