Nacreous Clouds

Today’s rare guest in Oslo sky is the nacreous cloud. It forms when the fading light at sunset passes through tiny ice crystals blown along by a strong jet of stratospheric air. The clouds form only in polar latitudes and at extremely cold temperatures below −78 °C at altitudes of 15,000–25,000 meters.

Share in:
"(NOT) an ordinary" Nazi
Trotsky in Norway
Long road to Hurum
The human destiny in four lines
Free Lecture: Unknown war. Norway during 1940-45
Historical toilets in Oslo