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 FRIDAY APR 22ND 2016
THE CURRENT GENERAL SITUATION High pressure is receding away to the West of the UK over the next day or so with an occluded front close to Southern Britain moving away South too tomorrow leaving the UK in a protracted cool Northerly airflow across the UK for some considerable time thereafter.
http://www.wetterzentrale.de/pics/Rtavn001.gif
CURRENT SNOW FORECAST AND FREEZING LEVEL OVER THE UK Colder uppers are spreading down from the North across the UK over the next few days with the freezing level falling to as low as 2000-3000ft across all parts of the UK by the end of the weekend. Any showers will fall as snow above 1000ft at times especially across the North and East.
http://www.snow-forecast.com/maps/dynamic/uk
http://www.natice.noaa.gov/pub/ims/ims_gif/DATA/cursnow.gif
MODELS-2 WEEK HEADLINE Becoming colder at the weekend with cool nights and sunshine and showers looking likely with a continuing night frost risk thereafter. Perhaps becoming less cold as we enter May.
THE GFS JET STREAM FORECAST The Jet Stream is in the process of change as the flow becomes directed South across the UK over the next few days. It then remains in situ for the next week under the influence of Low pressure to the East of the UK. Then through the second week the theme is for the flow to back to a West to East flow and later a cyclonic flow as Low pressure transfers to the west of the UK.
http://www.netweather.tv/index.cgi?action=jetstream
GFS OPERATIONAL The GFS Operational Run today shows a sustained cold and showery Northerly flow developing through the coming days and lasting for much if not all of next week. Then the pattern slowly changes passing through a transitional change of shallow and still showery Low pressure close to the UK before ending up with a deep Low developing just to the NW of the UK with wet and windy but less chilly conditions finally arriving towards the end of the second week.
GFS CONTROL RUN The theme of the Control Run is very similar to the Operational in relation to the colder phase of the run with next week and next weekend maintaining a cool and showery feel. However, the run couldn't be different in it's latter stages as on this run High pressure replaces Low pressure crossing the UK and ending to the North with a warmer and continental feed of winds across the UK with a lot of dry and fine condition to end 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 Still very mixed messages from the Clusters today which show a bias of 60/40 in favour of High pressure ruling the roost over the UK in 2 weeks time. There is still a sizeable group though who still prefer a much more cyclonic pattern with rain at times across the UK at the same time point.
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 still shows a cold and showery pattern developing across the UK in the coming days as Low pressure to the east and later NE dominates. Winds will be blowing from between North and NW strongest in the NE where the most frequent showers wintry on hills are expected with the risk of frost at night under any clear skies.
http://www.wetterzentrale.de/pics/Rukm1441.gif
THE FAX CHARTS The Fax Charts today show a Northerly flow becoming established across the UK and far from straightforward as troughs are shown to be pulled South in the flow with cloudier skies and some rain being replaced by the coldest phase of the spell early next week under a more direct cold and showery Northerly by then.
http://www.weathercharts.org/ukmomslp.htm#t120
GEM GEM this morning shows a sustained and cold run this morning with Low pressure to the Northeast or East and then over us for a time later maintaining cool and showery weather under Northerly sourced air throughout the 10 day period with a continued risk of frost at night for many and some snow over the hills at times for some.
http://www.wetterzentrale.de/pics/Rgem2401.gif
NAVGEM NAVGEM N/A at time of issue.
http://www.wetterzentrale.de/pics/Rnvg1681.gif
ECM ECM also shows the cold Northerly intensifying early next week with showers and very cold winds blowing down from the North before the pattern eases later as pressure rises to the South leading to lighter Westerly winds warming things up later and killing off the showers from all but the far North and hopefully limiting the risk of frost much more by the end of the period as rain moves across the North and West under more traditional SW winds.
http://www.wetterzentrale.de/pics/Recm2401.gif
ECM 10 DAY MEAN (12z) The 240hr mean Chart from last night is continuing the theme of the UK gradually lifting out of the cold spell as Low pressure gradually establishes closer to the NW of the UK with winds gradually settling West or SW with rain at times and higher temperatures together with some rain at times especially across the North and West.
http://www.wetterzentrale.de/pics/Reem2401.gif
NOTABLE TRENDS & CHANGES FROM PREVIOUS RUNS Changes in the models remains slow but there is a continuing if by some models a tantalising shift away from the coldest conditions lasting too long this morning as the theme of milder Westerly winds arriving towards the latter part of the period continues to be shown.
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 99.4 pts and GFS at 99.3 pts. At 3 days ECM is leading with 97.2 pts to UKMO's 96.5 pts while GFS lags behind at 95.4 pts. At 5 days ECM leads with 88.4 pts to UKMO at 86.2 pts and GFS at 83.0 pts. Then at 8 Days ECM has the leading spot from GFS with 61.9 pts to 56.0 pts. Finally at Day 10 ECM has the lead from GFS with a score of 43.2 pts to 35.9 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 Today's output shows more of the same in terms of the UK moving into a cold spell of Northerly winds and how we eventually find our way out of the rut late next week or beyond. What we have today is an occluded front across the far South and SW of the Uk today making for it's own injection of cool and rather gloomy weather with some rain while the rest of the UK have another bright and dry day. The rain in the South is then chased away by tomorrow as cold Northerly winds begin to embrace the UK between Low pressure to the East and High to the West. The gradient between these systems then steepens next week with a stronger and unusually chilly spell for late April with a mix of sunshine and showers, falling as snow on hills and where showers don't occur frosts at night are likely widely. It's not until late next week when the cracks begin to appear in this set-up as winds look like backing towards the West or even SW with milder conditions albeit with rain at times developing. However, models like GEM this morning enhance the length of the cold spell throughout the 10 days and it is just one of many options on the table beyond next week. What can be said with some certainty there is no heatwave on the cards any-time soon although with bright sunshine between the showers and the additional hours of daylight we have now it' certainly not all doom and gloom and it maybe that it's just patience that is required before the current synoptic pattern realigns to offer us something rather warmer. Time of course will tell. No report tomorrow or Sunday. Will hopefully be back next Monday with some better news for warm seekers.
Next Update Monday April 25th 2016 from 09:00
Martin G
Kilmersdon Radstock Bath Somerset