Wow, amazing videos of the Webster/Nuckolls co. F4 Ryan... I hadn't seen those before. That tor definitely falls in the far bottom part of the sfc T/Td distribution for a very long-tracked violent tornado, with about 66/59F (at best) in its inflow environment. The rash of sig tors in the EAR-GRI corridor had even lower T/Td than that. Remarkable.