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Hello Marie, that is an amazing sky. Your first picture shows a great arcus. What’s puzzling me are the mamma features. Mamma usually appears at the back of a storm cloud while the arcus is always the front of a storm cloud. Maybe there is someone else who can shine alight on this?
Your second one may looks a bit like asperitas but I don’t think it is. I think we see the turbulent bottom of a storm cloud above.
Both photos are very impressive. Love them.
Hans
Great variation in your color ones, Michael. Pileus, towering ones and then delicate veils. Love it.
On The Move
Keelin the halo you posted some time ago shows indeed a part of the circumscribed halo. Great one! And I love your Flirty Halo. Unresistable!
Great rainbow Ruth. The colors melt with their surroundings.
I love your surprising Yellyfish Keelin. It is so funny that Ruth found Billy and he is even playing with one of your pups Keelin. I love the funny looking hungry fellow by Robert too. So much fun in this thread!
You might think next one belongs in the thread for optical phenomena, but it might be as well a very different phenomenon.
Caspar The Friendly Ghost
Fluctus is the official name according to the ICA for a Kelvin Helmholtz cloud. Their classical and most obvious appearance is in a row, but they can certainly be seen solo. Here is an example of a solitary wave on the gallery: Solitary KH wave.
So both images by Flynn show fluctus in my opinion.
Hello Don, as you already suspected the mentioned gravity waves in the CAD of the 26th of May are not the kind of gravity waves Albert Einstein once predicted to exist and indeed can be caused by a supernova. That’s a very different league so to speak.
In next link you will find a good explanation of the gravity waves related to clouds with some examples. I hope you like it.
Hans
Great pileus series Michael. Such thin veils played by the winds around cumulus. Her we had yesterday a display of a lot of pileus. Because it is more rare over here it was discussed in the daily weather report. Very nice.
Here is one with two identified flying objects in it.
Cover Up
Cottage Chees by Ruth, a duplicatus and a great composition with a black hole by Michael. Always surprises in this wonderful thread.
Pilayers
Hello Tess Nice spottings! Fibratus and undulatus are often difficult to distinguish. The difference between the two is that undulatus has its wave pattern perpendicular to the wind, while fibratus has its streaks in the direction of the wind. This is not yet very helpful because we can’t see the direction of the wind, but we still can see the texture of the clouds. And in this case I think we see undulatus, because of the smooth rounded forms the lines have. Fibratus would have a more streaky cirrus-like signature.
Greetings,
Hans
Thanks Ruth. Early and Late might not be applicable as a title to next one, but …
One’s Burning His Trail
Robert, what an impressive lenticular cloud with a hint of sunset. Love it.
Love the play of light in your “Light behind the clouds” too, Ruth.
Stormcloud
Michael, above are some fantastic delicate examples of pileus. Love them. You also posted in the part of the forum for Cloud Identification Help some great images of developing sheets of stratus accompanied by your explanation of what’s happening. Very instructive and interesting.
Developing
Yes that’s Crow Vortex Instability (CVI) you spotted, Ruth. Very nice. I love to spot them but – as you say – they are very short lived.
Your twisted ribbon has certainly some marvelous bonuses, Robert. An impressive scenery.
The ribbon reminded me of a twisted contrail I spotted some years ago.
Spiral Staircase
