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Quantum
10 November 2014 12:38:59

My interpretation of all this is that we will eventually see a cold spell at the very least, but we are going to have to wait for it. In 2010 the atlantic started to stall on the 16th or 17th. 



The subsequent situation of psedo-cold easterlies is quite similar:



And it took until the 24th for proper cold to arrive:



The transition from southerly blocking to northerly blocking seems somewhat slower, so the absolute earliest we can expect a cold incursion is on the 21st but realistically it could be up to a week longer. 


 


2023/2024 Snow days (approx 850hpa temp):
29/11 (-6), 30/11 (-6), 02/12 (-5), 03/12 (-5), 04/12 (-3), 16/01 (-3), 18/01 (-8), 08/02 (-5)

Total: 8 days with snow/sleet falling.

2022/2023 Snow days (approx 850hpa temp):

18/12 (-1), 06/03 (-6), 08/03 (-8), 09/03 (-6), 10/03 (-8), 11/03 (-5), 14/03 (-6)

Total: 7 days with snow/sleet falling.

2021/2022 Snow days (approx 850hpa temp):

26/11 (-5), 27/11 (-7), 28/11 (-6), 02/12 (-6), 06/01 (-5), 07/01 (-6), 06/02 (-5), 19/02 (-5), 24/02 (-7), 30/03 (-7), 31/03 (-8), 01/04 (-8)
Total: 12 days with snow/sleet falling.
Brian Gaze
10 November 2014 12:53:15


The transition from southerly blocking to northerly blocking seems somewhat slower, so the absolute earliest we can expect a cold incursion is on the 21st but realistically it could be up to a week longer. 


 


Originally Posted by: Quantum 


If you're right we should be starting to see some dippers appearing on the GEFS but there's still nothing of note on the 6z suite.  



One thing that leaves me cold (pun intended) about all this strat talk is that it isn't an external forcing mechanism which the NWP doesn't model. 


Brian Gaze
Berkhamsted
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"I'm not socialist, I know that. I don't believe in sharing my money." - Gary Numan
Polar Low
10 November 2014 12:59:01

Both are having a very hard time and at  panic to resolve the issue of hights into Europe I look daily and neither at the moment are not very sure at all something seems to be worry them a lot we must get on the cold side of the jet to have a chance.


http://mp1.met.psu.edu/~fxg1/ECMWF_0z/hgtcomp.html


 

Polar Low
10 November 2014 13:06:24

we want to see something like this soon the charts at the moment seemed to be a right **ick tease for me at the moment.


 



 

Stormchaser
10 November 2014 14:46:32

Not necessarily soon Polar Low. For some of the best interpretation of the longer-range prospects that I've read, here's a post from early this afternoon on the other site by Tamara, a very well informed contributor over there. I hope she doesn't mind me quoting her here:


 



"The model output this morning continues to consolidate the pattern for the short term with continued surface trough disruption and unsettled conditions for the UK against a macro NH pattern which is altogether much more appealing for the long term.


As expected, the models are converging on a solution in the 10 day period that excludes height rises over Greenland and any meaningful attempt to back Siberian cold westwards. The ECM has adjusted its bullish suggestions accordingly and consensus settles around a trough disruption graveyard just to our west or over the UK.  We might expect this cyclonic pattern to persist for the greater part of the 10 day period.


As the models thereafter start to fade the modest height anomaly to the north of the British Isles and the AO trends less negative, this heads towards the last week or so period of November where at face value the large scale pattern may look much less appealing than now (as referred to yesterday) but in fact it represents a time when interest of proper future cold prospects has greater justification than it does at present.


The latest words from the Italians, representing Cohen's very latest thinking on their stratospheric thread, give a very interesting insight into what is happening right now in the large scale NH pattern which increasingly looks to have significant repercussions on what lies ahead as we approach the pre-festive period. It should also increase anticipation very nicely of the imminent Cohen update on the conclusions from the finishing stats on the OPI.



