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Russwirral
17 January 2019 17:17:58


 


Looks virtually unchanged to me. By 174 hours the GEFS mean is almost identical, perhaps half a degree colder than the 6Z for London.


 



 


Only difference is the operational was slightly above the mean instead of slightly below it, as on the previous run.


Originally Posted by: Rob K 


 


Good to know, seemingly a milder outlier then


ballamar
17 January 2019 17:19:26

It’s just variations on a theme of colder and less cold interludes as has been the pattern for quite some time for the second half of January. Normal GFS op run volatility but again in isolation it is worth as much as the 06z GFS op run. If the ECM shows a similiar trend that both continue until tomorrow evening then it is worth noting.

Originally Posted by: doctormog 


Stop getting too excited !!!

Rob K
17 January 2019 17:19:55


 


 


Good to know, seemingly a milder outlier then


Originally Posted by: Russwirral 


Not an outlier, it's in the pack, just slightly on the milder side versus slightly on the colder side (for the initial event on Tuesday etc)


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
Rob K
17 January 2019 17:23:52

P11 is an interesting one.... "clash of the purples"!



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
Saint Snow
17 January 2019 17:23:54


 


Looks virtually unchanged to me. By 174 hours the GEFS mean is almost identical, perhaps half a degree colder than the 6Z for London.


 



 


Only difference is the operational was slightly above the mean instead of slightly below it, as on the previous run.


Originally Posted by: Rob K 


 


The slightly milder Op has a catastrophic effect on the snow cover map, though. Very little away from higher altitude areas.



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
Rob K
17 January 2019 17:27:58

The NW contingent can't be too unhappy about the GFSP snow cover map at 114hrs.


 



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
Chunky Pea
17 January 2019 17:28:14

One thing that has struck me on the model runs lately, even with some of the more 'stellar' ones, is the lack of any deep surface cold over most of the continent. 


http://www.wetterzentrale.de/maps/GFSOPEU12_300_5.png


 


Certainly E/NE Europe seeing very low temps at times, but nothing that isn't out of the ordinary for this time of year. 


Current Conditions
https://t.ly/MEYqg 


"You don't have to know anything to have an opinion"
--Roger P, 12/Oct/2022
Jeff
  • Jeff
  • Advanced Member
17 January 2019 17:32:21
All a bit steady as she goes. Nothing like the flips of 24 hours ago.

If while we wait on the ECM, you want some eye popping synoptics to keep you interested, take a look at the North American GFS Op at 348h. Some record setting lows/highs, blizzards, gales, with threat to transport, life and everything else, even in a country that usually copes. I cant see whether the 850s actually go below -40c because thats where the scale stops. I know its miles out but their patterns are usually easier to predict further out than ours and their forecasters are already mentioning it will be much worse than their freeze up of next week.I think the whole hemisphere is going to have a very interesting start to February.

http://www.wetterzentrale.de/de/topkarten.php?map=5&model=gfs&var=2&run=12&time=348&lid=OP&h=0&mv=0&tr=3#mapref 

Jeff


On the East/West Sussex Border
70m ASL
soperman
17 January 2019 17:34:43


 


They've briefed to the government a 70% chance of severe cold in early Feb. It was reported in the ST last week.


Originally Posted by: Brian Gaze 


Hi Brian


 


Yes, I am aware but earlier this week it was 25% for next week / end Jan

LA2B MeridFlowEuro09
17 January 2019 17:42:46

It looks like less cold air over the UK from Friday to Saturday, some cold weather but settled on Sunday, cold and chilly weather and dry on Monday, but Monday evening or late afternoon to Wednesday Midday- NW SE Tracking PV Low with very low Sub-528 down to 520 dam line on -5 to -7 degrees C at 2 miles high 850hPa level cold NW winds are being shown, Monday evening to Wednesday midday- very cold air with sleet and snow showers, after a SE diving Low from North Atlantic hits the UK and Western Europe.


And GFS Para, ICON and the GEM, as well as the UKMO, show the next PV Low, with a large but quickly shrinking mild sector shall arrive over the UK by T168hours with some heavy rain Thursday and early on Friday (24-25th Jan. 2019), with cold air maybe by Friday the 25th January with more cold arctic NW winds, and wintry showers.  Less cold Wednesday late afternoon to Thursday midday aka 23-24th January as that NW Atlantic Low is expected to track to UK North Europe later next week from the Western NW Atlantic it moves from there as from Monday and Tuesday next week.


That looks like quite a deep Low..


Lol, Behold, Behemoth... I await with baited breath-- today's 12z ECMWF runs.


After that we shall hope that early tomorrow morning the UKMO, GFS, and ECMWF and ICON Models continue backing up good potential.  That other Low may visit us come the 24th and 25th to tease us!.


Climate is warming up, Scotland and N Ireland and North England still often gets some Winter frost, ice and snow, November to March, but the SE and South UK including S Central England and Wales, together with the West and North through the year, they sometimes get more rain than London and S SE England, where some longer dry fine spells without much heavy rain is seen every year.

The North Atlantic Sea often gets some much Colder Wintry conditions from November to March Months, and Mild SW and South winds tend to be more frequent over the East and SE of North Atlantic Sea, as the Azores High tends to stay in charge. 

