After delayed start, magnificent noctilucent clouds are back in full effect

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Following a delayed start to the northern hemisphere’s 2017 Noctilucent clouds season, the magnificent, electric-blue clouds are now back in full effect.

Noctilucent, or night-shining, clouds are a seasonal phenomenon, occurring most often in late spring and summer. They are composed of tiny cristals of water up to 100 nm in diameter and are formed at a height of about 85 km (54 miles), higher than any other clouds. In the northern hemisphere, the best time to observe them would be during local summer, between mid-May and the end of August. 

This year, they were briefly spotted late May over Denmark, Germany and UK, but that’s when something happened and they mysteriously disappeared.

TO BE CONTINUED ON

https://watchers.news/2017/07/04/2017-noctilucent-clouds-season-late-start/

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