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 THURSDAY MAY 14TH 2015.
THE CURRENT GENERAL SITUATION A depression will move ESE across Southern England and the English Channel through today with a ridge of High pressure following tonight.
http://www.wetterzentrale.de/pics/Rtavn001.gif
MODELS-2 WEEK HEADLINE Changeable with some showers at times especially over the North and East but spells of dry and fine weather too for all. Generally rather cool, especially by night.
THE GFS JET STREAM ENSEMBLE FORECAST The Jet Stream axis will move gently North tomorrow and over the weekend to be travelling East across Northern Scotland. Then it eases back South as a UK trough is formed and realigns a long way South at the base of a trough late next week before breaking up and gradually returning North up the Western side of the UK two weeks from now.
http://www.netweather.tv/index.cgi?action=jetstream
GFS OPERATIONAL The GFS Operational this morning shows High pressure to the SW over the weekend gradually losing control of the UK weather as Low pressure to the North of the UK slips South across and just to the East of Britain. Showers and outbreaks of rain in cool weather seems likely for all areas for a large porton of the run before Low pressure develops strongly over the Atlantic reversing winds to a more Southerly wind and milder weather spreads North and East across the UK with rain restricted to the North and West.
http://www.wetterzentrale.de/pics/Rtavn1441.gif
http://www.wetterzentrale.de/pics/Rtavn3841.gif
THE GFS CONTROL The GFS Control run this morning follows a very similar path through the first 10 days of the run before High pressure is shown to build across the UK in 14 days time with fine and dry weather for all by then.
THE GFS CLUSTERS The GFS Clusters are very High pressure based this morning with High pressure shown by many members to lie across or just to the West or NW of the UK with fine weather as a result. Just 20% of members indicate an Atlantic influence affecting the North and West of Britain in 14 days.
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 this morning shows a cool and showery trough moving South over the UK early next week with High pressure lying close to the West of the UK by next Wednesday with fine and bright if never overly warm weather to all areas by then with the best weather in the SW.
http://www.wetterzentrale.de/pics/Rukm1441.gif
THE FAX CHARTS The Fax Charts follow the theme of the raw data charts in as much as High pressure to the SW keeps the weather largely fine if rather cloudy at times over the weekend across the South whereas the North sees occasional rin from Atlantic troughs. These slip South across the UK at the beginning of next week.
http://www.weathercharts.org/ukmomslp.htm#t120.
GEM GEM this morning shows a similar drift into cool and showery territory next week as Low pressure slips SE across all areas in the shape of a trough and then quickly followed by another one to maintain the cool and showery theme well out towards the end of the month when rather better conditions look like developing then.
http://www.wetterzentrale.de/pics/Rgem2401.gif
NAVGEM NAVGEM makes rather less of the longevity of the trough next week as High pressure moves in off the Atlantic later next week. So after several cool days with showers dry and warmer weather with some sunshine could be affecting all areas though with chilly nights late next week.
http://www.wetterzentrale.de/pics/Rnvg1681.gif.
ECM ECM indicates a largely cool and showery theme as we move through next week and the start of the Bank Holiday weekend as Low pressure areas slip SE across or to the NE of the UK with cool and showery NW winds affecting all areas with the least showers towards the SW but temperatures never very inspiring anywhere especially at night when touches of frost remain a possibility.
http://www.wetterzentrale.de/pics/Recm2401.gif
ECM 10 DAY MEAN The ECM 10 Day Mean Chart from last night shows High pressure to the SW of the UK still badly positioned for the UK while Low pressure remains locked to the North and NE of Britain with cool air enveloping the UK in NW or West winds and showers.
http://www.wetterzentrale.de/pics/Reem2401.gif
NOTABLE TREND CHANGES FROM PREVIOUS RUNS The trends mostly remain in agreement although with a few exceptions on cool NW winds and occasional showers across the UK for the extended outlook period this morning.
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 96.8 pts followed by UKM at 96.1 pts and GFS at 95.3. At 5 days ECM leads UKMO with 86.0 over UKMO's 84.3 pts with GFS at 82.4. At 8 days ECM remains the leader with 53.4 pts over GFS's 52.5 pts. Then at Day 10 GFS gains superiority at 34.9 pts over ECM at 34.8.
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 Not much change in the overall theme of the output this morning. The story remains one of a North/South split in conditions at the weekend with the North seeing occasional rain in a Westerly breeze while Southern areas stay largely dry and bright. Then as we move into next week pressure falls for all as cool Low pressure slips South and SE over and to the NE of the UK with increasingly showery and cool conditions as winds veer NW. This pattern then appears to become locked in from much of the output with reinforcements to the pattern arriving from the North in time for the Bank Holiday Weekend. However, there are a few exceptions to this and the GFS Ensembles seem to like the idea of High pressure being close by to the UK in two weeks but whether that would be too late for the Holiday break is open to doubt. Navgem too builds High pressure in quickly later next week with brighter and warmer weather shown as a result. So a few different evolutions shown but all point towards rather chilly conditions in winds from a point between West and North for much of the time dragging cool winds down from the North so temperatures look like never being partiularly high in the near future. However, no large amounts of rain look likely and many parts of the South and West could see a lot of dry and bright weather with the most showers over the North and East in the afternoons. However, those same clearer skies to the South and West leave the door ajar in the risk of some areas receiving unwelcome ground frost at night.
Next update from 08:00 Friday May 15th 2015
Edited by user
14 May 2015 07:58:45
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Reason: Not specified
Martin G
Kilmersdon Radstock Bath Somerset