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Well, this spiral cloud is certainly peculiar. I am just guessing but it might be contrail. The combination of winds or lack of winds with induced vortices by the airplane – as in the case of the vortex Crow instability – might give this spiral appearance.
Nice pictures anyway, especially the first one.
It is not a von Karman vortex street I think. This should be V.C.I., vortex crow instability. Googling on this you will find examples like the first picture. I did not find examples on the internet of these perfectly circular leftovers of the contrail. They seem to be the last phase of the contrail before disappearing completely. There are also some recent examples on the gallery of this phenomenon. The wingtips of the airplane induce vortices that make these strange patterns in the contrail. Last few days over here were very favorable for this phenomenon and living near a lot of air traffic I could make a lot of new pictures of even stranger patterns.
Yeah, the Asperitas can be found in the online ICA and it even was in the news. Unfortunately no Crow or Holmboe instabilities or von Karman vortices. You can’t have it all.
Many tanks for the analysis Michael. With your NFL rating method my own Asperitas events score a rather moderate picnic level I suppose, knowing that you scored the second picture at medium level, … but nothing wrong with a good picnic-time.
In my attempt to roughing it up just a little:
Ending with just a hint of Asperitas behind a Dutch windmill.
Yes indeed Elseville Michael, that is where you think you are when you are watching these skies. And nice to have the opportunity to see it develop. Very interesting observations you make.
Your first one is local and I recognize the situation from the gallery, but the second one is quite covering the sky. This shows a type that can be seen more in the gallery and is very characteristic but does not show the large irregular undulations. Much more a somewhat regular pattern I would say. Choppy sea you call it and a choppy sea it is for sure.
I would appreciate your opinion on the next two pictures taken within a few minutes in different directions some years ago. In reality a bit more grey, but a little enhancements shows better what pattern attracted me in the view. Upside down or not I am in doubt.
Very interesting observations Michael. I haven’t seen Asperitas that much to add something to it. The irregular undulations are intriguing and the role of the winds and sinking or rising of air masses must play a role. Your Asperitas Lite is a very beautiful example.
This looks like a small part of the sky where it shows? That would be something I have seen also on a few occasions and although the characteristic pictures of Asperitas show dramatic structures, in cases that I saw Asperitas it appeared not that dramatic. Maybe because the land over here is flat except for the dunes. I read in the Dutch version of Wikipedia on the subject Asperitas that it occurs often in the Great Plains of the USA in the morning hours or midday following convective thunderstorm activity. That fits I suppose.
Two years ago I saw this one looking to the south. In the middle of the wide angle picture here under (rather dramatized by enhancing) you can see the characteristic undulations. Certainly not filling the sky.
Almost at the same time in the East …
Ha! Party mood, spinning clouds, a drunken camera, boozy inspirations. I like them. When this one flies over and looks you in the eye, you might come to the conclusion you maybe had one too many…
Easter Island Hangover
Meanwhile …. very nice pictures of Asperitas Michael!
And now I am curious about what the ICA would tell as about the circumstances under which Asperitas can or will appear. I haven’t read that much about this question so far. I hope the information will be free accessible from the moment the new atlas will be online. I suppose March 23, 2017?
And also thanks for the links Hygge.
Talking about floccinaucinihilipilification….. (always learning, I must train in using faultlessly this very funny word). What is this talking about aces and newbees? I am neither. I am just an interested amateur and no scientist. But …. as a matter of fact I don’t think it is contrail and can we be so sure it is not floccus? A Flock it is for sure. ImHo it seems to be cirrocumulus which can have a floccus appearance in compliance with ICA. There it starts to be unsure, but …. it also makes a suitable and funny title. Furthermore I can’t see any contrail. A feather that wings its way through the sky ….. does not imply contrail. It does imply well-chosen poetic words to describe something nice. So it is not that straightforward I think, and the most important thing is that I like the kind of cloud structures on these pictures of Keelin. It shows the same situation as on the beautiful picture in the ‘Not B&W’ thread Keelin posted on which also a colorful corona and / or iridescence can be seen. So please no sorry.
I am curious whether these strange shaped contrails – from now on to be called Homogenitus? – will also be included in the new International Cloud Atlas (ICA). I look forward for the announced online publication of the ICA. May I assume that will be per March 23, 2017?
Michael pushed it over the ridge and now this this Dream World Instability is quite a new phenomenon for me. I like it already very much. I enjoyed reading about it, so thanks very much Keelin.
Maybe I push it over the top in my instable dream world when I think I found Over the Ridge the features of a flying bird with a chanterelle. Might this be apohenia gone mad as Hygge once stated in another thread?
Velvet
Gentle and subtle slopes of Asperitas Michael!
Thank you Keelin for your enthusiastic reactions. That is really nice to read. So going on the track of the things we see in clouds like Bowling Balls, a Ball of Yarn, one or more faces, a Slipped Dusk, etc. here is a …
Swimming Goat
A regular walking crescent I would say Keelin. Very special.
I don’t know whether posting this cartoon is allowed, but I couldn’t resist….
….. I thought the restless sea could be Holmboe, but I was not sure. Thanks for confirmation Michael.
Indeed a fascinating phenomenon and a fascinating picture. The large elongated streaks unveil strong winds in contrast with the cloud top left.
Next picture shows another effect of different levels. It is like looking through ground glass to some undulatus.
