Here is a summary of the latest NWP output for noon (GMT) on Friday. Issued
0504z, 20th April 2009.

The models are mixed today. GFS builds high pressure to the north for the
weekend, with easterlies as a result and the potential for rain in the south
of the UK. ECM, meanwhile, has a weaker ridge further south with rain for
the north and fine weather for the south.

ECMWF: http://expert.weatheronline.co.uk/da...mwf/ecmwf.html
England and Wales lie under a col, with SW'lies elsewhere from a trough to
the west. On day 6 a ridge builds from the west, bringing WSW'lies to
Scotland and Northern Ireland and northerlies elsewhere. WSW'lies cover the
UK on day 7 as the ridge sinks southwards.

MetO: http://expert.weatheronline.co.uk/da...ukmo/pslv.html
Unavailable.

GFS: http://expert.weatheronline.co.uk/pslv_frame.htm
A col covers the UK, with light winds for all. On day 6 pressure builds to
the north, leading to light ENE'lies for the UK. The ENE'lies persist on day
7 as pressure remains high to the north.

GEM: http://expert.weatheronline.co.uk/da.../gem/pslv.html
The UK lies under southerlies and SSW'lies, with a trough to the west.

JMA: http://www.wzkarten.de/pics/Rjma1201.gif
The Japanese run shows southerlies for all, again due to a trough to the
west.