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 MONDAY FEB 29TH 2016
THE CURRENT GENERAL SITUATION A ridge of High pressure across Southern Britain will decline away SE today followed by troughs of Low pressure in a strengthening West or SW wind through the day and overnight. Following a cold front East over the UK tomorrow a cold and showery Westerly flow will develop.
http://www.wetterzentrale.de/pics/Rtavn001.gif
CURRENT SNOW FORECAST AND FREEZING LEVEL OVER THE UK The freezing level across the UK will lift from the West through the day with values exceeding 5000-6000ft tonight before falling again towards 2000ft later tomorrow with early snow over Northern hills and mountains turning to rain but returning to many hills again tomorrow in the form of showers.
http://www.snow-forecast.com/maps/dynamic/uk
http://www.natice.noaa.gov/pub/ims/ims_gif/DATA/cursnow.gif
MODELS-2 WEEK HEADLINE Rather cold and breezy with rain or showers at times with snow on hills. Temperatures mostly rather below average with frosts at night in places.
THE GFS JET STREAM FORECAST The Jet Stream is predicted to blow SE across the Atlantic and France over the coming week with a deep trough across the UK by next weekend with this pattern only slowly reducing to more of a West to East pattern though still blowing quite a way further South than average through the second week.
http://www.netweather.tv/index.cgi?action=jetstream
GFS OPERATIONAL The GFS Operational Run today shows mostly rather cold and unsettled conditions likely across the UK this week with winds from a West or NW direction driving wintry showers and some longer periods of rain or sleet with hill snow East and SE across all areas through the period. Then as we move through the second week changes are slow with the weather remaining rather cold and changeable for many with rain at times with further snowfall and strong winds affecting the North in particular at times.
GFS CONTROL RUN The Control Run's theme follows a similar course as the Operational through the first week with a lot of chilly West or NW winds and wintry showers with snow on fairly modest hills nationwide at times. The coldness if anything enhances next weekend as Low pressure just to the East swings winds Northerly. Then through the second week the run diverges a little from the Operational with a milder but still damp period under West or SW winds before pressure builds to the East and encourages trough disruption across the UK at the end of the run with rain at times along with chillier conditions.
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 strong support for High pressure to lie across the UK in 14 days time as the clusters suggest a 75%/25% split towards this scenario. The remaining 25% show Low pressure from the West bringing rain at times in a milder SW'ly flow more likely.
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 is a very chilly one for March as Low pressure areas moving SE over or to the NE of the UK later this week culminate in a complex Low pressure area over and just to the East of the UK at the weekend with Northerly winds and wintry showers the order of the days with frosts at night in shelter
http://www.wetterzentrale.de/pics/Rukm1441.gif
THE FAX CHARTS The Fax Charts today show the complexities of the SE moving fronts and depressions towards the UK later in the week and how it engages with cold air from Northern latitude sources later in the week too with a mixture of rain, wind and wintry showers in quite cold conditions relative to March.
http://www.weathercharts.org/ukmomslp.htm#t120
GEM GEM today shows a similar pattern to the rest of the output with a chilly week to come with rain and showers turning wintry across hills over all parts of the UK. Once to the East of the UK the Northerly down across the UK persists for several days next weekend before a ridge of High pressure ridging NE across the UK next week dries things up with sharp overnight frosts.
http://www.wetterzentrale.de/pics/Rgem2401.gif
NAVGEM NAVGEM today shows the rather cold and unsettled theme too with cold winds from the NW and then North next weekend ensuring rain and showers at times throughout the period turning to snow at times on hills nationwide at times especially later as further Low pressure disrupts SE across the UK at the weekend.
http://www.wetterzentrale.de/pics/Rnvg1681.gif
ECM ECM this morning shows cold and unsettled and windy conditions for all of the UK over the next week with rain and snow at times across the UK, the snow mostly but not exclusively over the hills. Then after a cold and wintry weekend with snow showers in places the pattern flattens next week with High pressure to the South and Low pressure to the North bringing milder Westerly winds across the UK with rain at times particularly to the North with longer drier spells across the South.
http://www.wetterzentrale.de/pics/Recm2401.gif
ECM 10 DAY MEAN The 10 day mean chart shows a gradual shift East of the trough previously shown across the UK suggesting a gradual trend towards High pressure becoming more influential from the West at that time with temperatures still rather chilly.
http://www.wetterzentrale.de/pics/Reem2401.gif
NOTABLE TRENDS & CHANGES FROM PREVIOUS RUNS The pattern between the models is well documented for this week as rather cold and unsettled conditions are projected by all models. Thereafter, there is more variability mostly surrounding how much High pressure from the West or SW interacts with the previously chilly and unsettled conditions across the UK.
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 97.0 pts while GFS lags behind at 96.3 pts. At 5 days ECM leads with 91.1 pts to UKMO at 89.1 pts and GFS at 87.4 pts. Then at 8 Days ECM has the leading spot from GFS with 67.7 pts to 64.5 pts. Finally at Day 10 ECM and GFS tie at 50.3 pts each.
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 share a similar theme in the next week with all output suggesting a cold and rather windy period of weather to come across the UK throughout this week and next weekend as Low pressure areas move SE down over the UK later dragging rather cold uppers down across the UK from the NW and with much instability aloft moving across relatively warm seas a lot of showers and some more persistent spells of rain for all seem likely on most days. It also looks that winds could veer Northerly next weekend enhancing the cold further for a time with snow showers especially near coasts, lighter winds with frosts at night. Then as we move further out into the less guaranteed period of 7-14 days the focus shifts on how much High pressure lying across the Atlantic one week from now shifts towards the UK settling things down with frosty nights but dry, bright and fine days. The GFS Clusters this morning strongly support this theme whereas the ECM operational at Day 10 sinks any High pressure South of the UK supporting a milder Westerly airflow developing next week with rain at times especially for the North and West. The ECM 10 Day Mean Chart this morning continues to grow the theme of High pressure ridging NE through the UK at day 10 suggesting that when taken as a whole and given the GFS theme too most output supports fine and pleasant weather possible from the middle of next week but with frosts at night.
Next Update Tuesday March 1st 2016 from 09:00
Martin G
Kilmersdon Radstock Bath Somerset