Science

Storm Helene wind warning issued

Storm Helene wind warning issued

Helene is now one of a glut of tropical storms in the Atlantic, with Florence sparking mass evacuations as it heads towards landfall in the USA states of North Carolina, South Carolina and Virginia.

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

On the forecast track, Isaac will move over the eastern and central Caribbean Sea during the next few days. This rainfall may cause risky flash flooding.

Tropical storm warnings were issued for Martinique, Dominica, and Guadeloupe.

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.

At 11 p.m., the center of the storm was 195 miles south-southeast of St. Croix.




Rainfall of 1 to 2 inches was expected to affect Puerto Rico and the United States Virgin Islands with isolated areas receiving up to 4 inches. Isaac was moving to the west at 21 miles per hour with maximum sustained winds of 45 miles per hour.

Given the lack of deep convection to sustain the cyclone, continual gradual weakening is expected. The meteorological service of Antigua and Barbuda has issued a Tropical Storm Watch for Antigua and Montserrat.

Another system in north-central Atlantic waters was upgraded to a subtropical storm, Joyce, Wednesday afternoon as it approached the Azores.

Wind gusts of up to 65mph are forecast with up to 80mph possible in more exposed areas.

Large waves lashing coastal regions also have the potential to harm by propelling "beach material" onto seafronts, the warning said.

Swells generated by Isaac are affecting portions of the Lesser Antilles. These swells are likely to cause life-threatening surf and rip current conditions.


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