Hurricane Irene was a large and very destructive hurricane which affected much of the Caribbean and East Coast of the United States during the 2011 Atlantic hurricane season. The ninth named storm, first hurricane, and first major hurricane of the 2011 hurricane season, Irene originated from a well-defined Atlantic tropical wave that began showing signs of organization east of the Lesser Antilles. Due to development of atmospheric convection and a closed center of circulation, the system was designated as Tropical Storm Irene on August 20, 2011. After intensifying, Irene made landfall in St. Croix as a strong tropical storm later that day. Early on August 21, the storm made a second landfall in Puerto Rico. While crossing the island, Irene strengthened into a Category 1 hurricane. The storm paralleled offshore of Hispaniola, continued to slowly intensify in the process. Shortly before making four landfalls in the Bahamas, Irene peaked as a 120 mph (195 km/h) Category 3 hurricane.

Thereafter, the storm slowly leveled-off in intensity as it struck the Bahama and then curved northward after passing east of Grand Bahama. Continuing to weaken, Irene was downgraded to a Category 1 hurricane before making landfall on the Outer Banks of North Carolina on August 27, becoming the first hurricane to make landfall in the United States since Hurricane Ike in 2008. Early on the following day, the storm re-emerged into the Atlantic from southeastern Virginia. Although Irene remained a hurricane over land, it weakened to a tropical storm while making yet another landfall in southeastern New Jersey on August 28. A few hours later, Irene made its ninth and final landfall in Brooklyn, New York City. Early on August 29, Irene transitioned into an extratropical cyclone near the Vermont/New Hampshire border, after remaining inland as a tropical cyclone for less than 12 hours.

Throughout its path, Irene caused widespread destruction and at least 56 deaths; monetary losses in the Caribbean were estimated to be as high as US$3.1 billion. Damage estimates throughout the United States are estimated near $15.6 billion, for a total of at least $18.7 billion along its path. It was the seventh costliest hurricane in United States history, only behind Hurricane Andrew of 1992, hurricanes Charley and Ivan of 2004, hurricanes Wilma and Katrina of 2005, and Hurricane Ike of 2008.

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