sunny coast
17 January 2021 21:37:17

Originally Posted by: Bow Echo 


 


As a teenager in the 60's, and living in the Yorkshire Dales I can say I saw my share of deep drifting snow in that period, wonderful days. I can also say that there were many, many times when we had raw, miserable, cloudy, wet, windy weather that was just a tiny bit too warm for snow, or started off as snow, got a good blanket laid, only to hear the dreaded drip, drip drip of a slow but constant thaw and all that lovely snow and effort wasted! Temps would then stay between 3 and 6c for several days. Miserable. And just for balance...some of the summers were abysmal in the 60's. Days of cloud and 13c as the max. 22c was a heatwave.


  indeed 60s summers pretty much all poor or just awful  a very cool decade indeed . 

Rob K
17 January 2021 21:39:24

Originally Posted by: Ally Pally Snowman 


Ecm means look very very poor plenty of flooding and little snow .


https://www.wetterzentrale.de/en/topkarten.php?map=1&model=ecm&var=2&run=12&time=216&lid=AVG&h=0&mv=0&tr=24#mapref


 



 Looks almost identical to the GEFS mean at the same times (216 and 240) in terms of 850s and very similar in terms of pressure too.


I'm happy enough with the GEFS ensemble in terms of chances of cold weather so the ECM is more of the same.


Remember that the day 9 and 10 period is the absolute highest point of the mean on the GEFS too.


 


Here for comparison at T240:


GEFS mean:



ECM mean:



 


Allowing for the different map projection, the track of the 0C and -5C lines is almost identical. The ECM one "looks" milder because the WZ chart uses yellow for the >0C temperature but on Meteociel it's green and doesn't go yellow until 8C.


 


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
Shropshire
17 January 2021 21:45:03

Originally Posted by: Rob K 


 


 Looks almost identical to the GEFS mean at the same times (216 and 240) in terms of 850s and very similar in terms of pressure.


I'm happy enough with the GEFS ensemble in terms of chances of cold weather so the ECM is more of the same.


Remember that the day 9 and 10 period is the absolute highest point of the mean on the GEFS too.



Yes both ECM & GFS have both followed a similar path for a few days, it's the logical solution with the jet going under the retreating heights to the NW. But we may be seeing a trend for the Iberian High to be less influential, only minor changes are needed to get some or all parts on the colder side of the PFJ.


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.
Ally Pally Snowman
17 January 2021 21:54:04

Originally Posted by: Rob K 


 


 Looks almost identical to the GEFS mean at the same times (216 and 240) in terms of 850s and very similar in terms of pressure too.


I'm happy enough with the GEFS ensemble in terms of chances of cold weather so the ECM is more of the same.


Remember that the day 9 and 10 period is the absolute highest point of the mean on the GEFS too.


 


Here for comparison at T240:


GEFS mean:



ECM mean:



 


Allowing for the different map projection, the track of the 0C and -5C lines is almost identical. The ECM one "looks" milder because the WZ chart uses yellow for the >0C temperature but on Meteociel it's green and doesn't go yellow until 8C.


 



There both pretty rubbish if u like snow say south Birmingham . Not sharing the optimism I'm afraid. The colder spell at the end of the week looks to marginal for the south and then it gets even milder. 


 


Bishop's Stortford 85m ASL.
tallyho_83
17 January 2021 21:54:44

Originally Posted by: Shropshire 


 


The jet is already becoming very active this week - whatever happens the SSW has probably saved us from a zonality on steroids spell.



With wet weather last week and more this week you would not know the difference. It's as zonal as it can get as far as i am aware - despite a lot of Northern Blocking and negative AO/ NAO.


Home Location - Kellands Lane, Okehampton, Devon (200m ASL)
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Jiries
17 January 2021 22:12:41

Originally Posted by: tallyho_83 


 


With wet weather last week and more this week you would not know the difference. It's as zonal as it can get as far as i am aware - despite a lot of Northern Blocking and negative AO/ NAO.



Agreed as it been very wet regardless zonal or not but only way out is to get this horrible winter done early and hopefully drier warmer Spring and very dry summer to make up for it which stand a better chance since unwelcome Greenland HP on the models had been there since Dec will not last to summer.

JRobinson
17 January 2021 22:19:43

Originally Posted by: tallyho_83 


 


With wet weather last week and more this week you would not know the difference. It's as zonal as it can get as far as i am aware - despite a lot of Northern Blocking and negative AO/ NAO.



 


Im not an expert in meteorology but I can definitely say this period of weather has not been anything like zonal. 
im sure someone here can give us a correct definition of the term.

Rob K
17 January 2021 22:27:50

Originally Posted by: Ally Pally Snowman 


 


There both pretty rubbish if u like snow say south Birmingham . Not sharing the optimism I'm afraid. The colder spell at the end of the week looks to marginal for the south and then it gets even milder. 


