every day.
Nacreous clouds are very high, 9-16 miles (15 – 25 km) in the stratosphere. They catch sunlight long before ground level sunrise and after sunset to glow eerily with unbelievably bright electric colours. They twist, stretch and curl majestically as lower dark tropospheric clouds hurry beneath.
these beauties were glowing over the flatirons on a drive home from work. there’ve actually been several days of these lately. it’s the season for atmospheric optics…
what beauty!