A term used in an advisory to indicate that a vector drawn from the preceding advisory position to the latest known position is not necessarily a reasonable representation of the cyclone's movement
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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}