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What is a "Potential Tropical Cyclone"

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A new weather term entered the lexicon this week when the National Hurricane Center (NHC) issued its first-ever Potential Tropical Cyclone (PTC) advisory Sunday afternoon, highlighting the threat of a strong tropical wave in the central Atlantic that is likely to affect the Windward Islands as a tropical storm. Another system in the northwest Caribbean remains on track to move into the Gulf of Mexico, where it could affect areas from Texas to Florida as a tropical storm later this week.

The new Potential Tropical Cyclone advisories will provide more detailed guidance on systems that are not yet at depression strength but that have a chance of intensifying and bringing tropical storm or hurricane conditions to land areas within 48 hours. In their announcement of this and other service changes for 2017, NHC said: “Under previous longstanding NWS policy, it has not been permitted to issue a hurricane or tropical storm watch or warning until after a tropical cyclone had formed.  Advances…