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I read nice thoughts about rareness, but I like to add another aspect of the rareness of a cloud, i.e. the way the observed cloud or phenomenon appears. There can and will be very spectacular appearances of a rather common one that makes it a very rare occasion. Just check the gallery and you will find a lot of rare occasions of what might be called common clouds. You will whoop with joy Samuel, so welcome to you!
I do recognize the problem with signing in Michael. I have found that signing in and then immediately a refresh of the page will help. Just try. Another thing is that being not signed in the links to the gallery and the forum show the status of the site some 5 days (or now already maybe more) older. The team knows about it, so I hope they can solve it.
A horseshoe is indeed a weirdo the way you describe their coming and going Michael, very visual. I just once saw a horseshoe close enough. I took the picture quickly with the cloudspotter app (the phone is by hand) and after getting my camera it was gone with the winds. So no observations of the way it developed. Nevertheless. This one was very thin and rectangular.
Brains back, haha. I missed the joke the first time I saw your post Keelin.
Beautiful bouquet Michael!
A lot going on on your picture George. The contrail shows indeed Crow instability effects. I do see a lot of contrail where I am living, so this is sometimes observed, but to see it in its most characteristic appearance it needs the right conditions. This is something else I spotted last week.
A moonscape
And some place further in the sky:
Holy cow. Holes were eating up the altocumulus.
Has anyone seen something like this before?
Ah, brain teasing it was. Many thanks Gavin and others for solving !
Another contrail with Crow instability giving something like a zipper
Well thank you too Keelin. As a matter of fact I do the same. If there is something new it is fun finding out more about it.
And OOPS that is not your brain to blaim. I do think something is wrong with the upload function. From what I experience today is that the forum seems to be under construction. I already tried earlier to post a picture, but did not succeed. I wait untill it is solved…
To my surprise today a picture is added to the gallery of Mike Davies on which contrail with effects of the V.C.I vortex Crow instability. Yesterday I just found information of the Crow instability in contrails because of my search for information about the Holmboe instability (triggered by the ‘Dawn Asperitas’ topic). I also concluded that the two pictures I added to this thread with titles ‘Barbed wire’ and ‘Under Water Or In Space?’ are examples of the same Crow instability. Here is a third one from the same series
Another nice thing to know is that on the picture named ‘Under Water Or In Space?’ you can see the original contrail and a secondary so-called hybrid contrail separated clearly. The secondary contrail appears to be heavier (and therefore also brighter) having larger ice particles that fall faster and so show as two. This is also visible in the picture above. This one was taken earlier so the distance between the two type of contrails is not that big yet.
Sorry I tried several times to post something on this subject, but it does not seem to work. Can’t delete this thing.
Many thanks Michael. Again you posted a great picture of the phenomenon.
I am a bit proud now of my black and white impression (although in fact in color) being aware that this was the only time I saw it without knowing what phenomenon I saw. These shapes really fascinate me. They are truly photogenic.
I googled some time ago to find a lot of information about it, … and googling again at the very moment of writing this post I find a link to what appears to be a former forum topic in which I find to my surprise that at that time you already posted a lot of pictures and information about the phenomenon. I remember now having read it before with great interest.
Really fascinating pictures you posted, Michael. Love them!
Thank you Michael for your extensive explanation and the beautiful example you added of Holmboe instability. Great picture. Surreality is everywhere in reality.
How different circumstances can be. I can’t complain about the frequency of fog (i.e. a lot) over here. Our weather is dominated by the presence of the North Sea. So a mild kind of weather results, neither cold nor hot, and lots of clouds. The price of this? Often water on our heads.
I remember looking for the Holmboe phenomenon some time ago when I found your post on the gallery (April, 18 2016). I started a topic Eruption and posted a picture that would fit nicely in the ‘Black and White Thread’. It shows an eruption-like cloud structure in all kinds of grey. In retrospect I now suppose it might have been Holmboe instability. In that case it was my first spotting of the phenomenon (and until now the last). What do you think?
You are lucky Michael, with so much Asperitas events. I counted 1 last year (more or less) and a handful occasions in 2015. Every occasion special although maybe not that specific for spectacular views. In every occasion strange waves and curves in the clouds. I look forward to a new occasion this year.
So I say: keep listening to the whisper of it. I love those large wavy arcs over a landscape you captured.
By the way: I am curious for your pictures of the Holmboe Phenomena. I know you posted one picture of Lenticularis with the Holmboe phenomenon some time ago on the gallery. It caught my eye and got interested so I searched for information about the phenomenon. I hope once to spot it myself. There is so much to enjoy in the sky.
Well, this must have been a good morning for you, Michael. These pics are certainly worth sharing. As a matter of fact I like the last one best. It are the large curving structures over the dim landscape that appeal to me.
