Dim blue/grey orb, at low altitude.At approximately 9:40 p.m. 11/8/2012 I was home alone watching t.v., my dogs began to bark, and I felt the house rumbling. As if someone was listening to a loud stereo in front of the house. Instead of a rhythmic thumping, it was more of a constant stub-audible rumble.I walked out front to see what the dogs were barking at and saw nothing in the street, but when I stepped out from under the eaves, I felt heat on my back. I looked up and at tree top level above the house was a blue/gray glowing sphere. As soon as I looked up, it took off due east, like it had been shot from a gun. It got brighter as it picked up speed and about two miles it bounced north west, like a tennis ball hitting a brick wall. After the bounce it was only visible for a flash and then disappeared.Two noteworthy observations. First, the sky was overcast with low clouds, and it was well under the cloud cover. Secondly, as it took off from over the house, I could feel a sub-harmonic vibration, in the driveway. But it never made an audible sound.There wasn't much to it, but it was a hair raising couple of minutes.