A Special Marine Warning (SMW) is a type of weather advisory issued by meteorological services to inform mariners about potentially hazardous conditions that may affect marine activities. These conditions can include severe weather phenomena such as thunderstorms, waterspouts, high winds, heavy seas, or other marine hazards that are imminent or occurring. The main purpose of an SMW is to alert boaters and vessels in the affected area so they can take appropriate precautions to ensure their safety.
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