In the Clouds Photography

After calling in the tornado to the Weather Service, I shoot this overexposed picture about 3 minutes after initial touchdown.
There is cyclonic circulation to the dust column as well as a downdraft causing the curl on the left edge of the debris.
The mesocyclone is quite narrow on this tornado-producing storm as is the updraft.
The tornadic circulation dissipates for a few minutes as the mesocyclone appears to narrow and intensify.
Rain fell on our position so we moved west while a new funnel formed and created this more classical-looking tornado.
The tornado continues moving south along the Weld and Morgan County border near the town of Weldona.
In this position east of the tornado, contrast problems are typical and one needs to bracket - this exposure is 2 f-stops above what the meter dictated but the ground and cloud remain too dark.
The tornado has now been on the ground for 15 minutes and is beginning to dissipate.
The tornado weakens and we pack up our gear and try to re-position closer to the storm in case it produces another one, however,  this storm did not produce any additional tornadoes.

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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