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doctormog
28 January 2018 20:32:40


ECM mean looks poor, we can probably put the scandi high dream to bed and move onto Spring warmth from the azores high pushing in. 


Originally Posted by: The Beast from the East 


Can we? Really? Please elaborate (remembering this is a model output discussion not silly mind games and melodrama thread).


Whether Idle
28 January 2018 20:50:14

12z SW coastal Holland ensembles.


https://www.weerplaza.nl/15daagseverwachting/?type=eps_pluim&element=&r=zuidwest


 


Further evidence that the chances of a strong easterly are remote.  Very few ice day runs even on the other side of the N Sea.


 


Looking like a fairly average period of weather in early February on balance. Time for things to change, but I hear a clock ticking....


Dover, 5m asl. Half a mile from the south coast.
jhall
28 January 2018 20:54:57


ECM mean looks poor, we can probably put the scandi high dream to bed and move onto Spring warmth from the azores high pushing in. 


Originally Posted by: The Beast from the East 


 


I don't think one often can learn a lot from the ECM mean chart as far ahead as T+240. It's almost always a flabby thing, no doubt usually disguising a wide range of different ensemble members. In this case the mean doesn't look too bad to me from a cold lover's point of view, with the 850mb -5C isotherm running from about the Wash to Southampton and the centre of the high pressure away to our west. Since that's the mean, a fair number of ensemble members will almost certainly be substantially colder (suggesting the high being centred further to the N or NE). By the same token, a fair number will be substantially milder than the mean, of course. But with the London mean 850mb temperature being somewhere around -6C, I wouldn't have thought it to be very different from the GFS ensemble's mean. One thing that does look fairly certain from the mean chart is that the pressure over the UK will be pretty high, so the outcome looks unlikely to be zonal.


Of course if we could only see the individual ECMWF ensemble members, we'd have a much better feel for things. It's always struck me as a little odd that the GFS, the model from the country where the profit motive is supposed to reign, should have all its results freely available, while the European model doesn't.


Cranleigh, Surrey
jhall
28 January 2018 21:04:21


12z SW coastal Holland ensembles.


https://www.weerplaza.nl/15daagseverwachting/?type=eps_pluim&element=&r=zuidwest


 


Further evidence that the chances of a strong easterly are remote.  Very few ice day runs even on the other side of the N Sea.


 


Looking like a fairly average period of weather in early February on balance. Time for things to change, but I hear a clock ticking....


Originally Posted by: Whether Idle 


 


The "Windrichting (°)" chart, which I take it is the wind direction, is interesting. By about 8 days out the ensemble wind directions seem to be spread pretty equally over the whole 360°! For what it's worth, the operational and control runs both have roughly NEly winds in their latter stages but, as you say, the temperature chart isn't very inspiring. Switching to their equivalent chart for the GFS, that looks rather colder than the ECMWF.


Cranleigh, Surrey
Whether Idle
28 January 2018 21:10:29


 


 


The "Windrichting (°)" chart, which I take it is the wind direction, is interesting. By about 8 days out the ensemble wind directions seem to be spread pretty equally over the whole 360°! For what it's worth, the operational and control runs both have roughly NEly winds in their latter stages but, as you say, the temperature chart isn't very inspiring. Switching to their equivalent chart for the GFS, that looks rather colder than the ECMWF.


Originally Posted by: jhall 


Yes The GEFS are slightly more encouraging but both suites are prone to flips at a range of 6 days plus. If its going to happen on 6th Feb, then Thursday evening is around the crunch time, possibly later.


Edit - I see no reason to be optimistic about this prospect.  The cold over the States and Canada does us no favours.  Only posting this evening as it gives me a break from the 'tyranny of work.'


Dover, 5m asl. Half a mile from the south coast.
polarwind
28 January 2018 21:41:15


As the jet stream is a main driver, does anyone have analysis going back a number of years on its behaviour.
You cannot look at one year in isolation but over a period is it:
More intense than previous periods. May suggest where everything gets pushed more east nowadays, even thunderstorms.
Does it kink more than usual, or flatline more.
By latitude, is it generally running higher now. May suggest less cold spells.


Originally Posted by: Phil G 

The jet stream over the last three months has been adjusting around the regular waves of warm air advection northwards and cold troughs pushing southwards, towards the ESE direction, where low pressure can develop to the SE on the continent. This allows space the the north for high pressure to develop and for cold air advection, for us, from the east. The principle driver for this is higher pressure to the NW of the Azores. All this is generally different to the NE direction of the jet over the last 30 years associated with the Azores High extending NE into Europe.


Nothing is guaranteed but opportunities for easterly outbreaks are, with these synoptics, increased and the models have picked upon this.


Your question is very relevant. 


The jet direction over the North Atlantic, is not just related to the position of the Azores High but to its behaviour around the whole of the N. Hemisphere and decades ago, the number of Rossby waves was identified by some climate scientists as being highly correlated with the general synoptics at our general location.


The relevant questions for the longer periods of time you identify, might well be -


          What causes the positional changes to the Azores High?


and


          What causes the changes to the numbers of Rossby waves?


and...........


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Dave,Derby
David M Porter
28 January 2018 21:47:13


ECM mean looks poor, we can probably put the scandi high dream to bed and move onto Spring warmth from the azores high pushing in. 


Originally Posted by: The Beast from the East 


Jumping the gun there methinks, Beast. Yes, it isn't the holy grail but we've seen worse charts in FI at times this winter which thankfully have not verified.


If we are to get a cold spell in February, my feeling is we will have to be patient.


