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Weather & Water

Special Marine Warning

Technical visualThunderstorm over water
Thunderstorm over waterA boat lies ahead of an approaching thunderstorm cell, lightning, and a bounded warning area.APPROACHING CELLVESSEL
Thunderstorm over waterA boat lies ahead of an approaching thunderstorm cell, lightning, and a bounded warning area.121APPROACHING CELL2VESSEL
Treat thunderstorm hazards as a combined wind, wave, visibility and lightning problem; use official warnings and current observations.

A short-duration warning for hazardous marine weather, including events such as:

strong convective winds

waterspouts

severe thunderstorms over water

Current NWS practice commonly uses 34-knot or greater convective winds and/or waterspouts among the triggers.

Use the actual issued warning.

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