HERE IS MY LATEST ANALYSIS FROM THE OUTPUTS OF THE WEATHER COMPUTER PREDICTION MODELS FOR TWO WEEKS FROM 8AM TODAY MONDAY AUGUST 18TH 2014.
THE CURRENT GENERAL SITUATION. Low pressure will persist over Scandinavia with a cool but weakening NW flow across the UK persisting too.
MODELS-2 WEEK HEADLINE Mostly rather cool with sunshine and showers and with some longer spells of rain at times later more especially over the North and West.
THE JET STREAM FORECAST The Jet Stream currently flowing SE across the UK will weaken through the coming week at the same time as tilting back to a West to East flow and migrating further South towards France by next weekend where it blows a little stronger again then. Towards the end of the period the flow becomes more complex but generally quite weak for a time.
GFS The GFS operational this morning shows a cool week to come under a reltaively light NW flow. A showery trough is shown to sink South across the UK later in the week followed by a ridge to give a cool and dry weekend before a more mobile, stronger westerly flow under association of low pressure moves across from the West in Week 2 with rain, showers and brisk winds for all at times. The GFS Ensembles this morning show a similar synopses and trend but the drier interlude at the weekend might last a little longer for some Southern and Eastern parts where it also could become less ool for a time early next week.
UKMO UKMO this morning shows the showery trough later this week clearing away to the East with a 'Col' area over the UK to start next week with a lot of dry and bright weather under clear or bright skies but very chilly nights.
THE FAX CHARTS The Fax Charts maintain a cool and occasionally unstable airflow from the NW over the UK up to next weekend with a mix of sunnier moments mixed with more showery and cloudier interludes.
GEM The GEM operational today shows the showery airflow this week giving way to a brighter and less cool few days around next weekend before renewed Low pressure moves in from the west next week with cloud, breeze, rain and showers in that order affect the UK next week.
NAVGEM NAVGEM too follows the trend of others with a cool week to come with some showers and brings a ridge of High pressure across the UK at the weekend before Low pressure moving over the North from the West early next week sweeps troughs across the UK with wind and rain for all.
ECM The ECM operational shows the most optimistic outcome this morning if you live towards the SE. Though the same sequence of events look likely in the same way as the other models suggest High pressure is shown being closer to the SE for a time with much wamer and drier conditions possible here before shallow Low pressure towards the SW brings the risk of some thundery rain towards the end of the run to all but SE England.
NOTABLE TREND CHANGES FROM PREVIOUS RUNS There again seems little shift of emhasis in this morning's output to the pattern that has been shown now for repeated runs of late although ECM does offer something a little different in it's operational at least.
MY THOUGHTS The general theme of the model outputs this morning is for a continuation of the changeable theme. After the agreed upon cool and occasionally showery conditions of this week a warmer and dry weekend looks like being the precursor to more Low pressure moving in off the Atlantic early next week with wind, rain and showers for all looking likely. ECM does offer a grain of comfort in that it holds next week's Low further to the NW allowing High pressure to the SE to bring much warmer air NE across Southern and Eastern Britain but unless it is given strong support from it's ensembles issued later this morning then I'm afraid it looks like a grain of sand in a desert and the more likely scenario is for the UK to continue it's chance of bucking the trend of the warmer than average months most areas have seen of late.
Martin G
Kilmersdon Radstock Bath Somerset