http://www.meteociel.fr/ukmo/archives/2014092012/UW96-21.GIF
http://modeles.meteociel.fr/modeles/gfs/archives/2014092012/gfs-0-96.png
Quite some disparity between UKMO and GFS even at just 4 days range! It apepars to be due to GFS having a flatter jet which drives energy east all the way to the trough over Scandinavia by that day. UKMO doesn't model that, and nor does ECM. GEM sits at halfway house on that one but JMA sides with GFS.
That's a bit of an issue to have at such short range, as it determines to what extent HP influences the UK days 5-8. GFS brings LP closest to the NE of the UK on day 6, with JMA having a trough similarly placed but weaker with more of the trough development occuring in the mid-Atlantic instead.
GEM develops a SW-NE jet orientation similar to UKMO, but neither can compare with this extraordinary setup from ECM:
http://www.wetterzentrale.de/pics/Recm1442.gif
...though it has to be said that UKMO is very close:
http://www.meteociel.fr/ukmo/archives/2014092012/UW144-21.GIF
The ridge shown across the UK is truly vast, particularly in the case of the ECM run, which also manages to keep the ridge weak enough to resemble a massive region of nothing much at all synoptically. The chart almost seems to be beyond what I would have thought possible!
Interestingly enough, GEM isn't that far away from UKMO and ECM despite having a flatter jet at day 4:
http://modeles.meteociel.fr/modeles/gem/archives/2014092012/gem-0-144.png
This suggests a strong chance of seeing the SW-NE jet evolve soon enough to keep the storms well NW of the UK. Trouble is, JMA sticks close to GFS right out to day 8, and those two models in combination can't be discounted - so there remains a fair chance of more unsettled conditions influencing the NW at least, with JMA even bringing the middle swathe of the UK into the line of fire at the end of the run.
GFS keeps the bulk of England and Wales more or less dry right through to 6th October. Some spots would end up on a run of 37 dry consecutive days (when ignoring dew, mist and fog deposits) if that verified!
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