It seems that high winds and snow, in the hands of mother nature crafts aerodynamic shrouds that put us to shame:
Snow Mods: Ten Cars Aerodynamically-Enhanced By Mother Nature - Snowpocalypse - Jalopnik
The snow was accumilated and erroded and the most aerodynamic shape found naturally. The result is impressive in the pictures, when I first saw it I thought it had been carved by cheeky ecomodders. So did anyone in that area get out and make a mould or template from those shapes?