Here is a summary of the latest NWP output for noon (GMT) on Saturday.
Issued 0455z, 23rd June 2009.

The weekend will see warm, sticky weather across the UK with the risk of
slow-moving torrential showers.

ECMWF: http://expert.weatheronline.co.uk/da...mwf/ecmwf.html
Easterlies cover much of the UK, with troughs over SE England and Ireland.
Easterlies persist on day 6, but by day 7 low pressure deepens to the west
and a SE'ly flow affects the UK.

MetO: http://expert.weatheronline.co.uk/da...ukmo/pslv.html
England and Wales lie under a col, with ENE'lies elsewhere from a high to
the north. A ridge moves westwards over the UK on day 6, with light SE'lies
as a result.

GFS: http://expert.weatheronline.co.uk/pslv_frame.htm
A col covers the UK, bringing light winds for all. On day 6 a weak ridge
leads to easterlies, followed by SE'lies for many on day 7 as a weak trough
crosses Ireland.

GEM: http://expert.weatheronline.co.uk/da.../gem/pslv.html
The Canadian run brings a col over Ireland, a trough over SE England and a
mixture of ENE'lies and NE'lies as a result.

JMA: http://www.wzkarten.de/pics/Rjma1201.gif
The Japanese run shows a col and light winds.