Here is a summary of the NWP output for noon on Sunday.
Issued 0513, 28th November 2007

The first half of the week will see a ridge moving eastwards over the UK,
bringing a dry day or two to most areas. After that, more rain is likely as
troughs cross the UK from the west, driven on by a strong jet.

Analysis and evolution to T+120 via GFS
http://85.214.49.20/pics/Rtavn001.png
SSW'lies cover the UK, with low pressure to the north and a ridge to the
east. Tomorrow there are further SW'lies and SSW'lies, as a trough crosses
Ireland. A weak ridge brings more SW'lies on Friday, before complex low
pressure to the NW and NE leads to WSW'lies on Saturday.

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/Rjma1201.gif /
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 a strong and zonal jet over the UK, albeit with
more amplitude than over the past few days. At the 500hPa level there's a
NW'ly flow over the UK, with a low to the NE and a ridge to the SW. ECM has
a trough over the UK, while MetO has a weaker trough. GEM shows a strong
WSW'ly gradient aloft, with a deep upper low to the NNW.
At the surface GFS brings WNW'lies with complex low pressure to the NE and a
large high to the WSW of Iberia. ECM has a trough over Scotland and WSW'ly
gales elsewhere. Strong WSW'lies cover the UK on the MetO run, with a trough
over the North Sea. GEM has WSW'ly gales as the result of complex low
pressure to the NE and NW.

Evolution to T+168
ECM shows westerlies on day 6 as low pressure transfers eastwards to the
north. Day 7 sees further westerlies as the lows move only slowly eastwards.
GFS brings a ridge over the UK on day 6, but it doesn't last as by day 7
southerlies associated with a trough to the west move across the UK.

Looking further afield
The ECM shows southerlies on day 8 as a trough moves towards the UK from the
west. The trough disrupts over the UK on day 9, leading to SE'lies over the
eastern half of England. Elsewhere there are SW'lies. By day 10 southerlies
cover the UK, with a trough to the west.
Day 8 with the GFS shows SSW'lies and a trough over the UK, followed by
another trough on day 9. This leads to WNW'lies for most, followed by
SW'lies on day 10 ahead of yet another trough.

Ensemble analysis
(http://expert.weatheronline.co.uk/da...ia/ensdia.html - last
night's 18z)
The ensembles for London continue to show a mild, wet and windy spell on the
way.