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Rob K
26 November 2017 17:28:36
Northerly airstreams still seem to be able to deliver to Greece, even as far south as Crete, so claiming they are too weak to affect the UK is frankly nonsense.

The problem with the current setup, as others have said, is that the cold is on the wrong side of the Arctic at the moment.
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Whether Idle
26 November 2017 17:31:57

Northerly airstreams still seem to be able to deliver to Greece, even as far south as Crete, so claiming they are too weak to affect the UK is frankly nonsense.

The problem with the current setup, as others have said, is that the cold is on the wrong side of the Arctic at the moment.

Originally Posted by: Rob K 


It is not nonsense.  It is a valid point.  Spend a bit more time presenting your evidence rather than a blanket dismissal which smacks of laziness.


Dover, 5m asl. Half a mile from the south coast.
Gusty
26 November 2017 17:34:40

Northerly airstreams still seem to be able to deliver to Greece, even as far south as Crete, so claiming they are too weak to affect the UK is frankly nonsense.

The problem with the current setup, as others have said, is that the cold is on the wrong side of the Arctic at the moment.

Originally Posted by: Rob K 


Northerlies deliver in winter to places like Greece Rob is due to the fact that there is no maritime modification of the airmass in its journey south. The UK is scuppered as our source is via the ocean. The source is less cold by a reduced polar ice cap and modified by corresponding higher SST's compared with yesteryear 


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Gooner
26 November 2017 17:36:30


 


I'm not "presuming it's correct", im just discussing what it shows. There's no route back to a northerly from those charts. It's no more or less likely than the GFS, I'm just discussing the range of outputs, which is the point of this thread! I'm not sure why that is "negative"?


Originally Posted by: Rob K 


Then why is it a shame GFS was so lovely .....that would imply you think UKMO is correct ....poor choice of words I’d say 


 


To add to the above the latest update from the Met suggest a return to a Northerly .....a continuation of the cold theme


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Retron
26 November 2017 17:42:14

Looks like the 12z GEFS has lurched downwards in terms of temperature. Compared to the 6z, it's noticably colder in low-res...


Here's the TWO chart. The Meteociel version isn't anywhere near as cold (the control run doesn't have ice days, for example), but the same general theme applies - it's colder than the 6z.



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NickR
26 November 2017 17:50:36
Can I just point out that my mother-in-law is over in the UK for the winter for the first time since December 2010... She arrived on Friday. Just as the temperature plummeted.

TWO cold and snow lovers might like to know she is due to be here all winter. πŸ˜‰
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Sevendust
26 November 2017 17:51:57
Darren is quite correct and Steve(Gusty) beat me to it on the Greece question.
Looks a pretty cold outlook to me, albeit no 2010.
Brian Gaze
26 November 2017 18:04:29


 


This is not the first time I have seen someone question the accuracy of the UKMO 144hr charts. I'd be interested to know how these charts compare for accuracy against the 144hr charts on the GFS and ECM op runs.


Originally Posted by: David M Porter 


There have been unsubstantiated rumours and conjecture over the years the even "insiders" don't rate the UM 144. Nonetheless I've never seen evidence for this and the stats show it is consistently close to the European and ahead of GFS/CMC for most of the time.



http://www.emc.ncep.noaa.gov/gmb/STATS_vsdb/allmodel/daily/cor/cor_day6_HGT_P500_G2NHX.png


 


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tallyho_83
26 November 2017 18:06:44

Darren is quite correct and Steve(Gusty) beat me to it on the Greece question.
Looks a pretty cold outlook to me, albeit no 2010.

Originally Posted by: Sevendust 


 


Similar to Nov 2008? end of NOV 2009 was similar too!


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Nordic Snowman
26 November 2017 18:09:57


Looks like the 12z GEFS has lurched downwards in terms of temperature. Compared to the 6z, it's noticably colder in low-res...


Here's the TWO chart. The Meteociel version isn't anywhere near as cold (the control run doesn't have ice days, for example), but the same general theme applies - it's colder than the 6z.



Originally Posted by: Retron 


Thanks for that Darren.


Yes, the GEFS paints a rather cold picture throughout. Interesting to note that the diurnal range is pretty low which tells me that there could be an E'ly influence in the SE corner with some murk and some wintry flurries. Another possibility is similar as to what may happen next weekend with fronts moving down from over the High from the N and bringing some wintry flurries as it mixes with the colder surface air.


Slowly but surely is the way at the moment and IMO, much better than just a quick/short snap of an arctic blast in-between Lows from a mobile set up.


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NickR
26 November 2017 18:10:25


 


There have been unsubstantiated rumours and conjecture over the years the even "insiders" don't rate the UM 144. Nonetheless I've never seen evidence for this and the stats show it is consistently close to the European and ahead of GFS/CMC for most of the time.



http://www.emc.ncep.noaa.gov/gmb/STATS_vsdb/allmodel/daily/cor/cor_day6_HGT_P500_G2NHX.png


 


Originally Posted by: Brian Gaze 


Startling how far back the GFS is. Is CMC the GEM?


