Two very different forms of clouds drift along the horizon: a thunderstorm nearby and low, and noctilucent clouds far away and high.
This was the scene last night, as another thunderstorm to the north of me rolled along the horizon drifting away to the east. A bolt of lightning illuminates the storm clouds. The thunderstorm was over central Alberta, and at the bottom of our atmosphere, in the troposphere.
Meanwhile, in the background, a beautiful display of noctilucent clouds crept along the horizon in the other direction, drifting to the west. These clouds were over the Northwest Territories, a thousand or more kilometres away to the north and 80 to 100 kilometres high, at the top of the atmosphere in the mesosphere.
The NLC display lasted all night, or for at least as long as I was able to stay up and shoot.
This is a telephoto lens shot that zooms into the brightest part of the NLC display.
– Alan, June 27, 2013 / © 2013 Alan Dyer