Circular craft, blue on top, white on bottom, over narrows. Size was about size of bb held at arms length.

While driving west on 6th Ave, going home from doctor appt, I was stopped at stop light at 6th Ave & hey 16. While waiting for light change I noticed this object hovering above Tacoma narrows. It was blue on top and white on bottom. At first I thought it was a plane but as I watched it I realized it didn’t have wings and was motionless. While looking directly at it, it just blinked out and was gone. Light changed and I went through and turned right into the fitness center parking lot west of highway 16 on the north side of 6th Ave. I looked at the same location but couldn’t see it anymore. I scanned around to the north and picked it up again. About 45 degrees north from its previous location. As I watched it, it blinked out again. It reappeared again a few seconds later directly north of 6th Ave, about 45 degrees further north from its previous location. I grabbed my camera phone and was trying to get it recorded when it blinked out again and was gone. I watched for a few minutes but it never reappeared. I reported this to MUFON when I got home. I’ve never seen one if these before.