Here is a summary of the NWP output for noon on Thursday.
Issued 0529, 28th February 2010

At the end of the week strong NE'lies will cover the UK, with rain (perhaps
sleety over high ground) in the SE and south. For the weekend and beyond
high pressure will persist to the west or NW, bringing much drier weather
than of late for most albeit with the risk of showers in the east.

Analysis and evolution to T+120 via GFS
Low pressure lies to the south, leading to NE'lies for the UK. Tomorrow the
low moves away to the east, leaving England and Wales under westerlies and
bringing a col elsewhere. A weak ridge brings light winds for most on
Tuesday, followed by SE'lies with a low to the west on Wednesday.

T+120 synopsis
http://91.121.93.17/pics/Rtavn12015.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 split jet over the North Atlantic, with the UK
lying under a trough. At the 500hPa level there are NNE'lies, with a ridge
to the west. ECM has an upper low over the UK, as is the case with MetO. GEM
has NNE'lies as with the GFS and JMA brings upper northerlies.
At the surface, GFS brings strong to gale force NE'lies over most of the UK
(westerlies in the far north), with a high to the west and a low over
France. ECM has a low further north, over the Netherlands, leading to
northerlies. MetO has a large, slack low over England and Wales with NE'lies
elsewhere. GEM has ENE'lies with lows to the south and JMA shows NE'lies
with a trough over Belgium.

Evolution to T+168
ECM has NE'lies on days 6 and 7 as high pressure builds to the west.
GFS brings a ridge from the west on days 6 and 7. NW'lies spread from the
north to affect most areas by day 7.

Looking further afield
ECM shows NNE'lies on days 8 to 10 with high pressure persisting to the WNW.
GFS has NW'lies for most on days 8 to 10 as high pressure remains to the
west.

Ensemble analysis
(http://91.121.94.83/modeles/gens/gra...ille=Lond res)
The GEFS now shows a brief cold snap at the end of the week.

ECM ensembles
http://www.meteogroup.co.uk/meteo/ep...tt6-london.gif
Yesterday's ECM was again close to the mean, showing as it did a colder
spell next week.