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fairweather
30 November 2020 16:17:05


 


I'd stand by it. There are many situations where -3C is enough to be confident the precip will be snow. Ahead of a warm front with coherent precip the lapse rate is low (due to WAA advection at high levels), the air is very dry and the wind tends to be slack.


Provided the front is coherent and some cold air was established before it came in (even 1 or 2 days of a mediocre northerly would be enough) I'd be very suprised to see rain with T850s at -3C.


 


The snow event at around 192 hours is exactly that scenario which is why you can almost ignore the uppers and know the precip will be snow away from the far west.


The end of this week isn't quite that clear cut ofc, occluding low rather than a strong warm front into cold air.


 


Originally Posted by: Quantum 


Well yes, as you have just stated above it requires a lot of preconditions to come together at -3C, so not really "easily", that's all I'm saying.


S.Essex, 42m ASL
Martybhoy
30 November 2020 16:19:23

It's getting exciting. I tend to come here every year most days between September and March just to see what you guys are saying for snow and cold. 


I'm in Scotland, rural East Ayrshire, 200m above sea level. We had some cracking frosts in September and early October but not much of note since. 


200m above sea level
Rural East Ayrshire
Near to the village of Sorn
fairweather
30 November 2020 16:21:05


Much better positions of the initial LP on Thursday Friday, keeps the majority of the UK inside the Colder air


 


Snow depths by Friday Morning


Chart image


Originally Posted by: Russwirral 


I look forward to the reports of 9cm of snow in Hampshire on Friday but I'm not holding my breath. 


S.Essex, 42m ASL
Shropshire
30 November 2020 16:22:00

Interesting WAA going to the Western side of Greenland at T192 on the GFS.


 


 


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.
Russwirral
30 November 2020 16:26:33


Interesting WAA going to the Western side of Greenland at T192 on the GFS.


 


 


Originally Posted by: Shropshire 


 


Aye - we frequently hear the saying "complex area of Low Pressure" 


 


Its rare we say " a complex area of High Pressure", as usually theyre pretty well defined jelly fish like slabs on the maps..


 


But that area to the north of us is very much a big complex High pressure cell that has all sorts of complications going on


 


Netweather GFS Image


 


Maybe that WAA will kick it into touch 


Ally Pally Snowman
30 November 2020 16:34:10

GEM also going for a major snow event Friday. 


Bishop's Stortford 85m ASL.
Brian Gaze
30 November 2020 16:35:32

Arpege 12z seems much less interested.


https://www.theweatheroutlook.com/twodata/arpege.aspx?run=12&charthour=68&chartname=ukpreciptype&chartregion=uk&charttag=Precip%20type


 


Brian Gaze
Berkhamsted
TWO Buzz - get the latest news and views 
"I'm not socialist, I know that. I don't believe in sharing my money." - Gary Numan
Gooner
30 November 2020 16:38:58

Very different from GFS this time around 



Remember anything after T120 is really Just For Fun



Marcus
Banbury
North Oxfordshire
378 feet A S L


ballamar
30 November 2020 17:08:08
Hopefully GFS has over played a pulse from the jet, deflected to where we don’t want by the Azores high.
Downpour
30 November 2020 17:46:26


Much better positions of the initial LP on Thursday Friday, keeps the majority of the UK inside the Colder air


 


Snow depths by Friday Morning


Chart image


Originally Posted by: Russwirral 


 


Looks like snow for Brian across the Chiltern Hills, I might have a drive over there Saturday if that forecast holds. 


Chingford
London E4
147ft
Rob K
30 November 2020 17:49:24


Much better positions of the initial LP on Thursday Friday, keeps the majority of the UK inside the Colder air


 


Snow depths by Friday Morning


Chart image


Originally Posted by: Russwirral 


I would certainly bank that one please.


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
Gooner
30 November 2020 18:16:15

I like what the Control is trying to do



Remember anything after T120 is really Just For Fun



Marcus
Banbury
North Oxfordshire
378 feet A S L


Russwirral
30 November 2020 18:34:02


I like what the Control is trying to do



Originally Posted by: Gooner 


 


Aye, seemingly sticks with the block and slips things underneath it.  Bank


Saint Snow
30 November 2020 19:16:47


I like what the Control is trying to do



Originally Posted by: Gooner 


 


That is a thing of beauty. 