With this warmth and heat, the Central and South UK has become mostly free of snow and frost.
Saint Snow
17 January 2019 17:43:14


The NW contingent can't be too unhappy about the GFSP snow cover map at 114hrs.


 



Originally Posted by: Rob K 


 


Perhaps if you live up a hill


 



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
Gooner
17 January 2019 17:44:55

www.meteociel.fr/modeles/gefs_table.php?ext=1&x=&lat=51.5085&lon=-0.12574&ville=Londres


 


Still decent 


Remember anything after T120 is really Just For Fun



Marcus
Banbury
North Oxfordshire
378 feet A S L


Gavin D
17 January 2019 17:46:46

Rob K
17 January 2019 17:54:10

All a bit steady as she goes. Nothing like the flips of 24 hours ago.

If while we wait on the ECM, you want some eye popping synoptics to keep you interested, take a look at the North American GFS Op at 348h. Some record setting lows/highs, blizzards, gales, with threat to transport, life and everything else, even in a country that usually copes. I cant see whether the 850s actually go below -40c because thats where the scale stops. I know its miles out but their patterns are usually easier to predict further out than ours and their forecasters are already mentioning it will be much worse than their freeze up of next week.I think the whole hemisphere is going to have a very interesting start to February.

http://www.wetterzentrale.de/de/topkarten.php?map=5&model=gfs&var=2&run=12&time=348&lid=OP&h=0&mv=0&tr=3#mapref

Jeff

Originally Posted by: Jeff 


Yes, if you think our ensembles look like spaghetti sometimes, take a look at the New York one:


 



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
Rob K
17 January 2019 17:58:44

Jet stream diving a long way south on the GFSP.



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
Bertwhistle
17 January 2019 18:09:59

London snow row 126, mean in GEFS back down where needed: -5 from about 21st to end; ECM looking sound. Bits coming together. Cold spell seems a near certainty. How cold, how long, how much snow all undecided.


https://www.theweatheroutlook.com/twodata/chart.aspx?chart=/charts/gefs/gefsens850london0.png?cb=862


 


Bertie, Itchen Valley.
Retire while you can still press the 'retire now' button.
doctormog
17 January 2019 18:12:47


London snow row 126, mean in GEFS back down where needed: -5 from about 21st to end; ECM looking sound. Bits coming together. Cold spell seems a near certainty. How cold, how long, how much snow all undecided.


https://www.theweatheroutlook.com/twodata/chart.aspx?chart=/charts/gefs/gefsens850london0.png?cb=862


 


Originally Posted by: Bertwhistle 


Yes, I was surprised how chilly the ensemble data were (this one is for here) 



Ally Pally Snowman
17 January 2019 18:14:50


Jet stream diving a long way south on the GFSP.



Originally Posted by: Rob K 


 


Para is stunning from 216h onwards.  Very good GEFS as well.  We await the ECM 


 


Bishop's Stortford 85m ASL.
ballamar
17 January 2019 18:16:20


 


 


Para is stunning from 216h onwards.  Very good GEFS as well.  We await the ECM 


 


Originally Posted by: Ally Pally Snowman 


 


early signs good on ECM - should be a good run

Arcus
17 January 2019 18:26:16
ECM more progressive on that storm than on the 00z, disruption on the low occurs further east. Certainly a trend on the 12zs, but I wouldn't call it a solution just yet.
Ben,
Nr. Easingwold, North Yorkshire
30m asl
Heavy Weather 2013
17 January 2019 18:26:52
GFS Ensembles are wonderful.

We now have some runs touching -15 850s
Mark
Beckton, E London
Less than 500m from the end of London City Airport runway.
kmoorman
17 January 2019 18:30:15

Slow drift down on the snow rows continues for Brighton.  Trend? (actually the trend overall is UP)



Home: Durrington, Worthing, West Sussex. (16 ASL)
Work: Canary Wharf, London
Follow me on Twitter @kmoorman1968
Jeff
  • Jeff
  • Advanced Member
17 January 2019 18:30:55

ECM more progressive on that storm than on the 00z, disruption on the low occurs further east. Certainly a trend on the 12zs, but I wouldn't call it a solution just yet.

Originally Posted by: Arcus 


 


..but it seems to have missed its “wave” and now seem to be stalling at 144?


On the East/West Sussex Border
70m ASL
Shropshire
17 January 2019 18:31:10

ECM fine at T144, but no margin for error !


 


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.
fairweather
17 January 2019 18:33:52

Please be an outlier, please be an outlier, please be an outlier

Originally Posted by: Russwirral 


Well unfortunately it's not. It is slap bang in the middle of the set except 29th to 31st where it is higher before it drops back into the pack. It goes from -10C to 0C at the same time that the 06z went from -10C to, with a short blip to -5C then on to -12C at the end. That's how different it is. The 06z op was an outlier.. Not that the ops mean that much and the ensemble is okay maintaining -5C or just below and of course the spread is still there so it could go either way. One of the issues is once you are well below the long term mean any upward warming trends look worse than they are because our brains get trained into seeing up as bad!


S.Essex, 42m ASL

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