83-Foot Wave Recorded By Satellite Monitoring Hurricane Florence

Federico Mansilla
Setiembre 15, 2018

But the weather system will have weakened by the time it hits the western side of the United Kingdom, becoming more of a storm, the Met Office said.

Isaac weakened into a tropical storm Monday and by Tuesday recorded maximum sustained winds of 70 miles per hour. Gradual weakening is forecast during the next few days. When Isaac reaches the west-central Caribbean Sea in a couple of days, the shear may relax somewhat and the global models suggest that there will be an increase in mid-level moisture.

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. It's expected be south of Jamaica by Sunday morning.

Forecasters say Isaac is expected to produce total rainfall accumulations of 3 to 5 inches with isolated amounts near 10 inches across the southern Leeward Islands late this week, with 1 to 2 inches anticipated across portions of the Windward Islands. Near the coast, the surge will be accompanied by large waves.

Isaac a little weaker and continues to lose organisation as it moves westward. This rainfall may cause unsafe flash flooding, N.H.C. said.

Hurricane Helene is forecast to weaken over the eastern Atlantic Ocean, and interests in the Azores islands should monitor the storm's progress.

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Helene is one of three major storms now swirling in the Atlantic. Hurricane watches were in effect on those islands.

Some coastal flooding is possible in areas of onshore winds.

A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area within 36 hours. "Persons located within these areas should take all necessary actions to protect life and property from rising water and the potential for other unsafe conditions", the hurricane center briefing said.

"Hurricane Joyce is also in the Atlantic so we need to see how those two systems are going to move around each other because that could have an impact".

Still closer to Africa than North America, Hurricane Helene is predicted to head northeast in the Atlantic, then veer toward Europe, the center said.

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