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 TUESDAY MARCH 31ST 2015.
THE CURRENT GENERAL SITUATION A strong WNW flow will blow across the UK today before weakening slowly tonight ahead of a warm front approaching from the SW tomorrow.
http://www.wetterzentrale.de/pics/Rtavn001.gif
MODELS-2 WEEK HEADLINE The changeable and sometimes windy spell will be replaced by drier and more settled conditions from the Easter weekend.
THE GFS JET STREAM ENSEMBLE FORECAST The Jet Stream forecast indiciates the current West to East flow across the UK will turn more NW to SE or even North to South as the flow buckles north over the Eastern North Atlantic. thereafter there is some indication that the flow will rejuvenate to the South of the UK but there is a lot of uncertainty surrounding where the flow will lie the further out into the outlook we go this morning.
http://www.netweather.tv/index.cgi?action=jetstream
GFS OPERATIONAL The GFS Operational this morning shows a strong Westerly flow across the UK through the next 24 hours or so before the winds decrease as High pressure edges closer from the SW. However, a further trough moves across from the West on Thursday with the decay of that indicating a change to High pressure based weather from then on. In this run after a few days of the High based very near or over the UK the High looks like migrating to somewhere North and NE of the UK with some unsettled and cold weather encroaching across the Southlooking possible from this run later.
http://www.wetterzentrale.de/pics/Rtavn1441.gif
http://www.wetterzentrale.de/pics/Rtavn3841.gif
THE GFS CONTROL The GFS Control Run shows similar easing in the Westerly flow through the rest of this week as the next trough on Thursday looks like the last for the time being before High pressure develops across the UK over the second half of the Easter Weekend. thereafter the run indicates High pressure very much in control of the weather over the UK through the second half of the run with fine and dry weather with sunny spells but temperatures probably little better than average with some frosts at night.
THE GFS CLUSTERS The GFS clusters show little indication of certainty as to where we will lie synoptically two weeks from today with an equal share of several evolutions ranging from a chilly showery Northerly or a more quiet and anticyclonic based pattern with the centre of High in one of several different options.
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 stalling cold front crossing slowly East on Thursday as pressure builds across the UK from Scandinavia over the start of the Easter weekend. Rain on Thursday and perhaps Good Friday looks like dying out leaving the UK rather chilly and cloudy but dry by Easter Sunday.
http://www.wetterzentrale.de/pics/Rukm1441.gif
THE FAX CHARTS The Fax Charts follow the course of the raw data with the troughs of Low pressure moving into the UK from the west towards Easter weakening and decaying as High pressure builds through them over the Easter weekend.
http://www.weathercharts.org/ukmomslp.htm#t120.
GEM GEM today becomes very High pressure driven over the UK from Easter with the current unsettled, windy and changeable weather being replaced by fine and dry weather with slowly increasing amounts of sunshine and probably temperatures too as we move through next week.
http://www.wetterzentrale.de/pics/Rgem2401.gif
NAVGEM NAVGEM is quite tentative in it's build of High pressure across the UK, taking until early next week to completely eliminate the risk of a few showers from the South of the UK with the close of the run joining forces with the other models in settling the weather down with sunny spells developing.
http://www.wetterzentrale.de/pics/Rnvg1681.gif.
ECM ECM continues to show improvements taking shape at the weekend as the Atlantic Jet flow and bandwagon weakens. High pressure is shown to build through the UK by Easter Sunday with the start of next week then largely dry with variable cloud cover but unspectacular temperatures.
http://www.wetterzentrale.de/pics/Recm2401.gif
ECM 10 DAY MEAN(12z) The ECM 10 Day Mean Chart shows High pressure well in control of the UK weather in 10 days with a centre close to or over the UK.
http://www.wetterzentrale.de/pics/Reem2401.gif
NOTABLE TREND CHANGES FROM PREVIOUS RUNS The models continue to show a trend towards High pressure based conditions from around Easter lasting through most if not all of Week 2.
31 DAY HISTORICAL VERIFICATION STATS FOR GFS, UKM & ECM The current verification statistics for the past 31 days shows ECM leading the way at 3 days with 97.8 pts followed by UKM at 97.4 pts and GFS at 96.7. At 5 days ECM continues to lead the field at 91.2 pts over UKMO at 90.6 pts and GFS at 88.3. At 8 days ECM remains the leader with 68.5 pts over GFS's 63.6 pts. Then at Day 10 ECM retains superiority at 48.9 pts over GFS at 46.6.
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 The pattern shown within all the models this morning closely resemble the pattern shown by yesterdays output with just small but subtle differences in positioning of High pressure determining small scale weather differences in any one place across the UK from early next week. The basic pattern is that the current strong and blustery West or NW winds die away by the middle of the Easter holiday along with the attendant rain and showers. High pressure then looks like forming over the top of the UK by the end of Easter but with a lot of residual cloud left across the UK from decayed troughs there may not be much sunshine and temperatures are likely to be suppressed as a result. Then next week we have to try to pin down where the High pressure area sits or migrates too with a whole array of options shown this morning which could have subtle differences to the way things feel at the surface and confidence on any one option occurring is unusually low this morning. A fair amount of options most notably from GFS shows it migrating North which is not good as it could set up a cold feed from Europe and allow fronts to encroach from the SW- a mouth watering pattern for snow lovers in a mid Winter month but pretty unwelcome in April from the point of view of cold rain and temperatures becoming possible. However, other output shows the High slipping South, West or just revolving around the vicinity of the UK with much more benign conditions if the latter happens with increasing amounts of sunshine and moderate warmth but frosts by night. Wherever the High ends up the vast majority of output is stating that we can look forward to a cessation of the current strong winds and spells of rain and showers to a much more useable weather pattern in which we may not be breaking any records temperatures wise but be able to pursue outside activities in the knowledge that conditions are unlikely to be rained off.
Issued at 08:00 Tuesday March 31st 2015
Martin G
Kilmersdon Radstock Bath Somerset