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  • A man gestures as he walks ...

    Ricardo Arduengo, AFP/Getty Images

    A man gestures as he walks through a debris covered road as Hurricane Maria hits Puerto Rico in Fajardo, on Sept. 20, 2017. Maria made landfall on Puerto Rico, pummeling the US territory after already killing at least two people on its passage through the Caribbean. The US National Hurricane Center warned of "large and destructive waves" as Maria came ashore near Yabucoa on the southeast coast.

  • Residents of San Juan, Puerto Rico, ...

    Hector Retamal, AFP/Getty Images

    Residents of San Juan, Puerto Rico, deal with damages to their homes on Sept. 20, 2017, as Hurricane Maria batters the island. Maria slammed into Puerto Rico on Wednesday, cutting power on most of the US territory as terrified residents hunkered down in the face of the island's worst storm in living memory. After leaving a deadly trail of destruction on a string of smaller Caribbean islands, Maria made landfall on Puerto Rico's southeast coast around daybreak, packing winds of around 150mph (240kph).

  • Rain and wind hit a parking ...

    Hector Retamal, AFP/Getty Images

    Rain and wind hit a parking lot at Roberto Clemente Coliseum in San Juan, Puerto Rico, on September 20, 2017, during the passage of the Hurricane Maria. Maria made landfall on Puerto Rico on Wednesday, pummeling the US territory after already killing at least two people on its passage through the Caribbean. The US National Hurricane Center warned of "large and destructive waves" as Maria came ashore near Yabucoa on the southeast coast.

  • People taking shelter at Fajardo's City ...

    Ricardo Arduengo, AFP/Getty Images

    People taking shelter at Fajardo's City Hall watch as Hurricane Maria hits Puerto Rico on Sept. 20, 2017. Maria made landfall on Puerto Rico on Wednesday, pummeling the US territory after already killing at least two people on its passage through the Caribbean. The US National Hurricane Center warned of "large and destructive waves" as Maria came ashore near Yabucoa on the southeast coast.

  • This satellite image obtained from the ...

    NOAA via AFP/Getty Images

    This satellite image obtained from the National Oceanic and Atmospheric Administration (NOAA) shows Hurricane Maria at 1200UTC on Sept. 20, 2017. Maria made landfall on Puerto Rico on Wednesday, pummeling the US territory after already killing at least two people on its passage through the Caribbean. The US National Hurricane Center warned of "large and destructive waves" as Maria came ashore near Yabucoa on the southeast coast.

  • A woman covers herself with a ...

    Tatiana Fernandez, The Associated Press

    A woman covers herself with a plastic bag as she makes her way to work as Hurricane Maria approaches the coast of Bavaro, Dominican Republic, Wednesday, Sept. 20, 2017.

  • Men wade through a flooded Alemania ...

    Tatiana Fernandez, The Associated Press

    Men wade through a flooded Alemania Avenue as Hurricane Maria reaches the coast of Bavaro, Dominican Republic, Wednesday, Sept. 20, 2017.

  • A search and rescue crew member ...

    Ricardo Arduengo, AFP/Getty Images

    A search and rescue crew member removes a tree branch from a flooded road as Hurricane Maria hits Puerto Rico in Fajardo, on Sept. 20, 2017. Maria made landfall on Puerto Rico, pummeling the US territory after already killing at least two people on its passage through the Caribbean. The US National Hurricane Center warned of "large and destructive waves" as Maria came ashore near Yabucoa on the southeast coast.

  • Residents of San Juan, Puerto Rico, ...

    Hector Retamal, AFP/Getty Images

    Residents of San Juan, Puerto Rico, deal with damages to their homes on Sept. 20, 2017, as Hurricane Maria batters the island. Maria slammed into Puerto Rico on Wednesday, cutting power on most of the US territory as terrified residents hunkered down in the face of the island's worst storm in living memory. After leaving a deadly trail of destruction on a string of smaller Caribbean islands, Maria made landfall on Puerto Rico's southeast coast around daybreak, packing winds of around 150mph (240kph).

  • Rescue personnel from the Emergency Management ...

    Carlos Giusti, The Associated Press

    Rescue personnel from the Emergency Management Agency make preparations to rescue about 19 municipal police officers that were stranded at their flooded station during the impact of Maria, a Category 5 hurricane that hit the eastern region of the island, in Humacao, Puerto Rico, Wednesday, Sept. 20, 2017.

  • A woman is transported to a ...

    Ricardo Arduengo, AFP/Getty Images

    A woman is transported to a shelter by search and rescue crew members after being rescued from her flooded home as Hurricane Maria hits Puerto Rico in Fajardo, on Sept. 20, 2017. Maria made landfall on Puerto Rico, pummeling the US territory after already killing at least two people on its passage through the Caribbean. The US National Hurricane Center warned of "large and destructive waves" as Maria came ashore near Yabucoa on the southeast coast.

  • Residents of San Juan, Puerto Rico, ...

    Hector Retamal, AFP/Getty Images

    Residents of San Juan, Puerto Rico, deal with damages to their homes on Sept. 20, 2017, as Hurricane Maria batters the island. Maria slammed into Puerto Rico on Wednesday, cutting power on most of the US territory as terrified residents hunkered down in the face of the island's worst storm in living memory. After leaving a deadly trail of destruction on a string of smaller Caribbean islands, Maria made landfall on Puerto Rico's southeast coast around daybreak, packing winds of around 150mph (240kph).

  • Destruction caused by Hurricane Maria close ...

