We had some lovely cloud formations here yesterday, mainly in cirrus clouds, including some virgae which were windblown horizontally for miles. They're actually snow showers of tiny ice crystals which sublime as they fall into drier air below. We also had a stunning whole-sky sunset of scattered altocumulus clouds with a very strange rainbow in the east exactly at sunset. No rain or anything. I've got a photo and I need to look up what was going on there.