the cloud formations there are truly amazing and varied. i notice that some views seem to come from the same place. if that is your residence or somewhere you get to see the sunset a lot i am very jealous. i was extremely happy to see your post of the asperatus undulatus on youtube. almost 20 years ago i was in arizona and watching a fiery sunset. suddenly the clouds appeared to be rolling, roiling, almost bubbling! i even felt a sense of vertigo. one of the most amazing sights i have witnessed in nature. i have tried to explain this sunset to people without much success and i have kept my eyes open at sunset trying to recapture that experience. i thought it must have something to do with how the sun set. lol. i had almost came to the conclusion that i had remembered the event wrong and built it up in my head. NOW I KNOW! thanks again Sam. and cheers, richard.