Noticed object depending from Clow coverage as I approached intersection. The object was ellipt

I noticed the object decending from the clouds as I slowed down for a red light. The object resembled an oval shapped hockeypuck, and was standing on its end and rotating about once every 3-5 seconds. It appeared to be light in color on the opposite faces and dark around the rim. The object decended from the cloud and moved towards the left and appeared to come to a complete stop, while continuing to rotate. It then slowly accended back into the cloud coverage. This was not a balloon. It had clearly defined edges and was very stable in its rotation, unlike a balloon which wobbles in the wind. This object was not drifting, it was definately under powered control.