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Isaac strengthens to likely Cat 2 hurricane

The Florida Keys know what to expect from a big storm, and they're getting ready. Tourists have been warned to get out of town.

By NBC News staff and wire reports

Tropical Storm Isaac is likely to be a hurricane when it hits the Florida Keys on Sunday, forecasters said, and is set strengthen to a Category 2 - capable of sustained winds of 96-100 mph -?as it heads north toward the Gulf Coast later.

Isaac drew new strength early Sunday during a warm-water crossing of the Florida Straits after it downed trees and power lines in Cuba and left at least seven dead earlier in Haiti.


In Key West, emergency management and law enforcement officials ordered visitors and residents to remain indoors when the system moves through the island chain later.

The Weather Channel's Bryan Norcross tracks Tropical Storm Isaac's movement and predictions about where it is headed.

Officials early Sunday said it was too late to leave, citing deteriorating conditions that will soon make driving too dangerous.

"You've chosen to remain in the Keys during this storm and the only safe place for you to be is indoors," said Monroe County Emergency Management Director Irene Toner. "Stay off roads and don't go outside."

Follow Isaac's path with our storm tracker
Live updates and analysis from weather.com

Locals followed time-worn storm preparedness rituals while awaiting the storm after Isaac swamped the Caribbean and shuffled plans for the Republican National Convention in Tampa.

Forecasters said the storm was expected to reach the archipelago later Sunday or Sunday night at or near hurricane strength.

At both Fort Lauderdale and Miami International airports, scores of inbound and outbound flights were canceled, NBC 6 Miami?s Diana Gonzalez reported.

In Tampa, the Sunday night performance of Lynyrd Skynyrd at the American Action Network Pavilion at Liberty Plaza was cancelled for the safety of the audience. ?

"Currently Isaac is a tropical storm that's expected to become a hurricane as it reaches Key West ... then it will move into the Gulf of Mexico and is expected to strengthen" further, said Meteorologist Jessica Schauer with the U.S. National Hurricane Center in Miami.

"Our forecast is that as the system moves northward it is forecast to strengthen to a Category 2," she said, adding an ultimate landfall is possible on the northern Gulf Coast late Tuesday night or early Wednesday morning.

"Definitely the northern Gulf Coast should be preparing for a hurricane right now," she added, speaking with The Associated Press by telephone.

Schauer cautioned that Isaac also poses a threat of destructive storm surges, though she noted forecasts extending out as far as Tuesday or Wednesday are subject to greater uncertainty.

She said a wide swath of the Gulf Coast, including the thousands of people gathering for the Republican National Convention in Tampa set to begin Monday, should remain alert to the storm's progress.

Hurricane impending, Republicans cancel first day of convention

Forecast models show Isaac likely won't hit Tampa head-on, but it could have lashed the city with rain and strong winds just as the convention was ramping up. A tropical storm warning was extended north of Tampa Bay.

Convention officials said they would convene the event briefly on Monday, then immediately recess until Tuesday afternoon, when the storm should have passed. Florida Gov. Rick Scott, a Republican, declared a state of emergency and canceled his plans to attend convention events on Sunday and Monday.

As of 5 a.m. EDT, the storm was centered about 205 miles (330 kms) east-southeast of Key West, according to the U.S. National Hurricane Center in Miami. Isaac had strengthened in recent hours, with maximum sustained winds of 65 mph (100 kph) while crossing open water.

How do you salvage vacation plans when a hurricane strikes? NBC's Chris Clackum reports.

Forecasters said a hurricane hunter plane found the top sustained winds had increased from about 60 mph (95 kph) just hours earlier.

Isaac was then forecast to move over the southeast Gulf of Mexico on Monday. It was moving to the northwest toward the Keys at 18 mph (30 kph). Tropical storm-force winds extended outward up to 205 miles (335 kph) from the center, giving Isaac a broad sweep as it passed.

A hurricane warning was in effect for the Keys, including the Dry Tortugas and for the west coast of Florida from Bonita Beach south to Ocean Reef, among some other areas, authorities said.

Meanwhile authorities said a new hurricane watch has been issued from the mouth of the Mississippi River -- not including the New Orleans metro area -- eastward to Indian Pass, Fla.

Weather Channel slideshow: The Wrath of Isaac

From Key West, a steady line of cars moved north along the Overseas Highway, the only road linking the Florida Keys, while residents boarded up windows, laid down sandbags and shuttered businesses ahead of the approaching storm. Even Duval Street, Key West's storied main drag, was subdued for a weekend, though not enough to stop music from playing or drinks from being poured.

"We'll just catch every place that's open," said Ted Lamarche, a 48-year-old pizzeria owner visiting Key West to celebrate his anniversary with his wife, Deanna. They walked along on Duval Street, where a smattering of people still wandered even as many storefronts were boarded up and tourists sported ponchos and yellow slickers.

Isaac has already left a trail of suffering across the Caribbean. ? The storm's center made landfall Saturday near the far-eastern tip of Cuba, downing trees and power lines. In the picturesque city of Baracoa, the storm surge flooded the seaside Malecon and a block inland, destroying two homes.

At least seven were killed in Haiti,?Marie Alta Jean-Baptiste, Director of Haiti's Civil Protection Office told NBC News?The dead included?a 10-year-old girl who had a wall fall on her.

The government also reported "considerable damage" to agriculture and homes. Nearly 8,000 people were evacuated from their houses or quake shelters and more than 4,000 were taken to temporary shelters.

The Associated Press contributed to this report.

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Source: http://usnews.nbcnews.com/_news/2012/08/26/13487030-isaac-strengthens-set-to-hit-gulf-coast-as-category-2-hurricane?lite

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