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Hurricane Sandy is a massive, late-season tropical cyclone that has affected Jamaica, Cuba, the Bahamas, Haiti, the Dominican Republic, and the southeastern United States, and is currently affecting the East Coast of the United States and Eastern Canada. Sandy developed from an elongated tropical wave in the western Caribbean Sea on October 22, 2012. It became a tropical depression, quickly strengthened, and was upgraded to a tropical storm six hours later. On October 24, Sandy was upgraded to a hurricane, shortly before making landfall in Jamaica. On October 28, Sandy surpassed 2010's Hurricane Igor to become the largest hurricane in Atlantic history, with a maximum gale-force wind diameter of 930 mi (1500 km).