The most expensive and deadly type of climate disaster, tropical storms occur mostly in the Eastern Shore and states along the Gulf. Harvey (in gray) is expected to be the second most expensive hurricane in U.S. history. At least a dozen deaths have been reported, and the number is expected to rise. Katrina initially made landfall in Florida as a Category 1 hurricane in 2005, evolving to a Category 3 as it moved through the Gulf Coast and caused devastating effects in New Orleans. In 2012, Hurricane Sandy rocked New York City and much of the Northeast as it merged with a developing Nor'easter, causing major network breakdowns and the New York Stock Exchange to close for two business days.