Tune my Block?

My neighbour had mentioned to me about his experiences of a humming, resonating sensation that would last for about half an hour and would sometimes scare his daughter. Well, this morning I understood what he meant.

There was bad weather at around 5 am and we could see lightning and hear thunder outside our window. But that was not what woke us up. The whole room felt like it was vibrating and resonating to a tuning fork (the pitch sounds the same too). It would get very loud before the lightning and thunder then died off and the whole process repeated itself. Not only did we sense the resonance and vibration, the room felt warmer too!

I'm sure it has something to do with the height of my flat and the atmosphere (+/- ve charges) that caused the block to behave like a tuning fork. In any case, wow... it was quite an experience albeit a sleep depriving one...