On Tuesday, 24 December 2013 18:50:05 UTC, John Hall wrote:
In article ,

"Keith (Southend)G" writes:

http://www.wetterzentrale.de/pics/Rtavn3841.png



Usually you get successive runs at T+384 from the GFS that show all

sorts of variations, but for a week or two now it's been stuck in a

zonal rut even that far out. This is the first variation from that.

Significant? Probably not, but one can hope.

What I have there is a significant anticyclone blocking the western half of the North Atlantic and a not all that significant but large Icelandic Low not so Icelandic though.