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ballamar
18 December 2022 19:14:42

This is what the snow risk probability data from the GFS 12z suite say for Christmas Day:

https://modeles16.meteociel.fr/modeles/gensp/run/gensprobuk-26-180.png?12

UserPostedImage 

Originally Posted by: doctormog 



exactly this - to call it now is wrong. I would be happier the further north I was of the chances !
moomin75
18 December 2022 19:21:55

exactly this - to call it now is wrong. I would be happier the further north I was of the chances !

Originally Posted by: ballamar 

Based on what looks to be a highly erroneous GFS.​​​​​​​The other main models are not remotely interested in what GFS is showing, and the forecasts back this up.​​​​​​​There is no dressing it up, what lies ahead looks pretty dire for most (away from jolly old Scotland).   
Witney, Oxfordshire
100m ASL
Joe Bloggs
18 December 2022 19:25:51
What a horrible ECM det run. 

The 12z EPS will be interesting. 

Manchester City Centre, 31m ASL

doctormog
18 December 2022 19:26:39

What a horrible ECM det run. 

The 12z EPS will be interesting. 

Originally Posted by: Joe Bloggs 



I think the word you are looking for is “erroneous” Joe.  🤡
Joe Bloggs
18 December 2022 19:29:20

I think the word you are looking for is “erroneous” Joe.  🤡

Originally Posted by: doctormog 



Or faulty! 😂😂😂

It does seem a tad out of kilter. 

Or it could be spot on and the GEFS could be going off on one. We’ll have a better idea this time tomorrow. 

Manchester City Centre, 31m ASL

DEW
  • DEW
  • Advanced Member
18 December 2022 19:31:13

Based on what looks to be a highly erroneous GFS.The other main models are not remotely interested in what GFS is showing, and the forecasts back this up.​​​​​​​There is no dressing it up, what lies ahead looks pretty dire for most (away from jolly old Scotland).   

Originally Posted by: moomin75 



Here's a suggestion that cold air and snow could reach the Channel Coast on Tue 27th mid-day - for one day only!
https://www.netweather.tv/charts-and-data/snow-risk 
War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl
RobN
  • RobN
  • Advanced Member
18 December 2022 19:36:44

What a horrible ECM det run. 

Originally Posted by: Joe Bloggs 


A welcome relief for Ukraine though. Every cloud and all that.
Rob
In the flatlands of South Cambridgeshire 15m ASL.
Zubzero
18 December 2022 19:36:45

Or faulty! 😂😂😂

It does seem a tad out of kilter. 

Or it could be spot on and the GEFS could be going off on one. We’ll have a better idea this time tomorrow. 

Originally Posted by: Joe Bloggs 



Missing data because of Christmas?? 😋

best be careful I don't set Retron off over the missing Xmas data 😂

 
Joe Bloggs
18 December 2022 19:38:16
12z MOGREPS

No clarity here I’m afraid. Some chilly runs nonetheless. UserPostedImage

the snow depth postage stamps for midnight Boxing Day aren’t very exciting for most parts @Brian Gaze - any idea how accurate these are? 

UserPostedImage

max temp postage stamps also for reference 

UserPostedImage

 

Manchester City Centre, 31m ASL

ballamar
18 December 2022 19:44:24

Based on what looks to be a highly erroneous GFS.The other main models are not remotely interested in what GFS is showing, and the forecasts back this up.​​​​​​​There is no dressing it up, what lies ahead looks pretty dire for most (away from jolly old Scotland).   

Originally Posted by: moomin75 


​​​​​​​which data points were wrong on GFS for it to be highly erroneous? Honestly it might be wrong but to say it’s erroneous is plain stupid
Chunky Pea
18 December 2022 19:47:55

I would think that the UKMO is closest to getting this right.
Why?
Because all forecasts I've seen upto Christmas have said mild. You only need to look at the BBC weather website to see how mild it is going to be.
I think, therefore, GFS and ICON have gone off on one.  I fully expect ECM to follow UKMO today.

Originally Posted by: moomin75 

Even if it correct, the level of cold that is building over N. Europe, the Arctic and N. America so early in the winter is interesting to watch. I honestly doubt we will escape this winter without getting another blast or two of brass monkeys. 
Current Conditions
https://t.ly/MEYqg 


"You don't have to know anything to have an opinion"
--Roger P, 12/Oct/2022
DEW
  • DEW
  • Advanced Member
18 December 2022 19:49:26

Based on what looks to be a highly erroneous GFS.The other main models are not remotely interested in what GFS is showing, and the forecasts back this up.There is no dressing it up, what lies ahead looks pretty dire for most (away from jolly old Scotland).   