I think that an endorsement will follow in this update that what we are seeing advertised in the models right now is a typical strong SAI pattern/progression. The role that Super-Typhoon Nuri plays in this, looks set to have accelerated the -AO feedback loops and might have mouth-watering prospects further down the line for seasonal shopping.



The position and depth of this low in tandem with the current heights between Russia and Scandinavia are ripely primed to activate serious wave propagation in the stratosphere. Obviously this type of hope and expectation is already documented in threads on these pages. 


It does seem that what we might hear from the upcoming report is confidence expressed that a significant warming is set to occur in response to the current NWP situation. This warming looks primed to occur around the turn of the month, or soon after.


This means that fading of the present -AO spike, as I suggested in my post yesterday (and expect towards months end) could well be occurring right at the time when activity on the stratosphere thread is peaking ever higher towards anticipation of something much greater and more significant for these Isles than the cyclonic wash-out that the 'interesting' macro pattern promises right now.


Such a fading of the polar heights, as the -AO state (temporarily) relaxes, is a classic precursor to an even stronger rebound in December, again as stated by me yesterday.



A very wet and frankly dismal November is on the cards for many of us, but sludge and muck in November might lead to ice capable of bearing a duck towards Christmas."



 


This pretty much summarises what I've been trying to put together during the past few days, except for the temporary transition to less negative AO prior to a strong rebound, which I can recall coming across a year or two ago but had since forgotten.


If you have any problems or queries relating to TWO you can Email [email protected]

https://twitter.com/peacockreports 
2023's Homeland Extremes:
T-Max: 30.2°C 9th Sep (...!) | T-Min: -7.1°C 22nd & 23rd Jan | Wettest Day: 25.9mm 2nd Nov | Ice Days: 1 (2nd Dec -1.3°C in freezing fog)
Keep Calm and Forecast On
Quantum
10 November 2014 16:26:51

One crude way to gauge blocking quality is to watch that 552 line on the 500mb height maps. If it just touches greenland its borderline, half way across is promising, and all of greenland you know something good is on the way!


2023/2024 Snow days (approx 850hpa temp):
29/11 (-6), 30/11 (-6), 02/12 (-5), 03/12 (-5), 04/12 (-3), 16/01 (-3), 18/01 (-8), 08/02 (-5)

Total: 8 days with snow/sleet falling.

2022/2023 Snow days (approx 850hpa temp):

18/12 (-1), 06/03 (-6), 08/03 (-8), 09/03 (-6), 10/03 (-8), 11/03 (-5), 14/03 (-6)

Total: 7 days with snow/sleet falling.

2021/2022 Snow days (approx 850hpa temp):

26/11 (-5), 27/11 (-7), 28/11 (-6), 02/12 (-6), 06/01 (-5), 07/01 (-6), 06/02 (-5), 19/02 (-5), 24/02 (-7), 30/03 (-7), 31/03 (-8), 01/04 (-8)
Total: 12 days with snow/sleet falling.
idj20
10 November 2014 16:48:49

The latest GFS output is toying about with the idea of a blocked pattern over the UK at the low res end of the run. Okay, it is too early to think about getting proper cold and snow out of it and even that is a long way off in forecasting terms (one of many runs), but anything to keep the volatile Atlantic at bay will be most welcomed.


Folkestone Harbour. 
Brian Gaze
10 November 2014 16:49:39

Anyone for a Spanish Plume?



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
Stormchaser
10 November 2014 16:52:17

I've just moved some posts regarding the Met Office contingency planners preliminary probability outlook to the 'Winter 2014/15' thread where they will be more at home 


 


The GFS 12z op run has increased the amount of rain across the SW'rn third of the UK from the current Mon-Wed event, and adds a large amount to the Thursday-Saturday event due to the low pressure system disrupting more than on previous runs, which stalls the front more readily and then has it pivoting towards a SE-NW alignment while waves of wet weather run up along it - much like the current event, but perhaps more energetic in nature... in other words delivering even larger rain totals.


