I was at the school today for the Christmas Bazaar when two friends came to my table and asked if I had my camera with me. Of course I did. They said that’s wait at my table for me and that I should go outside and look at the clouds to the north east. This is what I saw. I have no idea what might have caused this pattern. The rest of the sky was filled with a thin layer of clouds like the surrounding clouds in this picture, except to the west where it was clearing up. Strange.
UPDATE: A friend of mine identified this phenomenon for me. It is called a Fallstreak hole and the formation occurs when part of a cloud of water droplets freezes into ice crystals. Here is the relevant page on Wikipedia and also a page at The Cloud Appreciation Society.