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idj20
21 January 2020 17:25:06


The 12z GFS is actually better than the 06z. In the context of this Winter I'd take it with open arms. Plenty of PM shots and snow for northern areas with elevation and perhaps down to lover levels at times too. 


The ECM ens were horrific earlier so no doubt it will be along to burst this little bubble of hope shortly.


Originally Posted by: Northern Sky 



Whereas in my eyes,  next week is looking awful with widespread strong winds on Monday and a storm system slicing through the UK on Thursday. That holds no appeal to me at all but given that the end of next week is a long way off in forecasting terms and thus is subject to change anyway - which hopefully include downgrades.


Folkestone Harbour. 
briggsy6
21 January 2020 17:50:29

Are we in for a back loaded Winter I wonder ?? 


Location: Uxbridge
doctormog
21 January 2020 17:55:54


Are we in for a back loaded Winter I wonder ?? 


Originally Posted by: briggsy6 


If you mean less stupidly mild than the first half then probably. The jury is still out on whether it includes anything wintry however.


fairweather
21 January 2020 18:11:11


Are we in for a back loaded Winter I wonder ?? 


Originally Posted by: briggsy6 


Back loaded into April probably!


S.Essex, 42m ASL
SnowyHythe(Kent)
21 January 2020 18:47:50

https://www.wetterzentrale.de/en/topkarten.php?map=1&model=ecm&var=1&run=12&time=192&lid=OP&h=0&mv=0&tr=24#mapref


If modelled correctly, the HP situated East of Canada and the US could be interesting..


Long way out though. 


ECM 192

Rob K
21 January 2020 18:49:54


Not looking great after the one to two day colder blips. Still we will increase our blip count to three for this winter. This could be my third consecutive winter with no snow lying.


Originally Posted by: fairweather 


Lying? So far there is no sign of anything even falling away from high ground. Although you must have been incredibly unlucky not to get any lying snow last year or 2018 (or are you only classing meteorological winter and discounting March 2018?)


Yateley, NE Hampshire, 73m asl
"But who wants to be foretold the weather? It is bad enough when it comes, without our having the misery of knowing about it beforehand." — Jerome K. Jerome
LeedsLad123
21 January 2020 19:25:36


 


Lying? So far there is no sign of anything even falling away from high ground. Although you must have been incredibly unlucky not to get any lying snow last year or 2018 (or are you only classing meteorological winter and discounting March 2018?)


Originally Posted by: Rob K 


I don’t really remember any lying snow last year here. I hardly remember any falling snow for that matter.


Whitkirk, Leeds - 85m ASL.
Phil24
21 January 2020 20:18:50


Are we in for a back loaded Winter I wonder ?? 


Originally Posted by: briggsy6 


If Judah is correct, possible methinks  


“There hasn't been much opportunity to tweet about the #polarvortex (PV) the past month but finally some signs of change. The biggest vertical energy pulse (needed to disrupt the PV) in over a month predicted resulting in a stratospheric -AO for next week. More disruption possible”

JACKO4EVER
21 January 2020 20:29:24


Are we in for a ANY Winter I wonder ?? 


Originally Posted by: briggsy6 


Corrected 😉

some faraway beach
21 January 2020 21:32:21


 


I'm no expert, but I don't see why improving a model for the short term should make it less accurate in the long time. There might well come a point at maybe around 10 days out when the accumulation of random errors means it is no longer any better than it was before it was improved, but I don't see why it should actually be worse.


Originally Posted by: jhall 


My thinking is that the improvement in short-term accuracy comes from an increase in the number of data points, along with a narrowing of the gap between calculations as the model run progresses (say, from 12 hrs, 24 hrs, 36 hrs etc. to 03 hrs, 06 hrs, 09 hrs, 12 hrs, and so on).


The result is an exponential increase in the number of potential small errors, which (exponentially) become big errors eventually - you know, the thing about a butterfly flapping its wings and causing a hurricane.


Re Gandalf's comment that rounding errors should only have a negligible effect - I would disagree with that, particularly when dealing with our part of the world, where even the subtlest changes in a similar general pattern can result in vastly different weather on the ground. Rounding errors are the bane of iterative models (which is what these are).


