I was sitting at work this morning when my boss drew my attention to the window. The rain was crazy heavy outside and the sky was pitch-black. At one point the electricity flickered out. After a few minutes the rain had calmed down; I kind of forgot about it after that, until I came home and read the news:
http://news.bbc.co.uk/1/hi/england/london/6217514.stm

There was only a Tornado in London today! Crikey!