In the Clouds Photography

A low precipitation (LP) supercell acts like a vacuum sucking up dirt into its base about 15 minutes before producing a tornado.
A flared mesocyclone base has a characteristic bell shape. This storm is rotating counter-clockwise and sucking dirt into cloud base just minutes before a tornado develops.
A tighter concentration of dust and funnel begin to form.  Meanwhile, a clear slot has developed between us and the dust as the rear-flank downdraft (RFD) enters the back side of the mesocyclone and wraps westward.
An obvious funnel has formed toward the southern edge of the mesocyclone.  At this time the storm is actually producing baseball-size hail a few miles straight ahead – west of the mesocyclone – as it transitions to a classical supercell.
The funnel lowers slightly.  Is it a tornado yet?  Maybe, though most would say it's a funnel.  The distinction is whether the circulation is on the ground.  I suspect not or else the dust would be evident directly beneath the funnel.
Now, without a doubt, it is a tornado.  A column of dust or condensation has now formed below the funnel and almost instantaneously connects to the funnel just above.
The tornado strengthens (this shot uses a zoom lens) while moving northward slowly very close to Hwy 63 around the small town of Elba.
Our group was east of the tornado with lightning strikes nearby but no precipitation while some friends choose an approach from the west and got turned away multiple times by very large, isolated hailstones (up to baseball size).
The tornado continues to intensify and moves north at only 5 mph.
It's relatively rare to see the northern edge of the mesocyclone so clearly — it is often obscured by precipitation.
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 beaver tail cloud begins to develop on the northern edge and extends far to the northeast — this is visual confirmation that air is flowing in from the northeast and wrapping around to the west side of the mesocyclone.
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.
The tornado is actually past peak though the dust/debris column is quite large.  It has been on the ground for nearly fifteen minutes by this photo.
As the last photo in this set is shot, a mid-level funnel pokes out the back side of the updraft approximately 10,000 feet above the ground.  This is harmless and will not touchdown to become another tornado.  The Elba tornado dissipates without any deaths or injuries to humans — I'm not so sure about livestock.

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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