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poz, April 29, 2018 in Meteorology
This remained for 3 hours.
Possible: Vapour trails from different planes passing in the same airspace drifting with the wind.. (Major airway?)
That would be my assumption also. We used to get many criss-crossed patterns in central France that could remain for a long time if the weather was calm.
I can't explain it, but this might be a clue:https://en.wikipedia.org/wiki/Orographic_lifthttps://en.wikipedia.org/wiki/Wave_cloudhttps://en.wikipedia.org/wiki/Lee_wavehttps://en.wikipedia.org/wiki/Morning_Glory_cloud
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