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Gooner
27 December 2015 10:46:16

Certainly up to the 216 mark a better run for us cold fans...................well into FI of course


Remember anything after T120 is really Just For Fun



Marcus
Banbury
North Oxfordshire
378 feet A S L


Bertwhistle
27 December 2015 10:48:30


 


What makes you think that so clearly?  I'm sure the MetO will not say anything publicly until it is nigh on certain... we are talking probabilities here. As discussed in various other replies, it would be helpful if you could post some charts in support of your arguments.  I see signs of an undercut as early as t144:


 


 


Originally Posted by: pdiddy 


I'm guilty of that too I'm afraid- not through lack of will. When I try to copy and paste it doesn't seem to work. Is there an easy way to do it using a link?


Bertie, Itchen Valley.
Retire while you can still press the 'retire now' button.
nsrobins
27 December 2015 10:56:23

The focus in the next batch of runs will be on the energy moving in from day 5 and how stoutly it can undercut. The old adage of 'get the cold in first' comes into play because we all know that the models have problems with deep cold pools to the East and the interplay with the western bias. 


It looks odds on that a solid cold pool will be in place in Central Europe from midweek. The way the Atlantic reacts to it is where the possibilities massively diverge. It could go either way, or even result in a classic battleground scenario with all that entails.


As for the 'official' take on it from the MetO, that may not reveal much for a few days yet.


Neil
Fareham, Hampshire 28m ASL (near estuary)
Stormchaser, Member TORRO
Charmhills
27 December 2015 10:57:13

FI is not looking very warm even a snow event or two given a southerly tracking jet and blocking over the Arctic.


 


Loughborough, EM.

Knowledge is power, ignorance is weakness.

Duane.
Karl Guille
27 December 2015 10:59:45


Certainly up to the 216 mark a better run for us cold fans...................well into FI of course


Originally Posted by: Gooner 


Certainly better than the 0z Marcus but you do just get the sense that if it does deliver it might take a while with a few different scenarios being tested and then disgarded before it settles on the final outcome. Yesterday's 18z and this morning's 0z had a cell of high pressure over s/w France stall the progress west of the main High and preventing any undercutting lows propping up the cold and dragging it westwards. Thankfully this is not so prevalent on the 6z which in turn allows the Atlantic lows to undercut the high and at least try to advect things westwards. On the Op the cold is limited to the north of the U.K. But further similar developments on the 12z and 18z could change things for the better (or worse)!😉


St. Sampson
Guernsey
White Meadows
27 December 2015 11:00:37
06z could have been better in the end. We end up with a series of lows too far north to bring in true cold. And disturbing amounts rain to boot.
Shropshire
27 December 2015 11:01:07

PDiddy, my point is that the detail for such a situation could not be known at T168 onwards.. but even if there was the possibility of the sort of battle being shown on the GFS/ECM occuring, they would be mentioning it as a low probability - but they are not even mentioning it.


 


 


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Gooner
27 December 2015 11:03:14

Can't really grumble Karl , at least we have something interesting to view, and something much chillier at least looks on the cards


Remember anything after T120 is really Just For Fun



Marcus
Banbury
North Oxfordshire
378 feet A S L


Polar Low
27 December 2015 11:04:26

Indeed Marcus one of the most pleasing aspects are the jets much better position with heights lower in mainland southern Europe



 



 



Certainly up to the 216 mark a better run for us cold fans...................well into FI of course


Originally Posted by: Gooner 

Gooner
27 December 2015 11:04:52


PDiddy, my point is that the detail for such a situation could not be known at T168 onwards.. but even if there was the possibility of the sort of battle being shown on the GFS/ECM occuring, they would be mentioning it as a low probability - but they are not even mentioning it.


 


 


Originally Posted by: Shropshire 


They have


 


but the chance of a prolonged cold spell remains low.


Remember anything after T120 is really Just For Fun



Marcus
Banbury
North Oxfordshire
378 feet A S L


Rob K
27 December 2015 11:05:10


PDiddy, my point is that the detail for such a situation could not be known at T168 onwards.. but even if there was the possibility of the sort of battle being shown on the GFS/ECM occuring, they would be mentioning it as a low probability - but they are not even mentioning it.


 


 


Originally Posted by: Shropshire 


As past events have shown, the Met Office text forecasts sometimes don't change until events are almost upon us. Many a time in previous winters they have been playing catch up when the models change fast. 


The Met Office are pretty good but they are not in control of the weather, and they can get caught out just like any of us. They have to be seen to "play safe" so they won't start talking about cold and causing media fuss until they have to. 


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
Polar Low
27 December 2015 11:09:22

Thats how I see it 


 



FI is not looking very warm even a snow event or two given a southerly tracking jet and blocking over the Arctic.


 


Originally Posted by: Charmhills 

Gooner
27 December 2015 11:09:41


 


As past events have shown, the Met Office text forecasts sometimes don't change until events are almost upon us. Many a time in previous winters they have been playing catch up when the models change fast. 


The Met Office are pretty good but they are not in control of the weather, and they can get caught out just like any of us. They have to be seen to "play safe" so they won't start talking about cold and causing media fuss until they have to. 


Originally Posted by: Rob K 


Correct Rob, the charts dont follow the Met O update..................................it's the other way around, with a bit of a delay.


