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uk.sci.weather (UK Weather) (uk.sci.weather) For the discussion of daily weather events, chiefly affecting the UK and adjacent parts of Europe, both past and predicted. The discussion is open to all, but contributions on a practical scientific level are encouraged. |
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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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