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David M Porter
25 November 2015 19:45:44


But we've all been here long enough to know that the MetO medium range forecast can and do change often, I'm not implying that they will but we shouldn't place all our eggs in one basket, just yet.


Originally Posted by: Solar Cycles 


Agree completely SC.


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
doctor snow
25 November 2015 20:24:27
Hi does any one know about strat warming at the moment jo was talking about it happning on weather bell .models have not picked up on this ?
Brian Gaze
25 November 2015 21:30:06

Hi does any one know about strat warming at the moment jo was talking about it happning on weather bell .models have not picked up on this ?

Originally Posted by: doctor snow 


I should have some new strat charts on TWO within the next week. They'll be added to the chart viewer.


 


Brian Gaze
Berkhamsted
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doctor snow
25 November 2015 21:35:42


 


I should have some new strat charts on TWO within the next week. They'll be added to the chart viewer.


 


Originally Posted by: Brian Gaze 

excellent 

some faraway beach
25 November 2015 22:37:39


 


But I would hope that you would accept the facts, and that if it has the best verification stats then it can be trusted just that little bit more than the other models? 


Originally Posted by: Whether Idle 


What do the verification stats have to do with identifying over-amplification as the reason for the times the ECM does not verify?


Unless the model has a verification of 100%, then it must by definition be getting it wrong sometimes. All that Solar Cycles is doing is offering his opinion on one possible cause of those instances of non-verification. 


I haven't an opinion on whether he's right or wrong, but the verification stats are irrelevant to the question.


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.
Russwirral
25 November 2015 23:06:56

Consistent theme now developing in FI of a scandi high. Tonights Scandi high, takes on a less cold personality, though - europe already pretty cold means UK will be barely above zero. Seems quite dry - with a risk of this turning into a euro High with southerly winds.

Most probably will turn into a frosty period.


 


Edit - for those of you scanning through the threads - December is looking


 


http://www.theweatheroutlook.com/twodata/chart.aspx?chart=/charts/gfs/18_384_2mtmp.png?cb=612


Karl Guille
25 November 2015 23:11:50
Just beat me to it! Still way too far out in FI and currently with little support from previous ensembles, but at least the GFS 18z is following a similar pattern to the 12z. Should at least make the ensembles a little more interesting to watch.
St. Sampson
Guernsey
Stormchaser
26 November 2015 00:07:32

Essentially, the GFS op is managing to severely disrupt the polar vortex using in large part an Arctic High that's prominent in around 10 days time. It somehow achieves this in the face of a fairly potent stratospheric vortex, which leads to questions regarding the possible effect of the distribution of sea ice deficits, for example. These are hard to assess as it's easily possible that the op run is overdoing things.


Interestingly enough, ECM does have that Arctic High at day 10 now, which wasn't the case on its 00z op run, and there are signs that the polar vortex could split apart in the following days - in similar fashion to GFS.


 


The ECM ensembles don't seem to offer much help on the face of it, with a very wide spread of outcomes:


http://www.weerplaza.nl/15daagseverwachting/?type=eps_pluim


...which is disappointing as I daren't pay too much attention to the GEFS until they receive their much-delayed upgrade early next month which will bring them a lot closer to the operational in terms of the levels of the atmosphere and - I believe - the horizontal resolution.


 


The money remains on a zonal December for the time being but these Arctic Highs and the lack of coherent strat. to trop. coupling are starting to raise a few eyebrows in the scientific community. Just a little, but still...!


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nsrobins
26 November 2015 07:20:50
Something of a move away from the recent potential for height rises to the NE late in the range across the board this morning.
The focus should be on the chance of one or two significant wind events in the next five days.
Neil
Fareham, Hampshire 28m ASL (near estuary)
Stormchaser, Member TORRO
JACKO4EVER
26 November 2015 07:41:05
Morning all, a quick look through things and a very mobile generally Atlantic dominated flow looks on the cards with one or two stormy bouts thrown in for good measure. It shouldn't feel too mild in the wind though temperatures look to be generally a little above average as we head into December
Solar Cycles
26 November 2015 08:04:22


Essentially, the GFS op is managing to severely disrupt the polar vortex using in large part an Arctic High that's prominent in around 10 days time. It somehow achieves this in the face of a fairly potent stratospheric vortex, which leads to questions regarding the possible effect of the distribution of sea ice deficits, for example. These are hard to assess as it's easily possible that the op run is overdoing things.


