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Russwirral
05 December 2020 16:55:52
another run and more push towards pressure rising to the south, horizontal isobars and yellow and green puddles over the UK

welcome to winter in the UK
Karl Guille
05 December 2020 17:21:13
GFS sticking to its guns with a milder interlude as we head towards next weekend as per the short ensembles. High pressure holding on across Europe though and never far away with the far north maintaining an easterly bias on several runs.
https://modeles16.meteociel.fr/modeles/gensp/runs/2020120512/graphe3_0000_310.94000244140625_131.4199981689453___.gif 

St. Sampson
Guernsey
picturesareme
05 December 2020 17:24:55


 


Well, I do recall a certain contributor from Shropshire saying the headlines this week would all be about flooding. I did suggest there might be the odd headline about a surprise snowfall.


Still a covering on the grass here but the last of the slush and snow has just cleared from the surrounding lanes.


Originally Posted by: Gandalf The White 


Do you mean flood headlines like these?


https://www.eadt.co.uk/news/flood-warnings-and-alerts-in-suffolk-1-6953293


https://www.theguardian.com/uk-news/2020/dec/05/heavy-rainfall-prompts-flood-warnings-and-travel-disruptions-in-uk


https://www.kentonline.co.uk/maidstone/news/photos-show-extent-of-flooding-as-roads-remain-shut-238736/


 

Retron
05 December 2020 17:43:53
Time for one of those regular reminders that we have full access to the ECM ensembles now, so it's worth checking those as well as GEFS.

Examples for Reading, but you can change the point by using the link below.

Medium range:
https://www.ecmwf.int/en/forecasts/charts/web/classical_meteogram?facets=undefined&time=2020120500,0,2020120500&epsgram=classical_10d&lat=51.57&lon=-0.83&station_name=Reading,%20United%20Kingdom 
(10 day)

https://www.ecmwf.int/en/forecasts/charts/web/classical_meteogram?facets=undefined&time=2020120500,0,2020120500&epsgram=classical_15d_with_climate&lat=51.57&lon=-0.83&station_name=Reading,%20United%20Kingdom 
(15 day)

Long range:
https://apps.ecmwf.int/webapps/opencharts/products/mofc_multi_eps_family_plumes?base_time=202012030000&city=Reading 
(32 day)

FWIW... they all show a milder / less cold spell in around a week's time. The long-range one then says colder weather will follow and there are some hints of that on the medium range output too... but it doesn't quite go out far enough.
Leysdown, north Kent
ballamar
05 December 2020 18:29:12
ECM has a more blocked looking 120 with the low much further under the block. Likely we will have some milder weather but not nailed on yet
marting
05 December 2020 18:32:37

Thanks for those links Darren. The models are certainly keeping us on our toes at the moment. ECM tonight seems to be sticking with the block, quite in contrast to others at 144. However half GFS runs keep blocking at the end, so could go either way.


Martin


Martin
Greasby, Wirral.
doctormog
05 December 2020 18:38:04


Thanks for those links Darren. The models are certainly keeping us on our toes at the moment. ECM tonight seems to be sticking with the block, quite in contrast to others at 144. However half GFS runs keep blocking at the end, so could go either way.


Martin


Originally Posted by: marting 


The ECM at 144hr is closer to the GEM and UKMO than the GFS for what it is worth. My conclusion from that is that there is no agreement and more runs are needed. It could become either quite mild or quite cold or may even be around average. 


marting
05 December 2020 18:39:54

Your right Doc, I was a little bit pessimistic on some of the other runs 👍😃


Martin
Greasby, Wirral.
Ally Pally Snowman
05 December 2020 19:01:24

ECM looks awfully close to a snow event in the 120 - 168h range. Ends v blocked. 


Bishop's Stortford 85m ASL.
Ally Pally Snowman
05 December 2020 19:12:30

GEM control with the chart of the century this evening 


 


 


https://www.meteociel.fr/modeles/cmc_cartes.php?code=0&ech=384&mode=0&carte=1


 


 


Bishop's Stortford 85m ASL.
Rob K
05 December 2020 19:19:14


GEM control with the chart of the century this evening 


 


 


https://www.meteociel.fr/modeles/cmc_cartes.php?code=0&ech=384&mode=0&carte=1


 


 


Originally Posted by: Ally Pally Snowman 


You know it’s bad when not only the cannon fodder models but not even the op run of the cannon fodder models get wheeled out :)


 


ECM probably the pick of a bad bunch but even that is just delaying the slide to a Euroslug. After a brief tease it’s looking like normal service resumes for December. 


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
Hippydave
05 December 2020 19:23:59

FI and all that but it's a shame HP bubbles up to the south of us on the ECM at T240 - would need the trough to our North to lift out or die off and the HP ridge to our West to combine with said HP to at least give a chance of surface cold, other than that I suspect it'd be dank and mild, gradually moving to wetter and mild. 


More interesting before that of course and prolongs the current chilly spell for longer than the GFS op (and mostly the GFS ens too). 


