Sandy developed from a tropical wave in the western Caribbean Sea on October 22, quickly strengthened and was upgraded to Tropical Storm Sandy six hours later. Sandy moved slowly northward toward the Greater Antilles and gradually intensified. On October 24, Sandy became a hurricane, made landfall near Kingston, Jamaica, a few hours later, re-emerged into the Caribbean Sea and strengthened into a Category 2 hurricane. On October 25, Sandy hit Cuba, then weakened to a Category 1 hurricane. Early on October 26, Sandy moved through the Bahamas.[7] On October 27, Sandy briefly weakened to a tropical storm and then restrengthened to a Category 1 hurricane. Early on October 29, Sandy curved north-northwest and then[8] moved ashore near Atlantic City, New Jersey as a "post-tropical cyclone" with hurricane-force winds.[9][10] Shortly after, media outlets were calling the storm "Superstorm Sandy".
In Jamaica, winds left 70% of residents without electricity, blew roofs off buildings, killed one, and caused about $55.23 million (2012 USD) in damage. In Haiti, Sandy's outer bands brought flooding that killed at least