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No clouds that I can offer from New York. It’s 9F/-13C and the wind is blowing at 20 mph under totally blue skies. A seagull seems not to mind.
Here is my first contrail shadow. Looks like someone used an eraser to remove the white off a blue sheet.
Keelin, what you see there is a contrail shadow. Here is the atoptics explanation:
https://www.atoptics.co.uk/atoptics/contr2.htm
I was very puzzled when I saw one the first time a couple of years back. Since then I got more familiar with them, They are not uncommon. Below is one of mine crossing a halo. The observation angle is such that the shadow is really close to the contrail.
As for the anti-contrail, I came up with the name because I wasn’t sure what it was. It could be a contrail shadow. Or it could be something similar to the cavum or “cloud punch”, the track of an airplane where supercooled droplets froze and precipitated. Problem is that I don’t see the precip, so I incline towards shadow, but looking for other opinions.
Wonderful pictures from everybody.
I started using time lapse last spring when I discovered how easy it is to use with an iPhone. I suppose other phones have the feature. All you need is a way to put the phone on a tripod (I can tell you what I use) and patience. I take my best guess as to where the action will be, start the recording and let it run for 15-20 minutes. Of course, you never know how things will unfold, so inspiration and persistence are essential.
Trying to give people a nudge to try. Just a little while ago this morning (not my greatest, but to give you an idea) …
An earlier post giving pointers on the difference between iridescence and circumhorizon arc, though it can apply to other cases:
I love the moon seen through branches. I have one like this too, though mostly accidental. I wanted to shoot the moon as it was setting (not long after the sun – you can still see the glow) but by the time I got everything ready, it almost disappeared behind the tree.
A little treat like this makes your day. Not iridescence, for sure, the colors are organized like in a rainbow. But not convinced it is a sun dog either. Again, where was the sun (and the Earth). But in the end, does it matter?
It’s hard to keep up with you folks. Beautiful shots and great commentary. Here my small contribution, cavum at sunset.
By the way, happy solstice!
Let me try for six. There are at least five contrails at different stages. And there there is a sixth u-shaped cloud. I cannot think of anything on that sky that would not be the result of a contrail. But you be the judge …
