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Solar Cycles
12 December 2015 08:16:37


Looks like some disruption to the polar vortex long term:



Not a SSW event, but the cold temperatures have become more asymmetrical and one can envisage that this does become an SSW. Anyway its a small hope for a cold January. I mean we have had a frigid December and March in recent years; maybe this is the year we get a frigid January?


Yeh I'm not convinced either, but we can dream on.


Originally Posted by: Quantum 

At the moment we're only seeing any wave activity effecting the troposphere but with sign s of wave 1 activity continuing this will put increasing pressure of the stratosphere down the line. 

Gooner
12 December 2015 08:41:57


  16c or even 17c 


A very accurate summary


Here's a snapshot at 168 from ECM:



 


Originally Posted by: Whether Idle 


At midnight I doubt it


Remember anything after T120 is really Just For Fun



Marcus
Banbury
North Oxfordshire
378 feet A S L


doctormog
12 December 2015 08:47:48
Retron
12 December 2015 08:49:28


I've not seen the ECM ENS but am guessing the op run is off the scale for mildness again. Parts of the south keep + 850 temps throughout the next 10 days if correct. I'm not even sure whether that's happened before at this time of the year! 


Originally Posted by: Brian Gaze 


Here you go. Bear in mind at this time of year if we manage to get a ridge for any length of time it'll lead to colder conditions than the 850s will suggest! After the next few days the mild air does indeed look like returning with a vengeance as the break in the zonal flow we currently have collapses away SE'wards.


Last night's ECM control run again showed a typical zonal picture but not one of highs pegged in double figures for days on end.


NB, this is the mildest set of ECM ensembles I've seen for December; usually there are a few colder options but as with November they're now entirely absent. It'll be interesting to see the 15-day charts later!



 


Leysdown, north Kent
roger63
12 December 2015 09:14:01


 


Here you go. Bear in mind at this time of year if we manage to get a ridge for any length of time it'll lead to colder conditions than the 850s will suggest! After the next few days the mild air does indeed look like returning with a vengeance as the break in the zonal flow we currently have collapses away SE'wards.


Last night's ECM control run again showed a typical zonal picture but not one of highs pegged in double figures for days on end.


NB, this is the mildest set of ECM ensembles I've seen for December; usually there are a few colder options but as with November they're now entirely absent. It'll be interesting to see the 15-day charts later!



 


Originally Posted by: Retron 


Good analysis Retron.Posting the NAO observed and  forecast.Shows to date for December NAO around 1.5 but set to fallback in the forecast.Am I allowed to say that METO has written off December from a cold blocking point of view and in its contingency forecast talks of  an NAO + circulation persisting until at least until mid  Jan.















 


 
GFS North Atlantic Oscillation Outlooks
David M Porter
12 December 2015 09:37:57

For all the talk there has been about a possible record mild December, it would appear to me that if the operational model runs I'm looking at are right, the best chance of this will be over southern parts of England. From what I can see, the chances of this happening in Scotland look to me no more than 50:50 and the models do seem to be trying to send the jet a bit further south as we get nearer to Christmas.


Unless the models are proved wrong, I doubt that it will end up as a record mild December nationwide.


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
Nordic Snowman
12 December 2015 10:09:02

It's all about the MILD at the moment and that theme continues from the Norwegian Met too.



The above is for Xmas week.


In a nut shell, December will be a very mild month for much of N and W Europe. In fact, probably for much of the N Hemisphere winter zones. There is simply a lack of cold air. The skiing is suffering in the Alps and the outlook is bleak too.


Bjorli, Norway

Website 
moomin75
12 December 2015 12:57:52

Well that GFS 6z suggests a chance is still there to break the December daily temp record next Thursday. If we can get a bit of sun and Foehn effect it would be feasible to break 18.3C.
Longer term there is still no end in sight and to be honest it's quite exciting knowing that the December CET could be smashed to smithereens. It actually does make fascinating model watching.


Witney, Oxfordshire
100m ASL
Brian Gaze
12 December 2015 13:47:26


Good morning. Does anybody know what's happened to the 'UK precipitation type' option in GFS this morning? Instead of the normal blues & pinks, there are sort of white bubbles/ patches all over it. Is it a new presentation format?


 


Bertie


Originally Posted by: Bertwhistle 


Tweaked those again so you'll see a mottled pattern and white to pink shading indicating increasing intensity. Today's 6z run shows this.



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
Russwirral
12 December 2015 14:03:11
Ensembles are starting to look a bit interesting, with an overall consensus towards colder weather up to or around Xmas. This has been visible on the GFS op run - with what looks to be Cold maritime air running across the UK. We could end up with another boxing day '14 if that setup is around.... similar to todays snowy action.


Seasonal :)

Still alot of clutter though.

http://www.theweatheroutlook.com/charts/gefs/gefsens850liverpool0.png?cb=602 
lezrob
12 December 2015 14:14:55
Could be just media rubbish, but the last time we had a full moon on Xmas day was 1977. I believe what followed would be classed as a good January and February. Hey it's as good as squirrels and nuts...
Been lurking for 7 years... Still know nothing.. Weather fascinates..
Banbury Oxon
moomin75
12 December 2015 14:17:06

Ensembles are starting to look a bit interesting, with an overall consensus towards colder weather up to or around Xmas. This has been visible on the GFS op run - with what looks to be Cold maritime air running across the UK. We could end up with another boxing day '14 if that setup is around.... similar to todays snowy action.


Seasonal :)

Still alot of clutter though.

