Noctilucent clood

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Noctilucent clood
Helkivad ööpilved Kuresoo kohal.jpg
Noctilucent clouds ower Kuresoo bog,
Viljandimaa, Estonie
Altitude76,000 tae 85,000 m
(250,000 tae 280,000 ft)
Precipitation clood?No

Noctilucent cloods are tenuous clood-lik phenomena that are the "ragged edge" o a much brichter an pervasive polar clood layer cried polar mesospheric cloods in the upper atmosphere, veesible in a deep twilicht.