Remove ads from site

Bertwhistle
22 December 2015 09:00:36

Great link Doc; the colours give an instant flash of the cooler and also the more inconsistent times.


Cheers


Bertie


Bertie, Itchen Valley.
Retire while you can still press the 'retire now' button.
Retron
22 December 2015 09:07:21


Sounds a post of desperation I think but you could well be right. I see little light on the horizon to lighten the mood with the ECM 10 day Mean maintaining the patterning at Day 10 and no doubt beyond.


http://www.wetterzentrale.de/pics/Reem2401.gif


Originally Posted by: GIBBY 


The mean really isn't the be all and end all, although I know you like them. They generally show the climatological norm at that range anyway, it takes something really special to show anything different.


Here's a more detailed view - it's no surprise that yet again the op was at the top of the pile by the end of its run!



 


Leysdown, north Kent
doctormog
22 December 2015 09:11:33


 


Sounds a post of desperation I think but you could well be right. I see little light on the horizon to lighten the mood with the ECM 10 day Mean maintaining the patterning at Day 10 and no doubt beyond.


http://www.wetterzentrale.de/pics/Reem2401.gif


My full morning report can be read HERE 


Originally Posted by: GIBBY 


Seriously Martin? Of course Andy's pessimistic guesswork may be correct but with the massive range of options across the northern latitudes by day 10 on the ECM output such conclusions simply cannot be drawn from the ECM chart. It is an option but only one of many. 


There are times when the models display high confidence levels (statistically), this is not one of them http://modeles.meteociel.fr/modeles/gens/ecmwf/graphe_ens3.php?mode=2&x=&y=&run=0&lat=57.125506072874494&lon=-2.169811320754718&runpara=0


If it turns out Andy's (and others') two month forecasts based on 10 days of selected data are correct I'm sure they will be lauded as excellent forecasts but they are no more than guesswork based on continuation of the status quo.


Failure to recognise probability and to go with the most likely option as the only one is risky even if you do end up with the "right answer".


Mind you it's a win win and an easy option isn't it? Forecast mild and it's mild and you can say "I told you so", forecast mild and it turns cold and no one cares that you were wrong! (And forecast or discuss anything else and you're labelled as unrealistic, naive, immature or a cold ramper regardless of the analysis*). 


*These labels are all from personal experience in past years. 


Bertwhistle
22 December 2015 09:14:25


 


The mean really isn't the be all and end all, although I know you like them. They generally show the climatological norm at that range anyway, it takes something really special to show anything different.


Here's a more detailed view - it's no surprise that yet again the op was at the top of the pile by the end of its run!



 


Originally Posted by: Retron 


Those charts are another great visual; we would expect the ranges to increase with time, so I always find it fascinating that there are some smaller ranges later (eg 2m mx on 28th) and conversely (as on 25th) some earlier wider ranges. How can the early wider ranges (presumably reflecting greater uncertainty in the short term) then narrow again- surely all the different model outcomes that lead to the early uncertainty would have an almost logarithmic tendency to widen further later on?


Cheers


Bertie


Bertie, Itchen Valley.
Retire while you can still press the 'retire now' button.
Polar Low
22 December 2015 09:19:06

Indeed Michael



 


Seriously Martin? Of course Andy's pessimistic guesswork may be correct but with the massive range of options across the northern latitudes by day 10 on the ECM output such conclusions simply cannot be drawn from the ECM chart. It is an option but only one of many. 


There are times when the models display high confidence levels (statistically), this is not one of them http://modeles.meteociel.fr/modeles/gens/ecmwf/graphe_ens3.php?mode=2&x=&y=&run=0&lat=57.125506072874494&lon=-2.169811320754718&runpara=0


If it turns out Andy's (and others') two month forecasts based on 10 days of selected data are correct I'm sure they will be lauded as excellent forecasts but they are no more than guesswork based on continuation of the status quo.


Failure to recognise probability and to go with the most likely option as the only one is risky even if you do end up with the "right answer".


Mind you it's a win win and an easy option isn't it? Forecast mild and it's mild and you can say "I told you so", forecast mild and it turns cold and no one cares that you were wrong! (And forecast or discuss anything else and you're labelled as unrealistic, naive, immature or a cold ramper regardless of the analysis*). 


*These labels are all from personal experience in past years. 


Originally Posted by: doctormog 

doctormog
22 December 2015 09:21:30

Bert, I think the changes are from one regime to another or as low pressure systems move close by then pass leaving more "stable conditions." (Hence a decrease in uncertainty). It seems to be at times of transition of some sort we get the largest range (unsurprisingly I guess!) Boxing Day is a good example.


