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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 (GMT) on Friday. Issued
0600z, 22/09/03. ECMWF: http://www.wetterzentrale.de/pics/Recm1201.gif A deep low lies to the west of Scotland, bringing moderate SSW'lies over much of the UK. The low deepens to the NE of Northern Ireland at T+144, with westerly gales for Northern Ireland and southern Scotland. Strong to moderate WSW'lies cover England and Wales, slightly lighter southerlies and easterlies for the rest of Scotland. The low fills to the east of Scotland at T+168, with westerlies over England and Wales, NW'lies for Northern Ireland and northerlies for Scotland. MetO: http://www.wetterzentrale.de/pics/Rukm1201.html As with the ECM run, a deep low is located west of Scotland. This bring moderate SW'lies over England and Wales, with strong SW'lies for Northern Ireland. Scotland lies under SSW'lies and southerlies, near gale force in the west. The low fills in situ at T+144, with southerlies for central Scotland northwards and westerlies elsewhere. GFS: http://www.wetterzentrale.de/pics/Rtavn1081.gif England and Wales lie under SW'lies, as the result of a low over Scotland and Northern Ireland. The low deepens to the east of Scotland at T+120, with a trough over England. To the east of the trough, winds are SW'lie, wheras the rest of the UK lies under NNE'lies, northerlies and NNW'lies. 850hPa temperatures range from freezing over the Western Isles to +9C over SE England. By T+144 the low moves away to the NE, leaving a trough over the UK. England and Wales lie under westerlies, with NE'lies elsewhere. Light NE'lies and easterlies cover the UK at T+168, with low pressure over France and a trough over the North Sea. The winds become westerlies and NW'lies on day 8, as the low deepens over the North Sea. Day 9 sees westerlies and southerlies, as a result of a trough over the Celtic Sea. By day 10, SW'lies from a low to the NW cover the UK. GEM: http://www.wetterzentrale.de/pics/Rgem1201.gif A trough covers the North Sea, bringing SW'lies to SE England and northerlies elsewhere. Northerlies cover the whole of the UK at T+144, with 850hPa temperatures from -1C over northern Scotland to +5C over Kent. By T+144 the winds become NE'lies over England and Wales, due to a ridge over Northern Ireland. Much of Scotland is affected by northerlies, with westerlies in the far north. JMA: http://www.wetterzentrale.de/pics/Rjma1201.html The Japanese run shows a northerly flow for much of the UK, with a trough over the North Sea and a high to the west of the UK. 850hPa temperatures range from -2C over the Western Isles to +2C over SE England. By T+144 the high moves over Ireland, bringing westerlies to northern Scotland and NNE'lies for England and Wales. The high declines over the UK at T+168, with light winds for all. Model overlay charts (GEM/GFS/JMA): http://expert.weatheronline.co.uk/da.../ens/pslv.html The T+108 chart shows a fair jumble of spaghetti, albeit with a trough close to or over the UK. In summary, today's runs are mixed. The ECM, GFS and MetO runs show an unsettled end to the week for all, whereas the GEM and JMA show cooler northerlies, with the least settled conditions in the east rather than the NW. The differences continue over the weekend, too, with the JMA and GEM showing a settled Sunday, the MetO and ECM keeping that low nearby and the GFS taking the low NE'wards instead. As ever, more runs are needed. |
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