http://www.naturgewalten.de/061002quirla.htm

http://www.tornadoliste.de/

http://www.faz.net/s/Rub2542FB5D98194DA3A1F14B5B01EDB3FB/Doc~EAEAB701BAF284B88A182671EC67CDF1B~ATpl~Ecommon~Sav~Alk~Evideo~Sreuters~S141105tornado_l~Pwmv~Aplay~Evideo~Aext~E~PV_H.html