Hurricane Dorian is now expected to become a Category 4 storm, with winds reaching 130 miles per hour within 72 hours as it barrels toward Florida’s east coast, aiming to become the first major hurricane to hit that area in 15 years.

The hurricane’s center was located about 220 miles (354 kilometers) north-northwest of San Juan, Puerto Rico at 11 a.m. New York time, moving northwest with sustained winds of about 85 miles per hour, according to the U.S. National Hurricane Center. Dorian is expected to gain strength as it moves over the water, with landfall expected over the Labor Day weekend.

While it’s too early to say where Dorian will hit, concern is growing among residents, vacationers and farmers. On its current path toward the central coast, it could impact counties with average insured values of $53 billion, according to Bloomberg Intelligence, while Chuck Watson, a disaster modeler with Enki Research, sees losses in the $10 billion range. About 60% of the main orange-growing region could eventually be affected.

“There is an increasing likelihood of life-threatening storm surge along portions of the Florida east coast late this weekend or early next week, although it is too soon to determine where the highest storm surge will occur,” according to the Hurricane Center update.

Florida Governor Ron DeSantis declared a state of emergency on Wednesday, and President Donald Trump urged residents in a tweet on Thursday to follow state and federal instructions.

“It is not out of the question that at landfall it is a Category 4,” which would carry winds of 130 mph to 156 mph, said Rob Miller, a meteorologist with AccuWeather Inc. in State College, Pennsylvania. He said it remains uncertain where landfall will occur.

Dorian is somewhat compact, which could keep wind damage confined, Miller said. However, the storm is expected to drop heavy rain over a wide area raising the flood risk. This would be made worse, he said, if the storm slows down.

The northwest Bahamas and coastal sections of the southeast U.S. are expected to see 4 inches to 8 inches of rain this weekend and into early next week. Isolated rainfall accumulations of 12 inches are also expected, the hurricane center reported, adding that the rainfall may cause life-threatening flash floods.

While Puerto Rico’s east end saw heavy rain from the storm’s outer bands, the main part of the island remained largely unaffected, easing concern Dorian might further devastate an island still recovering from Hurricane Maria’s 155 mph winds in 2017.

The last major hurricane to make landfall along the central coast of Florida carrying winds of 111 mph or more was Jeanne in 2004, said Phil Klotzbach, a hurricane researcher with Colorado State University.

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