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 MAR 29TH 2016
THE CURRENT GENERAL SITUATION A showery SW flow will be maintained across the UK, brisk in the South with a thundery trough moving NE across the South later today.
http://www.wetterzentrale.de/pics/Rtavn001.gif
CURRENT SNOW FORECAST AND FREEZING LEVEL OVER THE UK The freezing level across the UK will be quite low given the time of year at around 2000-3000ft for most, low enough to see wintry precipitation in the form of showers affect the hills of the UK above around 2000ft.
http://www.snow-forecast.com/maps/dynamic/uk
http://www.natice.noaa.gov/pub/ims/ims_gif/DATA/cursnow.gif
MODELS-2 WEEK HEADLINE Changeable with rain or showers at times but some drier spells too.
THE GFS JET STREAM FORECAST The Jet Stream is moving in an Easterly direction across Northern France but later in the week it troughs South as low pressure develops over Spain with a ridge across Southern England. The flow then settles to the NW in a NE'ly direction for a time before many options look likely in Week 2 with the flow ebbing and flowing North and South across the Atlantic and Europe later.
http://www.netweather.tv/index.cgi?action=jetstream
GFS OPERATIONAL The GFS Operational Run today shows a showery few days to come but with the trend towards drier conditions ater in the week as winds fall slack and pressure rises steadily from the SW. A Low pressure trough feeds down from the NW later in the week, weakening as it does and stalling across Central Britain. Through next week it looks like after a dry spell with some sunshine more cool and unsettled conditions spread down from the NW with rain at times and then right at the end of the run slack pressure sets up again with a lot of dry and bright weather for most.
GFS CONTROL RUN The theme of the Control Run is similar to that of the Operational Run through the first week but then a drift away from the Operational through Week 2 as deep Low pressure eventually develops to the North of the UK with a strong mobile pattern of Westerly winds with gales, rain and showers return to all areas again as we move deeper into April.
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 an 85% chance of Low pressure lying over or close to the UK with rain at times for all in cyclonic winds should it verify. The remaining 15% show High pressure to the SW and Westerly winds across the UK with Atlantic troughs likely to just affect the North.
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 a brief drier and brighter interlude towards the end of the week with a ridge of High pressure from the SW responsible. However, a trough to the NW will move SE and stall across Central UK over the weekend while pressure falls gently everywhere resulting in more showery and unsettled weather again for many areas to end the weekend.
http://www.wetterzentrale.de/pics/Rukm1441.gif
THE FAX CHARTS The Fax Charts show a weakening showery airflow across the UK through the rest of this week as pressure builds from the SW. However, it becomes squeezed by a trough moving down from the NW and Low pressure across Europe. The trough is shown to stall across the Central UK with warmer air wafting North across Southern districts for a time at the weekend.
http://www.weathercharts.org/ukmomslp.htm#t120
GEM GEM shows a changeable pattern across the UK in the coming 10 days as the current showery flow weakens in the coming days with a better end of the week for most as a weak ridge pushes across from the SW. Pressure then falls, partly responsible as a trough to the NW weakens and stalls across the Central parts of the UK with Low pressure becoming dominant from Europe and eventually lying across the UK with a very showery end to the period in temperatures no better than average levels.
http://www.wetterzentrale.de/pics/Rgem2401.gif
NAVGEM NAVGEM shows Low pressure sliding SE just to the West of the UK over the weekend with some rain at times, mostly in the West but some for all possible in fairly slack conditions by this time next week.
http://www.wetterzentrale.de/pics/Rnvg1681.gif
ECM ECM this morning shows a ridge of High pressure at the end of the week stretching up from the SW across England but instantly pushing it away SE over the weekend with SW winds and troughs affecting Britain with rain at times for the weekend and start to next week. Then after several days pressure builds again from the SW and this time it's fine weather becomes maintained across the South with troughs affecting the NW of the UK with further rain at times likely late in the period.
http://www.wetterzentrale.de/pics/Recm2401.gif
ECM 10 DAY MEAN (12z) The 240hr mean Chart from last night shows High pressure to the SW and Low pressure to the North with Westerly winds over the UK with rain at times likely for all, as usual in these setups heaviest in the North and West.
http://www.wetterzentrale.de/pics/Reem2401.gif
NOTABLE TRENDS & CHANGES FROM PREVIOUS RUNS A changeable period of weather for all is the main theme from the models this morning.
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 97.3 pts while GFS lags behind at 96.2 pts. At 5 days ECM leads with 89.8 pts to UKMO at 88.8 pts and GFS at 85.6 pts. Then at 8 Days ECM has the leading spot from GFS with 64.9 pts to 58.1 pts. Finally at Day 10 ECM has the lead from GFS with a score of 42.3 pts to 40.6 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 Well after a very volatile Easter weekend with my own experiences very much driven by Storm Katie with large hail, thunderstorms, storm force winds and heavy rain we are looking thankfully at a rather quieter interlude of weather as we move through the rest of this week. Having said that the showery airflow across the UK will weaken only slowly with several more days of heavy showers and sunny spells before drier weather develops thanks to a ridge of High pressure moving up from the SW at the end of the week. The problem is that a trough of Low pressure will be moving down from the NW and pushing the ridge away SE and allowing a SW flow to develop with rain at first restricted to areas around the vicinity of the trough becoming more widespread later as pressure gently falls across the UK. Thereafter, the pattern becomes much less clear with a lot of output suggesting a return to unsettled and showery conditions across the UK as Low pressure is shown in various guises between the models to lie close by backed by ensemble data. It seem the previous anticipations of High pressure building to the North and NE of the UK has become less likely over recent runs which means that with time it maybe that the most rain falls across the North and West with time rather than the South and West. Temperature wise looks somewhat indifferent today and while there maybe some mild air floating about there is also some colder charts shown too with the rest keeping things generally close to average. So in summary while the next week of weather looks fairly reliably stated in this morning's output details are far less clear as we look through the second week although thankfully there looks no repeat of any stormy weather in the South that we experienced down here over Easter Sunday Night. Unfortunately there are equally few signs of anything particularly settled and Springlike shown as yet either.
Next Update Wednesday March 30th 2016 from 09:00
Martin G
Kilmersdon Radstock Bath Somerset