I shot this with the B&W option on my EOS 20D, maximum file size for best detail. I opted to use the "red" filter option to darken the sky to increase the contrast with the clouds and snow details on the distant peak. That filter option made the green of the plants in the foreground darker in tone as well to further accentuate the bright white of the clouds and the snow.
This image is show on CA Highway 39 near where it is blocked off with barricades along the West Fork of the San Gabriel River. Aside from the stunning mountain views, this stretch of road is one of my favorites to just get in a car and "drive" and enjoy the twisties.