The distance from the center of a tropical cyclone to the location of the cyclone's maximum winds. In well-developed hurricanes, the radius of maximum winds is generally found at the inner edge of the eyewall
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NOAA/National Weather Service, National Centers for Environmental Prediction, National Hurricane Center NHC, Glossary of NHC Terms, Miami, Florida, USA 2014. http://www.nhc.noaa.gov/aboutgloss.shtml, (ND/ Hurr Sci - Amer) {916}