Interesting cloud on Pikes Peak today

From downtown, it looks just like a veil, thinly covering the eastern cirque. It's not quite a lenticular, not blowing snow. Any weather folks out there care to educate us.
On Monday, also, there was an odd cloud over the mountains. I was riding my bike downtown at about 10 a.m. and a bank of clouds, as dark as a summer thunder storm but without any hard edges rose over the mountains, swept into the city, and pelted me with a few large, wet pieces of grappel. I went into the bank to cash a check, but the time I got out, the bank of clouds had already swooped east, and the sky was blue.