Here is a summary of the NWP output for 12z on Sunday.
Issued 0526z, 27th June 2007.

The start of next week will be unsettled for all, with low pressure close to
the UK. During the latter half of the week the models split; GFS moves the
jet north and introduces warmer and more settled conditions, while ECM
maintains the status quo.

Analysis and evolution to T+120 via GFS
http://expert.weatheronline.co.uk/pslv_frame.htm
Complex low pressure covers Scandinavia, with a trough over northern parts
of the UK. Winds are NW'lies behind the trough and westerlies or WSW'lies
ahead of it. Tomorrow westerlies affect all areas, with a trough to the
north. By Friday a low forms to the west of Scotland, leading to SW'lies for
all. A weak ridge moves NE'wards on Saturday, ahead of the next Atlantic
low.

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 jet stream chart shows an unusually strong and zonal jet across the
North Atlantic and Biscay. At the 500hPa level there's a large upper low
over the UK, ECM has a shallower low centred further west, while GEM has a
low over the Celtic Sea. NGP shows an upper low over Scotland.
At the surface GFS brings a large low over scotland and Northern Ireland,
with SW'lies elsewhere. ECM shows SE'lies and easterlies with a low over
Ireland and GEM is very similar. NGP has a low over Scotland and westerlies
for most.

Evolution to T+168
ECM shows the upper low remaining close to the UK. Day 6 sees a surface low
over the UK and by day 7 it moves slowly northwards over northern Scotland,
bringing westerlies to much of the UK.
GFS brings moderate WSW'lies on day 6 as a trough crosses Scotland. By day 7
the trough moves northwards, leaving the UK under further WSW'lies.

Looking further afield
ECM shows WNW'lies and westerlies on days 8 to 10, as low pressure moves
away to the east on day 8 and a new low moves ENE'wards to the north of the
UK on days 9 and 10.
GFS bnrings a ridge with westerlies on day 8, followed by WSW'lies on day 9
as pressure builds over France. By day 10 SE'lies and southerlies cover the
UK, with an upper ridge building to the east.

Ensemble analysis
(http://expert.weatheronline.co.uk/da...ia/ensdia.html - last
night's 18z)
The ensembles show two more cold days aloft, followed by 5 or 6 days of
average temperatures aloft.