HERE IS MY LATEST ANALYSIS FROM THE OUTPUTS OF THE WEATHER COMPUTER PREDICTION MODELS FOR TWO WEEKS FROM 8AM TODAY SUNDAY JULY 27TH 2014.
THE CURRENT GENERAL SITUATION. A cooler but slack Westerly flow will continue to develop across the UK.
MODELS-2 WEEK HEADLINE Slowly becoming cooler and more unsettled with by the end of this week continuing into week 2. Possibly brighter and warmer again at the end of the period.
GFS The GFS operational this morning shows the trend as before with cooler weather pulling down slowly from the North this week though any meaningful effect of this will take a long while to reach the extreme South. Showers in the North by nidweek will extend to all areas with time as shallow Low pressure develops across the UK. Temperatures will be closer to average but still somewhat on the warm side in the South at times. Later in the run the Low pressure areas relax somewhat as pressure builds weakly again acroo Britain with more in the way of dry ad bright weather and fewer showers. The Ensembles too show low pressure becoming more dominant across the UK later next week, through the weekend and into week 2 with rain and showers for all in average temperatures. They do support rising pressure and more settled, warmer conditions returning under UK based High pressure at the end of the period.
UKMO UKMO this morning shows pressure falling slowly later this week with the dry weather in the South slowly giving way to a UK wide mix of sunshine and showers in a Westerly breeze by next weekend with temperatures falling back towards the seasonal average especially in the North.
THE FAX CHARTS These charts continue to show a series of weak fronts affecting mostly the North of the UK with showers at times, more prolific than elsewhere whereas Southern Britain maintains a lot of dry and bright weather if rather cooler and fresher than of late though even here some troughs could bring a little rain later.
GEM The GEM operational this morning shows pressure falling over the UK later this week enhancing the already cooler weather with cloud and eventual rain and wind across the UK in association with a deep Low close to SW England next weekend. As we move into next week this Low fills and lifts away North with pressure rising again from the South with showers becoming restricted towards the North.
NAVGEM NAVGEM slides weak Low pressure South across Britain later next week in slack winds mostly from a Westerly point. Daytime heavy showers would be likely, heaviest and most prolific over inland Northern and Eastern parts.
ECM The ECM operational continues to look very low pressure biased for the UK though not quite a s harshly as last night. Nevertheless after benign weather for the first half or so of this week a deterioration in conditions under falling pressure will deliver rain at times by next weekend for all as Low pressure posiitions over the UK. This then recedes just slowly away North at the end of the run but maintains plenty of showers especially in the North at the end of the run.
NOTABLE TREND CHANGES FROM PREVIOUS RUNS There are few notable cross model support changes today with all output maintaining the general theme of cooler and more unsettled weather gradually taking control over the UK with time while aso hinting at a return to better conditions later in Week 2.
MY THOUGHTS The weather charts today continue to show a slow deterioration in conditions as we move through this week. Nevertheless apart from rather lower temperatures than of late across the South it is unlikely that we will see much rain down here for some time yet. Low pressure is shown by all models to take more influence across all areas by next weekend although even then some models keep this shallow while ECM and GEM show a much more closed centre to low pressure giving rise to more wind as a result with more general precipitation a possibility. The longer term charts continue to suggest that such a change to unsettled weather could well be temporary as pressure builds from the SW again through week 2 with a return to summery conditions a possibility at least.
NEXT UPDATE AT 10:00PM SUNDAY JULY 27TH 2014
Martin G
Kilmersdon Radstock Bath Somerset