Interestingly enough, ECM does have that Arctic High at day 10 now, which wasn't the case on its 00z op run, and there are signs that the polar vortex could split apart in the following days - in similar fashion to GFS.


 


The ECM ensembles don't seem to offer much help on the face of it, with a very wide spread of outcomes:


http://www.weerplaza.nl/15daagseverwachting/?type=eps_pluim


...which is disappointing as I daren't pay too much attention to the GEFS until they receive their much-delayed upgrade early next month which will bring them a lot closer to the operational in terms of the levels of the atmosphere and - I believe - the horizontal resolution.


 


The money remains on a zonal December for the time being but these Arctic Highs and the lack of coherent strat. to trop. coupling are starting to raise a few eyebrows in the scientific community. Just a little, but still...!


Originally Posted by: Stormchaser 

Indeed and my best guesstimate remains a possibility.

sizzle
26 November 2015 09:38:42

I don't see no sign of cold/snow in the netweather  long range forecast tho I wont take any long range forecast as gospel

SEMerc
26 November 2015 09:53:17

Horrendous charts this morning. Must be due to 'missing data'. We haven't trotted that one out yet.

Saint Snow
26 November 2015 09:59:50


I don't see no sign of cold/snow in the netweather  long range forecast


Originally Posted by: sizzle 


 


Does that mean you do see signs of cold/snow?


 


 



Martin
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Sevendust
26 November 2015 10:04:07

Something of a move away from the recent potential for height rises to the NE late in the range across the board this morning.
The focus should be on the chance of one or two significant wind events in the next five days.

Originally Posted by: nsrobins 


Not seeing anything significantly cold either. Looks pretty zonal and probably quite mild overall allowing for the swings between tm and pm air masses.

Stormchaser
26 November 2015 10:09:13


I don't see no sign of cold/snow in the netweather  long range forecast tho I wont take any long range forecast as gospel


Originally Posted by: sizzle 


The double negative makes me unsure what you mean, but their long range effort is strongly in favour of a SSW in early Jan with a significant cold spell in the middle of the month. Far from a done deal of course - in fact I'm amazed at how bold they have been there.


 


The Arctic High is still there and messing with the polar vortex on the GFS 00z op run, but the Atlantic trough wins the first battle with signs of a possible detour away from the Atlantic regime taking until days 15-16 to even start to emerge.


ECM might be a different story going forward from day 10 with a gain in latitude of high pressure likely - but the outcome could easily be a strong UK based high pressure cell. It'd be a nice break from the westerlies though, and potentially becoming cold at the surface. All speculative of course and starting from too far ahead to place any faith in.


 


We already have enough disagreement within 4 days range, as GFS has a nasty shortwave system grazing the far north as it races east on the periphery of the parent trough, bringing some gusts well into the 80's with near 100 mph out at sea:


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. 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.


 


...yet ECM makes a lot less of that feature, choosing instead to show more development of a shallow disturbance along the trailing polar front Mon-Tue, enough to tighten the isobars across the south while the north is merely breezy following a very brief spell of stronger winds on Sunday as that shortwave low zips through (its just off the Norwegian coastline in the chart below-left):


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. 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.


I've also posted the ECM day 10 chart from the polar perspective just to illustrate the presence of the Arctic High and it's effect on the polar vortex which is essentially split into multiple lobes. If it wasn't for that shortwave S of Greenland I daresay it would be a more interesting chart from the N. Atlantic/Europe perspective - as it is it goes to show the kind of complications that are usually overlooked at the longer range.


 


Generally speaking I would be surprised not to see an Atlantic regime dominate December 2015, but I suspect the setup may be a bit more unstable than usual, with more room for a deviation here and there that brings a cold snap with wintry weather pushing south for a short time.


