tropical cyclone National Ocean Service 75 mph What is a hurricane? NOAA video (1 min) NOAA Hurricane Facts Hurricanes National Oceanic and Atmosphere Administration (NOAA) tropical cyclone Hurricanes 12 hurricanes National Ocean Service: What is a Hurricane? "What is a hurricane" 74 miles Hurricane National Oceanic A A (NOAA) tropical depression National Ocean Service -National Oceanic and Atmospheric Administration 飓风 type of tropical cyclone National Oceanic and Atmospheric Administration NOAA tropical cyclones Hurricane website noaa.gov hurricane http://oceanservice.noaa.gov/facts/hurricane.html website NOAA What Is a Hurricane? type of tropical cyclone NOAA Hurricane Facts National Ocean Service national ocean service USA National Ocean Service http://oceanservice.noaa.gov/facts/hurricane.html considered National Ocean Service: What is a hurricane?