Skies like this may be foriegn to most of you but to us it is quite familiar. It is a chinook arch and it brings with the very warm, and very blustery warm winds coming off the mountains. In the winter it can warm the temperature by up to 20 degrees within a couple of hours when it is blowing at it's finest. It can be extremely windy for days. And I mean extremely. But it helps us get through the cold winters by giving us some breaks in the frigid cold and snow. The arch is always to the west and the clouds always stretch over top of the city and spread way to the east.
(Sorry it's a bit blurry, I took it while driving down a very busy main road with my cell phone).