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JOHN NI
26 November 2015 11:07:26
0600 GFS OP has turned to a mildfest which is not that surprising either and would be my choice of options. Some ridiculous warmth for eastern Scotland if some of the warm conveyors being shown were to materialise. At the moment, still no sign of serious cold and all in keeping with current ENSO signals for winter in northwest Europe - not saying it stay like that all winter though. 🙂
John.
The orange County of Armagh.
Russwirral
26 November 2015 16:47:10
Though its been missing for the last 2 runs - again FI targets a scandi HP (though on this run it smells a little bit like a Euro)

I think ive seen about 8 different ways to make a Scandi HP this week.

What this also shows though - is that we may get a Scandi HP - but if the isobars are correctly placed - we risk getting mild air from the Med.
Russwirral
26 November 2015 16:56:37
Next Thursday on wards looks pretty frosty - good start to Winter!
LA2B MeridFlowEuro09
26 November 2015 17:05:32

 


For the next 9 days to 5th December the Weather Outlook is for often dry and fine mild weather over Central and South SE UK, with the expected weather in the north, West NW and mid to far North seeing some wet and rainy weather with brief colder interludes in North and NW UK.


High Pressure close to SE and South UK but here often mild with just afew chilly cool days, and occasional clear skies/ sunny or clear spells.  And it could for a few days get cold even in the South with risk of ground or air frost 2 or 3 days.


More updates from me may be by Thursday next week.


2 or 3 days of WestNW or even NW airflow in all parts are expected.


Often very windy with very heavy rain over NW and the North UK.


 


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.
Gooner
26 November 2015 17:29:24


 


For the next 9 days to 5th December the Weather Outlook is for often dry and fine mild weather over Central and South SE UK, with the expected weather in the north, West NW and mid to far North seeing some wet and rainy weather with brief colder interludes in North and NW UK.


High Pressure close to SE and South UK but here often mild with just afew chilly cool days, and occasional clear skies/ sunny or clear spells.  And it could for a few days get cold even in the South with risk of ground or air frost 2 or 3 days.


More updates from me may be by Thursday next week.


2 or 3 days of WestNW or even NW airflow in all parts are expected.


Often very windy with very heavy rain over NW and the North UK.


 


Originally Posted by: LA2B MeridFlowEuro09 


I would say there is actually more of a cool down coupled with drier days ( as you say )


http://www.wetterzentrale.de/pics/Rtavn14417.gif


http://www.wetterzentrale.de/pics/Rtavn16817.gif


http://www.wetterzentrale.de/pics/Rtavn19217.gif


http://www.wetterzentrale.de/pics/Rtavn21617.gif


http://www.wetterzentrale.de/pics/Rtavn24017.gif


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


with mild days less apparent


 


Remember anything after T120 is really Just For Fun



Marcus
Banbury
North Oxfordshire
378 feet A S L


Arcus
26 November 2015 17:43:38
GEM 12z apes the GFS 12z to some extent:
http://www.wetterzentrale.de/pics/Rgem2402.gif 

Ben,
Nr. Easingwold, North Yorkshire
30m asl
Whether Idle
26 November 2015 18:37:12


It does but what I say holds true, look at the next time there is a cold plunge forecasted ( if we're lucky ) and how far west the ECM backs this up, that is just one instance since it was updated. This was never an issue prior to the update.


Originally Posted by: Solar Cycles 


 ...will watch closely.  I will concede that I have often thought something similar...BUT... those verification stats suggest the ECM is still better, its possible that it is better(than the rest) , notwithstanding its perceived tendency to over do cold plunges.


Dover, 5m asl. Half a mile from the south coast.
bledur
26 November 2015 18:43:41

Staying predominately mild for the next fortnight , in the southern half of the country at least.


Slideshow image

LA2B MeridFlowEuro09
26 November 2015 18:53:26


 


Of course Marcus, Our Usual situation still prevails, we are set for the 2015 as being a true record breaker for being the warmest ever recorded.


I understand what you mean, I am sorry for emphasising the mild in my comments as I went on to explain about the Chilly cold NW Returning Maritime Polar spells.


 


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.

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