Digital stills (second image is a crop) ~2248z southwest of Wanblee, South Dakota


another crop from stills


Video frame grabs of snaking tornado beneath storm


Storm over Interstate 90, displaying eddies in the striations.  Fantastic rare feature!

2005 JUNE 7: JACKSON COUNTY, SOUTH DAKOTA SUPERCELL AND TORNADO

We observed a long-lived supercell and associated tornado in Jackson County, South Dakota. Tornado touched down at 2248z and lasted about seven minutes from under the base of a gorgeous LP that was transitioning into a classic supercell. Chased this for three hours back up to Interstate 90 where it displayed tightly sculpted banding, including eddies in the striations which I captured in my stills. The eddies are a more rare and remarkable phenomena than the tornadoes. Eric Nguyen commented he hadn't seen this feature since 1998.

That was a very memorable storm for all the presentations. A photogenic LP that transitioned into a classic (while producing a needle tornado), to what became a fast-moving HP with forward flank mesos and eddies in the striations. Can't ask for much more.

Meteorologist and modeler Glen Romine gives an excellent theory for the formation of the eddies we witnessed in the striations.  Read his post on Stormtrack regarding the relationship of this phenomena to Kelvin Helmholtz vortices here.
 


Scott Blair and Eric Nguyen measure, dissect, and photograph
the interior of large hail.  Then, we ate!

ALL IMAGES COPYRIGHT 2005 AMOS MAGLIOCCO / NO UNAUTHORIZED DUPLICATION

Cyclone Road