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Whirlwind

School evocation [air]; Level druid 8, shaman 8; Domain air 8, weather 8; Elemental School void 8

CASTING

Casting Time 1 standard action
Components V, S, DF

EFFECT

Range long (400 ft. + 40 ft./level)
Effect cyclone 10 ft. wide at base, 30 ft. wide at top, and 30 ft. tall
Duration 1 round/level (D)
Saving Throw Reflex negates; see text; Spell Resistance yes

By the way...
Most ships are too large to be affected by this spell, but loose objects and creatures on the ship's deck may still be affected.

Source Skull & Shackles Player's Guide