From storm thread which talked about the complexities of tomorrow's weather:
"Merry Christmas will be really interesting to seem where gets snow tomorrow. Hilly parts of Wales, some of northern England, the midlands perhaps at times and I still think the chilterns. It depends on how heavy the precipitation is, the air it falls through and obviously the temperature. I expect some people will have rather a surprise."
And With regards to discussion about NI: "it's going to sound like a cop out but I just don't know 850hpa temps look borderline as does air temp but if the rain is heavy and falls through dry air as it evaporates it can cool the air down allowing snow to fall. ( evaporative cooling)
Often snow in the UK hangs on a knife edge with a temp swing of one or two degrees making all the difference. It makes it very difficult for councils. Put grit down too early and it gets washed away then it turns to snow and everyone blames the councils for the ensuing chaos."
I don't think things have changed since my thoughts earlier today.