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HURRICANE FLORENCE | Evacuation for Hatteras; storm now Category 4

Originally published September 10, 2018 at 9:30 a.m., updated September 10, 2018 at 1:27 p.m.

RALEIGH, N.C. (AP) — Florence rapidly strengthened into a potentially catastrophic Category 4 hurricane on Monday as it closed in on North and South Carolina, carrying winds and water that could wreak havoc over a wide stretch of the eastern United States later this week.

The first effects of what forecasters are already calling a large and extremely dangerous hurricane were already being seen on barrier islands Monday as dangerous rip currents and seawater flowed over the state highway. People were told to prepare to evacuate communities up and down a stretch of coastline already identified as particularly vulnerable to rising sea levels due to climate change.

For many, the challenge could be finding a safe refuge: If Florence slows to a crawl just off the coast, it could carry torrential rains up into the Appalachian mountains, causing flash floods, mudslides and other dangerous weather across a wide area.

National Hurricane Center Director Ken Graham warned that Florence was forecast to slow down significantly and linger over the Carolinas once it reaches shore, dropping heavy rainfall as far as West Virginia. People living well inland should prepare to lose power and anticipate flooding and other hazards, he warned.

“It’s not just the coast,” Graham said. “When you stall a system like this and it moves real slow, some of that rainfall can extend well away from the center.”

A warm ocean is the fuel that powers hurricanes, and Florence will be moving over waters where temperatures are peaking near 85 degrees, hurricane specialist Eric Blake wrote. And with little wind shear to pull the storm apart, Florence’s hurricane wind field was expected to expand over the coming days, increasing its storm surge and inland wind threats along with life-threatening freshwater flooding.

By noon EDT on Monday, Florence had top sustained winds of 130 mph. It was centered about 1,230 miles east-southeast of Cape Fear, North Carolina, and moving west at 13 mph. Its center will move between Bermuda and the Bahamas Tuesday and Wednesday, and approach the coast of South Carolina or North Carolina on Thursday, the National Hurricane Center said.

Hurricane Isaac, meanwhile, was expected to lose strength as it reaches the Caribbean, and Helene, much farther out to sea, may veer northward into the open Atlantic as the 2018 hurricane season reaches its peak.