The Met Office weather warnings cover this pretty much perfectly, suggesting they were at least one step ahead of the GFS 12z op run.


If you have any problems or queries relating to TWO you can Email [email protected]

https://twitter.com/peacockreports 
2023's Homeland Extremes:
T-Max: 30.2°C 9th Sep (...!) | T-Min: -7.1°C 22nd & 23rd Jan | Wettest Day: 25.9mm 2nd Nov | Ice Days: 1 (2nd Dec -1.3°C in freezing fog)
Keep Calm and Forecast On
Zubzero
10 November 2014 17:02:06

If only it was January 


http://modeles.meteociel.fr/modeles/gfsp/runs/2014111012/gfsnh-0-186.png?12


 


Still mild with any cold air a million a miles away


http://modeles.meteociel.fr/modeles/gfsp/runs/2014111012/gfsnh-9-180.png?12

Stormchaser
10 November 2014 17:07:05

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.


The majority of the model output now indicates that the blocks aren't likely to fall into the right place this month for a cold, snowy period in the UK. This is hardly surprising, given that even those few runs with particularly impressive blocking in the right sort of places have struggled to produce such conditions away from Scotland.


On the plus side, this run allows a decent mid-latitude block to provide dry conditions to much of the UK days 10-16, and this has been an emerging trend recently thanks to the Atlantic jet looking to remain fairly weak even as the polar vortex gathers itself.


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.


This is the relaxation of the -ve AO state that Tamara was detailing earlier today. I would not be surprised to see this gain some ground for the Nov-Dec transition period.


If you have any problems or queries relating to TWO you can Email [email protected]

https://twitter.com/peacockreports 
2023's Homeland Extremes:
T-Max: 30.2°C 9th Sep (...!) | T-Min: -7.1°C 22nd & 23rd Jan | Wettest Day: 25.9mm 2nd Nov | Ice Days: 1 (2nd Dec -1.3°C in freezing fog)
Keep Calm and Forecast On
sriram
10 November 2014 17:10:44
Just seen gavin Partidge's update

Sod's law that we are close to a cold spell but not close enough

I fear that this is going to be the story of our winter

Sriram
Sedgley, West Midlands ( just south of Wolverhampton )
162m ASL
Russwirral
10 November 2014 17:21:40

Just seen gavin Partidge's update

Sod's law that we are close to a cold spell but not close enough

I fear that this is going to be the story of our winter

Originally Posted by: sriram 


 


Im not so sure.  Ive spoke before about looking for patterns that repeat themselves and often are present in the autumn into winter months.  as the post a bit further up mentions - if only it was January.  Wouldnt be surprised to see this pattern repeat itself in another 4 weeks, with a bit more cold air involved.  which for me, would be ideal in advent.


David M Porter
10 November 2014 17:35:24


Anyone for a Spanish Plume?



Originally Posted by: Brian Gaze 



I somehow doubt though that it'll be as mild again as it was on Halloween. The HP over the continent looks to me to be located a bit further north on that run that was the case in late October.


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
LA2B MeridFlowEuro09
10 November 2014 17:36:16

The GFS and UKMO are able to get the idea going for 144hrs and it's up in the AIR searching for clues after that.


Large UK and Mid-N and Central N and E N Atlantic Persistant Area of Combined Low's as a Major Low, we get mild and with spells of rain some heavy with some dry sunny areas and spells of sun, with scattered heavy showers as well, Winds from South and SW mostly.


Right in to Sat/ Sunday the coming weekend.


What they do later (Following Week).


The Current Low will move East SE with UK weather turning to Ridges of High P. With Far N and NW Atlantic seeing return to Low Pressure move on a more Arctic SW and S side tracking.


