Noctilucent clouds are a weather phenomenon unique to summer months at latitudes between 50 and 70 degrees north and south of the equator. Inhabiting the mesosphere at altitudes of 75-86 kilometers, science regards noctilucent as highest clouds in Earth’s atmosphere. Too faint to be seen in daylight, there’s good reason why they’re known as luminous or night shining clouds. Noctilucent clouds can only be illuminated by sunlight below the horizon at astronomical twilight when lower levels of the atmosphere are in Earth’s shadow. Learn more at – https://www.almanac.com/news/weather-news/it-came-outer-space
For immediate noctilucent gratification, ponder noctilucent perfection by Adrien Mauduit of Night Lights Films –
In 2004 Gavin Pretor-Pinney of the United Kingdom formed CAS, the Cloud Appreciation Society. The following year Yahoo declared their website “the most weird and wonderful find on the internet for 2005”. As of May 2016, the society claims over 40,000 members representing 165 countries.
“We believe that clouds are for dreamers and their contemplation benefits the soul. Indeed, all who consider the shapes they see in them will save money on psychoanalysis bills.” – from the CAS Manifesto, full document at – https://cloudappreciationsociety.org/manifesto/
Membership will set you back around $50 (annual membership plus a one time “sign-up fee”) Sign-up fee covers postage of the CAS member package – a shiny enameled lapel pin, official certificate stating member will “henceforth seek to persuade all who’ll listen of the wonder and beauty of clouds”, and a handy pocket cloud selector. Members submit cloud wonders via the CAS app. Every morning a “cloud of the day” image is sent to member mailboxes. Member info at – https://cloudappreciationsociety.org/cas-membership-intro/
Below – November “Cloud Of The Month” photographed by James Tromans over Warwickshire, England.
Four images above – a selection of daily clouds.