Good morning. Here is the latest report on the midnight outputs from GFS, UKMO, GEM, NAVGEM and ECM for today Wednesday August 14th 2013. Sorry there was no report last night. I am intermittently without internet while my equipment is being upgraded. Sorry for that.
Anyway, all models show a SW flow developing across the UK which is inherently warm and humid. It will carry a lot of cloud across the UK and with weak warm fronts in the flow the chance of some rain or drizzle is quite high. A few bright and sunny intervals could develop in the lee of the hills. Through Thursday a few sharp showers could develop in the East before a cold front crosses East on Friday with rain for all followed by fresher and cooler conditions. The weekend then sees a deep Low cross East to the North with wind and rain sweeping East through all parts later Saturday followed by sunshine and windy conditions on Sunday with showers in the North.
GFS then shows steady improvements next week as High pressure builds from the SW across the UK with fine and warm conditions developing with some sunny spells for all. A UK based High pressure is then shown for some considerable time before the High declines and allows Atlantic fronts and depressions to move in from the West by the end of the run with a return to cooler conditions with some rain.
The GFS Ensembles show good support for a strong rise in temperatures next week with mostly dry weather in tow too as High pressure takes control from the SW. Slightly more changeable weather remains in the North with some rain at times shown by some members. There is a wide spread between members North and South from the onset of the milder phase next week showing some uncertainty as to the extent of the warmth depth and spread across the UK.
The Jet Stream shows a west to East flow across the UK for the coming week before it weakens and breaks up with the main axis shifting North of the UK later in the run.
UKMO today shows High pressure moving NE towards the English Channel by Tuesday of next week replacing the cool and blustery wind of Monday with warmer and more settled weather arriving across the South.
GEM today also shows an improvement next week but more so for the South than the North as High pressure is held at more Southerly latitudes today keeping the risk of Low pressure and fronts running across the North at times with a cooler NW flow toppling down over the UK late in the run.
NAVGEM also shows High pressure migrating towards the UK next week but never quite crossing the UK to tap us into any Continental feed. Instead any warmth and sunshine is held across the South with the North much slower to see the benefits of the High as it remains positioned SW of Ireland at the end of the run.
ECM though is good for warmth lovers this morning as it builds very warm and humid air NE early next week. There is a spoiler cutoff Low to get rid of first with potential thundery showers in humid air up to midweek. thereafter the stage is set for a spell of very warm and sunny weather with light winds which seems likely to extend to the North too.
In Summary today the weather remains set to improve next week. Improvements will be slow in the North and some output shows little improvement at all their as they build High pressure too far South. However, ECM and GFS are excellent for a period of very warm and sunny weather developing for all areas through the second half of next week and beyond. Apart from the unsettled and windy phase at the weekend there is little sign of any appreciable rainfall of note across the UK within today's outputs.
Martin G
Kilmersdon Radstock Bath Somerset