A huge orange ball over Lake Hills in Renton WA, that turned into a triangle over Boeing field and disappeared.

Driving south on 405 towards Renton my husband and I saw a huge orange ball of some kind hovering over Lake Hills.  My memory is not vague, I will never forget feeling if what ever it was dropped (it was still at the time) it would blow away all of the top of the mountain.  It started moving towards the lake and instead of turning to go up to our house, my husband slowed down and we watched as it slowly went over the lake, down over Renton Boeing field, then in a heartbeat it turned into a triangle and disappeared.  Not up or down or sideways, just disappeared.  I told my neighbor and she laughed at me.  Days (maybe a week) later she said there was a huge crowd (I think in PA) who said they all saw the same type of thing, which was reported in the newspaper. I called a UFO reporting # (in my memory it was Operation Blue Book) and was told "people see that type of thing all the time".....
Witness indicates that date of incident is approximate.  PD