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High windsHurricanes are measured by their wind velocity, according to the Saffire-Simpson Hurricance Scale. A Category 1 Hurricane has winds of at least 75 mph, while a Category 5 Hurricane has winds of 156 mph and up.
Before it headed toward Louisiana, Katrina paid a wet, windy visit to Florida. One person trying to drive through the storm in Fort Lauderdale called it "easily the most harrowing yet exciting 10 minutes of my life."
One of the most deadly effects of a hurricane is inland flooding. More than half the deaths from hurricanes were attributed to floods. The intense rains from Hurricane Floyd in 1999 resulted in 50 drownings. Pictured is the aftermath of Hurricane Allison, which hit the Houston area in 2001.
More than half of hurricanes that hit land produce at least one tornado. There's no way to predict which storms will spawn tornadoes or where they will touch down, but new Doppler radar systems can give some warning. One clue: If you see hail or lighting, you're probably safe.