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Retron
22 December 2014 11:51:01


 


They're not to be taken literally of course especially with high divergence but they do show the balance of probability of a particular weather type, and as you said to be used in conjunction with the spreads and other data available.


Originally Posted by: Fothergill 


They'd only do that if there was an overwhelming cluster around one particular outcome and even then they'd be "tainted" by the other solutions.


Those ensemble mean charts are worthless at the moment.


Clusters are the way to go!


Leysdown, north Kent
roger63
22 December 2014 12:00:45

Post  next weekends depression at 240h New Years day wide diversity of options but grouping  together gives a 50:50 split Mild:Cold.

Jonesy
22 December 2014 12:00:51

FI in t174 but interesting the GFS Snow Accu across the South


Snow accu. GFS Mo 29.12.2014 12 GMT


http://www.weatheronline.co.uk/cgi-bin/expertcharts?LANG=en&MENU=0000000000&CONT=ukuk&MODELL=gfs&MODELLTYP=1&BASE=-&VAR=weas&HH=174&ZOOM=0&ARCHIV=0&RES=0&WMO=&PERIOD=


 


Then further into lala land a NE'ly


Wind 850 hPa GFS Tu 30.12.2014 00 GMT


http://www.weatheronline.co.uk/cgi-bin/expertcharts?LANG=en&MENU=0000000000&CONT=ukuk&MODELL=gfs&MODELLTYP=1&BASE=-&VAR=uv85&HH=186&ZOOM=0&ARCHIV=0&RES=0&WMO=&PERIOD=


Straw Clutching I know !! 


Medway Towns (Kent)
The Weather will do what it wants, when it wants, no matter what data is thrown at it !
Retron
22 December 2014 12:04:08

Talking of clusters, today's EPS has no fewer than 5 of them! Here's the 120 thumbnails:



Leysdown, north Kent
ITSY
22 December 2014 12:04:56


 


 


3 or 4 bitter Easterlies in the mix as well...    all to play for.


 


Added:  I'll take perturbation 1 please....     snow heaven 


Originally Posted by: kmoorman 


Now PTB 1 is what I play for! Awesome run through FI!


Back to reality and a couple of colder options showing, but an array of mild options also on the table. Interesting model watching, also given changes in the strat. Check out its position towards the end on the Op - very peculiar

Retron
22 December 2014 12:05:59

GEFS clusters are available here - far more useful than those overall mean charts.

http://www.weatheronline.co.uk/cgi-bin/expertcharts?LANG=en&MENU=0000000000&CONT=euro&MODELL=gefs&MODELLTYP=2&BASE=-&VAR=cpre&HH=204&ZOOM=0&ARCHIV=0&RES=0&WMO=&PERIOD=


Leysdown, north Kent
Rob K
22 December 2014 12:18:34
Matt Hugo on Twitter: "Dec update of the EUROSIP model supports the recent EC Seasonal update & signals greater amount of northern blocking through Jan/Feb/Mar"
Yateley, NE Hampshire, 73m asl
"But who wants to be foretold the weather? It is bad enough when it comes, without our having the misery of knowing about it beforehand." — Jerome K. Jerome
Maunder Minimum
22 December 2014 12:19:27


Indications of a strospheric warming now showing in the models


http://users.met.fu-berlin.de/~Aktuell/strat-www/wdiag/ts.php?plot=temps&alert=1&lng=eng


 


Originally Posted by: Roonie 


Most promising news for some time - these strat forecasts are usually rock solid, once they show up.


New world order coming.
kmoorman
22 December 2014 12:19:36

Matt Hugo on Twitter: "Dec update of the EUROSIP model supports the recent EC Seasonal update & signals greater amount of northern blocking through Jan/Feb/Mar"

Originally Posted by: Rob K 


More Jam Tomorrow.  


Home: Durrington, Worthing, West Sussex. (16 ASL)
Work: Canary Wharf, London
Follow me on Twitter @kmoorman1968
Quantum
22 December 2014 12:29:57

Models seem to be going for turnovers today. Like I say, it isn't over until the wind has a westerly component in it.


 


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.
RobN
  • RobN
  • Advanced Member
22 December 2014 12:58:20


GEFS clusters are available here - far more useful than those overall mean charts.

http://www.weatheronline.co.uk/cgi-bin/expertcharts?LANG=en&MENU=0000000000&CONT=euro&MODELL=gefs&MODELLTYP=2&BASE=-&VAR=cpre&HH=204&ZOOM=0&ARCHIV=0&RES=0&WMO=&PERIOD=


Originally Posted by: Retron 


Thanks for that link - I didn't realize this analysis was available 


Rob
In the flatlands of South Cambridgeshire 15m ASL.
QQQQ
  • QQQQ
  • Advanced Member
22 December 2014 13:15:32

Matt Hugo on Twitter: "Dec update of the EUROSIP model supports the recent EC Seasonal update & signals greater amount of northern blocking through Jan/Feb/Mar"

Originally Posted by: Rob K 


He forgot to add the year........ 2016


Cheers
"Q"
Poole, Dorset
39m ASL
Poole Current Conditions  
Gavin P
22 December 2014 13:17:07

Hi all,


Here's today's video update;


Reaching The Crunch On Post Christmas Cold



Still hard to call the weather after Boxing Day.


