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seringador
20 November 2014 12:43:23
Also to be considered but forgoten every season are the Hadley and Ferrel cells position and displacement...this year they are quite dynamic in the NH...
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Jonesy
21 November 2014 10:36:55

I think people forget we are not actually in Winter yet and winter lasts 3 months and apart from rare occasions like 2010 to get widespread cold and snow Pre-Christmas is very rare for our small Island. ( count the number of White Christmases )


People need to stop worrying, it's because of last year that the panic and the search for cold is driving some people insane so far this AUTUMN.


How many times have we seen charts show a lot of snow potential only for it to fail at t72 etc. The more you search and want something the less likely it is to get it, we could all be very surprised this Winter within a short space of time, I think something will pop up when we don't expect it and then it's game on. ....Look how America changes so quickly, high temps, freezing temps and loads of snow then due to be going back to average/high temps.


If by the middle of Jan things still look on the above average side then may be that's the time to start to worry or potentially rule out another winter cold lovers.


Anyone that rules out Winter at this stage is brave but they do it mainly because there chances of being correct will always be greater for our small island.


It's funny because we could get two days of seeing snowfall and a week of cold and it would be classed as a great winter by some.


Medway Towns (Kent)
The Weather will do what it wants, when it wants, no matter what data is thrown at it !
Saint Snow
21 November 2014 11:02:05

( count the number of White Christmases )


Originally Posted by: Jonesy 


 


3 in the last 10 years IMBY 


 


You're right, though, we're still in autumn. However, as I've said before, snow & cold in the lead up to Xmas is nirvana for me.


Trouble with this upcoming winter is that there's so much hope & expectation. I reckon this comes from the 09/10 & 10/11 winters both having good, prolonged cold/snowy periods, whilst 12/13 also saw many have spells of cold & snow (albeit each much more short-lived). It raises expectations, reminds people that winter is still possible! I also think some people were 'snowed out' after the early winter 2010 record-breaking cold outbreak, but now have some of that hunger back - especially as the 2013/14 winter was a depressing mild washout.


And then we have the guarded excitement of the OPI thing (more than balanced out on the negative side IMO by most professional (ie, not charlatan) weather organisations shying away from a cold winter). And, of course, we've all be casting an envious eye toward part of the US who've have wondrous levels of snow this week.


So, jittery excitement levels are up - and seeing a possible early taste of cooler, more 'seasonal' conditions in the charts the other day will have raised anticipation, only for any charts showing this potential to soon back away and show us more mild, wet crap in the reliable timeframe.


I'm still hoping that from mid-Dec we get a cold & snowy period to take us into 2015. Unfortunately, current output is showing no signs of even a twinkle in the Met Gods' eye for a switch to more wintry weather.



Martin
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Jonesy
21 November 2014 11:15:43


 


I'm still hoping that from mid-Dec we get a cold & snowy period to take us into 2015. Unfortunately, current output is showing no signs of even a twinkle in the Met Gods' eye for a switch to more wintry weather.


Originally Posted by: Saint Snow 


Wouldn't a lovely Christmas Present be that the charts around the festive season start to show something for Mid Jan..slap bang in the middle of Winter 


Medway Towns (Kent)
The Weather will do what it wants, when it wants, no matter what data is thrown at it !
Jonesy
21 November 2014 12:23:10

Just seen what date it is today.....21st


Only One Month till The Winter Solstice ....and the days start getting longer 


Medway Towns (Kent)
The Weather will do what it wants, when it wants, no matter what data is thrown at it !
Chiltern Blizzard
21 November 2014 14:06:06

Indeed, it is still autumn.... I remember around Christmas/New Year 2012/13 the charts were looking particularly bad with SW dominating the entire model runs (after the tease we'd had earlier in December that year) for day after day..... then by mid-January I had 5" of lying snow, a run of ice days and snowcover for 10 days - job done.  Despite all the bluster, I think all most 'coldies' are looking is a proper wintry spell iin their back yard - a fortnight of snow and freezing temperatures at some point over the next 3-4 months and most people would be happy....  If one's happiness is dependent on a 3 month freeze you really should build a cabin at the top of the Cairngorms or emigrate. 


