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 WEDNESDAY APR 6TH 2016
THE CURRENT GENERAL SITUATION A cool NW flow over the UK will weaken as a weak trough clears SE over England this afternoon with an area of slack pressure ahead of an occluded front approaching Western and SW Britain later tomorrow.
http://www.wetterzentrale.de/pics/Rtavn001.gif
CURRENT SNOW FORECAST AND FREEZING LEVEL OVER THE UK The freezing level across the UK will remain below average for this time in April hovering around the 3000ft mark for much of the time though rising briefly across the SW later tomorrow before falling to as low as below 2000ft behind an occlusion on Saturday. As a result some snowfall is expected in showers above 1000ft today and possible 600ft on Saturday in the West.
http://www.snow-forecast.com/maps/dynamic/uk
http://www.natice.noaa.gov/pub/ims/ims_gif/DATA/cursnow.gif
MODELS-2 WEEK HEADLINE Unsettled with showers or spells of rain with some brighter spells too especially over the North. Near average or slightly below average temperatures. Perhaps warmer later in the SE.
THE GFS JET STREAM FORECAST The Jet Stream is shown to maintain a trough or circulation to the South of the UK over the next week to 10 days with the Jet flow only slowly recovering it's way Northwards in a NE flow over the UK at the end of the period.
http://www.netweather.tv/index.cgi?action=jetstream
GFS OPERATIONAL The GFS Operational Run today shows a lot of cyclonic conditions across the UK over the first week. With Low pressure to the SW the UK will be subject to areas of rain and showers moving up from the SW periodically with some quite chilly conditions across the North. Then from the beginning of Week 2 the unsettled and cool conditions will slowly give way to drier and brighter weather especially towards the South and East with the unsettled weather restricted towards the North and West by the end of the period.
GFS CONTROL RUN The GFS Control Run is less optimistic in the second week as Low pressure after a brief lull re-invigorates and moves across the UK from the West with rain and showers for all still with just a hint of better weather moving in from the West and SW right at the end of the period.
http://www.wetterzentrale.de/pics/Rtavn1441.gif
http://www.wetterzentrale.de/pics/Rtavn3841.gif
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 GFS Clusters today show a Low pressure bias again at Day 14 though positioning and influence to what areas is harder to interpret with a 20% cluster indicating a more High pressure based pattern at that point with drier and quieter conditions as a result.
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 Low pressure a little less influential as we move through the start of next week as it's positioning seems further to the SW than on previous runs and while some rain and showers is likely across the South and SW in particular some dry and breezy weather is likely in the North where it will feel cool. This period of relatively unsettled conditions then looks like continuing as we move towards the second half of next week.
http://www.wetterzentrale.de/pics/Rukm1441.gif
THE FAX CHARTS The Fax Charts show Low pressure setting up shop down to the SW of the UK over the weekend and start to next week with rain and showers spilling North across the UK from time to time occasionally accompanied by strong and cool SE winds while some warmer brighter periods also look possible especially towards the East and North.
http://www.weathercharts.org/ukmomslp.htm#t120
GEM GEM today continues it'e recent pattern of maintaining it's unsettled feel throughout the next 10 days with Low pressure dominant down to the SW at first then after a brief respite towards the middle of next week we see further Low pressure across the UK later which will maintain an unsettled and sometimes cool feel to conditions with rain and showers for all right out to day 10.
http://www.wetterzentrale.de/pics/Rgem2401.gif
NAVGEM NAVGEM today also maintains a very unsettled outlook with Low pressure down to the SW influential throughout. Rain or showers would be the order of the day with some longer spells of both wet and drier conditions for all the latter especially in the early part of the week in the North while by the end of the run all areas look at risk of some strong winds and rain.
http://www.wetterzentrale.de/pics/Rnvg1681.gif
ECM ECM shows largely unsettled conditions continuing over the next week as Low pressure slips South to lie to the SW of the UK. Rain and showers can be expected for all through this period through the far NE may see the least of this while it is cold in a raw East wind. Some warmer and drier interludes could occur between the showers in the South. Then towards the end of the period a change in the charts indicate dry and settled conditions under UK based High pressure having developed with sunny spells and the risk of slight night frosts likely should this pattern evolve.
http://www.wetterzentrale.de/pics/Recm2401.gif
ECM 10 DAY MEAN (12z) The 240hr mean Chart from last night shows Low pressure further to the West and SW than of late at 10 days with resultant milder Southerly winds and rain or showers restricted towards the South and West rather than elsewhere possible if this develops as shown.
http://www.wetterzentrale.de/pics/Reem2401.gif
NOTABLE TRENDS & CHANGES FROM PREVIOUS RUNS A changeable and Low pressure driven period of weather for all is maintained from the models once more this morning though there is a trend towards improvements later.
31 DAY HISTORICAL VERIFICATION STATS FOR GFS, UKMO & ECM The verification Statistics of GFS, UKMO and ECM show at 24 hours ECM ahead at 99.6 pts with UKMO at 99.5 pts and GFS at 99.4 pts. At 3 days ECM is leading with 97.6 pts to UKMO's 97.2 pts while GFS lags behind at 96.1 pts. At 5 days ECM leads with 90.2 pts to UKMO at 88.9 pts and GFS at 85.5 pts. Then at 8 Days ECM has the leading spot from GFS with 66.0 pts to 61.3 pts. Finally at Day 10 ECM has the lead from GFS with a score of 44.8 pts to 41.4 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 There are slow changes shown within the output again this morning but at least such changes do appear to be leaning towards somewhat better conditions over all developing late in the period. If these improvements are to verify we have to lose the deep trough expected to develop down to the SW of the UK in a few days time where it looks in no hurry to move from for some considerable time. Nevertheless, some output has placed this feature a little more to the SW today and if this is so some warmer continental air may be allowed to filter across the South at times with less in the way of rain and showers too away from the SW. It looks like the North will stay cool under an Easterly feed, particularly so in the far NE. Then as the Lo to the SW fills somewhat it still looks possible for it to be re-invigorated by another tongue of cold air moving SW from Norway and engaging in the Low pressures circulation to the SW and creating a resurgence of wet and unsettled conditions at times later next week. However, having said that ECM has moved away from this theme and splitting Low pressure to the SW and NE then with High pressure which would settled things down nicely next weekend. Other output too show the chance of lifting Low pressure towards the NW which would give rise to another route to rather better weather across the South and East with milder air in tow. So in summary while some improvements are shown today it needs all the jigsaw pieces to fall in the right places for it to verify and with still a lot of cool and unstable air around on the charts this morning we may well have to be patient for marked improvements in the overall pattern to develop. However, it is April and any sunshine will make all the difference to how things feel and while unsettled remains the nature of this morning's report it's not all doom and gloom and quite normal for this time in Spring
Next Update Friday April 8th 2016 from 09:00
Martin G
Kilmersdon Radstock Bath Somerset