Not a bad looking 12z GFS run - there's even a fun little runner LP that delivers snow for some in the South next Saturday. As usual caveat being it's just pretty pixels and not something to take particularly seriously at that range other than flagging that when you're in a predominantly chilly period little tweaks to the pattern can be the difference between chilly and wet or temporarily cold and snowy. (FWIW there's another band of rain/sleet/snow shown moving SE'wards for Sunday too).
(Thursdays snow risk is of course much more likely to verify and that's looking potentially very interesting for some folks in Northern England and Scotland. There's a snow risk for the Midlands out of that LP on GFS for a time too, although I suspect nothing to get too excited about).
Just to highlight the longer term uncertainty noticeably less in the way of mild air dragged over the south on this run. There's still some above average days, just less pronounced. If I had to bet, I'd say the ens will be broadly consistent with the last few sets - a couple of milder days down here incoming, then 4-5 days of chilly weather followed by a couple of mild, possibly noticeably mild days and then who know thereafter with plenty of milder than average and cooler than average members.
Without wanting to sound like a stuck record I know it's not the prize we could have won but it's a mostly chilly unsettled outlook and that at least means the possibility of snow popping up although obviously more chance of that the further North you are and the higher up you are. There's also still a chance of a few tweaks meaning a more widespread cold pattern*.
GEM run has a much more active LP for Saturday in to Sunday, which takes a more Northerly track and means coldish rain IMBY with snow risk much further North. Thereafter it diverges from GFS more noticeably and has a ridge of HP allowing some properly cold air to get dragged over Scotland (-11 850s for a brief time) before the ridge collapses towards Scandi and we get an attempt at a Scandi HP.
*So if I've got the MetO view correct they're of the opinion our current in coming chilly/cold spell is not due to the SSW. Makes for some interesting speculation then that they think the current warming will have more of an impact including reducing the strength of the jet. A LP stalling in the right place could bring some cold air more widely and for longer, conversely in the wrong place and we might end up having an early spring.
Edited by user
18 January 2021 17:54:20
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Reason: Typos
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