What I'd really like to see is a deep cold spell a la 87 or 91 that gives all of us some wintry weather, even those on Cornish coasts, as the understandable frustration of those in ill-favoured locations puts a dampener on those of us lucky people who live in more favoured spots.  In fact (and I know weather doesn't work like this) we're "due" one.


 



I think people forget we are not actually in Winter yet and winter lasts 3 months and apart from rare occasions like 2010 to get widespread cold and snow Pre-Christmas is very rare for our small Island. ( count the number of White Christmases )


People need to stop worrying, it's because of last year that the panic and the search for cold is driving some people insane so far this AUTUMN.


How many times have we seen charts show a lot of snow potential only for it to fail at t72 etc. The more you search and want something the less likely it is to get it, we could all be very surprised this Winter within a short space of time, I think something will pop up when we don't expect it and then it's game on. ....Look how America changes so quickly, high temps, freezing temps and loads of snow then due to be going back to average/high temps.


If by the middle of Jan things still look on the above average side then may be that's the time to start to worry or potentially rule out another winter cold lovers.


Anyone that rules out Winter at this stage is brave but they do it mainly because there chances of being correct will always be greater for our small island.


It's funny because we could get two days of seeing snowfall and a week of cold and it would be classed as a great winter by some.


Originally Posted by: Jonesy 


Rendlesham, Suffolk 20m asl
Stormchaser
21 November 2014 14:32:54

Just to outline what the Cohen theory that I've been mentioning here and there of late predicts, here are some informative Tweets by a bloke called Eric Webb:


https://twitter.com/webberweather/status/535753762603036673


https://twitter.com/webberweather/status/535759982466445312


 


To summarise, we're very much on track as far as the theory goes, and so following a period of stronger polar vortex action, we can expect - from this theory - a dramatic transition to a heavily blocked regime with a positive AO and NAO, and low pressure tracking initially right through the UK in December, then increasingly far south through January and February.


A sudden stratospheric warming event (SSW) appears to most likely in late December or early January, so the most dramatic conditions may be reserved for the second half of the winter.


Note that, even if the theory pans out, this does not guarantee a cold winter or even lengthy cold spell in the UK, though it certainly raises the odds. Saying that it will lead to such things is the misinterpretation that many media examples just love to make.


 


It sure looks like this winter will be a very good test of Cohen's theory, which could have significant implications for long range forecast attempts in future years.


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Brian Gaze
21 November 2014 20:28:11

What puzzles me about all this strat talk is whether it overrides all other forcing mechanisms such as SSTs? A correlation between North Atlantic SSTs and the pressure patterns during the winter months has been established. Are we now saying that's all junk? If so then doesn't the same logic about the strat follow? In a few years time the next theory comes along causing the current strat one to become junk.


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Berkhamsted
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Saint Snow
21 November 2014 20:49:17


What puzzles me about all this strat talk is whether it overrides all other forcing mechanisms such as SSTs? A correlation between North Atlantic SSTs and the pressure patterns during the winter months has been established. Are we now saying that's all junk? If so then doesn't the same logic about the strat follow? In a few years time the next theory comes along causing the current strat one to become junk.


Originally Posted by: Brian Gaze 


 


Alternatively, they're all part of a very complex jigsaw, and looking at one or two pieces in isolation is never going to allow anyone to work out the general synoptics for a coming season.



