I've seen both blue and white used to indicate snow on various channels. I suppose it's just what you're used to.
That said, I prefer snow to be indicated by white, and I prefer the land on weather maps to not be white.
P.S.: I remember the days before radar could even show snow. We had to make do with blotchy green and the meteorologist in front of the map explaining that this was snow, and we had to take his word for it!