thank John, techinal details as expected totaly ignored by IT (ogre)

On 18/12/2010 9:44 PM, John Hall wrote:
b temp can be quite high when there's cold air at the surface.)

There's reasonable agreement in the 12Z 850mb temperatures up to
Christmas Day (though 2 members turn it much warmer for the 23rd and
24th). After that, the lines spread out, though the consensus is that
850mb temps will return to close to the average for this time of year.
The operational run is a mild outlier from the 27th onwards. Prior to
Christmas Tuesday looks like being the wettest and least cold day, at
least in the SE. (The 12Z ECM ensemble 850mb "mittel" chart suggests the
same thing but extends it into Wednesday.) Looks from the GFS graph like
it could be pretty unsettled from about the 26th-31st, after which it
might settle down (but that's a long way out).