Nordic Snowman
25 November 2017 17:25:00

Based on the op, a less cold set up for next weekend after a cold week (Monday aside). It also looks like a rather chilly set up beyond next weekend again.


One thing of note is that the current output is anything but zonal and IMO this can signal for something more interesting in the weeks ahead as this autumn is not seeing the stormy SW'lies which so often plague our shores.


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Joe Bloggs
25 November 2017 17:30:06

I’ve just had a look at the GEFS and the majority go for a Greenland block with winds from a northerly quarter for the UK in the latter stages. 


This is the mean at T+318 , a very strong signal. 


http://www.wetterzentrale.de/maps/GFSAVGEU12_318_1.png


 



Manchester City Centre, 31m ASL

Chunky Pea
25 November 2017 17:34:03

Originally Posted by: Joe Bloggs 


 


Yes if you like mild, wet and stormy weather (which I know you do!) 



I can do cold and stormy too. Just not a fan of benign N or NW'lys as they usually bring with them poor aesthetics. 


Current Conditions
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doctormog
25 November 2017 17:34:30

Originally Posted by: Joe Bloggs 


I’ve just had a look at the GEFS and the majority go for a Greenland block with winds from a northerly quarter for the UK in the latter stages. 


This is the mean at T+318 , a very strong signal. 


http://www.wetterzentrale.de/maps/GFSAVGEU12_318_1.png


 



Yes and tempting fate but I wouldn’t be surprised, based on the GFS ensembles if the ECM op run went for a colder evolution. Yes, it is just conjecture I know but it is often the case. Interesting synoptics for sure.


tallyho_83
25 November 2017 17:39:33

Originally Posted by: Chunky Pea 


 


It would take a bit of effort the find anything remotely interesting about a set up like this though (which follows on from that 240 chart)


 



 


 



 


Not interesting!? - isn't this A SIGNAL for colder weather ? For a min i thought Denmark was the UK and we were on the milder side of the low pressure jet but to me - if you follow the isobar bars the air /wind is originating from the Norwegian sea and coming all the way around the LP past Iceland too,.!? Also no HP over Azores or even Spain or Portugal. in fact PRESSURE remainds relatively low across many parts of Europe with the UK and Ireland being the coldest parts. MOST Of Scandinavia etc is under mild southerly winds!?


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Retron
25 November 2017 17:41:19

Originally Posted by: Joe Bloggs 


I’ve just had a look at the GEFS and the majority go for a Greenland block with winds from a northerly quarter for the UK in the latter stages. 


This is the mean at T+318 , a very strong signal. 


http://www.wetterzentrale.de/maps/GFSAVGEU12_318_1.png



Take out the 4 or so stragglers and you'd have an even stronger signal. It's really quite remarkable to see such a strong "not the usual zonality" type signal that far out!


Something else of note is that the London ensembles now show several runs dipping below zero for 12 hours at a time, as opposed to the "pinprick" single time period below zero as shown in the last few runs.


Looks like it's similar up north - just saw the Doc's post as I was writing this.


(Edit: that -10C isotherm is still being very elusive, however. It's still fascinating output, regardless!)


Leysdown, north Kent
Phil G
25 November 2017 17:44:42
GFS generally has high pressure to our west and low pressure to our east with a cold northerly feed until this time next week.
Around +192, lots of little low and high pressures on the scene and the pattern changes to a more north westerly, then westerly flow to the end of the reliable.
Be interesting what ECM does around +192 and how it treats the set up thereafter.
Brian Gaze
25 November 2017 17:45:59

London 12 GEFS update. At a glance it looks like there's more support for less cold conditions at the start of Dec but in the longer term they are colder than the 6z set. 



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Gandalf The White
25 November 2017 17:47:15

Originally Posted by: Chunky Pea 


 


It would take a bit of effort the find anything remotely interesting about a set up like this though (which follows on from that 240 chart)


 



 


 



The atmosphere is a fluid and you need to look at a sequence of charts to see what is evolving. Even with this chart it looks more interesting if you look at the source of the air mass and the upper air temperatures.


Location: South Cambridgeshire
130 metres ASL
52.0N 0.1E


Gandalf The White
25 November 2017 17:53:34

Originally Posted by: Phil G 

GFS generally has high pressure to our west and low pressure to our east with a cold northerly feed until this time next week.
Around +192, lots of little low and high pressures on the scene and the pattern changes to a more north westerly, then westerly flow to the end of the reliable.
Be interesting what ECM does around +192 and how it treats the set up thereafter.


Given how different the evolution was even during the latter part of the high res section I think that the  'reliable'  might end around T+168.


Location: South Cambridgeshire
130 metres ASL
52.0N 0.1E


Gandalf The White
25 November 2017 18:20:51

ECM 12z out to T+96 and it maintains the upper heights up to the Pole, very similar to GFS.


UKMO never gets the upper heights quite as far north and keep the surface high centred west of Ireland and that is why the block sinks more quickly.


The reliable timeframe may not even go beyond day 5.


Location: South Cambridgeshire
130 metres ASL
52.0N 0.1E


Whether Idle
25 November 2017 18:40:25

A slack no-mans-land (though a chilly one - in the east) depicted on the ECM 168:


ecm 168


 


Dover, 5m asl. Half a mile from the south coast.
Whether Idle
25 November 2017 18:45:37

Good evening Mr beast, a gentle fellow? Would be very chilly, borderline cold


 


ecm 192


Dover, 5m asl. Half a mile from the south coast.
Gandalf The White
25 November 2017 18:46:55

Cold easterly at T+192



Location: South Cambridgeshire
130 metres ASL
52.0N 0.1E


Whether Idle
25 November 2017 18:48:33

Originally Posted by: Gandalf The White 


Cold easterly at T+192




Tasty.


Dover, 5m asl. Half a mile from the south coast.
Shropshire
25 November 2017 18:49:58

Well a really interesting period coming up, a decent northerly spell followed by uncertainty as to where the jet energy goes which will determine the pattern thereafter, what we can say is that zonality appears to be off the table for the next couple of weeks, which is rare in the modern era. 


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.
Gandalf The White
25 November 2017 18:53:40

Originally Posted by: Shropshire 


Well a really interesting period coming up, a decent northerly spell followed by uncertainty as to where the jet energy goes which will determine the pattern thereafter, what we can say is that zonality appears to be off the table for the next couple of weeks, which is rare in the modern era. 



Actually zonality is alive and well - on the other side of the planet, across the Pacific.



Location: South Cambridgeshire
130 metres ASL
52.0N 0.1E


moomin75
25 November 2017 19:01:51

Originally Posted by: Shropshire 


Well a really interesting period coming up, a decent northerly spell followed by uncertainty as to where the jet energy goes which will determine the pattern thereafter, what we can say is that zonality appears to be off the table for the next couple of weeks, which is rare in the modern era. 


Just as rare as you making a post that doesn't use the phrase "modern era"! 😂😂😂


Witney, Oxfordshire
100m ASL
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