Hurricane Irma posing threat to parts of the Caribbean

Hurricane Irma is swirling in the Atlantic, posing a threat to parts of the Caribbean.

Irma has strengthened to a Category 3 hurricane, with winds nearing 115 mph, the National Hurricane Center said.

The storm is expected to remain a dangerous major hurricane through the upcoming week and could directly affect the British and U.S. Virgin Islands, Puerto Rico, Hispaniola, the Turks and Caicos, and the Bahamas.

The hurricane center says hurricane conditions are possible within the watch area by Tuesday night, with tropical storm conditions possible by late Tuesday.

Hurricane watches have been issued for the islands of Antigua, Barbuda, Anguilla, Montserrat, St. Kitts and Nevis. Additional hurricane or tropical storm watches may come as soon as Monday for the British and US Virgin Islands and Puerto Rico on Monday.

A hurricane watch, issued two days in advance of tropical storm force winds, means sustained winds of 74 mph or higher are possible.

On Sunday afternoon, Irma’s center was about 790 miles east of the Leeward Islands, a group of islands in the West Indies that start east of Puerto Rico. Tropical storm force winds from Irma would most likely begin in the Leeward Islands on Tuesday night, and the storm is expected to be near the northern Leeward Islands by late Tuesday.

Continental U.S. dangers remain to be seen

It’s unclear if the storm could affect the continental U.S. But a hurricane center forecaster stressed that the exact forecast track should not be the focus because strong winds and heavy rainfall can extend well away from the center.

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Hurricane force winds extend outward up to 35 miles from the center and those from tropical storms extend outward up to 140 miles.

It’s too soon to know the impact Irma could have on the continental United States, where no warnings or watches are currently in effect, the agency said.

“Regardless, everyone in hurricane-prone areas should ensure that they have their hurricane plan in place, as we are now near the peak of the season,” the hurricane center said.

Meteorologists outline possible risks

CNN meteorologist Taylor Ward also said it was too early to predict Irma’s threat to the United States.

“As for what we do know, the system will approach the northern Leeward Islands late Tuesday or early Wednesday, likely as a major hurricane of Category 3 or more. It’s still unclear if these islands will take a direct hit or just be brushed by the outer bands of the storm,” he said.

“Beyond the northern Leeward Islands, the storm could approach the Turks and Caicos and Bahamas by late week, but again nothing is certain for these regions.”

Forecast models generally showed Irma approaching the Bahamas before turning to the north or northwest, Ward said.

“How hard the storm turns and where this occurs will determine what portion of the US is the most at risk. It is also still entirely possible that the storm approaches the Bahamas and then turns sharp enough to stay out to sea. The storm is expected to be a major hurricane, so it would still bring high surf, erosion, and rip currents to much of the eastern seaboard, but staying offshore is obviously the best case scenario.”

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If Irma made landfall in the United States it would likely not be until late next weekend at the earliest, he said.

Irma was designated a tropical storm Wednesday morning, and by Thursday afternoon, it had strengthened, with winds of 115 mph.

Irma is a classic “Cape Verde hurricane,” a type of hurricane that forms in the far eastern Atlantic, near the Cape Verde Islands (now known as the Cabo Verde Islands), then tracks all the way across the Atlantic, CNN meteorologist Brandon Miller said.

Cape Verde storms frequently become some of the largest and most intense hurricanes. Examples are Hurricane Hugo, Hurricane Floyd, and Hurricane Ivan.