I had some time to kill today, and I liked this question about violent tornadoes and T/Td's. So, I did a little digging around and came up with the following data set. All these events are particularly interesting to me for one reason or another, but this is not intended to be any sort of representative sample beyond that, by any stretch. I used the SPC Reports page to narrow down the times of day and the locations, and in each case I tried to find the *best* raw metar data, though sometimes finding a perfect metar ob left a little to be desired (without getting too anal about it). I used this page for the data:
http://vortex.plymouth.edu/sa_parse-u.html
I added the year and month to each for clarity.
In chronological order:
KOKC 990503_2328Z 14017G24KT 9SM -TSRA BKN019 BKN150 OVC250
23/20 A2959 RMK AO2
TSB28RAB28 PRESRR TS S-W MOV NE OCNL LTGICCC P0000
May 3, 1999 "Bridge Creek-Moore" OK.
KBGD 010529_2351Z AUTO 10008G14KT 060V140 10SM VCTS -RA FEW023 BKN030 OVC050
23/20 A2980 RMK AO2 PK WND 16031/2258 LTG DSNT ALQDS TSE30B39RAB17
SLP056 P0002 60002 T02280200 10289 20228 55004
May 29, 2001. An F4 struck near White Deer TX (which I barely missed due to being an incompetent noob).
KIAB 040612_2356Z 15018G25KT 7SM -TSRA FEW003 BKN030CB BKN060 BKN250
26/23 A2972
RMK OCNL LTG ICCCCG TS OHD MOV NE SLP052 WR// WND DATA ESTMD 60000
55017
June 12, 2004 "Mulvane KS" tornado. While *only* an F3, I'd bet any chaser who was there will admit to this storm being one of their career favorites. Mind-blowing day.
KP28 070505_0156Z AUTO 16011G21KT
26/19 A2961 RMK AO2 PK WND 17028/0115 SLP011
T02560189 PWINO TSNO
May 4, 2007 Greensburg KS. Whereas this ob sports the ONLY sub-20ºC Td in this whole lot, it must be pointed out that the station was WAY too far east to record what the tornado was actually ingesting. That event featured a narrow fetch of elevated theta-e, perhaps only 50 or so miles wide, and the DL was retreating at the time.
KJLN 110522_2053Z 19013G19KT 7SM FEW032 SCT045 BKN060CB
27/21 A2968 RMK AO2 PK
WND 20027/2011 SLP039 T02670211 56013
May 22, 2011. Joplin. I would have preferred the 2153Z ob, but the Plymouth site only offers 2053 and 2253 (which was post-event).
KOKC 110524_2128Z 14022G32KT 4SM TS HZ FEW034CB BKN044 OVC150
26/21 A2944
May 24, 2011, EF5 that crossed I-40 in west-central OK.
KCHK 110524_2155Z AUTO 15018G23KT 2 1/2SM +RA SCT011 BKN043 OVC070
25/22 A2943
RMK AO2 VIS 1 1/2V5 P0012
May 24, 2011 EF4 that tracked near Chickasha OK.
KOUN 130520_2035Z AUTO 19003KT 10SM TS
26/22 A2968 RMK AO2 LTG DSNT ALQS
May 20, 2013 Moore OK tornado.
KSLN 130528_2153Z 16027G33KT 10SM FEW042 SCT050
30/22 A2957
May 28, 2013, over-an-hour in one freakin' spot Bennington KS EF4 wedge.
KOKC 130531_2252Z 15018G23KT 10SM TS FEW050CB BKN150 BKN300
28/22 A2957
May 31, 2013 El Reno OK.
Apparently, if you want a violent tornado, you probably ought to bring a Td of at least 68ºF or so to the table. Other than really hot days, I don't think there's much point in focusing on T's, because they change fast in a storm environment.
Anyone want to dig up some more examples?