Here is a summary of the latest NWP output for noon (GMT) on Saturday.
Issued 0405z, 19/06/12.

Saturday will be a breezy day with a high chance of rain for most due to a
nearby low. GFS has a col for Sunday but the other runs show a continuation
of unsettled conditions with low pressure close by.

ECMWF: http://www.wetterzentrale.de/pics/Recm1201.gif
Moderate SW'lies cover the UK as the result of lows to the north and WSW.
The latter moves across the UK on day 6, then away to the NE on day 7. The
UK lies under WNW'lies at this stage, followed by a col on day 8. Day 9 sees
southerlies over the UK as low pressure deepens to the west; the winds drag
up hot air over the SE of England. Day 10 sees the low deepen over Scotland
with strong SW'lies across the UK.

MetO: http://www.wetterzentrale.de/pics/Rukm1201.gif
The MetO run shows southerlies and a low to the WNW. The low fills over
Scotland on day 6, bringing WSW'lies to all.

GFS: http://www.wetterzentrale.de/pics/Rtavn1201.png
Low pressure lies to the NE, leading to westerlies and WSW'lies over the UK.
A col covers the UK on day 6 and day 7. On day 8 there are light WNW'lies
and a weak ridge, followed by more of the same on day 9. Day 10 sees
westerlies for all with a ridge over southern areas.

GEM: http://www.wetterzentrale.de/pics/Rgem1201.gif
The Canadian output shows SSW'lies and a deep low to the NW.

JMA: http://www.wetterzentrale.de/pics/Rjma1201.gif
The Japanese run brings SSW'lies as per the GEM run.