A tenth of a degree centigrade here, half a millibar there, and ten days later, and thousands of calculations further on, the error gets multiplied into something substantial. But on a coarser model, with fewer data points, and a 12-hour gap between iterations, any tiny errors have less opportunity to take on a life of their own.


It's nothing to do with the mathematical calculations themselves becoming less accurate. It's just that the numbers on which those calculations are based become open to more errors as more calculations need to be made. 


2 miles west of Taunton, 32 m asl, where "milder air moving in from the west" becomes SNOWMAGEDDON.
Well, two or three times a decade it does, anyway.
Gusty
21 January 2020 21:40:47

As the days grow longer....the cold grows stronger.....not. 


No chart available for the selected hour. Many charts start at 3 hours ahead, so if you have 0 hours selected try stepping forward or selecting a later hour.


Steve - Folkestone, Kent
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idj20
21 January 2020 23:00:28

Next Monday's wind event looks like turning out to be virtually identical to what Brendan did for us last Monday in terms of wind speed and timings for here at the south eastern end of the country, a long drawn out process involving an elongated warm sector with 40 mph sustained SSW winds and up to 60 mph gusts starting in the afternoon and lasting into the small hours  

 

While it goes without saying on how we are doing very poor in terms of proper snow and cold, thankfully the recent extra high pressure is preventing this Winter from being anywhere as bad as 2013/14 for this neck of the wood.


Folkestone Harbour. 
BJBlake
21 January 2020 23:46:25
On the northern hemisphere chart (GFS) this evening, I'm astonished how little cold air there is about, with the USA and Canada being devoid of anything cold for a period in this run, quite staggering.

There are signs again of a change at the end of the run deep into FI. However - it could be another false dawn. More polar maritime / quasi- Arctic Purtabations in the bundle.
Brecklands, South Norfolk 28m ASL
Arbroath 1320
22 January 2020 00:08:51
GFS 18z prolongs the cool/cold zonality which kicks in next week into deep FI. Certainly a colder run than we've seen for some time, albeit a quick look at the ENS suggests the op is a bit of a cold outlier in FI.
GGTTH
BJBlake
22 January 2020 06:53:09
Zonal dulldom again this morning - but the average is colder with many polar maritime cold options and p10 the best tease. The jet is shown to be back at a winter latitude by the end of run as an average. small mercies but the right direction if like winter to be wintry.
Brecklands, South Norfolk 28m ASL
moomin75
22 January 2020 07:08:17
Are we yet at the stage to throw in the towel as I did weeks ago? Winter just isn't coming this year, although no doubt we will have masses of northern blocking come Easter.
Witney, Oxfordshire
100m ASL
DEW
  • DEW
  • Advanced Member
22 January 2020 07:21:03

Yes, boring outlook for time to come, so went an looked at UIA first,


High pressure gone by Friday, then zonal through the next two weeks. Colder NW-ly around Tue 28th / Fri 31st / Tue 4th, milder SW-ly around Mon 27th / Thu 30th / Sat 1st / Thu 6th. Suggestion of fronts trailing down across the country (as expected from the above pattern) by rainfall chart for week 2 http://www.wxmaps.org/pix/prec4


GFS & ECM agree, with minor differences in timing (GFS version above)


GEFS temps a little above average then down and up starting with a dip on the 28th/29th, at which date rainfall starts up and continues to the end of the run on 7th Feb, more rain throughout than in yesterday's forecast. Temp swings more pronounced in S England than in Scotland where temps in most runs a bit below normal. Some E coast locations escape the worst of the rain.


War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl
David M Porter
22 January 2020 08:02:32

Are we yet at the stage to throw in the towel as I did weeks ago? Winter just isn't coming this year, although no doubt we will have masses of northern blocking come Easter.

Originally Posted by: moomin75 


Based on the model output for the next couple of weeks, then OK. However, even once we get past the range of the current GFS op runs we will still have another three weeks or thereabouts of the meteorogical winter to go.


