My girlfriend and I were traveling West on the interstate outside of Phoenix, AZ on a Monday late afternoon. The sky was clear except for this jet black cloud. It was about as big as your fist if you held it up to the sky. Not only was that one black cloud odd but the cloud was moving much faster than a normal cloud would. I know this for we exited the interstate and were sitting at a red light, watching it move. The cloud was moving in our direction and it started to alter its shape from cloud like to thinner and taller and it split in to two pieces. The two black clouds then shaped disc like took off in the opposite direction fast and dissapeared. The whole thing took about 4 to 4 1/2 minutes. I wish I had a camera at the time and now carry one in my vehicle.
It was amazing!
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