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Meaning of special marine warning

spe'cial marine' warn"ing

Pronunciation: [key]
— Meteorol. Meteorol.
  1. a National Weather Service warning of high-wind conditions at sea that are expected to last for up to two hours, and generally result from convective storm systems, as thunderstorms or squall lines. Cf.(def. 3).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.