Lenzie, Glasgow

"Let us not take ourselves too seriously. None of us has a monopoly on wisdom, and we must always be ready to listen and respect other points of view."- Queen Elizabeth II 1926-2022
Gusty
22 January 2020 08:03:16

....back to where we were in December then.


Steve - Folkestone, Kent
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nsrobins
22 January 2020 08:47:54
Now the chocolate that’s the 18Z GFS OP has melted we’re no nearer getting what we coldies crave. The drivers don’t want to let up - MJO dipping back to neutral/COD and as strong and organised a PV as you’re likely to see (though actually fairly typical for NH winter).
The headline into next week will be stormy and wet at times with shots of cool pM, taking us to month’s end.
If we can get something out of this winter it’ll have to fight against the background signals, but there’s time.

Neil
Fareham, Hampshire 28m ASL (near estuary)
Stormchaser, Member TORRO
Gusty
22 January 2020 08:52:11

Are we yet at the stage to throw in the towel as I did weeks ago? Winter just isn't coming this year, although no doubt we will have masses of northern blocking come Easter.

Originally Posted by: moomin75 


Give it a few more weeks Moomin. Its not looking great, admittedly, but we know how quickly things can change.


The Mid Winter easterly has dodged us again though.


Its starts as a seed from one single run though. I shall keep the faith and my hopes alive for another 3 weeks before conceding.


 


 


Steve - Folkestone, Kent
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Gandalf The White
22 January 2020 09:08:52


 


Give it a few more weeks Moomin. Its not looking great, admittedly, but we know how quickly things can change.


The Mid Winter easterly has dodged us again though.


Its starts as a seed from one single run though. I shall keep the faith and my hopes alive for another 3 weeks before conceding.


 


 


Originally Posted by: Gusty 


Given that model reliability drops away beyond around a week (and that’s the long wave pattern, not the detail) I think there’s another 5 weeks before we will know how the end of February is looking. Then, of course, there’s March; I know many people don’t value snowfalls in March but in the first week or two it can still be winter-like. Beyond that I’d prefer some warmth.


Location: South Cambridgeshire
130 metres ASL
52.0N 0.1E


Surrey John
22 January 2020 09:52:53
Short term 28th (29th for further South) might be some snow for a while (although might be sleet or rain)

The snow rows on the ensembles are 17 (of 23) for some northern locations
even London has 11 of 23 (not quite half), unlike some with majority

As usual the higher your elevation, the better the chance, but to me looks like a transitory event



Bradford on Avon, Wiltshire
35m ASL
fairweather
22 January 2020 10:45:00


 


Given that model reliability drops away beyond around a week (and that’s the long wave pattern, not the detail) I think there’s another 5 weeks before we will know how the end of February is looking. Then, of course, there’s March; I know many people don’t value snowfalls in March but in the first week or two it can still be winter-like. Beyond that I’d prefer some warmth.


Originally Posted by: Gandalf The White 


I think that is true of a March following an average or cold winter but after such a mild winter it would take something on the scale of the previous March Beast to get anything of note and even that would almost certainly be brief. It won't be helped by soaked ground and high soil temperatures either.


S.Essex, 42m ASL
Saint Snow
22 January 2020 16:46:27


I think that is true of a March following an average or cold winter but after such a mild winter it would take something on the scale of the previous March Beast to get anything of note and even that would almost certainly be brief. It won't be helped by soaked ground and high soil temperatures either.


Originally Posted by: fairweather 


 


I remember the winter 05/6 was pretty rubbish until a UK high retrogressed and brought cold with frequent and heavy snow showers to north-facing coasts (I remember Bren posting pics of around his parents' place in North Wales, deep with snow). The high drifted over Scandinavia and a front from the NW brought more widespread snow the first weekend in March; then after a nice, cool, dry week, a major front was forecast to move into mainland UK from the west with heavy snow. It stalled just west of the coast of NW England so we only got about 3-4cm - but places in Cumbria, West/Central Scotland, and Wales had up to 50cm level snow.


 



Martin
Home: St Helens (26m asl) Work: Manchester (75m asl)
A TWO addict since 14/12/01
"How can wealth persuade poverty to use its political freedom to keep wealth in power? Here lies the whole art of Conservative politics."
Aneurin Bevan

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