Nightfall over the Tejon Pass

Although the stretch of Interstate 5, known as the Grapevine, that connects California's San Joaquin Valley to Los Angeles is a scenic mountain drive, it is usually taken at 65 mph+ and either at the beginning or end of a long car trip, so the scenery is often not appreciated the same way it would be on a 2-lane mountain road.  Approaching the Tejon Pass near Frazier Park, CA as the light disappeared one night, I was struck by the pattern in the clouds over the mountains of Angeles National Forest.