I think if we are still seeing this type of battle tomorrow , we could well see them mentioning it


Remember anything after T120 is really Just For Fun



Marcus
Banbury
North Oxfordshire
378 feet A S L


Gusty
27 December 2015 11:10:29

The probability for an easterly has increased a notch again today and is now up to 25% IMO. Its a favourable trend that has been consistent for the last few days now. The models have edged away from the largely unanimous atlantic breakthrough in favour of of a more stubborn and better aligned high pressure cell over Scandinavia. The N-S cold air advection shown in Eastern Europe headed for Greece a few days ago is becoming increasingly aligned more NE-SW edging closer to our shores.


Things are never straightforward..the atlantic is obviously still the form horse with energy piling northwards eventually eroding the block southwards with time but the trend is good.


Even if the models do firm up on undercutting energy we may then have to deal with our old friend the shortwave over the Baltic..historically a frustrating feature that delays or prevents proper cold reaching us.


All in all though its looking pretty damn good. 


Steve - Folkestone, Kent
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doctormog
27 December 2015 11:10:31


PDiddy, my point is that the detail for such a situation could not be known at T168 onwards.. but even if there was the possibility of the sort of battle being shown on the GFS/ECM occuring, they would be mentioning it as a low probability - but they are not even mentioning it.


 


Originally Posted by: Shropshire 


They are not mentioning it simply bcause it is a low (but growing) probability. Nothing more nothing less than that. I am sure it has their attention but I would expect it not to be mentioned, even as a risk, for a few days. Unlike us the Met Office cannot discuss every potential cold spell with the general public. Right T the moment they have other more pressing and timeous issues to deal with before they start discussing any risk of cold a week or two out.


None of this, despite your assertions, suggests that the easterly scenarios have no chance of materialising. As long as they are shown in the charts (and increasingly in the ensembles) they must remain a realistic option. The thing is about options is that s any of them could occur. As yet, we do not know which.


Saying something doesn't make it happen.


Polar Low
27 December 2015 11:12:06

Highlight link then try control c then into live form page control v.... You do really need links to explain your thoughts


 



 


I'm guilty of that too I'm afraid- not through lack of will. When I try to copy and paste it doesn't seem to work. Is there an easy way to do it using a link?


Originally Posted by: Bertwhistle 

Polar Low
27 December 2015 11:18:15

Indeed Steve we have a decent chance



quote=Gusty;746823]


The probability for an easterly has increased a notch again today and is now up to 25% IMO. Its a favourable trend that has been consistent for the last few days now. The models have edged away from the largely unanimous atlantic breakthrough in favour of of a more stubborn and better aligned high pressure cell over Scandinavia. The N-S cold air advection shown in Eastern Europe headed for Greece a few days ago is becoming increasingly aligned more NE-SW edging closer to our shores.


Things are never straightforward..the atlantic is obviously still the form horse with energy piling northwards eventually eroding the block southwards with time but the trend is good.


Even if the models do firm up on undercutting energy we may then have to deal with our old friend the shortwave over the Baltic..historically a frustrating feature that delays or prevents proper cold reaching us.


All in all though its looking pretty damn good. 


tallyho_83
27 December 2015 11:22:31

For contrasting purposes! - Pressure of 945mb over Iceland & 1045mb over Baltics and (less than 1000 miles east).

http://www.wetterzentrale.de/pics/Rtavn721.gif


 


Home Location - Kellands Lane, Okehampton, Devon (200m ASL)
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Bertwhistle
27 December 2015 11:23:07

This low has a clear Easterly component on its straight side. Quantum said such lows will undercut. But GFS has it steaming on up across the country.


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.


Bertie, Itchen Valley.
Retire while you can still press the 'retire now' button.
Karl Guille
27 December 2015 11:25:39
The 6z GFS Control gives it a good go at T168 with an undercutting low but will not quite achieve it from here but it will be far from mild and, hopefully, this trend will continue.


St. Sampson
Guernsey
White Meadows
27 December 2015 11:27:00
Am I the only one thinking any lows are modelled just too far north?
Until heights drop over Europe we're stuck with stalling Atlantic systems with westerlies.
Gooner
27 December 2015 11:34:56

The 6z GFS Control gives it a good go at T168 with an undercutting low but will not quite achieve it from here but it will be far from mild and, hopefully, this trend will continue.

Originally Posted by: Karl Guille 


Indeed it does Karl


 



Remember anything after T120 is really Just For Fun



Marcus
Banbury
North Oxfordshire
378 feet A S L


roger63
27 December 2015 11:37:45

Am I the only one thinking any lows are modelled just too far north?
Until heights drop over Europe we're stuck with stalling Atlantic systems with westerlies.

Originally Posted by: White Meadows 


Looking at GEFS 06h En the odds  still favour mild zonal over Cold easterly.


at 144h 55:45


at 192h 55:45


at 240h 65:35 


I await a clear easterly to show uo on the METO 120h fax. before changing any view on cold breaking through the stalemate.

Solar Cycles
27 December 2015 11:54:04
For me we've moved a step closer in getting cold air to these shores but it's fraught with danger and we could easily end up with any troughing too far North. Great model watching nonetheless but having seen these set ups fall by the wayside once we approach the +120 hrs I'll remain highly sceptical.
Brian Gaze
27 December 2015 12:02:48

Some interest here on the 6z suite. 



Brian Gaze
Berkhamsted
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