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I hope you are safe and happy too Daniel. And everybody else of course. It is so great to read you enjoy the discussions. To be continued as far as I am concerned.
Don, undulatus is what the wind causes in a patch of cloud (except for the cumulus and cirrus) like the way ripples in the sand originate on the beach when the tide runs back for instance.
Whether altocumulus appears or not is a matter of the right conditions, being a flow of cold air at mid level. Just check the cloudspotters guide for a better explanation of the conditions needed to form altocumulus (e.o.). Of course the winds cause air to flow (or the other way around?) and form clouds depending on temperatures, moist etc. but undulatus is caused by the wind when the cloud is already there.
By the way: undulatus always shows its pattern perpendicular to the wind while cirrus fibratus has its streaks in the direction of the wind.
On my turn I hope this answer helps?
Yesterday evening I watched the rising of the supermoon and when I turned around to watch the sunset I was happy to see this (faint) sun pillar. Only the second time I spotted one, so I had a happy evening illuminated by a full moon in a clear sky except for some thin patches of cirrostratus.
Good food for thought Michael. About the cumulus I had the same considerations, but nevertheless I found some similar examples and it made me confirm the question of Steven. The ICA did not help really much in this case. I am still in doubt although your considerations can’t be denied.
For me it was surprising to think the Carlsbad sunset might be stratus. I did not look at it that way for it appeared to me at first glance too solid to be stratus and I had the impression it is at mid level. Nevertheless it is possible that it is stratus indeed. What do you think, is the argument of breaking up of the cloud also applicable for the hypothesis of altocumulus? For me here was the resemblance with the ac duplicatus in the ICA what made me choose altocumulus although the duplicatus is more difficult to judge from the pictures.
Anyway a nice discussion. I really like that. There are such large gray areas in cloud classification and different point of views are always surprising. The black and whites can only be found in the B&W threads.
I also think this is cumulus fractus Steven.
Don you posted some nice classical altocumulus, but be sure there are many appearances of altocumulus. The ones Steven posted “looking SW from Carlsbad, New Mexico” before and after look most to the picture that can be found in the ICA when you look for Altocumulus duplicatus. Key is that the cloud must be at mid level. Any other opinion on this?
Today we had a small front passing by (Haarlem, Netherlands) and it was looking like a solid blanket with a very distinct edge in front. Sorry no picture.
Great reds and blues in #509 Michael. Very delicate colors.
Steven I can’t choose which one is set or rise. Can you explain?
Daniel, I like the space-like atmosphere of your nebula.
No Doubt A Sunset
After a fingernail of moon by Keelin at the end of the former volume, this is a great start for Volume VIII. And a quick start as well. Surprises for sure Michael and Daniel. I try to stay in tune with the atmosphere of Nebula with next one.
Shadowing
I saw another version of your Optical Delights on the gallery Keelin. Very nice. A delight for sure.
Daniel, a sun pillar is rather rare for me. It is a nice one. I am sure you will spot more optical phenomena when you look after them when the conditions are there. I like your free iridescence.
One almost can’t tell from the picture but next one is a true sundog . The reds are already shifted to the right (or rather the cloud already shifted to the left) leaving only a hint of blues and the bright whites.
Birds Of A Feather Just A Bit Later
Great explanation of your situation in the Valley of the Sun Michael and a;so from you daniel in the Pacific Northwest. It is obviously good cloud spotting over there. Great pictures from you both.
No hills or mountains over here in Flatland. Just dunes. Nevertheless asperitas will visit us each year some times. Here is one from last summer.
