Boomerang/Triangular Huge dark object

I was in my car at work waiting for my relief to arrive so that I could leave. My shift is over at midnight. The sky was completley covered in

clouds but I noticed a small spiral of clouds to left. Nothing major, it was more of a swirl than spiral. I thought, maybe HAARP? I took my

camera out, put it on the night setting, got out of my car and took two pictures. I checked the preview to make sure the camera captured it

because it was so dark and there's barely any lights in the area. I started looking around the sky and was shocked to see a huge dark shape in

the clouds, high above my car. The spiral was to the left of my car and the shape was pointing in that direction and directly above me. I kept

thinking maybe it's just a break in the clouds and all I'm seeing is the night sky. But the fact that it had visible straight lines and what

appeared to be, a sharp point, made me want to take several more pictures. It was not moving at all. There was absolutely no sound or lights. I

don't know how low the clouds were but the object seemed huge. I don't know anything about cloud altitude so it's hard to make an accurate

guess of how high or big it was. I want to say the width appeared to be as wide as maybe 5 passenger jets side by side. I observed it for about 6

minutes until it seemed to slowly disappear and clouds filled in the area. Something was there, that I know.
You can see power lines going across the images that have the object. My camera time is only off by the AM and PM. I only reduced the size of

the images so that I could email them. I did nothing else to the images.