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doctormog
26 November 2017 18:10:37
A nice ECM 12z so far...but it is only up to 72hr!

http://www.wetterzentrale.de/maps/ECMOPEU12_72_1.png  That’s a lot of cold way up north.
Brian Gaze
26 November 2017 18:11:59


 


Startling how far back the GFS is. Is CMC the GEM?


Originally Posted by: NickR 


Yes, CMC = Canadian Meteorological Centre  which runs GEM.


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some faraway beach
26 November 2017 18:18:15

 



 


There have been unsubstantiated rumours and conjecture over the years the even "insiders" don't rate the UM 144. Nonetheless I've never seen evidence for this and the stats show it is consistently close to the European and ahead of GFS/CMC for most of the time.


 


http://www.emc.ncep.noaa.gov/gmb/STATS_vsdb/allmodel/daily/cor/cor_day6_HGT_P500_G2NHX.png


 


Originally Posted by: Brian Gaze 


I think it might be down to the fact that people inevitably jump to the last frame of a particular model run, which is invariably going to be the least accurate. When the GFS 384hr charts  and ECM 240 hr charts shift, change and fail to verify, people excuse them on account of being too far out. But fewer people look as hard at the ECM and GFS 144 hr charts as they do the Met Office ones, so they don't notice that the UKMO is no better or worse than the other two for verifying at 144 hrs.


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doctormog
26 November 2017 18:26:47
And on that theme...ish. The ECM 12z is more similiar to the GFS op run than the UKMO model by day 5

http://www.wetterzentrale.de/maps/ECMOPEU12_120_1.png 

Whether the next stages look as wintry remains to be seen at time of writing.
tierradelfuego
26 November 2017 18:28:20

Can I just point out that my mother-in-law is over in the UK for the winter for the first time since December 2010... She arrived on Friday. Just as the temperature plummeted.

TWO cold and snow lovers might like to know she is due to be here all winter. ;)

Originally Posted by: NickR 


 


Funnily enough, and as much as it may be serious conjecture, my mother in law arrives from Australia next Sunday for the first winter visit since 2009. It is often said winters here follow the Australian winter in terms of European snow, and it was the best ski season down under in years last winter.


Still good signs of the GFS from later this week, according to the latest charts and ens.


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Shropshire
26 November 2017 18:37:19

And on that theme...ish. The ECM 12z is more similiar to the GFS op run than the UKMO model by day 5

http://www.wetterzentrale.de/maps/ECMOPEU12_120_1.png

Whether the next stages look as wintry remains to be seen at time of writing.

Originally Posted by: doctormog 


 


Yes looking good for a reload from the North on the ECM.


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ballamar
26 November 2017 18:45:27


 


 


Yes looking good for a reload from the North on the ECM.


Originally Posted by: Shropshire 


no need to look when you are positive πŸ˜€

Gandalf The White
26 November 2017 18:45:49

ECM at T+192


http://www.meteociel.fr/modeles/ecmwf/runs/2017112612/ECH1-192.GIF?26-0


Northerly on the way but the high pressure hasn't retrogressed quite so far at this point.


 


Edit: 850s show the warm sector moving south


 


 http://www.meteociel.fr/modeles/ecmwf/runs/2017112612/ECH0-192.GIF?26-0


 


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doctormog
26 November 2017 18:51:44
Considering the timescale there is very good agreement between the ECM and GFS for what it is worth.
Caz
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26 November 2017 18:54:04

Can I just point out that my mother-in-law is over in the UK for the winter for the first time since December 2010... She arrived on Friday. Just as the temperature plummeted.

TWO cold and snow lovers might like to know she is due to be here all winter. ;)

Originally Posted by: NickR 

 I’ll get the snow shovel out and the larder stocked in that case. 


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Gandalf The White
26 November 2017 18:57:58


SLP/500hPa:  http://www.meteociel.fr/modeles/ecmwf/runs/2017112612/ECH1-240.GIF?26-0


 


850s: http://www.meteociel.fr/modeles/ecmwf/runs/2017112612/ECH0-240.GIF?26-0


 


Wow....


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doctormog
26 November 2017 19:02:55


 I’ll get the snow shovel out and the larder stocked in that case. 


Originally Posted by: Caz 


I think mine has rusted through lack of use...and it’s plastic 


Whether Idle
26 November 2017 19:04:58


Well, I will be happy if some of that Cold deep air over Greenland makes it all the way down to the south coast with upper air temperatures of sub -10c, on about day 12.  Gandalf - your in box is full!


Dover, 5m asl. Half a mile from the south coast.
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