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JACKO4EVER
29 November 2019 18:16:29

so much for a mild zonal December that some posters were adamant was happening on all weather forums.

Gone a bit quiet all of a sudden haven’t they 😀

Originally Posted by: Argyle77 


well to be fair it might be best to comment at the end of December, not the end of November 😂😂


still, encouraging signs nonetheless of something drier and more seasonal in the first week 👍

Caz
  • Caz
  • Advanced Member
29 November 2019 18:52:49


 


well to be fair it might be best to comment at the end of December, not the end of November 😂😂


still, encouraging signs nonetheless of something drier and more seasonal in the first week 👍


Originally Posted by: JACKO4EVER 

  And it could all change on the next run!  Best not to get too smug until after the event but people can’t blamed for commenting on what they see in the models.  


Market Warsop, North Nottinghamshire.
Join the fun and banter of the monthly CET competition.
Gandalf The White
29 November 2019 19:14:48


 


Are you referring to the usual British Winter there?


Originally Posted by: Whether Idle 


I think he’s referring to most months of the year.


Location: South Cambridgeshire
130 metres ASL
52.0N 0.1E


Gandalf The White
29 November 2019 19:18:38
Interesting that ECM ends looking not unlike GFS with a split polar vortex and modest upper heights between and a mid-Atlantic ridge with some WAA.
Location: South Cambridgeshire
130 metres ASL
52.0N 0.1E


ballamar
29 November 2019 19:55:58

Interesting that ECM ends looking not unlike GFS with a split polar vortex and modest upper heights between and a mid-Atlantic ridge with some WAA.

Originally Posted by: Gandalf The White 


trending is good, think we could be looking at rapid inflation coming in the models in next few runs and changing media 

White Meadows
29 November 2019 22:17:21


 


trending is good, think we could be looking at rapid inflation coming in the models in next few runs and changing media 


Originally Posted by: ballamar 

...reminds me of a song by Public Enemy 

Ally Pally Snowman
29 November 2019 23:55:22

Something definitely brewing could be a snowy election day. Snow rows upto 25!


 


 



 


 


 


 


 


 


 


Bishop's Stortford 85m ASL.
DEW
  • DEW
  • Advanced Member
30 November 2019 06:59:20

Week 1 on GFS appears nailed on, well-defined Hp over the UK at the start of the week, declined to a spell of westerlies by the end of it. Then a rather odd-lookng spell IMO as the westerlies break up to leave week 2 with slack LP centres drifting across UK with a generally northerly and cold source of air. Snowfall somewhere, sometime, likely, but no really deep freeze. Brief blast from the south at the weekend 14/15th and then back to the previous pattern. ECM similar to start with, but in week 2 has a better defined trough stretching down from Scandi and HP mid Atlantic, rather than a generalised LP  still cold, though


Jetstream matches the above GFS, becoming weaker and not reaching the UK in week 2 before diving well S


GEFS as above post shows, cold to 3rd, mild to 7th, and dry; then somewhat unsettled and nearly all runs below average temp. Ominously, even Brighton has a snow row figure of 4 for election day (Plymouth 2, Liverpool 4, Aberdeen 9)


 


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

Chichester 12m asl
Heavy Weather 2013
30 November 2019 07:20:31
GFS looks good this morning. So lovely to see the potential for cold and seasonal weather during the period we would most love it.
Mark
Beckton, E London
Less than 500m from the end of London City Airport runway.
marting
30 November 2019 08:26:41

The ECM ensembles starting to show a marked slide away from days 10 onwards with some much colder runs appearing.


https://weather.us/forecast/11281273-greasby/ensemble/euro


Let’s see if the trend continues


martin


Martin
Greasby, Wirral.
Shropshire
30 November 2019 08:47:33


The ECM ensembles starting to show a marked slide away from days 10 onwards with some much colder runs appearing.


https://weather.us/forecast/11281273-greasby/ensemble/euro


Let’s see if the trend continues


martin


Originally Posted by: marting 


The synoptics being shown at this range are the sort that often change markedly nearer the time - the Azores High ends up closer, the jet ends up further North.


 


From December 27th 2020, zonality will be banned from mixing with the UK. We appreciate that this may come as a shock to younger people and old Uncle Barty. This ban will last for a minimum of ten days.
nsrobins
30 November 2019 09:25:26


 


The synoptics being shown at this range are the sort that often change markedly nearer the time - the Azores High ends up closer, the jet ends up further North.


 


Originally Posted by: Shropshire 


The TWO forum equivalent of automated output.


It could of course go the other way with the Az high pulling away and the jet tracking even further south than it already has, but I wouldn’t expect you to suggest that.


Neil
Fareham, Hampshire 28m ASL (near estuary)
Stormchaser, Member TORRO
doctormog
30 November 2019 09:44:48


 


The TWO forum equivalent of automated output.


It could of course go the other way with the Az high pulling away and the jet tracking even further south than it already has, but I wouldn’t expect you to suggest that.


Originally Posted by: nsrobins 



Spot on Neil. As Ian suggests uncertainty at that range will be high and confidence low. Things may turn out to be milder or colder than currently shown but the current trend is for a colder scenario. Gone is the mild-looking polling day, will it come back?


