One thing we discovered quickly in the Canadian Rockies (and Glacier, as well) is that you can't count on a weather forecast. Early in our trip, one of the waiters told us that "if you don't like the weather going out the front door, go out the back." Not far from true! These photos were taken within minutes of one another--one out the front window of our car, looking east and the other in the side view mirror, looking back to the west.
East and West
Front and Back
Stormy and Clear
You can find more interesting Pairs at Helena's blog.