So the 12Z GFS it is Varying from A Colder Setup By Deep UK Low Pressure 26th to the 29th, and Again late on the 30th, but more importantly the t192 Friday into Saturday 31 Jan.,to Feb. 01 2014.
Sunday Windy with Band of Heavy rain West SW winds, Veering Westerly to NW p.m with lots of Scattered Heavy Squally Wintry Showers This affects us, even a.m. To Midday Monday Very Cold with the same, p.m., Less cold in South and SW UK as Next area of Cut off Low dives ESE and Tuesday again right through to Wednesday we see Two Low's NW and West NW UK and Southern Mid UK, all areas Cold with plenty of Heavy rain and sleet hail and Snow Showers, Cyclonic winds- SW or NW or SE and some See NE flow, the Thursday a Quite Cold dry weather with frost early and late.
By Friday and Saturday UK see Some rain with band of heavy Snow and sleet, Cold NW winds move SE wards.
To NE Atlantic Arctic High linked with North to E NE Central Europe High, and NE East Central Greenland has Blocking High.
West Central N Atlantic High large Cold Ridges extend towards into S Central Greenland, Blocked Low Pressure Areas Newfoundland and E SE Canada at times Head SE undercut Greenland High, and Deepen linked Low Monday and Tuesday across UK, very cold Airmass advected from Newfoundland and SE Greenland Which is pushed SE- with Another Cold Plunge to UK from this late on 30th, and on 31 and 1st Feb. that is potentially to extend the Cold Spell.
Those Cold Low's affect South Central Europe during the Same period, with many areas cold with spells of Sleet or Snow this helps keep the Siberian and Scandy Arctic High Stick Around so as well Greenland at 1035 - 1045 hPa.
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.