We have a bunch of tornado clips bookmarked at the moment. Below are some of the ones that stand out, nothing too graphic:

Train vs. Tornado 2:01

Too close to a tornado 1:22

6 Tornadoes in 1 city at 1 time 1:30

Amazing Standstill Tornado 2:40

The Campo Tornado 13:45
Incredible footage of a funnel forming. Begins at about 4:00.

Storm Lapse Chapter 19 8:39
Stormchasers in Minnesota. The footage beginning around 4:00 is astounding.