UFO sighting ottawa October 2012

The current date is October 22, 2012. The date of the sighting occured October 21, 2012 at approximately 2230 hours. I'm a security guard and work the night shift. On my way to work travelling southbound on the Champlain bridge Ottawa Ontario I noticed something strange. A bright object in the sky moving erratically in no general pattern. At first I thought of spot lights or someone shining a flashlight. Although these could be possiblitities, I do not believe them to be the truth. The light i saw looked like a typical flying saucer except upside down. I didn't realize this until I started sketching diagrams of what i saw. This light appeared to keep a steady altitude in the low lying clouds that were starting to cover the west end of ottawa travelling east. It was almost like the object was using the low lying clouds as cover to remain undetected. If it wasn't for the fact that I happen to be starring right at it as i came over the bridge I would have never noticed it. Saying this it was quite visible to the naked eye if you were looking right at it. It moved quite quick then slowed down then changed pattern and continued this for approximately 10 minutes. It was very odd. I keep an open mind, but i do believe science can explain almost everything. It takes a lot to convince me that something strange is happening. This "UFO" was indeed an occurance that I can't explain.