In the Clouds Photography

The tornado strengthens (this shot uses a zoom lens) while moving northward slowly very close to Hwy 63 around the small town of Elba.
A vehicle flees the tornado (a wise choice) as it reaches its peak. The National Weather Service officially rated this a F3 (Fujita scale runs from F0 weak tornado to F5 strong).
A wider view of the storm shows that all air at cloud base altitude is clearly wrapping inward from all directions and spiraling counter-clockwise upon reaching the mesocyclone.
There are actually two tornadoes in this photograph. The first is quite near and has an obvious funnel; the second is at the end of the road as a swirling dust mass beneath a tilted rotating updraft cloud. The foreground tornado remained weak and moved south (left) while the background one grew bigger and moved northeast (right).
Both dust columns become more visible with an embedded condensation funnel in the foreground tornado. Note more headlights at the end of the road near the second, stronger tornado.
Cars continue to come down the road despite this tornado staring them in the face.
Two funnels drop out of this cloud - at least one is a tornado with a brief dust/debris cloud at the ground - on a rare Colorado August tornado chase.
This mid-level funnel has little chance of touching down and becoming a tornado. At one time, three funnel clouds were simultaneously visible to our eyes yet nearly impossible to render on film because of lighting conditions.
A small funnel forms at cloud base along with a very thin veil of dust column below but lasts under a minute. This represents the lowest end of the tornado spectrum.

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Suggested reading & related info:

Book: Tornado Alley. Monster Storms of the Great Plainsby Dr. Howard Bluestein
Book: The Tornado: Nature's Ultimate Windstormby Thomas P. Grazulis
Magazine: Weatherwise
Web: Storm Track
Web: TESSA Weather Bulletin
Web: Storm Chasing with Safety, Courtesy, and Responsibility
Web: SPC Tornado FAQ