Another breath taking run from the GFS. It is similar to the 12z up until monday when it will be mainly dry but very cold in the SE. To cut a long story short it keeps the cold right out to Christmas with a return North Easterly for the new year. This would be a cold spell to tell your grand children about, if this run came off put it that way. I know I put the cat amoungst the pidgeons earlier by playing this down against last febs snowfall. What I will say is although i dont believe the snow will be as deep, I do think that all areas will see at least 2" and it wont be as local this time. 18z shows snow cover for the whole of the uk on christmas day! Expect the precipitation to be 3hrs later than expected. It will hit North Cambs and Beds at 8am, South Herts / Essex around 11am south of a line from Dartford to west end by 3pm Night all!