Take a close look within the eye of Hurricane Dean. There are actually several distinct sub-vortices, spiraling around within the center of the eye. Large Hurricanes often develop such phenomena. The spin around the center induces these smaller spins that also revolve in a counter-clockwise flow. Check out the still picture below.
The picture highlights possibly a “trio” of sub-vortices, though check out the picture below of Hurricane Isabel. Isabel remained a CAT5 for many days while at sea. During this time the eye did some amazing things such as captured in the image. This shot actually displays five distinct vortices, cycling around a center one.