Here is a summary of the NWP output for noon on Monday.
Issued 0531, 29th October 2009

The first half of the working week will be wet and windy across most of the
UK.

Analysis and evolution to T+120 via GFS
Southerlies and SSW'lies cover the UK, with a high to the east and a low far
to the west. There are SSE'lies tomorrow as pressure builds to the NE,
followed by southerlies and SSW'lies on Saturday. On Sunday low pressure to
the west brings southerlies for all.

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 broad and strong westerly flow over the Atlantic
and the UK. At the 500hPa level there are also strong westerlies, while ECM
has a sharp upper trough over the UK with SSW'lies aloft. MetO has
westerlies aloft, as is the case with GEM and JMA.
At the surface, GFS brings SW'ly gales, with a large and complex low to the
NW. ECM shows a trough over the Irish Sea, with southerlies in advance and
westerlies following behind. MetO has SW'lies for all and a weak trough,
while GEM shows a trough to the east and westerlies. JMA's trough covers the
Irish Sea, leading to SSW'lies.

Evolution to T+168
ECM brings westerlies on day 6 as low pressure deepens over the North Sea.
Another low deepens as it crosses the UK on day 7, leading to NW'lies for
all areas except Scotland, which lies under southerlies.
GFS has a deep low to the north and WSW'ly gales as a result. The winds ease
slightly on day 7 as the low fills.

Looking further afield
ECM shows low pressure over Wales on day 8, with a col over England and
NE'lies elsewhere. NNW'lies cover the UK on day 9 as the low moves away
SE'wards and fills. Day 10 sees WNW'lies and a weak ridge to the west.
Day 8 with GFS shows WNW'lies and a trough to the east, followed by SW'lies
as another trough approaches from the west. On day 10 the trough moves away
to the east, leaving westerlies over the UK.

Ensemble analysis
(http://91.121.94.83/modeles/gens/gra...ille=Lond res)
The ensembles continue show a change to colder and wet conditions at the
weekend.