Post by Oscar van der Velde on Jun 28, 2009 15:47:57 GMT
Where in France did you observe from? I checked the webcam of Pic du Midi only in the morning of June 28, and it showed a possible waving veil or diffuse bands which I also observed here in NE Spain. I can't be sure because there was cirrus during the evening which dissolved. Even for my previous observation I can't be totally sure, the only thing for both observations was that no cirrus appeared to be visible in darkness nor in stronger daylight. It does seem possible that there were very thin layers of moisture at cirrus or strato/altocumulus level which only show up when light passes horizontal through it. I saved some webcam images and took photos.
Post by Oscar van der Velde on Jul 13, 2009 13:10:29 GMT
It is possible that my "possible NLC" and those of Pic du Midi of this date were volcanic dust. During the last few weeks there are often reports from rippled skies around sunset, I have seen examples also from the Netherlands. Last evening (12 July) I saw such ripples again here but finer, and there was no cirrus on satellite. It does not always appear together with a red/purple sky. The ripples can be visible in broader daylight.