Here is a summary of the NWP output for noon on Monday.
Issued 0557, 24/02/11

The first half of the working week will see largely settled conditions over
England and Wales, with rain further north and west as a trough moves
southwards. The latter half of the week is much less certain, with GFS going
for a colder and unsettled spell, while ECM keeps high pressure close by
instead.

Analysis and evolution to T+120 via GFS
SW'lies cover the UK, with a weak trough to the east. There are stronger
SSW'lies tomorrow, followed by WSW'lies on Saturday as another trough moves
eastwards. A weak ridge brings lighter westerlies and WNW'lies on Sunday.

T+120 synopsis
http://www.wetterzentrale.de/wz/pics/Rtavn12014.png
http://www.wetterzentrale.de/wz/pics/Rtavn1201.png
http://www.wetterzentrale.de/wz/pics/Rukm1201.gif
http://www.wetterzentrale.de/wz/pics/Recm1201.gif
http://www.wetterzentrale.de/wz/pics/Rjma1201.gif
The jetstream chart shows a ridge over the UK, something which is reflected
at the 500hPa level. MetO also shows a ridge over the UK, while ECM's ridge
is further west with upper northerlies as a result. JMA is similar to ECM
and GEM is closer to GFS/MetO, with a ridge over the UK.
At the surface GFS, MetO and GEM have a ridge over the UK and light winds.
ECM and JMA have a ridge slightly further SW, with SW'lies for Scotland.

Evolution to T+168
ECM has a high over the UK on day 6, followed by SW'lies for Scotland and
Northern Ireland on day 7 as the high weakens.
GFS shows a trough over Scotland and Northern Ireland on day 6, with SW'lies
there and a col elsewhere. On day 7 northerlies and NE'lies cover the UK, as
pressure builds strongly to the NW.

Looking further afield
Days 8 to 10 with ECM show NW'lies easing as a ridge moves over the UK.
GFS brings easterlies and NE'lies on days 8 to 10 as high pressure transfers
eastwards to the north of the UK.

Ensemble analysis
http://www.meteociel.com/cartes_obs/...&ville=Londres
The 0z GEFS shows generally average or mild conditions for the next week,
followed by a few colder days.

ECM ensembles
http://www.meteogroup.co.uk/meteo/ep...tt6-london.gif
ECM shows mild conditions for the next 3 days, followed by slightly
less-mild conditions.