Originally Posted by: moomin75 



Here's a suggestion that cold air and snow could reach the Channel Coast on Tue 27th mid-day - for one day only!
https://www.netweather.tv/charts-and-data/snow-risk 
War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl
Joe Bloggs
18 December 2022 19:53:38
I think the 12z EPS are slightly less cold than this morning. But yet again we have a det run that is completely out of kilter with the ensemble runs, most notably on Christmas Day itself. This has happened a lot very recently. 

UserPostedImage

Manchester City Centre, 31m ASL

The Beast from the East
18 December 2022 20:31:56

I think the 12z EPS are slightly less cold than this morning. But yet again we have a det run that is completely out of kilter with the ensemble runs, most notably on Christmas Day itself. This has happened a lot very recently. 

UserPostedImage

Originally Posted by: Joe Bloggs 


the high res op is picking this spoilier low and the ens are not at this stage. GEM has now gone pete tong as well
Only GFS left and that will also go later this evening.
Its time to give up on this one, could well end up a winter of one cold spell and then back to normal very wet and mild pattern. but at least we got to see lying snow in southern england again, which I was concerned may never happen again due to warming
 
"We have some alternative facts for you"
Kelly-Ann Conway - special adviser to the President
TomC
  • TomC
  • Advanced Member
18 December 2022 20:44:01
It is hard to bet against ecm operational run it does have the best verification stats with ukmo second
Joe Bloggs
18 December 2022 20:54:04

the high res op is picking this spoilier low and the ens are not at this stage. GEM has now gone pete tong as well
Only GFS left and that will also go later this evening.
Its time to give up on this one, could well end up a winter of one cold spell and then back to normal very wet and mild pattern. but at least we got to see lying snow in southern england again, which I was concerned may never happen again due to warming
 

Originally Posted by: The Beast from the East 



You could well end up being correct but things are often more volatile than that. 

e.g. ECM and MetO run could revert to cold to support GFS only for them all to revert back to mild just before the big day 😂. 

Interesting point about ECM op Tom also , although it is consistently out of step with its ensemble set which seems unusual. 

Manchester City Centre, 31m ASL

Taylor1740
18 December 2022 21:02:43

Based on what looks to be a highly erroneous GFS.The other main models are not remotely interested in what GFS is showing, and the forecasts back this up.​​​​​​​There is no dressing it up, what lies ahead looks pretty dire for most (away from jolly old Scotland).   

Originally Posted by: moomin75 


​​​​​​​that's a shame as I looked at the GEFS 12z and it looked like there was very solid support now for a decent cold snap, but if none of the other models are backing this up you would have to say the chance of cold again is next to nil now.
NW Leeds - 150m amsl
TPentlow
18 December 2022 21:26:28
I think the IconG has gone down the same route as the GFS and I am sure it was that model that never went for last years failed cold Christmas, so with any luck it has got it right this year!
________________________________________________
Tom (North Northants - 130m asl)
18 December 2022 21:28:16

that's a shame as I looked at the GEFS 12z and it looked like there was very solid support now for a decent cold snap, but if none of the other models are backing this up you would have to say the chance of cold again is next to nil now.

Originally Posted by: Taylor1740 



​​​​​​​No, I’m pretty sure that one day it will be cold again 😀
East Lothian. 100m ASL
dagspot
18 December 2022 21:52:37

No, I’m pretty sure that one day it will be cold again 😀

Originally Posted by: Lothian Snowman 


​​​​​​​2 hrs ago it was going to be cold again!  🤣
Neilston 600ft ASL
dagspot
18 December 2022 21:58:45
Stav suggesting may ‘just be cold enough for some snow over Christmas period’  usual uncertainty, north/south divide caveats
Neilston 600ft ASL
Brian Gaze
18 December 2022 22:01:51

12z MOGREPS

No clarity here I’m afraid. Some chilly runs nonetheless. UserPostedImage

the snow depth postage stamps for midnight Boxing Day aren’t very exciting for most parts @Brian Gaze - any idea how accurate these are? 

UserPostedImage

max temp postage stamps also for reference 

UserPostedImage

 

Originally Posted by: Joe Bloggs 



I don't have any verification stats for the Met Office data other than what is already publicly available on the NCEP website. It's probably worth remembering that those plots are generated using data from MOGREPS-G which is the global ensemble. There's also the local 2km version of MOGREPS which I have access to but don't offer on TWO currently.

 
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
Brian Gaze
18 December 2022 22:20:40
GFS 18z going for a big Xmas day snow event. However, after seeing the ECM ENS I'm less confident about the GFS / GEFS this evening.


UserPostedImage
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
squish
18 December 2022 22:25:20
Perhaps more notable on the 12z GEFS was the number going for a big and intense mid latitude high near the UK around 10 days.....

18z has this but also a cold period before
D.E.W on Dartmoor. 300m asl
NickR
18 December 2022 22:39:13
Hell of a run for the far north of England from Friday onwards this.

Very low temps 26/27 of Dec with substantial snow covering.
Nick
Durham
[email protected]

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