This is a polar stratospheric cloud, and it's very, very pretty. It forms high enough to catch the right angle to the evening sun and fill the entire sky with rainbows. It also makes chemical war on the ozone layer. and is attempting to burn us alive.
Stratus Clouds, Greenland (photo by Bryan and Cherry Alexander). Eight hundred miles south of the North Pole, stalactite-like stratus clouds - churned by winds - and the light of a bruised dawn paint an apocalyptic portrait over Inglefield Bay.