Selective snow

I suspect all of us has seen the phenomenon of it raining on one side of a street but not the other.   I am also sure that  at one time or another we have driven along a road with snow on one side and not the other.  Well, two days ago, I woke up and there was no snow in my front yard. There was no snow in my back yard. But my deck was covered in snow … only the deck. It was a couple of hours later before it occurred to me to take a picture.