Here is a summary of the NWP output for 12z on Friday.
Issued 0545z, 19th March 2007.

The weekend will see either a col or easterlies, depending on the exact
positioning of the Scandinavian High. Rain is likely for eastern areas and
possible for westernmost areas as a trough will pass close by; temperatures
will be near average for most.

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 deep low lies to the NE, dragging cold northerlies and NW'lies over the
UK. Tomorrow the winds become NNW'lies for all, as a ridge moves in from the
west. The ridge moves over Scotland and Northern Ireland on Wednesday, with
NNW'lies persisting elsewhere. Thursday sees a weak trough over Scotland and
Northern Ireland, with a col elsewhere.

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 the UK under a ridge, with the jet heading
northwards over Iceland and the eastern side of Greenland. At the 500hPa
level there's a large high over Scandinavia and a trough over much of
western and southern Europe. ECM has a similar picture, although the upper
high is further ESE. MetO shows the upper high over the Baltic whilei GEM
has an elongated upper high to the north and NE of the UK.
At the surface GFS shows a Scandinavian High, with easterlies for England
and Wales and SE'lies elsewhere. ECM brings a col over much of the UK and a
ridge over northern Scotland, with light winds for all. MetO also shows a
col for most, while GEM brings NE'lies as pressure builds to the NE.

Evolution to T+168
ECM shows much of the UK under a col on days 6 and 7, with southerlies for
western Scotland and Northern Ireland as a trough attempts to move in from
the west.
GFS keeps the UK under easterlies and SE'lies on day 6 as the high to the NE
persists. It declines on day 7, allowing southerlies to affect all areas
ahead of a trough to the west.

Looking further afield
ECM shows a col on day 8 before easterlies set in on days 9 and 10 due to
the Scandinavian High retrogressing.
GFS brings SW'lies over the UK on days 8 to 10 due to pressure building to
the SE.

Ensemble analysis
(http://expert.weatheronline.co.uk/da...ia/ensdia.html - last
night's 18z)
The ensembles show temperatures around average within 3 days for northern
areas, with another week of below average temperatures further south.