Here is a summary of the NWP output for noon on Tuesday.
Issued 0531, 15th January 2009

The middle and end of the week will see a very unsettled spell of weather
across the UK, with widespread gales and rain as a serries of secondary lows
and troughs orbiting a complex low to the NW cross the UK. For much of
England and Wales temperatures will be around or slightly below average
overall (possibly above average in the south), while further north in colder
air some snow is likely at times (as well as over the highest ground of
England and Walws).

Analysis and evolution to T+120 via GFS
Southerlies cover the UK, ahead of a deep low to the west. The southerlies
persist tomorrow and on Saturday. A trough moves eastwards on Sunday,
bringing southerly gales in advance and strong to gale force SW'lies in its
wake.

T+120 synopsis
http://91.121.93.17/pics/Rtavn12014.png /
http://91.121.93.17/pics/Rtavn1201.png
http://91.121.93.17/pics/Rukm1201.gif
http://91.121.93.17/pics/Recm1201.gif /
http://www.meteociel.fr/modeles/nogapse_cartes.php
The jetstream chart shows a strong and zonal jet across the North Atlantic
and western Europe. At the 500hPa level there's a trough over the UK, with a
deep upper low to the NW. Upper westerlies cover the UK with MetO due to a
deep low to the NW. ECM is very similar to MetO, with upper westerlies,
while GEM shows an upper trough extending across the UK from the west.
At the surface, GFS has a secondary low to the NE and complex low pressure
to the NW. WNW'lies cover the UK as a result, while MetO has WSW'lies from a
low to the NW. ECM also shows WSW'lies and a low to the NW. GEM brings a low
over Wales with easterlies to the north and a mixture of WSW'lies and
SW'lies to the south.

Evolution to T+168
ECM shows WSW'lies on day 6 as a strong zonal flow continues. A secondary
low moves eastwards along the English Channel on day 7, with WSW'lies for
most.
WSW'lies cover the UK on day 6 with GFS as the result of complex low
pressure to the north and NW. A low deepens to the west on day 7, leading to
strong southerlies and SSW'lies.

Looking further afield
ECM brings further zonality out to day 10, with SW'lies on day 8, WSW'lies
on day 9 and NNW'lies on day 10.
Day 8 with GFS shows WSW'lies as low pressure fills to the north. A new low
to the west brings SSE'ly gales on day 9 and by day 10 it deepens east of
Scotland, with westerly gales.

Ensemble analysis
(http://91.121.94.83/modeles/gens/gra...ille=Lon dres)
The ensembles continue to show unrelenting zonality.