😃💦💭


Climate is warming up, Scotland and N Ireland and North England still often gets some Winter frost, ice and snow, November to March, but the SE and South UK including S Central England and Wales, together with the West and North through the year, they sometimes get more rain than London and S SE England, where some longer dry fine spells without much heavy rain is seen every year.

The North Atlantic Sea often gets some much Colder Wintry conditions from November to March Months, and Mild SW and South winds tend to be more frequent over the East and SE of North Atlantic Sea, as the Azores High tends to stay in charge. 

With this warmth and heat, the Central and South UK has become mostly free of snow and frost.
Matty H
10 November 2014 17:37:08

Just seen gavin Partidge's update

Sod's law that we are close to a cold spell but not close enough

I fear that this is going to be the story of our winter

Originally Posted by: sriram 


Hopefully. I'll take those temps on the chart Brian has posted. A bit less rain wouldn't go a miss. 


Polar Low
10 November 2014 17:40:39

Perhaps mrs T is a little late in her thoughts< James dont right off November just yet


 



 


 


 


 


 


 


 


 


 



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.


The majority of the model output now indicates that the blocks aren't likely to fall into the right place this month for a cold, snowy period in the UK. This is hardly surprising, given that even those few runs with particularly impressive blocking in the right sort of places have struggled to produce such conditions away from Scotland.


On the plus side, this run allows a decent mid-latitude block to provide dry conditions to much of the UK days 10-16, and this has been an emerging trend recently thanks to the Atlantic jet looking to remain fairly weak even as the polar vortex gathers itself.


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.


This is the relaxation of the -ve AO state that Tamara was detailing earlier today. I would not be surprised to see this gain some ground for the Nov-Dec transition period.


Originally Posted by: Stormchaser 

Medlock Vale Weather
10 November 2014 17:51:13

Good heavens, frost as far south as the Florida Panhandle & Tex-Mex border  surely some records to be broken



Alan in Medlock Valley - Oldham's frost hollow. 103 metres above sea level.
What is a frost hollow? http://www.weatheronline.co.uk/reports/wxfacts/Frost-hollow.htm 
Charmhills
10 November 2014 17:58:02


Anyone for a Spanish Plume?



Originally Posted by: Brian Gaze 


BBQ's at the ready!


Loughborough, EM.

Knowledge is power, ignorance is weakness.

Duane.
Gooner
10 November 2014 18:02:40


Anyone for a Spanish Plume?



Originally Posted by: Brian Gaze 


Don't be fooled though Brian ( doubt you are ) single digit temps I should think


 


http://www.wetterzentrale.de/pics/Rtavn26417.gif


Remember anything after T120 is really Just For Fun



Marcus
Banbury
North Oxfordshire
378 feet A S L


Gooner
10 November 2014 18:51:14

http://www.meteociel.fr/modeles/ecmwf/runs/2014111012/ECH1-216.GIF?10-0


Fog and Frost


Seasonal at least


Remember anything after T120 is really Just For Fun



Marcus
Banbury
North Oxfordshire
378 feet A S L


JACKO4EVER
10 November 2014 18:52:59


http://www.meteociel.fr/modeles/ecmwf/runs/2014111012/ECH1-216.GIF?10-0


Fog and Frost


Seasonal at least


Originally Posted by: Gooner 


I can live with that Marcus- hopefully some good useable dry weather in the offing 

Gooner
10 November 2014 18:56:01


 


I can live with that Marcus- hopefully some good useable dry weather in the offing 


Originally Posted by: JACKO4EVER 


Wouldn't disagree with that Jacko , a decent end to the Autumn........hopefully


Remember anything after T120 is really Just For Fun



Marcus
Banbury
North Oxfordshire
378 feet A S L


bledur
10 November 2014 19:04:09

North Atlantic Oscillation  showing signs of a going into negative so easterly winds will become more likely. Quite a dip in early Feb but that is a long way off. The negative around the 19 th  of Nov shows a cooling down , but not real cold.


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