Found my thunderstorm diaries that I used to keep (well 3 of them anyway).
By this time in '97 we had already had 5 thunderstorms, 2 of which were all nighters. According to the diary, I classed a thunderstorm as being over 30 minutes long, anything shorter was classed as 'a day with thunder' of which we had had 23.
Compare that to 2011, where we have had 2 thunder days and only one of those days could be considered a thunderstorm.
I'm sorry i just don't buy it when people say we are having the same amount of storms as ever.
On a separate note, it is almost quite smoggy today.