You can expect snow at any time out of nowhere in this setup. There are lots of heavyish showers bubbling-up over Wales but a lot are fizzling out over the higher ground and not making it here but some will get through. It's just a case of lamppost watching. As for Sunday, yes, there is a good chance of some more significant snowfall but its not nailed on. Won't really know for sure until a couple of hours in advance.