This evening around sunset there was some odd-looking cirrus. The
oddity was that the curvature seemed to be in the vertical plane, not
horizontal. I observed it over a period of 30 minutes from positions
about 1km apart (home to get camera and out again to find a fairly clear
horizon) and that impression persisted. Location East Cambridgeshire.

https://www.flickr.com/photos/54731504@N04/31405011106


The whole scene reminded me of the visiting our open-hearth steelworks
in Glasgow when I was an apprentice. Rivers of molten steel would run
in channels across the floor!


Any help with this would be appreciated.


Mike