The forecast according to more reputable sources than The Scum newspaper is pretty bad to be fair. Even if it stops snowing by lunchtime, that might not be enough for them not to call it off. There’s snow forecast for tomorrow too and coupled with sub-zero temperatures on Saturday night, that’s going to be a health and safety nightmare if the predicted heavier snowfall occurs on Sunday morning.
Remember they called off the League Cup semi-final first leg at our place in 2010 over 24 hours in advance of the scheduled kick-off because of heavy snow the day before. If Sunday’s forecast is looking increasingly likely tomorrow it wouldn’t surprise me if they called it off as early as tomorrow evening, especially given how many United fans travel from far afield. That said, they will want to give it every chance to go ahead so may delay any decision until Sunday morning.