Scotland's weather: Storm Helene 80mph winds warning

Hurricanes Florence Isaac and Helene moving through the Atlantic

Hurricanes Florence Isaac and Helene moving through the Atlantic

The NHC at 11 a.m. on September 12 has issued warnings for Tropical Storm Isaac, which is still moving west about 420 miles east of the island of Martinique.

The government of France has issued a Hurricane Watch for Guadeloupe and Martinique.

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.

Helene is one of several major storms in the Atlantic at the moment, with Florence sparking mass evacuations as it heads towards landfall on the east coast of the US.

Isaac is moving west at 21 miles per hour.

Isaac is expected to move near or over the central Lesser Antilles on Thursday and move into the eastern Carribbean Sea on Thursday night. 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.

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

Gradual weakening is forecast during the next 72 hours.

However, it is not expected to bring the severe weather seen during Storm Ophelia last October, which caused widespread damage and left three people dead.

In contrast, no coastal watches or warnings were in effect for Helene, but residents of the Azores were encouraged to monitor the storm.

The storm is likely to die out by Wednesday, the forecaster said.

Isaac was a hurricane Sunday night but downgraded when maximum sustained winds fell below 74 miles per hour.

In addition to hurricane-force winds, Florence was forecast to produce large swells and life-threatening rip currents from the U.S. East Coast to Bermuda.

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