I'm really surprised they didn't ask for volunteers to clear the snow off the pitch. I suspect the pitch itself is playable - currently around +3 here in Leeds and snow is melting off rooftops and car roofs outside our house.
Tweeting pictures of snowbound pitch all morning seems like they'd already made their mind up that the game was going to be off - which is odd because that's their big payday gone (given that it will likely have to be midweek for the re-arranged game)