If it was Jupiter I think its position change over an hour would have been pretty noticeable... and the smooth, slow brightening and fading pattern doesn't fit atmospheric turbulence. Thinking more... California (right?), 3:30am (Pacific Daylight Savings Time?), facing East. Too early for reflection from a high altitude balloon? Would you get that bright a reflection from the balloon or its cargo, with that much variation if it was turning slowly?