Noctilucent
Clouds continue to be visible nightly over Europe.
Eva Seidenfaden, Paraselene optics
site, saw these NLCs before
dawn on 4th July at Trier, southern Germany.
Shining in the high altitude sunlight they were bright enough to remain
visible against the pre-dawn sky and the town lights.
Lower tropospheric clouds (inset image) remain dark.
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