Here is a summary of the NWP output for 12z on Monday.
Issued 0535z, 28th March 2007.

High pressure will dominate the UK for the first half of next week, although
there remain differences between the models regarding its position. However,
initially at least it will be to the NW or WNW, leading to cool easterlies
for much of England and Wales with lighter winds to the north. Beyond that
GFS brings the high SE'wards with increasingly warm weather for the UK,
while ECM and MetO instead show a northerly setting in as the high remains
to the NW.

Analysis and evolution to T+120 via GFS
http://85.214.49.20/pics/Rtavn001.png
http://85.214.49.20/pics/avnpanel1.gif
A low lies to the east of the UK, with NW'lies and northerlies as a result.
Tomorrow the low deepens, bringing stronger NNE'lies for most. On Saturday
high pressure builds strongly to the north, leading to NE'lies for all. The
winds become ENE'lies on Sunday as the high builds and moves ESE'wards.

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 continues to show a "Rex block" over the UK, with a
ridge to the north and a trough to the south. At the 500hPa level there's a
large high south of Iceland and a low west of Iberia. Meto has a high
further SSW and the low closer to Iberia, while ECM shows the high closer to
Scotland and a strong upper ridge over the UK. GEM also shows a strong upper
high close to Scotland.
At the surface GFS brings a large high to the WNW with a ridge over
Scotland. Elsewhere winds are ENE'lies, as is the case with MetO. ECM shows
high pressure centred to the west of Scotland and ENE'lies over England,
Northern Ireland and Wales. GEM is very similar with the centre a couple of
hundred miles further NW.

Evolution to T+168
ECM shows the high retrogressing on day 6, leading to northerlies spreading
across the UK. The high persists to the NW on day 7 with NNE'lies as a
result.
GFS brings light winds on day 6 as the high moves SE'wards across the UK.
Day 7 sees the high decline over the North Sea, with SW'lies for Scotland,
southerlies for Northern Ireland and easterlies elsewhere.

Looking further afield
ECM shows high pressure slowly moving southwards to the west of the UK,
leading to a mixture of northerlies and NW'lies on days 8 to 10.
GFS brings a ridge from the north over the UK on day 8 with light NE'lies as
a result, followed by southerlies on day 9 as the high builds to the NE. By
day 10 strong SSW'lies cover the UK as the result of a low to the west.

Ensemble analysis
(http://expert.weatheronline.co.uk/da...ia/ensdia.html - last
night's 18z)
The ensembles show a warm spell for the next week, followed by a marked
cooling to near normal values.