big bada boom

Just got power back after an extremely loud and prolonged thunderclap (~20 seconds) that resulted in the electricity being out these past 2 hours.

I can't find any news on what may have happened, but I've never experienced thunder like that - I figure either lightning struck in our parking lot or there were a lot of strikes, one after another, somewhere else (I'm guessing the latter as there is no crater in my space) :P