I got off of work tonight and started on my way home from Mammoth Lakes to June. Right past June mountain I noticed a bright light hovering in the valley over towards silver lake. The brightness looked like it could have been a helicopter spotlight but it was flying irregularly and very fast at that. Almost as soon as I questioned what it was noticing no blinking red or blue lights the orb flashed and I was blinded by white light. Boom, it was gone. No trace or sign of any aircraft. What had so blatantly drawn my attention seconds before had seemingly vanished. I had goosebumps and cannot think of seeing something like this ever before.