Here is a summary of the NWP output for noon on Friday.
Issued 0447z, 13/06/11

The weekend will see unsettled weather across much of the UK as low pressure
moves eastwards, although the south and west may stay dry on Sunday.
Temperatures will be close to average.

Analysis and evolution to T+120 via GFS
Low pressure covers Northern Ireland with easterlies for Scotland as a
result. England and Wales lie under SW'lies. There are westerlies for all
tomorrow as a weak ridge builds over the UK, followed by southerlies on
Wednesday ahead of a low to the west. On Thursday a weak trough covers the
UK, bringing southerlies.

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 strong, southerly-tracking jet over the Atlantic
and Biscay. At the 500hPa level there are southerlies with a trough to the
west. The other runs have upper SW'lies with a low to the NW.
At the surface GFS brings southerlies due to a low over Northern Ireland.
MetO has SSW'lies with a trough to the west, while ECM has SW'lies with lows
to the NE, NW and SW. GEM and JMA show a trough over Scotland and Northern
Ireland with SW'lies elsewhere.

Evolution to T+168
Day 6 with ECM shows low pressure crossing the UK, followed by a weak ridge
and westerlies on day 7.
GFS brings WSW'lies for all on day 6 with lows to the WNW and ENE. There are
further WSW'lies on day 7 with a trough over Scotland and a secondary low to
the SW.

Looking further afield
Days 8 to 10 with ECM show southerlies and SW'lies as another low moves
slowly eastwards to end up over Northern Ireland on day 10.
GFS days 8 to 10 show a col followed by a trough crossing the UK, leading to
northerlies in its wake.

Ensemble analysis
http://www.meteociel.com/cartes_obs/...&ville=Londres
The GEFS shows near average temperatures for the next week to 10 days.

ECM ensembles
http://www.meteogroup.co.uk/meteo/ep...tt6-london.gif
ECM shows three relatively warm days followed by a cooler spell.