I know I got some knowledge about the GFS take on things right now.
Scotland, Ireland Esp. N. Ireland NW and N England and Scotland have a 40 percent chance of a decent spell of Snow.
While South of the Birmingham and Leicestershire Areas have much lesser chance of Snow at 25 percent.
The Midlands also could get a chance: 35 percent chance there.
Birmingham and Leicestershire have 35 percent chance.
South of the M4 has a 15 percent chance of snow based on Today's 18z GFS Model Run.
It appears A cold NNW flow with Active Cold Front and SE Tracking Iceland to UK Low Pressure is currently suggested.
The above forecast is liable to significant changes in Location, Depth and Track of that Low Pressure system, which may lead to High Pressure by Wednesday Xmas day- A Cold and Settled day if the High over Central N Atlantic follows the SE diving Icelandic Low on 23 and 24th December 2013.
This is possible- give the reliable GFS, by the way this right now is Progged at 348 to 384 hours Am I right?.
Climate is warming up, Scotland and N Ireland and North England still often gets some Winter frost, ice and snow, November to March, but the SE and South UK including S Central England and Wales, together with the West and North through the year, they sometimes get more rain than London and S SE England, where some longer dry fine spells without much heavy rain is seen every year.
The North Atlantic Sea often gets some much Colder Wintry conditions from November to March Months, and Mild SW and South winds tend to be more frequent over the East and SE of North Atlantic Sea, as the Azores High tends to stay in charge.
With this warmth and heat, the Central and South UK has become mostly free of snow and frost.