All watches and warnings for Tropical Storm Isaac have ended

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Some fluctuation in wind speeds are expected, and weakening forecast Thursday, but it's still expected to be a fierce storm triggering risky flooding. Rainfall of 0.5 to 1.5 inches with isolated amounts to 3 inches are forecast across Puerto Rico and the southern United States Virgin Islands, with up to an inch anticipated across the remaining Windward and Leeward Islands.

Florence, however, continues to threaten the east coast as a fierce storm that could trigger flooding as far south as Georgia. The storm has 45 miles per hour sustained winds with higher-speed gusts.

The French government has issued a hurricane watch for Guadeloupe and Martinique; Barbados has done so for Dominica and officials in Antigua and Barbuda issued a tropical storm watch for Antigua and Montserrat, the NHC said. Isaac was moving to the west at 21 miles per hour with maximum sustained winds of 45 miles per hour.

Rainfall amounts of 2 to 4 inches with isolated amounts up to 6 inches over elevated terrain are forecast across Martinique and Guadeloupe.

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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.

Swells generated by Isaac will begin to affect portions of the Lesser Antilles this afternoon.

Although Florence was downgraded from Category 4 status, it is still considered an extremely risky storm with maximum sustained winds near 125 miles per hour. No coastal watches or warnings are in effect, and the NHC forecast track shows the storm heading west towards Central America. These swells are likely to cause life-threatening surf and rip current conditions. Earlier forecasts showed that the storm was slated to directly hit around North and SC.

There were two other systems in development Wednesday as well.

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