GFS much like yesterday until Tue 12th i.e HP declining to westerly flow, even NW around 9th; then a deep and cold LP with northerlies 12th - 14th (wasn't shown until 14th at this time yesterday but models steadily moving it earlier since - a worry for election organisers) going back to W/SW flow by 18th
After propping up a HP cell, UK Jetstream resuming generally strong W - E from Thu, first to the N of UK but sinking southwards. Notable loop S-wards 12th/13th allowing cold LP to follow in its wake, then back to W - E the following week.
ECM matches GFS to end of TWO charts at T+240 (Tue 11th) and the last chart has an LP positioned to come south much as GFS
Ens temps oscillate between seasonal average and above to about 8th Dec, the a long period where most but not all runs a degree or two below. Variable amount of pptn 7th onward; snow row totals only significant for N England and Scotland
Originally Posted by: DEW