Rural West Northants 120m asl
Short, medium and long range weather forecast videos @ https://www.youtube.com/user/GavsWeatherVids
Rob K
22 December 2014 13:28:33


Models seem to be going for turnovers today. Like I say, it isn't over until the wind has a westerly component in it.


 


Originally Posted by: Quantum 


 


It's over! http://www.wetterzentrale.de/pics/Rtavn001.gif


Yateley, NE Hampshire, 73m asl
"But who wants to be foretold the weather? It is bad enough when it comes, without our having the misery of knowing about it beforehand." — Jerome K. Jerome
Quantum
22 December 2014 14:09:20

New type of chart tonight (hopefully the 12Z will continue the good trend of the 6Z - btw the parallel is pretty chilly isn't it!)


Here are ensemble 6Z snow risk maps anyway:


 


Midday xmas day - looks like a small chance of snow showers down the E coast.



Boxing day midday, looks like a very low risk of snow on the leading edge of the trough moving in for Scotland.



As the cold air finally truly digs in on the 27th the snow risk transfers to the NW, and is visible as a fairly widespread low-moderate risk.



It would seem that the ensembles favour a NWerly flow by the 28th, however this is clearly arctic air and the distribution of snow showers reflects that. 


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.
roger63
22 December 2014 15:37:52

Matt Hugo on Twitter: "Dec update of the EUROSIP model supports the recent EC Seasonal update & signals greater amount of northern blocking through Jan/Feb/Mar"

Originally Posted by: Rob K 


I would take some notice of that- support for a shift to NAO -ve conditions (on average)

nsrobins
22 December 2014 16:27:07

It seems normal service is resumed for both GFS variants on the 12Z run, although based on the last week or so who knows what 'normal' is?
It is perfectly possible that these runs are on the edge of the milder cluster so best wait for the ENS to stream out.


Neil
Fareham, Hampshire 28m ASL (near estuary)
Stormchaser, Member TORRO
kmoorman
22 December 2014 16:28:45


It seems normal service is resumed for both GFS variants on the 12Z run, although based on the last week or so who knows what 'normal' is?
It is perfectly possible that these runs are on the edge of the milder cluster so best wait for the ENS to stream out.


Originally Posted by: nsrobins 


 


We'll know in a while.  Frustrating isn't it?


Home: Durrington, Worthing, West Sussex. (16 ASL)
Work: Canary Wharf, London
Follow me on Twitter @kmoorman1968
JACKO4EVER
22 December 2014 16:31:29
ENS will be interesting, but hopefully GFS has finally picked up a milder solution to run with. It wouldn't surprise me to see this sitting amongst a fairly generous cluster of milder options. Let's see...
SEMerc
22 December 2014 16:35:57

God this thread is becoming so predictable. I can tell - even before coming in here - how crap the operational is, because of who's posted.

doctormog
22 December 2014 16:37:01

ENS will be interesting, but hopefully GFS has finally picked up a milder solution to run with. It wouldn't surprise me to see this sitting amongst a fairly generous cluster of milder options. Let's see...

Originally Posted by: JACKO4EVER 


I can't wait to see the ensemble data if this is one of the milder solutions 


http://www.wetterzentrale.de/pics/Rtavn1321.html


It may not be long-lasting but mild it is not. Seasonal at very worst. Anyway the big inter-run changes simply highlight the uncertainty.


Whether Idle
22 December 2014 16:39:06

Met O at 120.  Stormy, or to put it another way, Bullseye!


Modele UKMO - Carte prévisions


Dover, 5m asl. Half a mile from the south coast.
Quantum
22 December 2014 16:40:45

The GFS and GFSP are poor but the UKMO is the best it has been in a while. However if the ECM supports the GFS this would be the first time two major models have both gone for mild on the same run.


 


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.
JACKO4EVER
22 December 2014 16:42:22


 


I can't wait to see the ensemble data if this is one of the milder solutions 


http://www.wetterzentrale.de/pics/Rtavn1321.html


It may not be long-lasting but mild it is not. Seasonal at very worst. Anyway the big inter-run changes simply highlight the uncertainty.


Originally Posted by: doctormog 


well a nationwide freeze it certainly isn't. If it's windy, cold rain your after for a couple of days then fine,  but a return to a flatter pattern looks almost certain to me, which looks to be a milder solution. Despite NW winds this month, isn't the CET currently slightly above the December average?

nsrobins
22 December 2014 16:50:01


 


well a nationwide freeze it certainly isn't. If it's windy, cold rain your after for a couple of days then fine,  but a return to a flatter pattern looks almost certain to me, which looks to be a milder solution. Despite NW winds this month, isn't the CET currently slightly above the December average?


Originally Posted by: JACKO4EVER 


There's a fine line between impartial observation and subtle provocation, and you walk it very well Jason


'Hopefully' for the majority in this thread the MetO will build on a more southerly exit for the low and raise heights behind as per the 06Z GFS OPs and show the GFS 12Z to be one of the more inaccurate variations on the theme.


Neil
Fareham, Hampshire 28m ASL (near estuary)
Stormchaser, Member TORRO

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