Tuesday, July 19, 2005
"Nacreous Clouds are clouds in the winter polar stratosphere at altitudes
of 15-25 km. They are implicated in the formation of ozone holes".
That's the scientific definition. These only form in polar regions and
are very similar to rainbows, only without the rain. Ice crystals form
and light reflects off of them to form vibrant pastel colors. Usually this
happens in the spring, but last winter we had them in mid-July with the
full moon providing the light. It was a pretty rare experience, viewing
them in the dark. I'm glad I had an chance to see it happen.
Posted by Tom Hamann at 3:18 AM