Here is a summary of the NWP output for noon on Tuesday.
Issued 0453, 26th March 2010

The latter half of the working week will be cool, windy and unsettled with
low pressure never far from the UK.

Analysis and evolution to T+120 via GFS
Low pressure covers the UK, with NE'lies for Scotland and southerlies
elsewhere. Tomorrow a col covers much of the UK as a secondary low lies to
the south. Sunday sees SW'lies for most with a low to the north, followed by
another col on Monday before a trough moves in from the west.

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 marked trough over the UK, with the het heading
SE'wards from Greenland to Iberia. At the 500hPa level there's also a trough
over the UK. ECM has an upper trough over western areas of the UK, while
MetO has an upper col. An upper trough covers the UK with GEM and JMA shows
a trough to the west.
At the surface, GFS brings strong NW'lies with a low over the North Sea. ECM
has a deep low over Englnad and Wales with northerlies and NW'lies moving in
from the west. MetO also has a low over England with northerlies and NW'lies
spreading eastwards. GEM brings NW'lies for all with a low to the east and
JMA has NE'lies with a low to the south.

Evolution to T+168
ECM brings strong to gale force NW'lies on day 6 due to a low to the east,
followed by further NW'lies and WNW'lies as the low fills on day 7.
GFS shows westerlies and WNW'lies on day 6 as a secondary low moves
SE'wards. The low deepens over East Anglia on day 7, with NW'lies for
England and Wales and SW'lies elsewhere.

Looking further afield
ECM shows low pressure stalling over the North Sea, with NW'lies as a result
on days 8 to 10.
GFS brings cold SW'lies on day 8 as low pressure approaches from the west.
The low crosses the UK on days 9 and 10, leaving NW'lies in its wake.

Ensemble analysis
(http://91.121.94.83/modeles/gens/gra...ille=Lond res)
The GEFS shows a marked cold spell next week.

ECM ensembles
http://www.meteogroup.co.uk/meteo/ep...tt6-london.gif
The ECM ensembles now show colder weather next weel, followed by a slow
return to average.