This is what happens when you go out to sea for a relaxing day of fishing and a storm system suddenly moves in, causing twin waterspouts. Video after the break.
Waterspouts normally develop as their parent clouds are in the process of development, and it is theorized that they spin up as they move up the surface boundary from the horizontal shear near the surface, and then stretch upwards to the cloud once the low level shear vortex aligns with a developing cumulus or thunderstorm
