Interesting clouds over Austin Thursday morning

We received a handful of photos in the First Warning Weather center this morning of what appeared to be a front moving through Austin. Contrary to what is usually responsible for causing such a sharp demarcation in the clouds, this was actually not caused by a cold front. There is a weak, diffuse cold front blowing through at the low levels of the atmosphere this morning — but the interesting cloud features seen here are 10,000 – 20,000 feet high.  So what’s the deal? The boundary of light / dark clouds appears to be caused by a mid/high level moisture…