Shropshire
30 November 2019 09:48:47


 


The TWO forum equivalent of automated output.


It could of course go the other way with the Az high pulling away and the jet tracking even further south than it already has, but I wouldn’t expect you to suggest that.


Originally Posted by: nsrobins 


It's just experience in the modern era tells us that that's the way it is likely to go.


 


 


From December 27th 2020, zonality will be banned from mixing with the UK. We appreciate that this may come as a shock to younger people and old Uncle Barty. This ban will last for a minimum of ten days.
Heavy Weather 2013
30 November 2019 09:50:06


 


It's just experience in the modern era tells us that that's the way it is likely to go.


 


 


Originally Posted by: Shropshire 


The Models don’t have the modern era programmed into them. 


 


Mark
Beckton, E London
Less than 500m from the end of London City Airport runway.
doctormog
30 November 2019 09:50:46


 


It's just experience in the modern era tells us that that's the way it is likely to go.


 


 


Originally Posted by: Shropshire 


If it was that simple the models and forecast would factor that in. Unless of course your expertise trumps that of the professionals.


Steve Murr
30 November 2019 09:51:23
@Doc

Seen the output 150-180 could be very good for Northern Scotland - Unstable strong NW winds
DPower
30 November 2019 10:13:50
stratosphere profiles looking better and better with each passing day. Second half of December could be something special but allowing the imagination to wander can often lead to disappointment. Still very encouraged by what the strat charts are showing. Models are trying to sniff out height rises to our north in the mid to long range, although my feeling post mid month before we see strong blocking to the north and a big pattern change to much colder weather.
In the mean time transient colder snaps are very possible as the transition unfolds.
doctormog
30 November 2019 10:17:35

@Doc

Seen the output 150-180 could be very good for Northern Scotland - Unstable strong NW winds

Originally Posted by: Steve Murr 


Yes, higher parts of NW Scotland could do well out of the scenario shown (and bright and breezy here thanks to the mountains). 


Gandalf The White
30 November 2019 11:18:28
Still essentially cold zonality on offer from later next week after the initial transition to a mobile pattern. Few mild days on offer with generally incursions of cold air interspersed with something around average. As Steve has said, good for higher ground in Scotland, and for the higher parts of northern England, Wales and Ireland at times.
Location: South Cambridgeshire
130 metres ASL
52.0N 0.1E


White Meadows
30 November 2019 12:00:07
This

https://www.wetterzentrale.de/maps/ECMOPEU12_240_1.png 

Could path the way to something of interest later.

A certain warm up after Thursday before what seems to be a solidifying consensus for another cool down mid month:

http://www.weersite.net/?actueel&ensemble&ecmwfpluim 

Gandalf The White
30 November 2019 12:41:54

The ECM 00z ensembles for London confirm a brief 2-3 day return to average to mild conditions late next week and then a steady decline to rather cold and changeable conditions beyond next weekend.



 



Location: South Cambridgeshire
130 metres ASL
52.0N 0.1E


ballamar
30 November 2019 13:37:45
The ensembles look great, for December various snowfall chances would have expected it to be busier. We have a Breyer chance than most years of a decent cold spell
Retron
30 November 2019 13:53:36

The ensembles look great, for December various snowfall chances would have expected it to be busier. We have a Breyer chance than most years of a decent cold spell

Originally Posted by: ballamar 


There are lots of reasons.


Fewer people viewing the forum compared to years gone by.


"Seen it all before" syndrome.


From the actual data - again, why does nobody use the full ECM:


https://weather.us/forecast/2643743-london/ensemble/euro/snow


Next to no chance of any meaningful snow - sleet would, of course, be a bit more likely.


And the GEFS over the past few days has shown the typical scenario - a 3½-day sub -5C 850 spell (shown for several successive runs) has turned into around 12 hours down here and, as usual, it happened in the last 24-36 hours.


Get a decent cluster of -10s at 850 (not a single member gets there in the 0z EPS for London, FWIW), get a 50th percentile showing meaningful snow and I'll get excited. Until then - meh. At least it's not looking awfully zonal and mild, that's something!


Leysdown, north Kent
Gandalf The White
30 November 2019 14:29:19


 


There are lots of reasons.


Fewer people viewing the forum compared to years gone by.


"Seen it all before" syndrome.


From the actual data - again, why does nobody use the full ECM:


https://weather.us/forecast/2643743-london/ensemble/euro/snow


Next to no chance of any meaningful snow - sleet would, of course, be a bit more likely.


And the GEFS over the past few days has shown the typical scenario - a 3½-day sub -5C 850 spell (shown for several successive runs) has turned into around 12 hours down here and, as usual, it happened in the last 24-36 hours.


Get a decent cluster of -10s at 850 (not a single member gets there in the 0z EPS for London, FWIW), get a 50th percentile showing meaningful snow and I'll get excited. Until then - meh. At least it's not looking awfully zonal and mild, that's something!


Originally Posted by: Retron 


Hi Darren


As you know, I said cold zonality and that seldom delivers anything wintry for lowland southern Britain.  The point is, as you say, it’s preferable to mild zonality - and it does make it easier to transition to something colder. With a south-westerly flow or Bartlett you need a complete pattern shift.


Location: South Cambridgeshire
130 metres ASL
52.0N 0.1E


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