Noctilucent Cloud Morphology

VEIL – a simple structureless sheet, sometimes as a background to other forms.V
BANDS – lines or streaks sometimes parallel or crossing at small angles, not particularly organised.
WAVES – sometimes called BILLOWS. Fine herring-bone structure like the sand ripples on a beach at low tide. Very characteristic of NLC.
WHIRLS largescale looped or twisted structures.

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