Just found this on You Tube which was only put on in September 2012 so not sure if anyone has seen it.
It shows a tornado rushing in over the hill from Arillas and sweeping through the main street, gets really interesting about 2.5mins in.
Some great footage of old San Stef (September 1993) as well so its worth a look.
Dimitri at the Little Prince told us about this event a few years ago, great that someone did such a good job recording it.
Luckily only one person was slightly injured which is amazing given the amount of debris flying around.
I watched a Tornado out to sea from San Stef in late September 2008 which is of course thunderstorm season when these events can occur.
Andy