HERE IS MY LATEST ANALYSIS USING DATA SUPPLIED BY THE NWP OUTPUT COVERING 5 OF THE WORLDS MOST POWERFUL WEATHER COMPUTERS ISSUED AT 08:00 ON FRIDAY JUNE 5TH 2015.
THE CURRENT GENERAL SITUATION A trough of Low pressure will move East across the UK today followed by a fresher Westerly airflow for a time as pressure builds from the West tomorrow.
http://www.wetterzentrale.de/pics/Rtavn001.gif
MODELS-2 WEEK HEADLINE Gradually becoming more settled with sunny spells and warm conditions for a time especially in the West befoe a more showery interlude develops by next weekend.
THE GFS JET STREAM FORECAST The GFS Jet Stream Forecast shows the flow blowing North over the UK currently. This turns to a more West to East flow as it moves North over the weekend and sets up North of the UK for a time next week. Later in the run the flow reignites in a SE flow from the Atlantic over Western Britain to NW Europe as a trough of Low pressure develops near the UK.
http://www.netweather.tv/index.cgi?action=jetstream
GFS OPERATIONAL The GFS Operational today looks less optimistic from a High pressure poin of view as after a spell of cool NE winds over the South and a lighter North drift over the North pressure falls through the middle of next week with showers developing to leave the second week with Low pressure over or close by to the UK either from a Northerly source and later a westerly one delivering spells of rain and showers in indifferent temperatures through the second half of the period.
http://www.wetterzentrale.de/pics/Rtavn1441.gif
http://www.wetterzentrale.de/pics/Rtavn3841.gif
THE GFS CONTROL The GFS Control run shows a different theory of arriving at the same place with a period of cool and bright weather under High pressure just to the west of the UK giving way to cool and unsettled, showery weather fuelled by a col upper pool of air to the SE by midweek next week and developing a Low pressure which delivers unsettled conditions off and on for the rest of the period with a short period of more settled conditions at the start of the second week before low pressure close to the SE returns cool and showery weather across the South and east once more.
THE GFS CLUSTERS The GFS Clusters today show the likelihoods of a trough of Low pressure close to the UK in 14 days time quite high with High pressure migrated more to the SW. There are a few members who cling on to High pressure closer by to the UK and also a few who show something even less wholesome than the majority pack this mroning.
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 this morning looks rather better than GFS with High pressure close to the West early in the week with a relatively cool air mass over the UK slowly giving way to warmer conditions especially over the South as the High is shown to stradlle Northern Britain midweek with a warmer Easterly continental feed affecting the South in maintained dry and settled conditions.
http://www.wetterzentrale.de/pics/Rukm1441.gif
THE FAX CHARTS The Fax Charts show High pressure west of Ireland well in control in the latter stages this morning with a cool NE flow over the South and generally fine conditions for all.
http://www.weathercharts.org/ukmomslp.htm#t120.
GEM GEM today also shows High pressure controlling the UK weather over the next week building in from the West over the weekend. A cool NE feed affects the South for a time before the ridge largely cuts this flow off towards midweek. Then pressure is shown to leak away as the High recedes away West and SW with Low pressure to the North extending cool air and a slack unstable and potentially showery Northerly airflow developing across all areas by the end of the run.
http://www.wetterzentrale.de/pics/Rgem2401.gif
NAVGEM NAVGEM clings on to the High pressure area to the west of the UK with it's ridge across the Britain until the end of next week at least with the same weather pattern as the other models shown to occur through the week. The end frames of the run do show a slow fall of pressure at the end of the run with a NW flow becoming established across the UK by next weekend.
http://www.wetterzentrale.de/pics/Rnvg1681.gif.
ECM ECM looks like going the same way as much of the output this morning with High pressure early next week keeping things dry if never overly warm before pressure falls later with showers developing, first towards the SE then elsewhere too as Low pressure troughs feed across Britain from the NW too later next week. The end days of the run do show an improvement again as High pressure reuilds from the SW.
http://www.wetterzentrale.de/pics/Recm2401.gif
ECM 10 DAY MEAN The ECM 10 Day Mean Chart continues it's slow decline from run to run as it brings a slow return of a Low pressure trough close to or over the UK with at least the risk of showers in largely average temperatures by Day 10.
http://www.wetterzentrale.de/pics/Reem2401.gif
NOTABLE TREND CHANGES FROM PREVIOUS RUNS The trend has very much swung towards a more unsettled and showery interlude at least to develop across the UK late next week.
31 DAY HISTORICAL VERIFICATION STATS FOR GFS, UKMO & ECM The current verification statistics for the past 31 days shows ECM leading the way at 3 days with 96.7 pts followed by UKM at 95.5 pts and GFS at 95.1. At 5 days ECM leads GFS with 85.2 over GFS's's 81.3 pts with UKMO at 81.2. At 8 days ECM clocks in ahead of GFS at 51.1 over 44.1. Then at Day 10 ECM remains slightly ahead of GFS at 31.7 pts to 22.5 pts.
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 Though the fine weather prospects for the next 7 days remain as were so to speak our thoughts become more and more transfixed towards the increasing spread between the output of a change to lower pressure again from the North or NE late next week or over the weekend as the High to the West declines and recedes back SW or West. The problem seems to arise from a cold pool of air which slips SW over the South late in the weekend or start to next week which no onger slips away South over France and Portugal but returns NE close to the SE as a new born Low pressure area fuelling showers for the SE. At the same time pressure falls elsewhere too and Low pressure, albeit in a largely slack form increases the risk of rain and showers too almost anywhere by the end of next week. Though some warm weather will inevitably be felt for some the mostly NE feed will maintain a cool feel for some with exposure and night's could be unusually cool for early June under clear skies and grass frost cannot be ruled out. Looking further out still into Week 2 the jury remains out on whether the more showery phase is just a blip before High pressure rebuilds such as ECM suggests this morning by Day 10. So with low confidence on anything beyond day 7 we have to work through a High pressure period which although never ideally placed to give high summer weather does at least give a dry and bright period next week with temperatures pleasant by day but cold by night before showers develop later on in the week. Thereafter, more runs are needed on the longer term outlook with a 50/50 chance currently of a pendulum swing towards either continuing showery weather or a return to High pressure based conditions hopefully better positioned next time to deliver more guaranteed warmer weather than next weeks version.
Next update from 08:00 Saturday June 6th 2015
Martin G
Kilmersdon Radstock Bath Somerset