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
Brendon Hills Bandit
21 November 2014 21:23:03
There does seem to exist a paranoia that this coming winter will turn out to be like last winter, a paranoia that I feel sometimes. Think that this maybe skews people's judgement sometimes.
220m asl, edge of Brendon Hills
KevBrads1
22 November 2014 07:24:15
This is an interesting site, I think it is updated weekly. Gives thoughts on possible outcome in the near future.

http://www.aer.com/science-research/climate-weather/arctic-oscillation 
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nickl
22 November 2014 08:12:56


 


 


Alternatively, they're all part of a very complex jigsaw, and looking at one or two pieces in isolation is never going to allow anyone to work out the general synoptics for a coming season.


Originally Posted by: Saint Snow 


probably this. Working out which bits of the jigsaw need to be weighted more heavily is possibly the trick. overall, is winter looks to be landing on the blocked side with the Siberian high the main player. whether the little old uk is too far west will be the question.

Gooner
22 November 2014 09:02:33

This is an interesting site, I think it is updated weekly. Gives thoughts on possible outcome in the near future.

Originally Posted by: KevBrads1 

">http://www.aer.com/science-research/climate-weather/arctic-oscillation


Very good and also in simplistic terms ................which is good for me


Remember anything after T120 is really Just For Fun



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roger63
22 November 2014 11:03:56


What puzzles me about all this strat talk is whether it overrides all other forcing mechanisms such as SSTs? A correlation between North Atlantic SSTs and the pressure patterns during the winter months has been established. Are we now saying that's all junk? If so then doesn't the same logic about the strat follow? In a few years time the next theory comes along causing the current strat one to become junk.


Originally Posted by: Brian Gaze 


I wish people would look at the factual evidence on SSW events.In the data range 1979 to 2012 I identified 15 winter events.In the month following the event 9 were followed by CET' s below normal ie the split cold :warm 60:40 and given the small sample  size not statistically significant.


SSW,s is one of the many indicators and none of them on their own is 100% right!Even if one could forecast NAO,accurately(via the SST link) the correlation with CET is at best 0.66.

Brian Gaze
22 November 2014 12:31:58

Roger63 - agree with everything you've just said.


On a different note does anyone know what has happened to this month's Glosea update? Should it not be online by now?


Brian Gaze
Berkhamsted
TWO Buzz - get the latest news and views 
"I'm not socialist, I know that. I don't believe in sharing my money." - Gary Numan
some faraway beach
22 November 2014 19:07:22


 


I wish people would look at the factual evidence on SSW events.In the data range 1979 to 2012 I identified 15 winter events.In the month following the event 9 were followed by CET' s below normal ie the split cold :warm 60:40 and given the small sample  size not statistically significant.


SSW,s is one of the many indicators and none of them on their own is 100% right!Even if one could forecast NAO,accurately(via the SST link) the correlation with CET is at best 0.66.


Originally Posted by: roger63 


Sure, if you lump all SSWs together, that's the outcome and you can ignore them. 


The interest comes from refining the study to determine which types (straight up or "over-the-top") and locations of stratospheric warming are most likely to downwell and split the polar vortex favourably for cold in the UK. (My understanding is that we're looking for stratospheric warmth travelling west to east from above Siberia to above Alaska, but I'd love to see a discussion on this forum which could enlighten me on this.)


Fundamentally events in the strat are an integral part of the modelling which provides the charts over which we pore during the winter. Why not try to understand how it all works? 


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.
23 November 2014 16:57:27


 


I wish people would look at the factual evidence on SSW events.In the data range 1979 to 2012 I identified 15 winter events.In the month following the event 9 were followed by CET' s below normal ie the split cold :warm 60:40 and given the small sample  size not statistically significant.


SSW,s is one of the many indicators and none of them on their own is 100% right!Even if one could forecast NAO,accurately(via the SST link) the correlation with CET is at best 0.66.


Originally Posted by: roger63 


 


Hi Roger63


From my understanding the SSW's do significantly increase the likely hood of cold/snowy outbreaks for these shores if other factors such as easterly QBO, weak El nino are high SAI are favourable to us ( as indeed they are this year). It has not been suggested by those who study the subject that any old SSW  is an automatic shoe in for cold weather in the UK.


