On Dec 3, 10:12*am, "Eskimo Will" wrote:
I was discussing this at work earlier this week with a Chief forecaster. It
has been pretty persistent for a few weeks now, never moving. It's almost as
if the progressive Rossby pattern (still spot on Len!) has cut off that part
of the Arctic leaving it to cool and cool .. Seas just to the east of
Greenland are now cold and this reservoir of deep cold air is like a tap
opening up and flooding south to re-inforce the Atlantic baroclinicity in
the cold westerly, preventing blocking further east. Over time the colder
air has come further south and now Scotland is set to turn very cold, though
still with milder interludes in the mobility. The big question is will a
mid-Atlantic ridge amplify due to upstream trough extension over Canada. All
eyes to the Pacific I guess. So it seems for the time being at least we are
looking at cold mobility with lots of fascinating wintry detail to get hold
of, especially, but not exclusively in northern areas!

Ciao, winter weather watchers :-)

Will
--

Oh no! The first of the; "if only we could tap into the cold to
our......" posts of the winter. *)) There's always cold in the Arctic/
over Asia/over Greenland in December. Oddly, it is there every year at
this time - and its always only 2000 miles (ish) away. Sometimes we
"tap into it" - as per this time last year. Most times it sits there,
being tantalising and driving the people mad who constantly hope for
the "floodgate" to open. The rest of us ignore it, until it actually
looks like it might! *))

Actually, the big queston is really whether the high pressure which is
presently to our SW will migrate eastwards and settle over Europe to
give us the mild Christmas that many are hoping for, so they can
travel easily to see family and friends (no English lowland snow over
the weekend of the 16-18th, please), or jet off to the sun (I wish!)
without airports being closed.