The storm remained a Category 2 hurricane with maximum sustained winds of 100 miles per hour. As the system progresses westward into the eastern Caribbean Sea, more organised convection trailing Isaac is expected to affect Barbados, bringing moderate to heavy showers and occasional gusty winds from early Thursday morning and into Friday.
The hurricane will weaken as it moves over cooler water, and is expected to be downgraded from hurricane to tropical storm status before making the transition to post-tropical storm on Sunday.
All of the islands under watch were significantly impacted by Hurricanes Maria or Irma last September, with some of them still trying to rebuild. Satellite images show very little left as a recognizable tropical storm. "Near the coast, the surge will be accompanied by large and destructive waves", the NHC added.
Experts said residents in the Caribbean - including Puerto Rico, Hispaniola, Cuba, Jamaica and the Bahamas - and the United States mainland should stay aware of Isaac's path beyond the Lesser Antilles. "This rainfall may cause life-threatening flash floods".
As three powerful storms march one by one across the Atlantic Ocean toward the U.S. East Coast and the Caribbean, a fourth is getting ready to roll over the Hawaiian Islands.
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Fortunately for House, he says this storm should not be a devastating event for the beach town in terms of loss of life. Forecasters said " catastrophic " freshwater flooding was expected along waterways far from the coast of the Carolinas.
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Tropical Storm Issac was one of four weather systems rolling across the Atlantic Thursday, including the unsafe category 2 Hurricane Florence, which was packing winds of nearly 100mph as it headed towards the Carolinas on the east coast of the United States. "On the forecast track, the center of Florence will approach the coasts of North and SC later tonight, then move near or over the coast of southern North Carolina and northeastern SC in the hurricane warning area on Friday", the briefing said.
The poorly organized, 45-mph storm is not expected to strengthen but should maintain its tropical storm strength for the next few days.
Tropical storm warnings were issued for Martinique, Dominica, and Guadeloupe.
The government of the Netherlands has discontinued the Tropical Storm Watch for Saba and St. Eustatius. It should dissipate by early next week, the hurricane center said.