An announcement that sustained winds of 34 to 63 knots (39 to 73 mph or 63 to 118 km/hr) are possiblewithin the specified area within 48 hours in association with a tropical, subtropical, or post-tropical cyclone
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}