A Cold mass of air is currently in place in the UK. During Tuesday evening, Atlantic moisture will try and displace the cold air mass (which will bring us a harsh, widespread frost on Monday night), and as it does so it could bring a period of significant snow, primarily to hills across North East UK.
Here is a chart from our system showing the potential areas affected by the Snow. As you can see, Northern areas on higher ground are most likely to be affected, however a few flakes are possible to lower levels in the North:
2-5cm of snow could fall widely across high ground stretching from the West Highlands of Scotland, through the Southern Uplands, into Durham and as far South as the Staffordshire moorlands.
Across Western areas, the snow is more likely to fall as rain or sleet across low levels, the same can be said for the South.
However the further North East you are, areas such as Eastern Scotland and Durham could see a spell of falling snow on Wednesday morning for a time.
Snow in the UK is notoriously difficult to predict and the margin between wintry weather and a wet squib is usually extremely fine in the UK, therefore accuracy is limited, however we usually have a good idea about the areas at highest risk. Central Scotland, Southern Scotland, Northern England (especially the Pennines, Yorkshire and Northumberland), have a chance of waking upto wintry scenes on Wednesday morning. Higher level routes are likely to be impacted by this so take care if you travel over the Pennines on Wednesday morning, or the Scottish High ground.
The further West you are, so for Wales, Western Scotland, North Midlands and North West England, the more likely this snow is to be mainly confined to high ground, hillier areas. However for a time the snow could fall and settle across North Eastern England, parts of Lowland Scotland could also see a few flakes, however here it is unlikely to cause much in the way of travel disruption.
There are a few slight chances in the forecast that will ultimately alter exact areas predicted to be affected by the snowfall, however slight chances will allow snow to fall to lower levels as far South as the North Midlands, of course, this is a small risk however needs to be monitored.