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10 things you didn't know about hurricanes

Oct. 20, 2010, 1:15 p.m.
flooded New Orleans after Hurricane Katrina

Photo: ZUMA Press

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Most expensive hurricane

In 2005, Hurricane Katrina became the most expensive hurricane in history, costing an estimated $45 billion. Prior to that, Hurricane Andrew, which caused $23.7 billion in damages, had been the most expensive natural disaster in U.S. history.

Hurricane Katrina first made landfall as a Category 1 storm in Florida on Aug. 25, 2005, but when it hit Louisiana’s coast four days later, it was a Category 4 hurricane. The storm breached the levees protecting New Orleans from Lake Pontchartrain and the Mississippi River, flooding the city. More than 1 million people were displaced by Hurricane Katrina, and more than 1,300 people died.