[TowerTalk] Arc During Lightning Storm

[Mike W2LO]

  A couple of times in my life I have been in a building during a lightning 
storm, as today, and I hear a "zap" arc-type noise during a close strike.
Today I was in a garage during a storm and we had a close strike, but not 
terribly so, and I heard a loud "zap". All the ac circuits and telephones 
worked afterward (there were no external antennas, etc.) What am I hearing?

                                                   Mike  W2LO