Strange mirage disturbance flying through the sky at high speed over Oakland California.I witnessed what looked like a ships wake in the sky It was transparent/mirage like in appearance, as if someone dragged a ball though the water by a string viewing it from beneath the waves. I only noticed it when it moved, seemed to have been there at a stand still as its movement drew my attention to it. The disturbance only lasted for a ½ second to 1 second traveling east to west at a very high rate of speed. There was no light emitted, just an area that wasn’t as dark as the surrounding sky.For the last year or so I have noticed strange happenings in the areas night sky. From lights that can only be seen with a pair of binoculars coming head on towards each other at extreme altitude, (approx. 80,000ft.) only to have one disappear as they meet, to flashes of light that just appear and then disappear just as fast. These strange sightings have captured my attention that I keep watching nightly for them. Unfortunately they happen too fast to photograph and are too far away to zoom in on. I will try to anyway, someone needs to see these things. Glad to have a someone to report this to.((NUFORC Note: Witness elects to remain totally anonymous; provides no contact information. PD))