Here is a summary of the latest NWP output for noon (GMT) on Saturday.
Issued 0500z, 11th August 2009.

The end of the weekend will see a deep low close to the UK, although its
exact track is uncertain. GFS shows a slow and deep low, with widespread
rain and strong winds for a couple of days, while ECM moves the low
eastwards faster with just one really wet day. MetO keeps the low away from
the UK, with less rain.

ECMWF: http://www.wzkarten.de/pics/Recm1201.gif
Low pressure lies to the east, with NE'lies for Scotland and moderate
WSW'lies elsewhere. The low deepens to the east on day 6, resulting in
NW'lies and northerlies.On day 7 a weak ridge moves swiftly eastwards, with
SW'lies for all.

MetO: http://www.wzkarten.de/pics/Rukm1201.gif
A trough covers the UK, with WSW'lies as a result. Westerlie cover the UK on
day 6 as a low deepens to the NE.

GFS: http://www.wzkarten.de/pics/Rtavn1201.png
Low pressure covers Northern Ireland, with southerlies for much of the UK.
NW Scotland lies under easterlies. The low fills and drifts eastwards on day
6, with strong SW'lies for England and Wales and NE'ly gales elsewhere.
Moderate northerlies and NW'lies cover the UK on day 7, as the low fills
over the North Sea.

GEM: http://www.wzkarten.de/pics/Rgem1201.gif
The Canadian run brings SSW'lies ahead of a low to the west.

JMA: http://www.wzkarten.de/pics/Rjma1201.gif
The Japanese run has SW'lies and WSW'lies due to a deep low to the west.