How Florence Became A Category 4 Storm | Mach | NBC News

Hurricane Florence is set to slam into the East Coast this week. The Carolinas are expected to be hardest hit by the storm, which has now worsened into a Category 4 storm with 130-mph winds. What turns a tropical storm into a potentially deadly hurricane? And what causes a hurricane to gain strength?
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How Florence Became A Category 4 Storm | Mach | NBC News

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