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 THURSDAY OCT 1ST 2015
THE CURRENT GENERAL SITUATION High pressure remains slow moving across the British Isles with the fresh Easterly flow over Southern England decreasing.
http://www.wetterzentrale.de/pics/Rtavn001.gif
CURRENT SNOW LYING UK AND NORTHERN HEMISPHERE There is currently no snow lying in the UK but amounts in NE Russia, Alaska, Greenland along with the mountains of Iceland is increasing now as one would expect.
http://www.snow-forecast.com/maps/dynamic/uk
http://www.natice.noaa.gov/pub/ims/ims_gif/DATA/cursnow.gif
MODELS-2 WEEK HEADLINE Mostly settled and fine at first but more unsettled and windy thereafter with rain or showers at times especially over the North and West.
THE GFS JET STREAM FORECAST The GFS Jet Stream Forecast shows the main arm and core of the flow remaining well to the North for a few more days before it troughs South a long way over the Atlantic and returns NE across the UK next week. It then becomes focused much further South than of late, often across the UK in the association with Low pressure close to the North and NW.
http://www.netweather.tv/index.cgi?action=jetstream
GFS OPERATIONAL The GFS Operational Run today shows the current fine weather deteriorating over the weekend as more cloud develops across the UK. Then through next week a fresh South wind will send warm and moist air North over Britain with troughs edging East slowly. Heavy rain in the West will slowly transfer East over several days opening the door to a more mobile spell of Atlantic West to SW winds and rain at times and temperatures near average or a little below at times across the North later as cooler air feeds down from the NW for a time.
http://www.wetterzentrale.de/pics/Rtavn1441.gif
http://www.wetterzentrale.de/pics/Rtavn3841.gif
THE GFS CONTROL The theme of the GFS Control Run is fairly similar to the operational run with the theme of rain moving East over the UK early next week rather quicker with the theme of rain at times thereafter in a WSW flow and some drier intervals across the South at times. At the end of the period a deep Low pressure moves in across the UK with widespread gales and heavy rain as a result.
http://www.meteociel.fr/modeles/gefs_cartes.php
THE GFS CLUSTERS(14 Days) The GFS Clusters this morning show a 65/35% split in favour of Low pressure in control across the UK in 14 days time in association with a trough either down over the UK from the NW or under an unstable and blustery WSW flow with rain at times, heaviest across the West and 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 UKMO today has moved back towards a much more unsettled and windy period as it shows rain and windy weather moving slowly North and East across Southern and Western areas as early as Monday followed by further Low pressure troughs in association with deep Low pressure across the Eastern Atlantic later next week.
http://www.wetterzentrale.de/pics/Rukm1441.gif
THE FAX CHARTS The Fax Charts this morning show High pressure declining slowly over the next 5 days with troughs ganging up over the Eastern Atlantic by Monday spreading more unsettled weather North and East across the UK from next Monday.
http://www.weathercharts.org/ukmomslp.htm#t120
GEM GEM also shows the fine weather moving away by early next week as a small Low moves across the South from the SW with rain for all and opening the door to an unstable but mild SW flow with further troughs delivering rain and showers at times for all but with some lengthy dry spells developing in the SE with higher pressure remaining ensconced across France.
http://www.wetterzentrale.de/pics/Rgem2401.gif
NAVGEM NAVGEM this morning shows a short decline in conditions across England and Wales early next week as a trough swings NE and delivers rain for all followed by a blustery SSW wind. From then on rain becomes more and more restricted to the far NW again as pressure builds slowly across England and Wales next week in accompaniment of a warm SSW airflow.
http://www.wetterzentrale.de/pics/Rnvg1681.gif
ECM ECM this morning has High pressure in it's present form declining at the weekend as a trough of Low pressure moves SW to NE across England and Wales with a spell of rain for all Monday into Tuesday. A ridge of High pressure midweek returns some fine conditions before the next troughs move similarly NE across the UK with some more rain Wednesday and into Thursday. Pressure then builds SW from rising pressure to the North and NE with a battleground scenario developing between troughs to the SW making only slow and erratic progress NE with rain most likely then across the South and West. Temperatures look largely close to average or a little above in the sun shines and in the South.
http://www.wetterzentrale.de/pics/Recm2401.gif
ECM 10 DAY MEAN The ECM 10 Day Mean Chart from last night continues to promote Low pressure to the NW but has taken further to the NW reducing the effects of the rain at times SW'ly flow more concentrated towards the North and West rather than elsewhere
http://www.wetterzentrale.de/pics/Reem2401.gif
NOTABLE TREND CHANGES FROM PREVIOUS RUNS The models still show little consistency in the way conditions will unfold once the current High pressure declines and the trough early next week moves into the UK from the SW. 31 DAY HISTORICAL VERIFICATION STATS FOR GFS, UKMO & ECM The Verification Statistics of GFS, UKMO and ECM show at 24 hours ECM ahead of UKMO at 99.5 pts to 99.4 with GFS closely behind at 99.3 pts. At 3 days ECM is leading with 96.7 pts to UKMO's 96.6 pts while GFS lags behind at 95.6 pts. At 5 days ECM leads with 87.1 pts to UKMO at 86.9 pts then GFS at 84.2 pts. Then at 8 Days ECM still leads at 58.5 pts over GFS's 53.9 pts. Finally at Day 10 GFS just leads ECM at 36.0 pts to 35.4 pts from GFS.
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 models remain focused on bringing an end to the recent fine and sunny weather as High pressure declines over the weekend and is replaced by a trough moving up from the SW on Monday. What is less clear is how the weather evolves from that point on with the majority show this feature opening the door to a lengthy period of SSW winds and rain at times focused chiefly towards the West and North but by no means exclusively. There is some deviation from this with rain becoming more focused to the NW as pressure builds from the SE ala ECM and NAVGEM. ECM too has it's own version of a non straightforward pattern setting up a build of pressure to the NE later which sets up a blocking pattern which hinders troughs to the SW from making much in the way of progress NE across the UK. GFS also has variability within a general similar theme between it's operational and Control Run focusing on a trend to push the worst of conditions up to the NW while the GFS Control Run shows a major storm system at the end of the period with rain and gales for all. So which one is right? Well I think the pattern will remain unresolved until late this weekend at the earliest when a clearer handle on the progress of more unsettled weather next week should be agreed better between the models. The only constant is that we are unlikely to see the largely cloudless skies of this week next week as cloud will often be a major player, rain or not. Temperatures on the other hand are expected to remain on the higher side of average if any SSW flow next week develops with night's especially being much warmer. However, with the exception of the deep Low shown by the GFS Control Run in the far reaches of the run there is again nothing too alarmist to worry about in the weather anywhere across the UK over the next 10-14 days with just modest mid Autumn conditions for the most part.
WORST CHART OF THE DAY 00z RUN
http://www.meteociel.fr/modeles/gefs_cartes.php?code=0&ech=360&mode=0&carte=0
The accolade of the worst chart of the day today goes to the GFS Control Run at 360hrs as it shows a major storm system across NW Britain with heavy rain and gales for all.
BEST CHART OF THE DAY 00z RUN
http://www.wetterzentrale.de/pics/Recm241.gif
The best chart of the day illustrates how synoptics deteriorate over the coming period as the best chart I can fine this morning belongs to the ECM 24 hr chart with the current large High pressure area holding on across the UK continuing to ward off any rain bearing attacks from the Atlantic or elsewhere with warm uppers aloft and good temperatures at the surface by day
Next update from 09:00 Friday Oct 2nd 2015
Martin G
Kilmersdon Radstock Bath Somerset