It is moving to the west-northwest at 17 miles per hour.
Forecasters say Tropical Storm Florence has turned into a hurricane and is swirling toward the East Coast for what could be a direct hit toward the end of the week. A tropical storm becomes a hurricane when maximum sustained winds reach at least 74 miles per hour.
Panovich said he expects Florence to approach the southeast coast on Thursday.
A Category 4 hurricane would have sustained winds of 130-156 miles per hour, the National Hurricane Center says.
Isaac is forecast to become a hurricane by Sunday evening or Monday. It is now 1,305 miles east of the Windward Islands, which are in the West Indies, and moving westward at 14 mph.
News of Tropical Storm Isaac comes only days ahead of the 30th anniversary of Hurricane Gilbert making landfall and ravaging Jamaica on September 12, 1988.
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The storm could hit the southeastern USA coast by late this week as a Category 3 storm or higher, bringing life-threatening winds, flooding, and storm surge.
The U.S. East Coast could be hit with a powerful hurricane next week as Tropical Storm Florence continues to strengthen as it moves toward the mainland, forecasters said Saturday.
'There is an increasing risk of two life-threatening impacts from Florence: storm surge at the coast and freshwater flooding from a prolonged heavy rainfall event inland, ' the National Hurricane Center said at 11am.
Issac is expected to gain strength in the next days, but then weaken by the middle of the week when it approaches the Caribbean. The storm's maximum sustained winds are 65 miles per hour (100 kph) and it is moving west at 14 miles per hour (22 kph).
"Accordingly, I am declaring a state of emergency so that we can begin to prepare state assets, and I encourage Virginians to monitor forecasts and make their own preparations now".
Norwegian Dawn, with a guest capacity of 2,300, was originally supposed to travel to Bermuda, but swept into Halifax on Sunday morning instead - an itinerary change thanks to hurricane Florence.
While the track of Tropical Storm Florence is still uncertain, it appears increasingly likely that Virginia may see significant impacts from this storm next week.