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 TUESDAY MAY 31ST 2016
THE CURRENT GENERAL SITUATION Low pressure over the near continent will push troughs West across England and Wales today and tonight with High pressure remaining centred to the NW of the British Isles with a chilly Northerly breeze in places.
http://www.wetterzentrale.de/pics/Rtavn001.gif
CURRENT SNOW FORECAST AND/OR FREEZING LEVEL OVER THE UK The freezing level and snow forecast is now suspended until the beginning of October.
http://www.snow-forecast.com/maps/dynamic/uk
http://www.natice.noaa.gov/pub/ims/ims_gif/DATA/cursnow.gif
MODELS-2 WEEK HEADLINE Some thundery rain or showers at times but plenty of dry and fine weather too this especially in the NW at first and the SE later. Occasionally warm.
THE GFS JET STREAM FORECAST The Jet Stream is expected to remain very slack over our part of the Northern hemisphere over the next week as the pattern of Low pressure over Europe and High pressure to the North continues. Then through the second week a steady increase in strength of the flow and patterning of the Jet stream develops with a West to east flow developing either across Southern Britain or to the South late in the period.
http://www.netweather.tv/index.cgi?action=jetstream
GFS OPERATIONAL The GFS Operational Run today shows two quite separate weeks in terms of weather with the first week maintaining a theme of Low pressure to the SE and High to the North with an East or NE flow across the UK slowly weakening over next weekend as pressure across the UK becomes even North to South. Then after a period of quiet and settled weather unsettled weather spreads up from the SW across most areas with rain or showers at times and temperatures and winds returning to June averages later as Low pressure lies close by over or to the North of the UK.
http://www.wetterzentrale.de/pics/Rtavn1441.gif
http://www.wetterzentrale.de/pics/Rtavn3841.gif
GFS CONTROL RUN The Control Run looks at odds with the Operational in the second week in as much as it prefers to keep High pressure to the North of the UK then with further thundery showers at times easing up from Europe or the Southwest in generally light winds, humid and warm conditions for many.
http://www.meteociel.fr/modeles/gefs_cartes.php?code=0&ech=144&mode=0&carte=0
http://www.meteociel.fr/modeles/gefs_cartes.php?code=0&ech=384&mode=0&carte=0
GFS ENSEMBLE DAY 14 DATA The clustering today shows a lot of Low pressure weather patterns likely across the UK in two weeks time. The main thrust of this Low pressure shows a centre close to the North with an unstable Westerly or slack flow across the UK. Other scenearios indicate Low pressure in other locations close to the UK.
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 The UKMO model this morning shows slack Low pressure to the SE and High pressure towards the North of the UK. Further Low pressure lies across the Atlantic to the WSW of the UK by the end of the week with a very slack airflow expected to be maintained across the UK with thundery showers or rain at times across the South and East.
http://www.wetterzentrale.de/pics/Rukm1441.gif
THE FAX CHARTS The Fax Charts maintain the pattern of High pressure to the NW and Low pressure over continental Europe over the next 5 days with troughs of Low pressure crossing England and Wales from the East becoming weaker and slow moving late in the week near Southern England.
http://www.weathercharts.org/ukmomslp.htm#t120
GEM GEM this morning shows a slow reversion back towards a more normal pressure pattern across the UK next week with Low pressure moving up to the NW of the UK and fronts taking a more traditional route NE across the UK by then. In the meantime the status-quo of present persists with Low pressure over Europe sending the risk of thundery rain at times across Southern areas before the South and East become warm for a time before the troughs to the North and West take over later.
http://www.wetterzentrale.de/pics/Rgem2401.gif
NAVGEM NAVGEM too shows a slow change towards less in the way of continental Low pressure and swaps it for slack pressure patterns next week with a small pressure gradient across the UK by this time next week. Any rain and thundery showers looks like slowly becoming more restricted towards the far west and NW later as the South and East in-particular becomes warm or possibly very warm.
http://www.wetterzentrale.de/pics/Rnvg1681.gif
ECM ECM today shows another week or so of either NE winds or slack pressure meaning light winds across the UK as the theme of lower pressure to the SE and higher pressure to the NW is maintained. Then as we move through next week a change in the pressure pattern is accomplished as Atlantic Low pressure is finally able to make it's way up to the NW of the UK and spread more traditional spells of wind and rain North and East across the UK by the end of next week with the driest and warmest weather then likely towards the SE.
http://www.wetterzentrale.de/pics/Recm2401.gif
ECM 10 DAY MEAN (12z) The 10 Day mean Chart from last night is not a million miles away from that of this morning's operational 10 day chart as Low pressure is shown to be edging into the West of the UK from the Atlantic with winds swinging South with rain or showers at times especially towards Western Britain.
http://www.wetterzentrale.de/pics/Reem2401.gif
NOTABLE TRENDS & CHANGES FROM PREVIOUS RUNS There seems to be a slow pattern towards a change in the pattern across the UK, probably next week as High pressure to the NW finally begins to give some ground to the Atlantic Low pressure.
31 DAY HISTORICAL VERIFICATION STATS FOR GFS, UKMO & ECM The verification Statistics of GFS, UKMO and ECM show at 24 hours ECM ahead at 99.4 pts with UKMO at 99.3 pts and GFS at 99.2 pts. At 3 days ECM is leading with 97.0 pts to UKMO's 95.6 pts while GFS lags behind at 95.3 pts. At 5 days ECM leads with 87.3 pts to UKMO at 84.5 pts and GFS at 82.2 pts. Then at 8 Days ECM has the leading spot from GFS with 52.2 pts to 46.4 pts. Finally at Day 10 GFS has the lead from ECM with a score of 31.4 pts to 30.1 pts.
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.png
MY THOUGHTS The UK is still locked in this theme of High pressure anchored to the North of the UK and lower pressure over continental Europe. North or NE winds continue to bring the risk of cloud and rain, sometimes thundery in from Europe across the South and East of the UK. Through the remainder of this week it appears that the pressure gradient weakens across the UK by the weekend with slack pressure bringing some thundery showers still especially over the South but quite warm and bright weather as well. Then as we move into next week there seems a growing desire to bring a more traditional pattern across the UK as pressure to the NW falls a little and sufficiently enough to allow Atlantic Low pressure to make it's way slowly NE towards NW Britain finally allowing winds to veer more towards a warm South or SW flow with the emphasis of rain or showers slowly reverting towards the North and West with some warm or very warm weather in the SE. I must stress that this is still not a done deal and there are still some big differences between some of the output on the events of the second week, many of which maintain a lot of Northern High latitude blocking which could in theory result in conditions not dissimilar to those of present and I think it will be well into the second half of this week before the models show any sort of cross model agreement on events beyond next weekend. So in the meantime for many the weather is not too bad with just local nuances revolving around pockets of heavy and thundery rain revolving around Southern Britain and this will continue as long as pressure remains Low over Europe. The NW remains the place to be for the warmest and sunniest conditions for some time yet before we may see the SE claiming that honour next week if the above sequence of events takes place.
Next Update Wednesday Jun 1st 2016 from 09:00
Martin G
Kilmersdon Radstock Bath Somerset