Looking at the GFS today and over the last few runs the trend at present has been to nudge the 850s down slightly in the upcoming chilly/cold spell and to slightly lengthen the duration so we're now approaching 27th Jan before warmer air moves in down South. The milder hump is being eroded so that 'mild' is more likely than 'exceptionally mild' although the twin peaks of mild are still there, more notably the second one as the next LP moves through.
Thereafter there's signs of the jet moving back south and LPs taking a southerly track through North France rather than through the Midlands and a reoccurring theme on some of the Op runs/members in deep FI is for heights to rise over Scandinavia and the Atlantic to get stopped. There's decent agreement of temps being lower than average at the end, which is unusual at that kind of range. Be interesting if that signal is maintained and starts to move towards the vaguely reliable.
ECM is similar and if anything has shown a slightly greater reduction in 850s down here from what it was showing for quite a few days. The ECM ens have been showing the same milder bump as GFS for a while and a reduction in 850s towards the end of the run too, albeit with the usual mix of mild/avg/cool.
Near term and the GFS op has less extensive snowfall from the current LP than it had shown at range IMO but there's still a decent area that's projected to get heavy snow from the system. Parts of Scotland look set for further snowfall and over the next few days presumably from showers once the LP moves off somewhat. Even down here there's still the chance of some snow falling at least over the weekend, with that slight nudge down in 850s hopefully verifying and making this a touch more likely.
Leaving aside the snow potential interest the next 10 days are still looking wet for many, with a lot of rain for parts of Wales and generally between 40-80mm across the whole of the UK (bit less for some in the East as you'd expect given the direction the LPs are coming from).. Certainly enough for some more flooding problems and if nothing else even the smaller amounts further East will mean the ground remains saturated and streams high, so any one off heavier rain events will quickly lead to problems.
Certainly an interesting outlook with the potential for a chilly start to February just to confound the LRFs
Edited by user
20 January 2021 08:32:02
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Reason: Typos
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