Bertwhistle
22 December 2015 09:31:55


Bert, I think the changes are from one regime to another or as low pressure systems move close by then pass leaving more "stable conditions." (Hence a decrease in uncertainty). It seems to be at times of transition of some sort we get the largest range (unsurprisingly I guess!) Boxing Day is a good example.


Originally Posted by: doctormog 



Bertie, Itchen Valley.
Retire while you can still press the 'retire now' button.
Solar Cycles
22 December 2015 09:34:49

I think despondency in the short term is fine but with so much uncertainty in the medium term writing of winter would be very foolhardy, lest we forget that the MetO GLOSEA5 model which has been consistent throughout this winter is going for flip to a more blocked pattern to become established from next month through to March.

Shropshire
22 December 2015 09:38:29


I think despondency in the short term is fine but with so much uncertainty in the medium term writing of winter would be very foolhardy, lest we forget that the MetO GLOSEA5 model which has been consistent throughout this winter is going for flip to a more blocked pattern to become established from next month through to March.


Originally Posted by: Solar Cycles 


 


But that's subject to change like anything else - I suspect the final coup de grace will be when the METO update their 3 monthly outlook and say that they expect these conditions to continue throughout the winter.


 


 


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.
Maunder Minimum
22 December 2015 10:01:31


 


That is a 'precision' long fetch south westerly with high and low pressure systems perfectly aligned to produce for the UK exceptional warmth, wind and rain, if only the weather could send northerly or easterly winds at us with such precision!


I really don't see any sign of a pattern change I really don't, I would bet a months wages now that both January and February will be mild although maybe somewhat drier.


As in 1988/89 cold weather will probably arrive in April.


Andy


Originally Posted by: Andy Woodcock 


I am sure you are correct about January - you just know it will be the case, since it invariably is. January is often the mildest UK month of what is laughingly termed winter in this damp spot on the Globe, in any case.


February may be a different matter - far too early to have a clue about that. Even the LRFs have suggested colder options in the later winter months, so who knows.


New world order coming.
doctormog
22 December 2015 10:05:33


  


But that's subject to change like anything else - I suspect the final coup de grace will be when the METO update their 3 monthly outlook and say that they expect these conditions to continue throughout the winter.


 


Originally Posted by: Shropshire 



Retron
22 December 2015 10:05:53

This is getting daft now - multiple people writing off the whole of January before it's even begun!

Nobody has a clue what the weather will be like in two weeks time, let alone 5 and a half weeks (which is how far away the end of January is).


In fact, let's do an experiement. Here's the ECM mean chart for the 1st Jan, a chart much-beloved by some and one which I regard as nigh on useless. Let's see what the actual chart is like on the day - I reckon pressure will be higher to the NE than is shown here. Furthermore, there won't be such a long, generic high near the Azores... that's clearly a phantom based on more robust highs located in differing places.


(Edited as the previous auto-generated link name had "wa nk" in it - and that was censored by the forum!)



Leysdown, north Kent
Bertwhistle
22 December 2015 10:07:57


 


I am sure you are correct about January - you just know it will be the case, since it invariably is. January is often the mildest UK month of what is laughingly termed winter in this damp spot on the Globe, in any case.


February may be a different matter - far too early to have a clue about that. Even the LRFs have suggested colder options in the later winter months, so who knows.


Originally Posted by: Maunder Minimum 


Don't give up hope. Since 2000, January has been the coldest of the winter months more often than it has been the warmest. It is often 2nd, however.


Bertie, Itchen Valley.
Retire while you can still press the 'retire now' button.
SJV
22 December 2015 10:11:54


 


Don't give up hope. Since 2000, January has been the coldest of the winter months more often than it has been the warmest. It is often 2nd, however.


Originally Posted by: Bertwhistle 


So give up hope then? 


In any case, I can see how people might think January will turn out mild as well, but IMO February is too far away to call.


 


 

doctormog
22 December 2015 10:12:28

No wonder there is such a spread on Boxing Day http://www.wetterzentrale.de/pics/Rtavn1082.gif


Anyway back to guessing the next 10 weeks of weather 


Bertwhistle
22 December 2015 10:13:24


 


So give up hope then


In any case, I can see how people might think January will turn out mild as well, but IMO February is too far away to call.


 


 


Originally Posted by: SJV 


No, just hope for two cold months.


Bertie, Itchen Valley.
Retire while you can still press the 'retire now' button.
Polar Low
22 December 2015 10:26:04

Good Idea Darren getting tiring trying to explain mean chars of 10 days or more



This is getting daft now - multiple people writing off the whole of January before it's even begun!

Nobody has a clue what the weather will be like in two weeks time, let alone 5 and a half weeks (which is how far away the end of January is).