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
The Beast from the East
28 January 2018 22:04:26
Ben Rich at least mentioned the chance of a scandi in the extended outlook. Still looks remote but we shall see. 18z looks okay so far
"We have some alternative facts for you"
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ballamar
28 January 2018 22:14:04
Welcome to bipolar model output thread
Rob K
28 January 2018 22:23:55
Meanwhile GFS has the -10C isotherm hitting the east coast by T180...
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
The Beast from the East
28 January 2018 22:24:15
Lol! Chasing snow for lowland southern England will drive anyone mad! 18z looks good as the high inflates in the right place. But as these things can go wrong at +72, it has to be nearly on top of us to be sure. The train is coming only when you can see the train, as Ian Brown says
"We have some alternative facts for you"
Kelly-Ann Conway - special adviser to the President
Brian Gaze
28 January 2018 22:24:27

Looks impressive!



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ballamar
28 January 2018 22:24:28
ballamar
28 January 2018 22:26:12


Looks impressive!



Originally Posted by: Brian Gaze 


 


polar bear impressive??

Rob K
28 January 2018 22:27:48
It's a very skinny high and looks to be under a lot of pressure from the north. Doesn't seem too convincing does it?

I'd want to see a much rounder HP cell and a good bit further north.
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
Gusty
28 January 2018 22:28:19

OK...lets all get together and give one last push for the easterly. (I have just about enough energy left) 


T +168 !


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.


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doctormog
28 January 2018 22:28:57
So, “we can probably put the scandi high dream to bed and move onto Spring warmth from the azores high pushing in.“

I’m confused. The output looks uncertain in medium term with blocking in our vicinity or maybe even to the NE, yet we should move onto spring warmth, despite the fact that it’s still January...?
ballamar
28 January 2018 22:32:53

So, “we can probably put the scandi high dream to bed and move onto Spring warmth from the azores high pushing in.“

I’m confused. The output looks uncertain in medium term with blocking in our vicinity or maybe even to the NE, yet we should move onto spring warmth, despite the fact that it’s still January...?

Originally Posted by: doctormog 


 


reverse psychology/I told you so posts are fairly annoying 

Deep Powder
28 January 2018 22:34:23

So, “we can probably put the scandi high dream to bed and move onto Spring warmth from the azores high pushing in.“

I’m confused. The output looks uncertain in medium term with blocking in our vicinity or maybe even to the NE, yet we should move onto spring warmth, despite the fact that it’s still January...?

Originally Posted by: doctormog 


👍😂 January 28th last time I checked, so no February until Thursday at the earliest. I am not convinced we will get a full blown easterly (as much as I would love one), however, I agree Michael that it's far too early to write of winter. No real signs of spring on offer as far as I can see in the main model output.....


Near Leatherhead 100masl (currently living in China since September 2019)
Loving the weather whatever it brings, snow, rain, wind, sun, heat, all great!
Karl Guille
28 January 2018 22:39:31
Certainly an interesting 18z GFS from an IMBY perspective but only subtle changes would result in a vastly different outcome. Nice to see all the same!
http://modeles.meteociel.fr/modeles/gfs/runs/2018012818/gfs-0-234.png?18 
St. Sampson
Guernsey
backtobasics
28 January 2018 22:47:47
It's quite impressive how if you skip through the 18Z run so far at say 12hr intervals you can watch the really old air dance around the uk but never really arrive, text book !!
Ensembles I think are more meaningful than ever at this point in time as the variation between the runs that i have seen seems higher than ever, watching certain posters mood swings every 6hrs is almost as much fun as the output.
Have to say not sold on the easterly at all myself, just doesn't look right really as per Robs thoughts earlier in the thread, long way to go yet though and all to play for.
Nights starting to pull out though so winter or spring ill take either 🙂
David M Porter
28 January 2018 23:23:14


 


👍😂 January 28th last time I checked, so no February until Thursday at the earliest. I am not convinced we will get a full blown easterly (as much as I would love one), however, I agree Michael that it's far too early to write of winter. No real signs of spring on offer as far as I can see in the main model output.....


Originally Posted by: Deep Powder 


Anyone who thinks that winter is over at this point in the season is taking the same gamble that came back to haunt our learned colleague, Andy Woodcock, back in 2005.


The model output generally this winter so far has been as erractic as I can recall it being during any winter during the time I've been a member of this forum, and that's saying something.


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
Gandalf The White
29 January 2018 00:40:23

It's a very skinny high and looks to be under a lot of pressure from the north. Doesn't seem too convincing does it?

I'd want to see a much rounder HP cell and a good bit further north.

Originally Posted by: Rob K 


For some reason it looks perfect on Meteociel with an upper high to support the surface high.  As for the shape, that's actually what you want to see - a rounder high pressure cell wouldn't deliver the clean easterly.


Location: South Cambridgeshire
130 metres ASL
52.0N 0.1E


Rob K
29 January 2018 07:18:41

Still none the wiser this morning. Neither the GFS or ECM op runs really deliver but there is the highest number of -10C runs on the ensemble so far if I'm not mistaken, with several full blown easterlies.


Londom snow row total is 101 which is also the highest I've seen. 


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
Shropshire
29 January 2018 07:34:15


Still none the wiser this morning. Neither the GFS or ECM op runs really deliver but there is the highest number of -10C runs on the ensemble so far if I'm not mistaken, with several full blown easterlies.


Londom snow row total is 101 which is also the highest I've seen. 


Originally Posted by: Rob K 


Yes difficult to see how this can become a full blown easterly within 10-12 days , there is too much shoulder going on from the jet and as long as that remains the case the core of heights for us will be the displaced AH.


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