“This is a 10x time lapse of the magnificent Grand Island-Aurora, Nebraska supercell and tornadoes, as filmed by storm chasers Dick McGowan and Darin Brunin on June 17, 2009.”

The tornado was ultimately rated an F2. The sped up video in the first half gives a good view of the essential character of a wall cloud. Many observers have trouble distinguishing scud and fracto in storm clouds and frequently mistake these for wall clouds.

The intake flow is clearly seen in this video, and this action plus the fact that the wall cloud is a descended product (ie connected to the cell base)of the intake flow are the two main distinguishing features, compared to scud and fracto.

Finally, some storm chasing video that actually conveys some real information rather than the amped up shouts of post-pubescent males…:)