9 MAY 2006: ANNA/WESTMINSTER, TEXAS TORNADOES
Violent tornado approaching Westminster, Texas May 9, 2005
A storm in north central Texas produced three tornadoes tonight that I observed along with Eric Nguyen and Scott Eubanks. The first tornado was four miles east of Gunter, Texas in southern Grayson County around 0210z. The second tornado was northeast of Anna by less than one mile at around 0329z and then the third, forming about five minutes later, was approximately seven miles east northeast of Anna around 0337z. We saw the latter tornadoes after having met up with James Clarke.
We originally targeted the intersection of the cold front and outflow boundary in central Oklahoma and spent much of the day hoping CI would occur in more chaseable terrain. When it became clear that wasn't happening, we headed home for DFW with only the slimmest idea that something would fire south of the river along the front. We were south of Gainesville when the storm went up, and, observing the dramatic signs of an explosive updraft, we turned around to chase. We weren't aware of any boundaries in the Red River Valley, but knew the dewpoints were high and expected that something around 4000 j/kg still existed in the region.
When we turned back north to chase it, the backsheared anvil was dramatic, with a strongly knuckled appearance and extreme bulges on the underside. A flanking line was exploding in a small row, presumably down the cold front. I have stills of all this which I'll post over the next few days.
When we reached the storm, however, it had a linear
presentation and no obviously dominant updraft base. We speculated if
such a multi-cellular segment could even support a RFB. We dropped south
where a new core seemed more promising and found a base for it, a large,
smooth, bowl shaped lowering west northwest of Gunter. Eventually this
produced the first, mostly-unknown tornado around 9:10 PM. We were
unable to report this until about twenty minutes later. After this
tornado lifted, the storm organized and became isolated, and the updraft
evolved a more striated appearance. However the tornado potential looked
slim and we noted some cool outflow in places.
All imagery © 2006 Amos Magliocco