Picture of a tubular dust devil from the AZ desert. Photo courtesy of NASA. See: http://www.nasa.gov/vision/universe/solarsystem/2005_dust_devil.html http://en.wikipedia.org/wiki/Dust_Devil
Picture of a tubular waterspout off the Florida Keys photographed from an aircraft coming from NOAA. Location: Florida Keys. Date: September 10, 1969. Image courtesy of Dr. Joseph Golden, NOAA. See: http://en.wikipedia.org/wiki/Waterspout
A tubular landspout near North Platte, Nebraska on May 22, 2004. See: http://en.wikipedia.org/wiki/Landspout
A triggered lightning strike. Triggered in order to create a solidified 'fulgurite.' Notice the bright inner bolt, and the outer columnar / tubular sheath. Notice also similarity to the morphology of many waterspouts, landspouts, dust devils, and tornadoes. See: http://home.att.net/~amcnet2/album/theevent6.html
Inner "charge sheath" and outer "turbulence" vortex. Screen capture from video. See: http://youtube.com/watch?v=7J9d76UmpVU
On rare occasions, tornadoes may be seen with a luminous inner core not unlike a neon light or other glow discharge tube. See: http://www.science-frontiers.com/sf105/sf105p11.htm