Martin
Home: St Helens (26m asl) Work: Manchester (75m asl)
A TWO addict since 14/12/01
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Aneurin Bevan
Bertwhistle
30 November 2020 19:23:28

Plymouth showing a snow row of 17 around 5th.


5 days away.


Bertie, Itchen Valley.
Retire while you can still press the 'retire now' button.
Gooner
30 November 2020 19:32:13

OP on the high side 


Chart image


Remember anything after T120 is really Just For Fun



Marcus
Banbury
North Oxfordshire
378 feet A S L


Russwirral
30 November 2020 19:45:46
ECM has a couple of snowy passes at the UK before the LP fizzles out...

Focusing on the end of the run, and as much as weve seen hints of Atlantic fire up, on this run we see the Atlantic just start to nudge south.... this aligns with the track of LPs previous being steered by the block...


It could be we are about to venture into a very interesting locked in pattern .... all the signs are there...
Polar Low
30 November 2020 19:54:54

very tricky Friday huge 850 scatter hints of Evap cooling across the set at 12z and 15z mostly all cold at the surface no 12 hits the jackpot  and a few others are  just about cold enough  imo
London 850


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


London T


http://www.meteociel.fr/modeles/gefs_table.php?x=0&y=0&lat=51.5085&lon=-0.12574&run=12&ext=fr&mode=7&sort=0




OP on the high side 


Chart image


Originally Posted by: Gooner 

Bertwhistle
30 November 2020 20:11:26


very tricky Friday huge 850 scatter hints of Evap cooling across the set at 12z and 15z mostly all cold at the surface no 12 hits the jackpot  and a few others are  just about cold enough  imo
London 850


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


London T


http://www.meteociel.fr/modeles/gefs_table.php?x=0&y=0&lat=51.5085&lon=-0.12574&run=12&ext=fr&mode=7&sort=0


 


Originally Posted by: Polar Low 


Yes there are 3 beautiful waves in P12. But most of the Ens spread is trending well below the long term line. Nice on the eve of Dec to contemplate the possibilities.


Bertie, Itchen Valley.
Retire while you can still press the 'retire now' button.
tallyho_83
30 November 2020 20:17:23


Plymouth showing a snow row of 17 around 5th.


5 days away.


Originally Posted by: Bertwhistle 


Yes - I wondered when we will see an upgrade in the cold and wintry potential in the shorter term soon? - Perhaps this is the start!?


GFS Op run is one of the milder options.


Home Location - Kellands Lane, Okehampton, Devon (200m ASL)
---------------------------------------
Sean Moon
Magical Moon
www.magical-moon.com


White Meadows
30 November 2020 21:05:35

ECM has a couple of snowy passes at the UK before the LP fizzles out...

Focusing on the end of the run, and as much as weve seen hints of Atlantic fire up, on this run we see the Atlantic just start to nudge south.... this aligns with the track of LPs previous being steered by the block...


It could be we are about to venture into a very interesting locked in pattern .... all the signs are there...

Originally Posted by: Russwirral 


Looks pretty bland to me: https://www.wetterzentrale.de/en/topkarten.php?map=1&model=ecm&var=1&run=12&time=240&lid=OP&h=0&mv=0&tr=24#mapref


Huge Azores high, budging itself into Iberia, retreating Siberian high, nasty low spinning off the eastern seaboard... Am I missing something?

Brian Gaze
30 November 2020 21:29:25

December 1st. (145 years ago tomorrow). 



Brian Gaze
Berkhamsted
TWO Buzz - get the latest news and views 
"I'm not socialist, I know that. I don't believe in sharing my money." - Gary Numan
Shropshire
30 November 2020 21:30:46

A good ECM mean in the extended range with a pronounced -ve height anomaly over mainland Europe and the core of the trop PV well away from it's usual Greenland home. 


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.
White Meadows
30 November 2020 22:16:48
Someone’s been on the Sherry a little early.

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