as @Mr Frost said it is a tricky one tomorrow, looks like the kind of setup where wintry surprises happen with front(s) and almost a small developing low moving into colder air A couple of issues from my POV looking at the short range models, 850 temps for the majority look to be around -2 (although possibly an area of around -4/5 moving into the south of Scotland through tomorrow afternoon) really the minimum for snow chances would be around -5, Dew points may just be acceptable around 1 C for the majority although higher towards the west coast (will discuss that in a minute) but again most favourable area looks to be south Scotland later in the day with DP's of around -2, third issue is the infamous mild sector which depends on how much the pressure lowers from the Atlantic which I have highlighted in the image below this would be my watch area for snow but the issue is models show lack of precip when the more favourbale conditions develop in the afternoon so certainly on the lower end of the risk scale due to the precip timing issue, will keep an eye on the models later and see if any changes.