Photographic Evidence of Small, Black, Anomalous Formation moving away from direction of wind

On December nineteenth, 2002, a little after four p.m., while driving in the southern portion of York, Pennsylvania, my wife and I spotted an unusual looking small (thirty meters wide and two meters in height) black "cloud" in the Northeastern sky. When we first noticed the "cloud," it looked to be only a hundred meters off the ground and less than one hundred fifty meters from our position, in the car.
I stopped the car and got out of the vehicle to take a photo of whatever the black object was and by the time I snapped the photo (twelve seconds after our initial look at the thing) the black anomaly was approximately four hundred meters away.
I then re-entered the car and looked to see where this black object had gone. It was nowhere to be seen! (Only six seconds had elapsed since I had taken the photo.) It really didn't look like a real cloud, at all. It looked more like a beginner's attempt at making a digital cloud. It moved toward the Northeast, even though the direction a nearby flag was blowing indicated that the surface wind was moving in a straight West to East direction.
That was also the direction a line of upper (white) clouds were moving.
Besides the small, black, cloud-like formation there were no other clouds in the sky except for the line of clouds that occupied an elevated height. The black mystery object was the only one of its kind in the sky. There were no planes or weather balloons or helicopters in the sky.
The sun was near to its time of setting. Other than the above-mentioned clouds, the sky was blue. I'm not sure what else to tell you about this incident except that my wife had seen a nearly identical small, black, cloud-like formation just the day before.
We still haven't gotten the film developed. Are there any special instructions on where or how this film should be developed? Also, any suggestions on which web sites would wish to be informed of this event? Hope to hear from you soon.