CLA - although I wasn't thinking about rotation as I watched those clouds, the area where the pointed end of the arrow is was definitely moving faster across the sky (L to R in that picture) than the area where the arrow starts. In other words, I agree with your thoughts that my picture might show the beginning of some rotation.
For reference, the picture was taken at about 4:50pm, in Ashland on the SW end of Little Squam Lake (by the covered bridge there), looking more or less NE from there.
Great pictures you got there, I've never seen anything quite like that in NH, and I've been watching the weather and casually studying it my whole life, and mostly from out on Squam Lake...
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