Bright noctilucent clouds

The landscape was illuminated by the noctilucent clouds over the city at Milton Keynes that remained low in the sky between northwest and northeast.

At midnight, Noctilucent clouds are thin, wispy clouds that glow with a silvery hue at night when illuminated by sunlight from below the horizon – see diagram below.

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How to sign Noctilucent clouds (NGLs) in BSL?


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