HERE IS MY LATEST ANALYSIS USING DATA SUPPLIED BY THE NWP OUTPUT COVERING 5 OF THE WORLDS MOST POWERFUL WEATHER COMPUTERS ISSUED AT 09:00 ON THURSDAY SEP 10TH 2015
THE CURRENT GENERAL SITUATION High pressure will continue to drift slowly away NE into Scandinavia over the next 24-48hrs with an ESE flow developing across the UK and Low pressure and troughs moving up into the SW later tomorrow.
http://www.wetterzentrale.de/pics/Rtavn001.gif
MODELS-2 WEEK HEADLINE Becoming unsettled and often windy with rain or showers at times.
THE GFS JET STREAM FORECAST The GFS Jet Stream Forecast shows the flow ridged well to the North of the UK currently but over the coming days it is scheduled to realign to the South of the UK at the same time as strengthening markedly. It then returns on a NE'ly course across the Uk for much of next week before slackening somewhat through Week 2 for a time but the axis of it never moving far enough away to the NW to eliminate the UK being under the influence of Atlantic Low pressure.
http://www.netweather.tv/index.cgi?action=jetstream
GFS OPERATIONAL The GFS Operational Run today shows a deteriorating weather pattern across the UK as Low pressure moves up from the SW late tomorrow and through the weekend and persists in one shape or form over the UK for the following 10 days or so. This will bring spells of strong winds and rain interspersed with showery interludes and temperatures no better than average. It takes until Day 12 to obtain a ridge which would promise the South a temporary dry interlude for a couple of days before Atlantic Low pressure returns by the end of the period.
http://www.wetterzentrale.de/pics/Rtavn1441.gif
http://www.wetterzentrale.de/pics/Rtavn3841.gif
THE GFS CONTROL The theme of the GFS Control Run this morning is very similar over Week 1 but is rather kinder in Week 2 as more influence of higher pressure to the SE keeps the rain more concentrated towards the North and West in the second week with the drier weather extending to other areas too at the end of the period as High pressure crosses England and Wales from the SW.
THE GFS CLUSTERS(14 Days) The GFS Clusters this morning show 45% of members with Low pressure to the West in 14 days time with rain at times especially in the West. The remaining 55% of members show a variety of options ranging through High pressure to the South (25%) High pressure to the NE with 'Col' conditions across the UK (25%) and 5% with a rasping Northerly with a deep Low over Scandinavia.
http://www.weatheronline.co.uk/cgi-bin/expertcharts?LANG=en&MENU=0000000000&CONT=euro&MODELL=gefs&MODELLTYP=2&BASE=-&VAR=cpre&HH=372&ZOOM=0&ARCHIV=0&RES=0&WMO=&PERIOD=
UKMO UKMO today shows a cocktail of Low pressure areas revolving around the UK through next week in very unstable, unsettled and often windy weather with temperatures near average.
http://www.wetterzentrale.de/pics/Rukm1441.gif
THE FAX CHARTS The Fax Charts this morning show Low pressure taking control of the weather across the UK from the start of the weekend with troughs crossing all areas from the SW and being reinforced by more early next week when windy weather is shown to become a feature too.
http://www.weathercharts.org/ukmomslp.htm#t120
GEM GEM today shows the unsettled weather too beginning tomorrow evening in the SW and extending to all areas soon afterwards. The rest of the period is shown to be unsettled and windy with heavy rain at times especially in the West while the SE may see some reduction in rainfall later next week as High pressure brushes by over the near continent setting up warm and humid conditions for a time.
http://www.wetterzentrale.de/pics/Rgem2401.gif
NAVGEM NAVGEM looks very unsettled this morning as Low pressure moves in from the SW and makes the UK it's resting place for much of next week with rain and showers for all in sometimes strong winds and average temperatures.
http://www.wetterzentrale.de/pics/Rnvg1681.gif
ECM ECM this morning looks very similar to the majority of the output this morning bringing deep Low pressure areas up from the SW and across all areas over the next week. A lot of rainfall is possible in places and some for all though later next week could see drier and humid conditions affect the East and SE for a time as the heaviest rain remains across the West and NW.
http://www.wetterzentrale.de/pics/Recm2401.gif
ECM 10 DAY MEAN The ECM 10 Day Mean Chart from last night shows a slightly better prospect as Low pressure appears to have retreated further to the NW in the preceding days enabling drier weather to affect the South and East at times while the North and West maintains the more unsettled theme with rain at times.
http://www.wetterzentrale.de/pics/Reem2401.gif
NOTABLE TREND CHANGES FROM PREVIOUS RUNS The models maintain their theme of High pressure migrating East away from the UK later next week with a return to more unsettled Atlantic winds thereafter. It also indicates that a temporary better period of weather could affect the SE and East late next week.
