During a recent thunderstorm in an urban area, I saw lightning strike within about half a mile, estimated as such because I heard the thunder about 2 seconds after I saw the strike. What surprised me was that I heard an electrical-sounding bzzzzt that was simultaneous with the strike, and lasted for the fraction of a second that the bolt was visible. This sound could not have come from the lightning bolt itself, as I heard it well before the thunder.
There are power lines not far outside my window. Did the lightning strike send a surge through the grid from half a mile away that was heard at my house? This is about the only explanation I can think of for the timing of the sound. If it did, what actually causes that bzzzt noise?