Tropical storm warnings were in effect for Martinique, Dominica and Guadeloupe, while watches were in effect for Montserrat, St. Kitts and Nevis, Antigua, and Saba and St. Eustatius. This general motion is expected to continue for the next few days.
The NHC is estimating that as many as 20 inches of rain could fall in some places along the southern North Carolina coast while bringing in excess of 10 inches of rain in parts of SC.
They also said that Isaac is expected to produce total rainfall accumulations of three to five inches with isolated amounts near ten inches across the Leeward Islands late this week, with one to two inches anticipated across the Windward Islands.
Isaac is moving toward the west near 17 miles per hour.
Some fluctuation in wind speeds are expected, and weakening forecast Thursday, but it's still expected to be a fierce storm triggering unsafe flooding.
Isaac weakened into a tropical storm Monday and by Tuesday recorded maximum sustained winds of 70 miles per hour.
Hurricane Helene is forecast to weaken over the eastern Atlantic Ocean, and interests in the Azores islands should monitor the storm's progress. This rainfall may cause unsafe flash flooding.
The yellow warning is in place from 6pm on Monday until midday on Tuesday, with the impact limited to the south east of the province.
Surf swells from Isaac could be life-threatening and coastal flooding is a risk in the Lesser Antilles.
Isaac was a hurricane Sunday night but downgraded when maximum sustained winds fell below 74 miles per hour.
After forecast models showed steering currents collapsing as the storm nears the Carolina coast Tuesday, forecasters shifted the track slightly south. While early on Wednesday the odds of it forming dropped, by afternoon forecasters had again increased the chance to 70 percent over two days.