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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,
23/09/04. The models still show an increasingly settled picture (especially for southern areas) by the middle of next week. However, there are considerable differences with the positioning of the high between the runs. As ever, more runs are needed. ECMWF: http://64.246.48.81/pics/Recm1201.gif A ridge lies to the west, with low pressure over southern Norway bringing northerlies and NW'lies over the UK. The rige builds to become a high over the UK at T+144, with light winds for all. There's little change at T+168 as the high moves slowly eastwards. MetO: http://www.wetterzentrale.de/pics/Rukm1201.html NW'lies cover the UK as the result of high pressure to the SW and low pressure to the west of Norway. The high moves over the UK at T+144, with light winds for all. GFS: http://64.246.48.81/pics/Rtavn1201.gif The British Isles lie under westerlies, with the UK between a low north of Scotland and high pressure over France. 850hPa temperatures vary from +8C over northern Scotland to +11C over SW England. The low moves away at T+144, as does the high; this leaves the UK under a continuation of westerlies. A ridge builds over England and Wales at T+168, leading to SSW'lies and SW'lies, followed by more of the same on day 8 as the ridge moves eastwards. Another ridge builds over the UK on day 9 with light winds for all, with light southerlies on day 10 as the ridge moves eastwards. GEM: http://www.meteocentre.com/models/glb00_120.html High pressure is centred over the English Channel, with westerlies for much of the UK as a result. 850hPa temperatures range from +10C over northern Scotland to +13C over southern England. The high declines and drifts ENE'wards at T+144, allowing SSW'lies to affect Northern Ireland and SW'lies to move over Scotland. JMA: http://www.wetterzentrale.de/pics/Rjma1201.html The Japanese run shows a large high to the SW, with a ridge to the west of the UK. Westerlies cover much of the UK as a result, although western Scotland and parts of Northern Ireland lie under NW'lies. 850hPa temperatures vary from +1C over NW Scotland to +14C over SW England. Northerlies and NW'lies are displayed on the T+144 chart, as the ridge to the west builds, followed by lighter winds for most as the ridge topples over the UK on day 7. The high builds over the Low Countries on day 8, bringing southerlies and SW'lies for the UK. |
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