Originally Posted by: Russwirral 

">http://www.theweatheroutlook.com/charts/gefs/gefsens850liverpool0.png?cb=602


They are a bit more interesting Russ as they show at last a definite downward trend.


Still nothing particularly cold but perhaps more seasonal come Christmas. Whether it would by then be enough to prevent a record December is questionable but definitely a trend there. Although I note that is for your neck of the woods. Haven't seen the London ensemble is it similar??


Witney, Oxfordshire
100m ASL
nsrobins
12 December 2015 14:31:39

Could be just media rubbish, but the last time we had a full moon on Xmas day was 1977. I believe what followed would be classed as a good January and February. Hey it's as good as squirrels and nuts...

Originally Posted by: lezrob 


Its not just media rubbish. Apart from nanoscale influence on local conditions, the tides have no effect on weather whatsoever, and anyone who says otherwise is quite literally a lunatic. The phase of the moon is totally irrelevant.


Actually the squirrels are likely to know more about impending trends than the moon does 😎🌛


Neil
Fareham, Hampshire 28m ASL (near estuary)
Stormchaser, Member TORRO
David M Porter
12 December 2015 14:34:59


Well that GFS 6z suggests a chance is still there to break the December daily temp record next Thursday. If we can get a bit of sun and Foehn effect it would be feasible to break 18.3C.
Longer term there is still no end in sight and to be honest it's quite exciting knowing that the December CET could be smashed to smithereens. It actually does make fascinating model watching.


Originally Posted by: moomin75 


A question for you Moomin: Do you think that there is a chance of this December becoming the mildest on record in Scotland? Because from what I'm seeing in the model output just now, I'm a long way from being convinced about that.


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
lezrob
12 December 2015 14:39:14


 


Its not just media rubbish. Apart from nanoscale influence on local conditions, the tides have no effect on weather whatsoever, and anyone who says otherwise is quite literally a lunatic. The phase of the moon is totally irrelevant.


Actually the squirrels are likely to know more about impending trends than the moon does 😎🌛


 Ah well one less straw to clutch 😆

Originally Posted by: nsrobins 


Been lurking for 7 years... Still know nothing.. Weather fascinates..
Banbury Oxon
moomin75
12 December 2015 14:40:28


 


A question for you Moomin: Do you think that there is a chance of this December becoming the mildest on record in Scotland? Because from what I'm seeing in the model output just now, I'm a long way from being convinced about that.


Originally Posted by: David M Porter 

Absolutely not. I think England (CET) will be record breaking as does GW AND Gavin now.


It looks highly likely to me that Scotland will come out average or just below, but in terms of the CET it is looking almost certain (based on the models) that we will considerably smash the 8.1c record.


As GW says in the CET thread, it could even come out above 9c which would be absolutely extraordinary.


Witney, Oxfordshire
100m ASL
White Meadows
12 December 2015 14:59:51

Record breaking Cet December looks unlikely with ensembles showing a return to average for the final 3rd of the month.

moomin75
12 December 2015 15:03:10


Record breaking Cet December looks unlikely with ensembles showing a return to average for the final 3rd of the month.


Originally Posted by: White Meadows 

Above average CET is absolutely certain unless the final third of the month comes out well below, which it's not going to.


Record breaking CET is very possible if you check out GW's recent post in the relevant thread.


Witney, Oxfordshire
100m ASL
briggsy6
12 December 2015 16:15:31

Why do we only seem to get record breaking mild temperatures? I thought most scientists predictions about GW was that it would lead to  more extremes of both cold and mild?


Location: Uxbridge
Bertwhistle
12 December 2015 16:20:29


 


Tweaked those again so you'll see a mottled pattern and white to pink shading indicating increasing intensity. Today's 6z run shows this.



Originally Posted by: Brian Gaze 


Yes that looks really good, Brian; and because it looks a bit like snow it's rather pleasant to stare at for ages.


Bertie


Bertie, Itchen Valley.
Retire while you can still press the 'retire now' button.
Retron
12 December 2015 16:53:35
Looks like the Met Office now let us see MOGREPS output further into the future - their forecasts have this afternoon started going out to 7 days rather than just 5.
Leysdown, north Kent
Russwirral
12 December 2015 16:58:58
FI again going with a cold theme over Xmas. Main drivers for this is what appears to be a weakening (but not disapearance) of the Euro High - being replaced with a mid atlantic HP. Meaning LPs are arriving from the north west - as opposed to from spain and milder regions.

I can see a repeat of last xmas out of this.

Nice to see.
roger63
12 December 2015 17:12:42

FI again going with a cold theme over Xmas. Main drivers for this is what appears to be a weakening (but not disapearance) of the Euro High - being replaced with a mid atlantic HP. Meaning LPs are arriving from the north west - as opposed to from spain and milder regions.

I can see a repeat of last xmas out of this.

Nice to see.

Originally Posted by: Russwirral 


Yes FI has an interesting  48hrs -a Christmas  day toppler ridge  a surprise Scandi HP for boxing day but a one day wonder as Atlantic  flow pushes HP away SE on the 27th.Ensembles will give an idea of whether this is an isolated ENS.

roger63
12 December 2015 17:54:55


 


Yes FI has an interesting  48hrs -a Christmas  day toppler ridge  a surprise Scandi HP for boxing day but a one day wonder as Atlantic  flow pushes HP away SE on the 27th.Ensembles will give an idea of whether this is an isolated ENS.


Originally Posted by: roger63 


This looks like an outlier .80% of Christmas day  ENS are zonal,70% are mild.

Brian Gaze
12 December 2015 18:13:58

Xmas Day GEFS12z postage stamps. (Click through for full sized version)



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

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