 


 


 


Home: Tunbridge Wells
Work: Tonbridge
Ally Pally Snowman
05 December 2020 19:24:27


 


You know it’s bad when not only the cannon fodder models but not even the op run of the cannon fodder models get wheeled out :)


 


ECM probably the pick of a bad bunch but even that is just delaying the slide to a Euroslug. After a brief tease it’s looking like normal service resumes for December. 


Originally Posted by: Rob K 


 


I'm actually quite optimistic there is a lot of HLB on the way sooner or later the charts will get more interesting. 


Bishop's Stortford 85m ASL.
nsrobins
05 December 2020 19:27:35


 


 


I'm actually quite optimistic there is a lot of HLB on the way sooner or later the charts will get more interesting. 


Originally Posted by: Ally Pally Snowman 


Well the ECM is actually a tonic after the GFS OP, with a west Atlantic ridge poised to link NE and get some proper HLB set up if the run could go past 240hrs.


Neil
Fareham, Hampshire 28m ASL (near estuary)
Stormchaser, Member TORRO
Polar Low
05 December 2020 19:51:14

Yes colder than it looks close up maybe-7 850 EA and S/E  @ T168 with short waves in the mix pleased with that run


 



ECM looks awfully close to a snow event in the 120 - 168h range. Ends v blocked. 


Originally Posted by: Ally Pally Snowman 

Saint Snow
05 December 2020 20:02:36


more runs are needed. 


Originally Posted by: doctormog 


 



 



Martin
Home: St Helens (26m asl) Work: Manchester (75m asl)
A TWO addict since 14/12/01
"How can wealth persuade poverty to use its political freedom to keep wealth in power? Here lies the whole art of Conservative politics."
Aneurin Bevan
Russwirral
05 December 2020 20:06:51

ECM gives a hint at what might be right at the end, as a new Cell of HP starts to locate to our east... to far south to of any real use... but with an active low over towards Turkey - its not far off being a good setup to drive cold air from deeper in the continent, than just from a cool central Europe.

However for the interim, things continue with the message... relatively unsettled, potential for a pulse of warm air if the high locates to our south mid month...

Cool enough to feel the season, but not cold enough to be useful for much frost of wintry stuff... Again the UK takes its place as being "marginal" for the foreseasble


Extreme Alde
05 December 2020 20:37:13
It seems uncertain at 120 yet the direction at 240 is still grabbing attention. It really appears that no model has a grip - and is all the more fascinating for it.
Russwirral
05 December 2020 20:48:54

It seems uncertain at 120 yet the direction at 240 is still grabbing attention. It really appears that no model has a grip - and is all the more fascinating for it.

Originally Posted by: Extreme Alde 


 


This is true.... but  most if not all are going for an evolution to either Mild, or cool.


 


Im not seeing many models going for cold air anywhere near Western Europe...


 


apart from that even last week where the GFS went for a GH, Ive not seen anything extreme in the models this winter yet


Karl Guille
05 December 2020 22:09:03
The Atlantic not quite so progressive on the 18z as a little more energy slips S/E over France.
http://modeles.meteociel.fr/modeles/gfs/runs/2020120518/gfs-0-120.png?18 

St. Sampson
Guernsey
RobN
  • RobN
  • Advanced Member
05 December 2020 22:37:07


 


The ECM at 144hr is closer to the GEM and UKMO than the GFS for what it is worth. My conclusion from that is that there is no agreement and more runs are needed. It could become either quite mild or quite cold or may even be around average. 


Originally Posted by: doctormog 


One policy change I would recommend to Biden would be to reduce the number of GFS runs to just twice a day.


Rob
In the flatlands of South Cambridgeshire 15m ASL.
doctormog
05 December 2020 22:49:05


 


One policy change I would recommend to Biden would be to reduce the number of GFS runs to just twice a day.


Originally Posted by: RobN 



picturesareme
05 December 2020 22:54:08

This winter does have a 2008/09 vibe to it at the moment - just lacking in the frost department so far.

DEW
  • DEW
  • Advanced Member
06 December 2020 07:30:58

The chart makers produce a different output daily if not more often - regard confidence as low!


GFS - current LP not filling as quickly as forecast with the secondary centre off NE Scotland reviving and deepening Tue 8th before being superseded by Atlantic trough 985mb NI Sat 12th . After that, more activity on the N Atlantic to midweek; then strong appearance by Azores high (new!) 1035mb Cornwall Fri 18th moving N and forming ridge from Greenland to UK to Balkans and branch to Iberia Tue 22nd. That looks like surface cooling with frost and fog for week 2.


GEFS - temps stay cool with good agreement between runs to Fri 11th after which much less agreement but mean of runs now a degree or two above norm to Tue 22nd, op & control leading the way. Some rain Fri 11th -Thu 17th esp in S, persisting in W, rather less wet elsewhere and other times. GFS hasn't told GEFS about its Azores high development.


ECM - like GFS for the next week but has by Wed 16th already brought the Azores high through and placed it as a centre over the Baltic with SE/E-lies beginning to develop


War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl

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