Look west 30 to 60 minutes after sunset when the Sun has dipped 6o to 16o below the horizon. If you see luminous blue-white tendrils spreading across the sky, you’ve probably spotted a noctilucent cloud. Although noctilucent clouds appear most often at high latitudes–e.g. places like Scandinavia and Canada–they have been sighted as far south as Colorado, Utah and Virginia.

Related posts:

1. Those Clouds
2. Castle In The Sky
3. I Hear Them Bells A’Ringin’