I was chasing with Gabe Garfield, Dan Dawson, Robin Tanamachi, and a group of several others that day... We were driving north on 1443 S of Kellerville when the folks in my group started to talk about a possible large tornado to our northwest. For the life of me, though, I couldn't get a good view of it (I'll attribute that to me having to pay attention while driving!). Your vid capture actually clears things up a bit for me... We stopped about ~3-4 mi S of Kellerville (+/- a mile or two... don't have the exact log up right now) to see what we could see, and I pulled the following vid cap, facing the northwest @ approx 8:46 pm:
Now, the "low-hanging doohickey" that's being blocked by my wiper blade appears similar to the low-hanging doohickey that's on the left side of your vid cap, and the brightness on the right of this vid cap looks like heavy precip that's in the center of your vid cap. This would corroborate what our group was seeing farther north... I wish I would have thought about panning the video camera to the right (i.e. north), but I was too busy trying to find it w/ my eyes to think about moving the camcorder. At any rate, here's a vid cap taken from approx 8:55pm when we were basically in Kellerville:
I think the "feature of interest" may be in the background to the right of the bright "flash", where it looks like a funnel/tornado may reside. By this time, camcorder issues continued as I accidentally slipped it out of manual focus and into auto focus, thus yielding the out-of-focus vid.
This probably isn't much help, but it's interesting nonetheless. Gabe and/or others in my group that night may have better video, though. At least my daytime video turned out alright... Ugh.
To refresh some memories, below is the text recap of this tornado from a PNS from AMA:
RATED EF-3 (MAX WINDS 138-167 MPH)
PATH LENGTH: 7 MILES
MAX WIDTH: 1 MILE
TORNADO BEGAN 8:45 PM...ENDED 9:00 PM
0 FATALITIES / 0 INJURIES
THIS TORNADO DEVELOPED FROM THE SAME STORM THAT MOVED JUST EAST OF
MCLEAN. THE INITIAL CIRCULATION DEVELOPED 8 MILES NORTH NORTHEAST
OF MCLEAN AT 8:45 PM AND WAS INITIALLY MOVING NORTHEAST AT 40 MPH.
AS IT CROSSED FM 2473 AT THE MCCLELLAN CREEK BRIDGE...HIGH-TENSION
POWER LINES SUPPORTED BY DOUBLE WOODEN POLE STRUCTURES WERE BROKEN
OR SNAPPED AT THE GROUND AT SEVERAL LOCATIONS. NUMEROUS HARD
AND SOFTWOOD TREES WERE DEBARKED WITH ONLY STUBS REMAINING. AT 8:49
PM...THE TORNADO MOVED MORE NORTHWESTERLY AND ACCELERATED TO 45 MPH.
A LOCAL RANCHER...WHO LIVES ABOUT 7 MILES NORTHWEST OF KELLERVILLE
HEARD THE TORNADO APPROACHING AND TOOK SHELTER. DAMAGE TO HIS
PROPERTY INCLUDED A COVERED PORCH THAT WAS COMPLETELY BLOWN OFF AND
STEEL ROOFING WAS PEELED BACK ON THE SOUTHWARD FACING SIDE. A BRICK
CHIMNEY ALSO COLLAPSED. SEVERAL TREES...AS MUCH AS 200 FEET FROM
THE WEST EDGE OF THE HOUSE...WERE BLOWN DOWN. A BUNKHOUSE ON THE
PROPERTY LOST HALF OF THE ROOF. THE STEEL ROOF ON THE RESIDENCE
HOME WAS PEELED BACK. AN ANCHORED LARGE STEEL FEED BUNK WAS PULLED
OUT OF THE GROUND. SEVERAL POWER POLES WERE ALSO SNAPPED AT THE
GROUND.
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http://www.srh.noaa.gov/ama/march2007_tornado_outbreak/LBBPNSAMA.031728