Here is a summary of the NWP output for 12z on Sunday.
Issued 0545z, 11th April 2007.

The signs of a change from yesterday have been put back a day or two, with
warm weather persisting until the first half of next week. Thereafter the
most likely option is for things to cool a fair bit, but there's a growing
chance of it staying warm into the second half of next week.

Analysis and evolution to T+120 via GFS
http://85.214.49.20/pics/Rtavn001.png
http://85.214.49.20/pics/avnpanel1.gif
High pressure covers southern England, with westerlies for all. The winds
fall light tomorrow for most as high pressure covers the UK. There's little
change on Friday, but by Saturday a mixture of easterlies and SE'lies covers
the UK as the high moves away to the east.

T+120 synopsis
http://85.214.49.20/pics/Rtavn12015.png /
http://85.214.49.20/pics/Rtavn1201.png
http://85.214.49.20/pics/Rjma1201.gif /
http://85.214.49.20/pics/Rukm1201.gif
http://85.214.49.20/pics/Recm1201.gif /
http://www.meteociel.fr/modeles/nogapse_cartes.php
The jetstream chart shows a large ridge over Europe and the jet passes to
the north of the UK. At the 500hPa level there's an upper high to the east
and a trough to the NW. There's a stronger upper high with ECM, over
Germany, while MetO has the high slightly further east. NGP has an upper
trough over the UK and an upper high to the SE, while GEM has an upper high
over the North Sea instead.
At the surface GFS brings light winds for all due to a col. ECM has a
mixture of SE'lies and easterlies due to a high over the Baltic, while MetO
brings SW'lies for all and a trough over Scotland and Northern Ireland. NGP
shows a mixture of westerlies and NW'lies as the result of a high to the
WSW.

Evolution to T+168
ECM shows a col at T+144 and a mixture of westerlies and NW'lies at T+168 as
the Azores High builds to the WSW.
GFS brings a ridge over Scotland and Northern Ireland on day 6, leading to
NE'lies elsewhere. THere's little change at T+168.

Looking further afield
ECM shows high pressure over England and Wales on days 8 and 9, with SW'lies
elsewhere/ By day 10 pressure builds to the south of Greenland, resulting in
NW'lies.
GFS brings a col on day 8, before southerlies pick up ahead of a low to the
SW on days 9 and 10.

Ensemble analysis
(http://expert.weatheronline.co.uk/da...ia/ensdia.html - last
night's 18z)
The ensembles show another warm and dry 5 or 6 days, before a marked drop in
temperatures (to slightly below average temperatures aloft). Since yesterday
a few of the London ensembles now stay warm throughout.