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It is difficult to be sure of, Pamela. Anyway, you spotted a very impressive storm system. Did any tuba develop? In that case it is likely.
You spotted a great B&W clos-up of intortus, Michael. Keelin spotted it even with Offspring😊. Love the interrupted radiatus, Ruth.
WavesGreat ones above. I love #1439 and # 1440, Michael. Deep and rich like Ruth commented. Love your pileus and Melon Balls too, Ruth. And wow what an energy seen from above, Bill. Must be great to be up there.
The Milky Way
Last Sunday there were lots of asperitas skies in France, Belgium and the Netherlands, as harbingers for wet and wild.
Keelin, what a feast to celebrate pride month the way the sky did when you were on your way ‘tween Colorado and New Mexico. When you ask me, this is one for the calendar!
There is delicate iridescence in Not So Bold, Ruth.
Next one is a photo from 2021 and I don’t remember whether I shared it before. I was digging in my archive because I wanted to check when I saw the the last time. Now I hope to spot noctilucent clouds this summer again.
Nocturnal
One can reflect on Pondering that is an ingenious and intriguing fotograph, Keelin. I just saw today an amazing circumhorizon arc from you on the gallery waving like a flag over the moutains. Wow that’s a fantastic one too. It must have been a lucky day, I suppose.
Clouds Needing A Shave is very funny, Ruth. Maybe the furry @256 by Michael might need a shave too.
Boom
Your Siblings are marvelous Keelin. And the pileus by Ruth and Michael are too. Bill, your thunderstrom over Nebraska is very impressive and makes one feel small. Love it.
Pileus
Thanks for explaining your thoughts Don. It is fun to discuss things this way. For me your explanation proofs that there are so many interpretations possible, but I still think the situation of the first CAD you refereed to – and in which gravity waves were mentioned – is very different from the one with the shelf cloud. I think that the processes in a cumulonimbus producing a shelf cloud on its front involve much more power and different forces than the processes involved with the relatively more gently formed gravity waves. Who will know?
Yes, Don, forgive me for saying so, but you missed something big. The striations you see on the CAD of 23d of June are in a shelf cloud. They are explained very well in a very different way. The situations of the clouds where gravity waves were mentioned and the situation of the shelf cloud, are not the same at all.
Hello Don, gravity waves are certainly not restricted to nacreous and noctilucent clouds. It was the context in which I found the first explanation of gravity waves. They are just two – amybe extreme – examples. Here is another link that gives clear explanations – including examples of the way gravity waves are induced – for the lower clouds: Gravity waves.
Examples of non-garvity waves are a lot of undulatus appearances we are used to in our troposphere. They are in most cases the result of shearing winds with different speeds. Here is part of the text about undulatus form the Resources entry of the menu on the CAS site:
“Undulatus usually forms when the air above and below the cloud layer is moving at differing speeds and/or in different directions. It is the shearing effect of the two airstreams that gives rise to the cloud billows, which form perpendicular to the wind direction and can resemble ripples on a sandy beach caused by the movement of water.”
Best wishes, Hans
A nice whale by Ayaan, and a barking dog by Ruth. Is that because he saw Billy coming? Well spotted, Keelin. Good old Billy, this close! Love it.
Lady Feeding The Birds
Pamela, once again you spotted an amazing sky. Iridescence all over indeed. I think they are Altocumulus and the straight lines suggest also undulatus, although the rest of the clouds don’t seem to want to fit in this somehow. Love it!
Hans
