?Here is a summary of the NWP output for noon on Monday.
Issued 0515, 6/01/11

Zonality will affect the UK for the first half of the week. Pressure will be
low to the north, with SW'lies spreading across the UK. Temperatures will be
close to or above average by the middle of the week and there'll be plenty
of rain (with snow over the mountains).

Analysis and evolution to T+120 via GFS
A col covers England and Wales, with NW'lies and WNW'lies further north.
Tomorrow there's a col over the whole of the UK, followed by southerlies for
England and Wales on Saturday as low pressure moves up from the south.
Scotland and Northern Ireland lie under a col. Sunday sees WSW'lies for most
as low pressure moves away to the NE.

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 and zonal jet over the North Atlantic and
the UK. At the 500hPa level there's a zonal flow over the UK and Europe, as
is the case with MetO and ECM. GEM and JMA also show zonality over the
Atlantic, although GEM has an upper trough over the UK.
At the surface GFS brings a trough over northern Scotland and strong SW'lies
elsewhere. MetO has SE'lies for Scotland with a trough over northern
England. Elsewhere winds are SW'lies. ECM has a ridge over England and
SSW'lies for all, while GEM brings a col and light winds. JMA shows a col
too.

Evolution to T+168
ECM shows SW'lies on day 6 as a low moves away to the NE. Another low
deepens to the WNW on day 7, leading to further SW'lies.
GFS brings strong SW'lies on day 6 with lows to the NW, north and NE.
There's little change on day 7.

Looking further afield
Days 8 to 10 with ECM generally show SW'lies, with low pressure crossing
northern Scotland.
SW'lies cover the UK on day 8 with GFS due to a low to the west. There's a
col on day 9, followed by a ridge on day 10.

Ensemble analysis
http://www.meteociel.com/cartes_obs/...&ville=Londres
The 0z GEFS shows a typical "sine wave" zonal pattern.

ECM ensembles
http://www.meteogroup.co.uk/meteo/ep...tt6-london.gif
ECM brings a zonal flow too, with temperatures fluctuating over the next
week before becoming mild for a prolonged period.