On April 9th, at 7:05 AM I left from my home in Grand Ledge for work In Lansing, MI, by the Lansing Capitol Airport. Driving East on M-43 past M-100, past Nixon Road, and at just past Upton Road I noticed an odd rectangular shaped cloud at 10 to 11 o’clock. The cloud stood out because the rest of the clouds heading East where at the horizon and they all had a gray to purple color, time about 7:10AM. The clouds did not block the sun since it was rising in the East.

I thought the cloud was an airliner getting ready to land at the Lansing Capitol Airport because I thought the sun light was reflecting off the plane.  As I continued to the stop light at N. Market Place Blvd, I decided that it was not a plane, but I thought how odd this cloud was, rectangular shaped but the edges and corners were not sharp rather cloud like and white in color.  There was quite a contrast between the rectangular cloud and the clouds around the horizon.  The sky above the horizon was clear except for the white rectangular cloud.  The time was 7:16AM.
I drove on and got on 96 West and did not notice the rectangular cloud at all.  I exited on Grand River Avenue heading East to where I work near the airport.  I drove past the Marathon pumping station and noticed the rectangular cloud again.  As I looked at while driving, I noticed that the cloud evaporated from the inside out.  I thought this was a very odd phenomenon.  I have never seen a cloud evaporate from the inside out before in my life.  The time was 7:20AM.
No other airplanes were in the air.  Is this a normal aerial phenomenon?