Every clear night I hope to see these wonderful clouds seen only during the short summer weeks. At 60 degrees north the sky is too bright in June, so if they are present they are only vaguely visible.
In July the sky has darkened sufficiently for these super high clouds to really stand out and prolong the twilight. Even though this July has been astonishingly clear and sunny, there has been very few displays, until tonight.
Hopefully more will come, and hopefully one that covers the sky all the way to zenith.
Last updated on 29 December 2020