So as you say not a 100% indicator by any means but probably the biggest  indicator when other factors are also in our favour.


It would be interesting to see the correlation of those  winter events if you took out those that didn't have an easterly QBO weak el nino and high SAI, I'm pretty sure it would probably be a lot better than 60:40.  It is interesting to note that even taking the 15 winter events you identified that the cold still came out on top.

23 November 2014 17:04:50


What puzzles me about all this strat talk is whether it overrides all other forcing mechanisms such as SSTs? A correlation between North Atlantic SSTs and the pressure patterns during the winter months has been established. Are we now saying that's all junk? If so then doesn't the same logic about the strat follow? In a few years time the next theory comes along causing the current strat one to become junk.


Originally Posted by: Brian Gaze 


 


Brian I don't think its necessarily a case of a new theory coming along and junking past theories more a case of each new theory coming along and hopefully adding cumulatively to the  body of knowledge we need in order to improve seasonal forecasting.

Solar Cycles
23 November 2014 20:35:46


 


 


Brian I don't think its necessarily a case of a new theory coming along and junking past theories more a case of each new theory coming along and hopefully adding cumulatively to the  body of knowledge we need in order to improve seasonal forecasting.


Originally Posted by: blizzard of 78 

 Maybe we should stick to seaweed and berries on trees.

Russwirral
24 November 2014 11:04:16

http://www.jamstec.go.jp/frcgc/research/d1/iod/e/seasonal/outlook.html


 


Jamstec has made an update.


 


Temperatures close to average if not a little above with a cold ireland.  So no real strong inclination to any temperature pattern for our part of the world.


 


Slightly drier out to the atlantic to our north west, which would be interesting if it relates to blocking towards greenland.


Russwirral
24 November 2014 12:06:39
http://www.theweatheroutlook.com/twodata/datmdlout.aspx 

CFS today is looking lovely. Thought it hasnt been consistent lately very turbulent. Still - showing nice Scandi blocking for Decemeber, with the HP loooking to move north then east through Jan and feb.
tallyho_83
24 November 2014 13:40:21
Any chance of sleet in the rain tomorrow - as this band of rain moves up from the south - max is around 5c and rain falling in temps of freezing or just above?
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Russwirral
24 November 2014 13:47:00

Any chance of sleet in the rain tomorrow - as this band of rain moves up from the south - max is around 5c and rain falling in temps of freezing or just above?

Originally Posted by: tallyho_83 


 


Very doubtful.  There is cold are around the Bristol area tomorrow, but probably driven by fog etc.


The cold air you are thinking about is more surface, the atmosphere above is actually alot warmer.  If it had been cold for a long period - this would probably be freezing rain territory.  However the Cold is very short lived.


The type of phenomena you speak of works well in scenarios where all conditions are almost cold enough.  The evaporative cooling then pushes it over the line into snow.


Weatherstu
24 November 2014 16:02:44


http://www.jamstec.go.jp/frcgc/research/d1/iod/e/seasonal/outlook.html


 


Jamstec has made an update.


 


Temperatures close to average if not a little above with a cold ireland.  So no real strong inclination to any temperature pattern for our part of the world.


 


Slightly drier out to the atlantic to our north west, which would be interesting if it relates to blocking towards greenland.


Originally Posted by: Russwirral 


 


I wouldn't worry about this, they came up with the same solution in 2009 and we all know what happened there!!!!


 



 


 

Weatherstu
24 November 2014 16:10:02

Hi guys,


 


Just a quick post regarding the MJO, it seems like the phases are heading in a very favorable direction in December with phase 7 looking likely at some stage. The corresponding geopotential height anomaly is very interesting and would certainly prove to be a cold shot should this pattern develop. Very much like the 2009 MJO pattern.


 


 


 


http://www.americanwx.com/raleighwx/MJO/MJO/DecemberPhase7all500mb.gif


 


 


 

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