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Old January 27th 05, 06:18 AM posted to uk.sci.weather
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Default Today's model interpretation (27/01/05)

Here is a summary of the latest NWP output for noon on Monday. Issued 0616z,
27/01/05.

The runs show signs of a change today. It's looking increasingly likely that
our high will sink southwards, although as yet the models are split as to
what that will mean for the UK. At one extreme the GFS brings in an easterly
and although it's an outlier there are 4 other ensemble members showing an
easterly at some stage. The JMA shows the other extreme, with mild NW'lies
bringing nondescript weather for all. As ever, more runs are needed.

ECMWF: http://64.246.48.81/pics/Recm1201.gif
Northerlies cover the UK, with high pressure to the WSW of Ireland. The high
sinks SW'wards at T+144, with northerlies and NW'lies for the UK. By T+168
the UK lies under a ridge from the SW, with westerlies and northerlies.

MetO: http://www.wetterzentrale.de/pics/Rukm1201.html
The MetO run also shows a high to the west, with northerlies. The
northerlies ease at T+144 as the high declines slightly.

GFS: http://expert.weatheronline.co.uk/pslv_frame.htm
An elongated high lies to the west, while a deep low covers the Baltic.
Winds are strong northerlies over much of the UK, with 850hPa temperatures
from -9C over NE Scotland to -1C over Northern Ireland. The winds become
NNW'lies at T+144 as the high and low both sink southwards, followed by
light winds for most at T+168 due to a col. SE England lies under cold
NE'lies however and by day 8 cold SE'lies cover much of the UK, with a low
heading SE'wards to the south of the UK. The Azores High has merged with a
new high coming east from Newfoundland and recentred itself further west.
Day 9 sees a low to the west bringing southerlies for Scotland and Northern
Ireland, with easterlies elsewhere. By day 10 low moves over Biscay,
allowing high pressure to extend from Greenland to northern Finland.
Moderate, cold, ENE'lies are the result across the UK.
As expected, the ensembles confirm this run was a marked cold outlier.
(http://64.246.48.81/pics/MT8_London_ens.png )

GEM: http://www.meteocentre.com/models/glb00_120.html
The Canadian run shows NNW'lies for all, again with a high to the west. The
high sinks southwards at T+144, with northerlies persisting. By T+168 the
high lies to the SW, while the Russian High builds and moves westwards
towards Scandinavia. This has the effect of introducing cold NE'lies over
much of England, with northerlies for Wales and Northern Ireland (Scotland
lies under a col). Day 8 sees the Russian High continue its westward
movement, with a ridge over the UK. To the north and west there are SW'lies,
with cold NE'lies for SE England in particular.

GME/DWD:
http://www.wetter.com/home/img/sat/g...270000_120.gif
As with the other runs, a high is located to the west, this time bringing
northerlies for all. The high sinks SSW'wards at T+144 and by T+168 it
continues its SW'wards movement, allowing northerlies and NW'lies to affect
the UK.

JMA: http://www.wetterzentrale.de/pics/Rjma1201.html
The Japanese run shows a high to the SW of Ireland slowly moving SW'wards,
with the UK under relatively mild NW'lies from T+120 to day 8.

NOGAPS: http://129.13.102.67/wz/pics/ngp10.prp.120.europeg.gif
NNW'lies cover the UK, once again with high pressure to the west. The high
declines at T+144, allowing NW'lies to affect the UK.

GM CPTEC: http://www.cptec.inpe.br/prevnum/Global126_sx6_Gl.shtml
Unavailable today.

KMA: http://www.kma.go.kr/kma03/gif/g21nh_smsr_120.gif
High pressure is centred just to the west of Ireland, bringing northerlies
for all.




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