While talking to my son before bed, I kept seeing a flash so quick with no noise appear like a blink of an eye. I ignored it and thought it was lightning or I was tired but it kept happening every few minutes, then my son (who is 13) asked if I saw it too. We blew it off and I went to bed but it happened again...so bright it was like a strobe but only one flash and no thunder.

We decided to go to the backyard to see.  There was distant lightning, but this was different in quality of light we kept seeing.  At one point a strange vibrating hum outside- like when you rub your finger around the rim of a wine glass, that deep vibrating hum echoed around us...then was gone.  We decided to call it a bus and lightening...but it wasn't.  I'm sure there's an explanation I just don't know what it is.