Interesting looking at the MetO ensemble output today (not publicly
available) and the 12Z runs. Deep and stubborn very cold air over Greenland
continues to leak south reinforcing the jet and low-level baroclinic zone
maintaining the cold westerly type with a north-south gradient in
temperature. Already sleet has reached high ground in the SW with snow in
Wales. Over the next few days it looks like we will get some milder
interludes in the south as deep lows spin up in mid-Atlantic and buckle the
flow. Also the baroclinicity sinks south putting the UK bang in the firing
line for some rapid deepeners later on with cold air entrained, which will
be quite exciting! Only a small chance now of high pressure establishing
over UK or near continent. The picture is one of continuing cold zonality
with increased high potential vorticity (energy) in the flow.

http://www.lyneside.demon.co.uk/Hayt...antage_Pro.htm
Will Hand (Haytor, Devon, 1017 feet asl)
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