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From this article on CAS (new to me) the picture of Carolyn Byrne appeared in The Times, UK, 26JUL2019
George, that’s a champion suggestion; and congratulations to Simona Halep from Constanza, Romania’s first Wimbledon champion.
You ask the right questions, Based on my guru (Clouds and Weather, R.K. Pilsbury) wave clouds occur when 1) There was an inversion of temperature with height 2) Wind direction was fairly constant with height 3) Wind speed increased with height 4) Wind speed at 2.000 feet was at least 20 knots.
There can be a train of waves (not here). The stack is stationary; it can be set up by (even a low) ridge of hills (but not an isolated hill), and some way away (15 miles in one example).
One questions whether there might be a ridge of hills to the right causing the stack, with wind blowing right to left. There can be a roll cloud below the lowest lenticular (turbulence), possible here perhaps.
[Needed F5 again]
A different vista from Hillier Gardens, Centennial Border looking roughly NW
Father of Bossa Nova – Chega de Saudade 1958
Towards the end of Paul Simons’ column above he mentions a stunning time-lapse video by Ben Pickering in Leeds, UK:
The last para says ‘….but wearing polarised sunglasses helps to reveal them.’
I think it was Michael who said always look behind you.
N.B. I am having to use F5 in Windows 10 several times this evening to stay logged in.
(The Times, UK, must be blushing at the lower case ‘h’ in Hows in their title; I guess there are no sub-editors to correct such typos these days and Google algorithms are not yet up to it. Are your fingers crossed for AI, I wonder.)
Hans, turning to the 1JUN2019 calendar page I see you have a vista too from a nearby field*. Everyone should have one, but especially Clouspotters – it is uplifting. For once I have observed something similar to a Forum image – undulatus was the trigger for my joining CAS; for twice I was at Hillier Gardens but had forgotten to take the camera.
* Your picture link is in this post but does not seem to be displayed by CAS.
Marriott seems to have many such pictures at Heacham, an east coast resort that looks west says the caption beneath a different picture in The Times, UK, 27MAY2019.
F5 in Windows 10 needed again. If you mean that linear feature just above the lights, Hans, I don’t find that strange – saw something similar late afternoon today, interesting but not remarkable.
Impressive asperitas and noctilucent.