In fact, let's do an experiement. Here's the ECM mean chart for the 1st Jan, a chart much-beloved by some and one which I regard as nigh on useless. Let's see what the actual chart is like on the day - I reckon pressure will be higher to the NE than is shown here. Furthermore, there won't be such a long, generic high near the Azores... that's clearly a phantom based on more robust highs located in differing places.


(Edited as the previous auto-generated link name had "wa nk" in it - and that was censored by the forum!)



Originally Posted by: Retron 

Rob K
22 December 2015 10:28:28


(Edited as the previous auto-generated link name had "wa nk" in it - and that was censored by the forum!)


Originally Posted by: Retron 


Somehow appropriate for the charts we have been seeing of late!


But yes, mean charts are pretty useless. It's like adding up the value of the coins in your pocket and working out the average, and using that to predict what you will pick at random. You might pull out a penny or a £2 coin but you're not going to pull out a 27.3 pence coin!


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
Gusty
22 December 2015 10:28:53

Off topic don't feed the trolls. On topic the transference of warmth from the tropic to the pole is remarkable yet again on the 6z. 



Steve - Folkestone, Kent
Current conditions from my Davis Vantage Vue
https://www.wunderground.com/dashboard/pws/IFOLKE11 
Join Kent Weather on Facebook.
https://www.facebook.com/stevewall69/ 



David M Porter
22 December 2015 10:31:59


 


 


But that's subject to change like anything else - I suspect the final coup de grace will be when the METO update their 3 monthly outlook and say that they expect these conditions to continue throughout the winter.


 


 


Originally Posted by: Shropshire 


I think we'd be best to simply wait and see what they say for the second half of the winter before passing judgement, don't you?


Lenzie, Glasgow

"Let us not take ourselves too seriously. None of us has a monopoly on wisdom, and we must always be ready to listen and respect other points of view."- Queen Elizabeth II 1926-2022
Gusty
22 December 2015 10:38:40

216 hours 6z GFS. No interaction with the Arctic High. All energy pushing northwards starting to over-ride the Scandi block. Atlantic wins. 



Steve - Folkestone, Kent
Current conditions from my Davis Vantage Vue
https://www.wunderground.com/dashboard/pws/IFOLKE11 
Join Kent Weather on Facebook.
https://www.facebook.com/stevewall69/ 



Polar Low
22 December 2015 10:44:33

Nice slumping jet as the ride over stops its that issue with that little short wave that need sorting many runs required I feel


Steve it does look slightly better with the alignment thou


Gusty
22 December 2015 10:45:19

A snowy New Year......For Greece. .



Steve - Folkestone, Kent
Current conditions from my Davis Vantage Vue
https://www.wunderground.com/dashboard/pws/IFOLKE11 
Join Kent Weather on Facebook.
https://www.facebook.com/stevewall69/ 



GIBBY
22 December 2015 10:49:01


This is getting daft now - multiple people writing off the whole of January before it's even begun!

Nobody has a clue what the weather will be like in two weeks time, let alone 5 and a half weeks (which is how far away the end of January is).


In fact, let's do an experiement. Here's the ECM mean chart for the 1st Jan, a chart much-beloved by some and one which I regard as nigh on useless. Let's see what the actual chart is like on the day - I reckon pressure will be higher to the NE than is shown here. Furthermore, there won't be such a long, generic high near the Azores... that's clearly a phantom based on more robust highs located in differing places.


(Edited as the previous auto-generated link name had "wa nk" in it - and that was censored by the forum!)



Originally Posted by: Retron 


I understand what you and others are saying but you have to look at themes rather than specifics in a mean chart and the above replicates what the mean chart has been showing for more than a month now and the general theme of the synoptics of this chart over the last month has been exactly what we have witnessed. That's not to say some perturbations show colder and some milder, if the balance is towards more colder members or vice versa than the chart would deviate from the above pattern but the overall theme of the 10 days chart is what becomes more likely otherwise why would they produce them. I know that the Met 6-15 Day update reflects the findings of this chart more often than not.


Incidentally ECM still has the best verification rates of the big three still today.


http://www.emc.ncep.noaa.gov/gmb/STATS_vsdb/allmodel/daily/cor/cor_day10_PMSL_MSL_G2NHX.png


Martin G
Kilmersdon Radstock Bath Somerset



Look up my New Facebook Weather Page  for all the latest up to the minute weather stories as they happen
Solar Cycles
22 December 2015 10:50:52


 


 


But that's subject to change like anything else - I suspect the final coup de grace will be when the METO update their 3 monthly outlook and say that they expect these conditions to continue throughout the winter.


 


 


Originally Posted by: Shropshire 

That was the updated one from last week I mentioned which shows HLB and lowering of height in Europe as we move forward

Remove ads from site

Ads