http://modeles.meteociel.fr/modeles/wrfnmm/runs/2014012606/nmm-25-72-0.png?26-11
WRF projects an endless onslaught of showers for the north coasts of Devon and most of Cornwall, which in combination with today's front delivers over 100mm in the next 72 hours...!
Naturally, the showers travel inland a bit too, though I reckon it's probably not taking them far enough, as is usually the case, and this is backed up by EURO-4 showing bands of showers streaming right across the UK.
Given the positioning of the low, a NW'rly regime backing W'rly for much of the period is indeed likely to bring the largest falls of precipitation to western coasts, particularly the areas mentioned at the start of this post.
By around 72 hours, the winds turn to the SW from the Solent eastward, which could bring those areas into the firing line for more substantial shower accumulations, although I suspect that the Solent for example will already have seen quite a bit by then - notably more than WRF predicts.
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T-Max: 30.2°C 9th Sep (...!) | T-Min: -7.1°C 22nd & 23rd Jan | Wettest Day: 25.9mm 2nd Nov | Ice Days: 1 (2nd Dec -1.3°C in freezing fog)
Keep Calm and Forecast On