Once saw a front come through like that duck hunting one January morning when I was in highschool. It was about 70 degrees and storming when we went out there that morning. The storms moved through and about 8 that morning we could see it coming like a huge floating wall. There were huge groups of ducks riding the wind in front of it. The wind went from howling out of the south to calm to howling out of the north in about 10 minutes. Temp went from 70 to 45 in about 45 minutes. Pretty awesome site and I wish I had a video camera.