This photo was also taken today (Oct. 14th.) This shows where the clouds end after the morning rain. I would assume that more than one cloud type are probably shown, but for now, I would say these are cumulonimbus. Rain (obviously, look at the rain drops on the window!) leads to the nimbus suffix, and the large, general lumpy-ness can be seen towards the brighter portions of the picture. If I had to choose another type, I would say nimbostratus. I am sure there are some sheets in there somewhere.