Hurricane Sandy: Why is it a 'superstorm'?

The video explains how air moving south from the Arctic will collide with Hurricane Sandy as it moves northwest. The convergence of these storms near the jet stream, along with other factors, will lead to the formation of a Superstorm. This Superstorm is expected to hover over the eastern United States for several days, causing significant weather impacts.

What new insight or understanding did you gain from this video?