Hurricane Helene: All you need to know about storm

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The National Hurricane Center (N.H.C.) in its 5:00 p.m. advisory said all tropical storm watches and warnings for Isaac have been discontinued, news that will be welcomed by interests in the Caribbean.

The storm is located about 1,350 miles south-southwest of the Azores, and it is moving north-northwest at 14 mph.

Meanwhile in the Pacific, Tropical Storm Olivia was close to Hawaii, where tropical storm warnings and watches are in effect, according to the Pacific Hurricane Center. The storm, which just days earlier had been a hurricane, weakened significantly as it approached the the Lesser Antilles and passed with little notice in the USVI, stirring some winds and bringing some hit-or-miss showers to the territory but little else.

At 8 a.m. the centre of Tropical Storm Isaac was located near latitude 14.4 North, longitude 54.1 West. Isaac is moving toward the west near 15 miles per hour (24 km/h), and this general motion is expected to continue through the weekend.

Given its expected slow speed once it rolls ashore, they warned the heavy rain and storm could spread across a wide area.

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.

Strongest winds are expected to spread from southern Ireland and the west of Cornwall and Wales, moving into north-western England, western Scotland and then northern Scotland.

Joyce could become a tropical storm within the next day or so.

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It's not clear if the storm is expected to strengthen back into a hurricane after it hits the eastern Caribbean.

Hurricane Florence has slowed as it approaches Wilmington, now marching at 5 miles per hour as it continues to aim its center at Wilmington, according to a 5 p.m. briefing by the National Hurricane Center.

Duke Energy says damage from Hurricane Florence could cut off electricity to three-quarters of its 4 million customers in the Carolinas, and the outages could last for weeks.

After forecast models showed steering currents collapsing as the storm nears the Carolina coast Tuesday, forecasters shifted the track slightly south. A Tropical Storm Watch means that tropical storm conditions are possible within the watch area. Current estimates have Isaac passing nearly 150 miles south of St. Croix early Friday morning.

Rain projections also increased, with some locations along the North Carolina coast now expected to get up to 40 inches.

Tropical Storm Watches were also discontinued for St. Maarten, St. Martin, Saba and Eustatius.

A system in the central Gulf of Mexico was a little less certain.

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