Rainy day birds

It's a typical winter day - rain, gray skies, and gulls congregating on the roof of the auto dealership across the road.  On a good day, there are only a few to be found, with a few crows as well.  But on a day like this, they flock here and all sit down, for some reason facing southwest.  I try to catch them in flight, but I'm not quick enough.  The Extra is my best shot at catching them on the wing.