But as you know that's anecdotal. Not necessarily a bad approach at times but the NCEP stats don't seem to back it up. I'd also say that when looking at 500hPa charts across the entire hemisphere they don't jump around nearly as much as many people think. The jumping around is to a large extent a function of zooming in and focusing on the UK / NW Europe as we often do at this level.
Originally Posted by: Brian Gaze
Models like GFS are good at showing us if warming of the strat. and displacement of the vortex are likely, but bad at getting the timing right (often too progressive) and also the movement of the vortex beyond a very broad suggestion e.g. toward Asia in general.
So it is that verification stats hardly impress - however reading an overall signal from the strat. charts tends to be fairly reliable, particularly if an adjustment to expectations is made based on known errors, such as anticipating a possible significant warming event toward the end of the month based on the current hints from GFS for the mid-month period.
...
Moving on to today's output, and the GFS 12z is dire for much of Wales and the central third of England, with a frontal system becoming trapped across the UK while a developed low advances very slowly from the southwest and - most significantly - a number of secondary disturbances develop and run west-east along that frontal boundary.
The result is 3 days of persistent, often heavy rain, with over 100 mm projected for many locations within the band outlined above.
across a wide area (even when taking out the pre-weekend totals).
The second disturbance is arguably the worst and it just so happens there's little sign of that in the UKMO output this evening so there's a cause for some hope that the rains might not prove as bad as GFS is suggesting.
For what it's worth, here's the 10-day total:
Imagine where the monthly totals would stand across NW Wales by that time if this run was to prove accurate!
Edited by user
09 December 2015 20:53:11
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Reason: Now it's the 12z hooray
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