Vortex, funnel ghosts:

[Chronos]

A vortex is a very strange and mysterious phenomena. They usually take on the appearance of a swirling funnel shape when moving about. They can also appear in pictures as being long and narrow and having a tread like design within their body. They are readily confused with a speeding orb when they slow down and take on this straight & narrow look. It's not presently known if a vortex has ever been captured on video tape. It should be noted that they are often felt as a cold spot.