Here is a summary of the NWP output for noon on Monday.
Issued 0532, 24th Jan 2008

The middle of the working week will see a north/south divide, with high
pressure close to southern areass keeping things largely dry. Northern areas
will see more in the way of wind and rain, but temperatures across the UK
are likely to be on the mild side. This time next week there are signs of
much colder weather spreading from the NW across the UK, but there's still
considerable uncertainty about the specifics.

Analysis and evolution to T+120 via GFS
http://85.214.49.20/pics/Rtavn001.png
SW'lies and WSW'lies cover the UK, with a trough approaching from the west.
High pressure builds to the south tomorrow, leading to SW'lies for all, near
gale force in the north. There are WSW'lies on Saturday as the high moves
eastwards, followed by further WSW'lies on Sunday.

T+120 synopsis
http://85.214.49.20/pics/Rtavn12015.png /
http://85.214.49.20/pics/Rtavn1201.png
http://85.214.49.20/pics/Rukm1201.gif
http://85.214.49.20/pics/Recm1201.gif /
http://www.meteociel.fr/modeles/nogapse_cartes.php
The jetstream chart shows the UK under a large ridge, with a strong jet
running NE'wards to the west of the UK. At the 500hPa level there are upper
WSW'lies, with high pressure over Iberia. MetO has upper SW'lies instead,
with a trough to the west and a ridge to the east. ECM shows an upper ridge
over the North Sea, while NGP is closer to MetI, showing upper SW'lies with
the UK between a ridge to the east and a trough to the west. GEM brings
upper SW'lies too, this time with the upper high over France.
At the surface GFS brings SW'lies for all, with a trough to the west and a
high over France. MetO shows southerlies and SSW'lies, also with a trough to
the west. ECM has a trough much further west, with a weak ridge and WSW'lies
over the UK. NGP is more progressive and has a trough over Ireland. Ahead of
the trough winds are SSW'lies, with WSW'lies following behind. GEM shows
SW'leis for all, with high pressure over France and a weak trough to the
west.

Evolution to T+168
ECM shows SW'lies for all on day 6 as a trough approaches from the west. The
trough dissipates on day 7, with the UK under WSW'lies.
A trough moves SE'wards on day 6 with GFS, introducing cooler westerlies in
its wake. On day 7 low pressure deepens to the north, bringing SW'lies and
WSW'lies to the UK.

Looking further afield
By day 8 ECM shows a trough moving SE'wards, with SW'lies in advance and
colder NW'lies following behind. A ridge "topples" over the UK on day 9,
leading to WNW'lies and westerlies, followed by strong to gale force
WSW'lies on day 10 as low pressure deepens explosively near Iceland.
Low pressure deepens over the North Sea on day 8 with GFS and an associated
trough moves southwards over the UK. Ahead of the trough winds are
westerlies, with NW'lies following behind. Day 9 shows NW'lies and WNW'lies
over the UK, as low pressure deepens and moves eastwards. On day 10 a ridge
builds to the NW, leading to NE'lies and northerlies over the UK.

Ensemble analysis
(http://91.121.94.83/modeles/gens/gra...ille=Lond res)
The ensembles show a generally mild outlook until the turn of the month,
whereupon things turn notably cooler.