    Jose Romero And Hector Retamaljose Romero,hector Retamal, AFP/Getty Images

    Destruction caused by Hurricane Maria close to Roberto Clemente Coliseum in San Juan, Puerto Rico, on Sept. 20, 2017. Maria slammed into Puerto Rico on Wednesday, cutting power on most of the US territory as terrified residents hunkered down in the face of the island's worst storm in living memory. After leaving a deadly trail of destruction on a string of smaller Caribbean islands, Maria made landfall on Puerto Rico's southeast coast around daybreak, packing winds of around 150mph (240kph).

  • TOPSHOT - Librada is seen at ...

    Hector Retamal, AFP/Getty Images

    Librada is seen at the Roberto Clemente Coliseum refuge in San Juan, Puerto Rico, on Sept. 19, 2017, prior the arrival of Hurricane Maria. She left voluntarily of her house to take refuge. Maria headed towards the Virgin Islands and Puerto Rico after battering the eastern Caribbean island of Dominica, with the US National Hurricane Center warning of a "potentially catastrophic" impact.

  • A man clears debris from a ...

    Lionel Chamoiseau, AFP/Getty Images

    A man clears debris from a street in Saint-Pierre, on the French Caribbean island of Martinique, after it was hit by Hurricane Maria, on Sept. 19, 2017. Martinique suffered power outages but avoided major damage.

  • Felled trees cover the roads in ...

    Alex Wroblewski, Getty Images

    Felled trees cover the roads in the Miramar neighborhood after Hurricane Maria made landfall on Sept. 20, 2017 in San Juan, Puerto Rico. Thousands of people have sought refuge in shelters, and electricity and phone lines have been severely effected.

  • Workers pick up tables and board ...

    Tatiana Fernandez, The Associated Press

    Workers pick up tables and board up windows at a restaurant, before the arrival of Hurricane Maria in Bavaro, Dominican Republic, Wednesday, Sept. 20, 2017.

  • Residents cover windows as they prepare for a direct hit from Hurricane Maria on September 19, 2017 in San Juan, Puerto Rico.

    Alex Wroblewski, Getty Images

    Residents cover windows as they prepare for a direct hit from Hurricane Maria on September 19, 2017 in San Juan, Puerto Rico. Puerto Rico Gov. Ricardo Rossello is saying Maria could be the "most catastrophic hurricane to hit" the U.S. territory in a century.

  • The La Perla neighborhood in Old ...

    Alex Wroblewski, Getty Images

    The La Perla neighborhood in Old San Juan as residents prepare for a direct hit from Hurricane Maria on Sept. 19, 2017 in San Juan, Puerto Rico. Puerto Rico Gov. Ricardo Rossello is saying Maria could be the "most catastrophic hurricane to hit" the U.S. territory in a century.

  • TOPSHOT - A resident stands at ...

    Lionel Chamoiseau, AFP/Getty Images

    A resident stands at her doorstep as she looks at strong waves in Saint-Pierre, on the French Caribbean island of Martinique, after it was hit by Hurricane Maria, on Sept. 19, 2017. Martinique suffered power outages but avoided major damage.

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For the fourth time in a month, a hurricane is threatening the United States.

Hurricane Maria could prompt storm watches along North Carolina’s Outer Banks as it rolls north after killing at least 10 people and knocking out power to the entire U.S. Commonwealth of Puerto Rico. The storm, which struck the island as a Category 4 major hurricane, threatens to at least graze the U.S. East Coast later this week.

“It is likely that some direct impacts will occur along portions of the coast next week,” wrote Jack Beven, a senior hurricane specialist at the National Hurricane Center in Miami. “Swells from Maria are increasing along the coast of the southeastern United States and are expected to reach the Mid-Atlantic coast (Sun)day.”

Across the Caribbean and the Gulf of Mexico, tropical storms have killed at least 100. Ten people died on Puerto Rico, according to the Associated Press.

A record three Category 4 hurricanes have hit the U.S. since Harvey came ashore in Texas on Aug. 25, causing an estimated $170 billion damage, according to Enki Research in Savannah, Georgia. When damage across the Caribbean is considered, the current Atlantic season could cost $300 billion, said Joel Myers, founder, president and chairman of AccuWeather Inc. in State College, Pennsylvania.

Maria’s economic cost to Puerto Rico could increase if the islands sees an exodus of residents fearful that water and power could be out for months, said Chuck Watson, of Enki Research.

“The people most able to leave — professionals, middle class — may well chose to leave,” Watson said Sunday. “Those people are vital to restore normalcy, so a recovery death spiral of sorts starts.”

If that happens, Maria’s impacts on Puerto Rico could easily reach $60 billion to $70 billion, Watson said.

The storms had deep impacts on markets as well. Harvey temporarily shut about 25 percent of oil and natural gas production in the Gulf of Mexico and 10 percent of U.S. refining capacity. Hurricane Irma subjected Florida’s citrus groves to fruit losses that have completely wiped out some farmers.

Maria was about 530 miles (853 kilometers) south-southeast of Cape Hatteras, North Carolina, Sunday morning, with top wilds of 110 miles per hour, making it a Category 2. The storm has been losing power since it struck Dominica and Puerto Rico last week.

Along with Maria, Hurricane Lee, a Category 1 storm on the five-step Saffir-Simpson scale, is churning in the central Atlantic and isn’t a threat to land, the hurricane center said. In all, six storms have become strong enough to earn names and all have gone on to become hurricanes. Four became major systems, Category 3 or stronger, including Harvey, Irma and Maria.

While the past month has been devastating, the 2017 season doesn’t end until Nov. 30 and warm ocean temperatures suggest there are still more storms to come, said Phil Klotzbach, lead author of the Colorado State University seasonal hurricane forecast.

The ocean temperatures “match up well with what is typically observed when the end of the Atlantic hurricane season is active,” Klotzbach said in a tweet last week.

–With assistance from Jonathan Levin and Naureen S. Malik