1997-07-15 - Tucson, AZ - Triangle

I saw one triangular shaped craft, it had two very big randomly flashing lights(bluish white color).

This was a roughly triangular shaped craft with two whitish blue brilliant lights which lit up the craft making it's shape visible. The craft seemed to be huge because it was above the clouds and the size of it was amazingly big compared to if there was a 747 at that height. It had a sound of that which if you took a very large electromagnet and applied a considerable amount of current to it(a sort of a deep humming sound with a pulse in it). We saw that the craft just seemed to be passing by going north then changed direction to northwest. The sky was clear with some clouds and some stars. The color of the craft seemed to be a metallic bluish black surface. Again, the lights were very bright and brilliant, alot brighter than any aircraft I've seen.