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Noctilucent clouds over Hoogeveen, the Netherlands, by A.J. Hidding
(originally posted by The Cloud Appreciation Society) |
June 1st is not only the start of hurricane season, but it is also the start of Noctilucent Cloud Season in the Northern Hemisphere. Meaning ‘night-shining’ in Latin, noctilucent clouds are only visible after dark, when they shine out against the night sky as eerie, bluish ripples. They are visible primarily in the higher latitudes, between 50˚ and 70˚ from the equator. Although this is north of Amherst (and the entire U.S. for that matter), look for them if you are vacationing this summer in Canada or other northern climes (U.K, Europe, China, Mongolia, etc.).
At altitudes of around 50 miles, these are by far the highest clouds in the sky, forming in a very cold and dry region of our atmosphere, the mesosphere. Being so high up, they still catch the light long after the sun has dipped below the horizon and the lower atmosphere is in shadow. Look for these clouds during summer in the hours after sunset and before sunrise, when the lower sky is clear.
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