Noctilucent Clouds...

[Rick]

The summer solstice is near, and it's prime time for noctilucent clouds, so if the sky should happen to be clear just after sunset, keep your eyes out for them.

[ApophisAstros]

Apparently the best year ever.
https://mailchi.mp/spaceweather/record-setting-noctilucent-clouds?fbclid=IwAR0oF5fPsMeC9cd5OreuqhCQIVjo2C0GMxIe8rp2io_MG_XdLrtpbNjGzP8

Roger

[Rick]

I've seen a few spectacular photos of NLCs this year. One set cropped up on a forum for another interest of min:

https://reflector.sota.org.uk/t/dm-ns-129-noctilucent-clouds/20471

APOD had a fantastic photo of NLCs over Paris:

https://apod.nasa.gov/apod/ap190628.html

[Rick]

It's that time of year again.

Starwatch: Why 'night shine' clouds at edge of space may be product of pollution

Late spring, early summer marks the beginning of noctilucent cloud season in the northern hemisphere. The name derives from Latin, where noctilucent means "night shine". These beautiful cloud formations can often be seen during the summer months shining with an electric blue colour against the darkening western sky about 30 minutes after the sun sets.

The origin of the noctilucent clouds remains mysterious. They are the highest known clouds in Earth's atmosphere, existing at an altitude of about 80km (50 miles), which is virtually the edge of space. They are regarded as being too high and too tenuous to have any effect on the weather at ground level.

More: https://www.theguardian.com/science/2023/may/29/starwatch-why-night-shine-clouds-at-edge-of-space-may-be-product-of-pollution