31 DAY HISTORICAL VERIFICATION STATS FOR GFS, UKMO & ECM The Verification Statistics of GFS, UKMO and ECM show at 24 hours ECM leads UKMO at 99.3 pts to UKMO's 99.2 pts with GFS coming in third at 99.2 pts. At 3 days ECM and UKMO are at 95.9 pts while GFS lags behind at 95.0 pts. At 5 days UKMO is king at 85.1 pts followed by ECM at 84.7 and GFS at 82.1 pts. Then at 8 Days ECM still leads at 58.6 pts over GFS's 50.2 pts. Finally at Day 10 ECM leads GFS at 38.3 pts to 33.9 pts from GFS.
http://www.emc.ncep.noaa.gov/gmb/STATS_vsdb/allmodel/daily/cor/cor_day1_PMSL_MSL_G2NHX.png
http://www.emc.ncep.noaa.gov/gmb/STATS_vsdb/allmodel/daily/cor/cor_day3_PMSL_MSL_G2NHX.png
http://www.emc.ncep.noaa.gov/gmb/STATS_vsdb/allmodel/daily/cor/cor_day5_PMSL_MSL_G2NHX.png
http://www.emc.ncep.noaa.gov/gmb/STATS_vsdb/allmodel/daily/cor/cor_day8_PMSL_MSL_G2NHX.png
http://www.emc.ncep.noaa.gov/gmb/STATS_vsdb/allmodel/daily/cor/cor_day10_PMSL_MSL_G2NHX.prig
MY THOUGHTS We are staring down the barrel of a marked unsettled and eventually windy period of early Autumn weather as the High pressure of this week becomes a distant memory by Saturday. The SW looks first to see this change with some rain marching in later tomorrow and over the weekend this extends North and East to all areas followed by brighter and more showery conditions for a time. It's the second phase of rain later Sunday and through next week which looks moreominous as this could be accompanied by strong winds and gales in places as a depression deepens as it moves North over the UK on Monday. This sets up a complex system of Low pressure over and around the UK with further spells of rain and showers along with blustery winds throughout the rest of next week. In amongst all this gloom is hope of a better period of weather across the SE and East late next week and the second weekend as High pressure over the near continent could ward off the worst of the Low pressure out to the West and NW and send some warm and humid conditions up across the South and East for a while. The charts showing this are marginal though and in any event it hints that Low pressure would return again to all after a few days to end the period unsettled for all with further rain. So it's basically make the most of this week's fine weather which in itself has been something of a disappointment for many because from saturday onward it will either be raining or rain will never be far away with strong winds to boot at times next week too. Amounts of rain do look greater than any charts I have seen for some considerable while and while widespread problems do not seem likely the water table could become quite high by the end of next week if the Low pressure areas are as persistent and active as some charts show today, this most likely in the West and SW.
BEST CHART OF THE DAY 00z RUN
http://www.wetterzentrale.de/pics/Rtavn001.gif
In selecting the best Chart of the Day there is a measure of how poor conditions will be at times over the next few weeks as the best chart I can find is the current midnight last night one showing High pressure warding off an Atlantic attack for now in a warm SE feed and dry weather for all..
WORSE CHART OF THE DAY 00z RUN
http://www.wetterzentrale.de/pics/Recm1201.gif
For the worst chart of the day I could of selected quite a few but opted for this one from ECM at Day 5 with the UK engulfed by active Low pressure with the one to the West affecting the UK in the days that follow. This chart is notable for me as it offers no easy way out of unsettled weather over the UK in the following days.
Next update from 09:00 Friday Sep 11th 2015
Edited by user
10 September 2015 08:14:45
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Reason: Not specified
Martin G
Kilmersdon Radstock Bath Somerset