Ozone Hole creating a Polar Stratospheric Cloud PSC - Nacreous Cloud
Nacreous clouds, sometimes called mother-of-pearl clouds, are rare but once seen are never forgotten. They are mostly visible within two hours after sunset or b...
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Nacreous clouds, sometimes called mother-of-pearl clouds, are rare but once seen are never forgotten. They are mostly visible within two hours after sunset or before dawn when they blaze unbelievably bright with vivid and slowly shifting iridescent colours. They are filmy sheets slowly curling and uncurling, stretching and contracting in the semi-dark sky. Compared with dark scudding low altitude clouds that might be present, nacreous clouds stand majestically in almost the same place - an indicator of their great height.
They need the very frigid regions of the lower stratosphere some 15 - 25 km (9 -16 mile) high and well above tropospheric clouds. They are so bright after sunset and before dawn because at those heights they are still sunlit.
They are seen mostly during winter at high latitudes like Scandinavia, Iceland, Alaska and Northern Canada. Sometimes, however, they occur as far south as England. They can be less rare downwind of mountain ranges. Elsewhere their appearance is often associated with severe tropospheric winds and storms.
http://www.atoptics.co.uk/highsky/nacr1.htm
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They need the very frigid regions of the lower stratosphere some 15 - 25 km (9 -16 mile) high and well above tropospheric clouds. They are so bright after sunset and before dawn because at those heights they are still sunlit.
They are seen mostly during winter at high latitudes like Scandinavia, Iceland, Alaska and Northern Canada. Sometimes, however, they occur as far south as England. They can be less rare downwind of mountain ranges. Elsewhere their appearance is often associated with severe tropospheric winds and storms.
http://www.atoptics.co.uk/highsky/nacr1.htm
Read less
Feb, 2016Views
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DublinEnemyNo1
July 08, 2016
Thank you all for 1111 Views & 1 Comment
Dublin Enemy No 1 LOVES that !!!
Dublin Enemy No 1 LOVES that !!!
b_k_ashworth
August 17, 2019
I have pictures of the same cloud from Bangor, Co Down. That shows how high it was! They normally form around 80,000ft or so. The cloud had a slightly different shape above us, but absolutely the same.
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