 



If the GEFS is the trendsetter though then that is as mild as it gets. The 0C isotherm should rapidly head south again from that point onwards (and may never get that far north anyway, with all the scatter).


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
AJ*
  • AJ*
  • Advanced Member
17 January 2021 22:52:23

Originally Posted by: roadrunnerajn 


 


Don’t you just love acronyms...



Especially TLAs.


 


By the way, was there an answer to what QTR stood for?


Angus; one of the Kent crew on TWO.
Tonbridge, 40m (131ft) asl
White Meadows
Bow Echo
17 January 2021 23:17:00

Originally Posted by: AJ* 


 


 


By the way, was there an answer to what QTR stood for?



Quick Tropospheric Response


Steve D. FRMetS
Burton Latimer, Kettering, Northants


Rob K
17 January 2021 23:18:07

Originally Posted by: White Meadows 

Back to the models... Getting better:

https://www.wetterzentrale.de/en/show_diagrams.php?model=gfs&lid=ENS&var=2&bw=1&geoid=49069


P8 is a cold outlier early on, it somehow picks up a blob of very cold air in that satellite low  to the north and spins it right across the UK 



 


Not very likely I would say!


 


Quote:

By the way, was there an answer to what QTR stood for?


Quite Tired of Rain, in my case.


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
dagspot
17 January 2021 23:43:19
or Quit The Ranting (QTR) on the moaning thread?!
Neilston 600ft ASL
phlippy67
18 January 2021 00:23:18
That's what the moaning thread is for isn't it...?!
UncleAlbert
18 January 2021 01:32:36

Originally Posted by: JRobinson 


 


 


Im not an expert in meteorology but I can definitely say this period of weather has not been anything like zonal. 
im sure someone here can give us a correct definition of the term.



I am not an academic expert but I understand that the best analogy is with radio frequency. The longer the wavelength the flatter (more zonal) the flow. The shorter the wavelength the more amplified (meridional) the flow. The meridional flow shows greater oscilation. We never see perfect versions of either as there is always some oscilation and there is always some zonal fluidity. The best way to ascertain the presence of one or the other is at the 500mb height where you can see the main flow of the atmosphere that drives the weather systems.  The flow will follow the contours in similar fashion to SLP charts. Those more learned with me are welcome to add or correct.

BJBlake
18 January 2021 06:38:05

GFS Para delivers snowmaggeddon deep into FI - with PV displaced to Denmark - this set up would top trump 1987 - obviously JFF eye candy. , but otherwise - business as usual...


Brecklands, South Norfolk 28m ASL
Ally Pally Snowman
18 January 2021 06:51:24

Some colossal rainfall totals over the next 10 days especially for northern England.  Limited snow opportunities away from northern hills. In fact its mainly mild in the south.


Bishop's Stortford 85m ASL.
DEW
  • DEW
  • Advanced Member
18 January 2021 06:54:22

http://www.wxmaps.org/pix/prec4 copious rain for the next two weeks, not just the amber warning for the north on Wednesday; and the Siberian cold has wimped out.


GFS = LPs moving across from the Atlantic, particularly deep 960mb NE Scotland Fri 22nd with a brief spell of N-lies to follow; then back to the Atlantic conveyor throughout (the most S-ly of these LPs runs across the UK Fri 29th 985 mb NI).


FAX shows LP this week a day earlier i.e. Thu and deeper 950mb with lots of frontal rain preceding it.


GEFS - mild now (near norm in Scotland), cool Thu 21st to  Tue 26th with good agreement. Thereafter a suggestion of mild at first and cooler later but much variability in different runs. Rain throughout -yesterday's forecast dry slot ca  Sat 23rd has been squeezed out at least for the S.


ECM - similar to GFS at first but inclined to keep N-ly flow for longer after Fri 22nd, perhaps as long as Wed 27th


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

Chichester 12m asl
Joe Bloggs
18 January 2021 07:30:53

Originally Posted by: Ally Pally Snowman 


Some colossal rainfall totals over the next 10 days especially for northern England.  Limited snow opportunities away from northern hills. In fact its mainly mild in the south.



Morning, I think that’s a tad pessimistic, I think snow will get down to lower levels this weekend in the north and showers may be driven well inland with a westerly vector to the wind. A snapshot from GFS shows this quite well. 

https://www.wetterzentrale.de/maps/GFSOPEU00_120_1.png



Manchester City Centre, 31m ASL

DPower
18 January 2021 07:41:48

Originally Posted by: BJBlake 


GFS Para delivers snowmaggeddon deep into FI - with PV displaced to Denmark - this set up would top trump 1987 - obviously JFF eye candy. , but otherwise - business as usual...



That would be a cracking position to be in at the start of February for sure. Pressure rising to the North pulling in deep cold from the continent. Lovely. 

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