Caught one over a field in Indiana a few years back and yeah it messes with your head because there's zero motion, just this smooth stack sitting there like a painting. Best thing I can tell you is check the wind up high on a sounding if you want to know when they'll show, they need stable air with a little moisture and some speed shear to keep reforming in place. They usually hang around 20 to 40 minutes before the layer shifts and they fall apart. Get a time lapse next time, that's the only way to really see what's happening.