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Arcus
22 February 2018 22:02:10
I love leaving this thread for a few hours and then catching up on the models before wading through the sludge.

Kudos to the usual suspects (James, Neil et al) for trying to keep it relevant. 12z ECM ens very similar to the 00z, but tighter agreement around the mean in the short to mid-term, ens trending colder.

Loved the 9.55 week ahead on the BBC News - biggest wodge of snow I've seen for many a year for the end of the week. Off topic. Apologies.
Ben,
Nr. Easingwold, North Yorkshire
30m asl
Stormchaser
22 February 2018 22:02:32


Thought I'd sign off today with an EPS mean for next Fri that's about as good as I could have hoped for as it shows a clear signal for the trough to make it a good way across the Mediterranean which is what we need to keep that cold feed going through to the weekend .


 


Seeing that more substantial shortwave low near Iceland on the 18z GFS but the jet profile has hardly changed and ECM had a similar solution on the 12z earlier, so it's not of much concern in isolation. It may drop down around Wed-Thu time having done a large anticyclonic loop but again, that would be in keeping with the ECM 12z in which it descends as a very slack feature and adds to the instability within the deep cold pool. In other words it becomes a very long-winded snow maker! 


 


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2023's Homeland Extremes:
T-Max: 30.2°C 9th Sep (...!) | T-Min: -7.1°C 22nd & 23rd Jan | Wettest Day: 25.9mm 2nd Nov | Ice Days: 1 (2nd Dec -1.3°C in freezing fog)
Keep Calm and Forecast On
Rob K
22 February 2018 22:02:50
Pressure 40mb lower over Greenland on the 18Z GFS than the 12Z. Hoping it has just gone off on one and not about to start the biggest backtrack in modelling history...
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
SJV
22 February 2018 22:03:33

What's that in the N Sea? 


squish
22 February 2018 22:03:38

GFS has sent a shortwave up to Iceland which may throw a spanner in the works. Very different up in that area even by T90.

Originally Posted by: Rob K 


I don't think that is a problem as same on 12z , just a little later. Cold pool a tad further south, but will swing up and over UK, and may delay any breakdown from the SW . Just guessing at this stage....


D.E.W on Dartmoor. 300m asl
Snowedin3
22 February 2018 22:05:20
Don’t Panic Rob 😝
Dean Barnes
Finstock, Chipping Norton, Oxfordshire
160m ASL 525 Ft
Rob K
22 February 2018 22:05:30


What's that in the N Sea? 



Originally Posted by: SJV 


 


The same feature picked up on by the WRF that I posted a little earlier. A very small closed low that scoots across from Norway and hits the NE coast of England. GFS sends it straight through into the Wales too!


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
SJV
22 February 2018 22:06:49

Pressure 40mb lower over Greenland on the 18Z GFS than the 12Z. Hoping it has just gone off on one and not about to start the biggest backtrack in modelling history...

Originally Posted by: Rob K 


Greenie high recovers, Rob. 


And yes several models picking up the feature in the N Sea for Tues 

squish
22 February 2018 22:07:56

Pressure 40mb lower over Greenland on the 18Z GFS than the 12Z. Hoping it has just gone off on one and not about to start the biggest backtrack in modelling history...

Originally Posted by: Rob K 


 


? Its 15 mb higher at +126


 


D.E.W on Dartmoor. 300m asl
nsrobins
22 February 2018 22:08:00
Yep seen enough of GFS. Again it’s noise and the very slight S shift and delay is not an issue IMO. If anything the cold pool might be even colder when it properly arrives behind the area of snow on Tues.
Neil
Fareham, Hampshire 28m ASL (near estuary)
Stormchaser, Member TORRO
Rob K
22 February 2018 22:10:15


 


 


? Its 15 mb higher at +126


 


Originally Posted by: squish 


Yes it zips through pretty quickly and heads for the north pole, then as Stormchaser says it will just loop round the block... sorry for the panic everyone 


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
Arcus
22 February 2018 22:11:01

Yep seen enough of GFS. Again it’s noise and the very slight S shift and delay is not an issue IMO. If anything the cold pool might be even colder when it properly arrives behind the area of snow on Tues.

Originally Posted by: nsrobins 


Ah c'mon Neil, you chancer! You'll see it through to the bitter end.


Ben,
Nr. Easingwold, North Yorkshire
30m asl
Whether Idle
22 February 2018 22:11:17

This is a sound run with mere minor tweaks and variations.  Its coming for SURE


Dover, 5m asl. Half a mile from the south coast.
SJV
22 February 2018 22:12:19
Scotland in for the snow by t135 .
Rob K
22 February 2018 22:13:29


This is a sound run with mere minor tweaks and variations.  Its coming for SURE


Originally Posted by: Whether Idle 


-10 isotherm arrives at T78. The train is only coming when you can see the train.... and I think I can just see it in the distance.


 



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
Whether Idle
22 February 2018 22:16:52


 


-10 isotherm arrives at T78. The train is only coming when you can see the train.... and I think I can just see it in the distance.


 



Originally Posted by: Rob K 


I think I can see you've tied a mild-ramper tied to the track, in the middle distance. 


I think they are saying the train is never going to get here...


Dover, 5m asl. Half a mile from the south coast.
Charmhills
22 February 2018 22:18:43


Nice.


Loughborough, EM.

Knowledge is power, ignorance is weakness.

Duane.
Rob K
22 February 2018 22:19:37

Just look at those low heights in the cold flow centred right over the British Isles... beautiful



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
tallyho_83
22 February 2018 22:21:29

Can't complain if this came about:


-15@ 850 hpa too!




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


squish
22 February 2018 22:21:32

Todays charts are even better than may favourite of all time ( foot of snow at sea level in South Devon Jan 1st 1979)


http://www.wetterzentrale.de/maps/archive/1978/noaa/NOAA_1_1978123106_1.png




http://modeles.meteociel.fr/modeles/gfs/runs/2018022218/gfsnh-0-156.png?18


 


D.E.W on Dartmoor. 300m asl
Rob K
22 February 2018 22:22:12

Nationwide snow, more or less.


 



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
22 February 2018 22:23:20

Early guidance forewarning of next weeks weather was issued earlier on, and this has been further enhanced with extended outlooks in bulletins. AFAIK (commas' not being my area) public agencies and major private infrastructure will begin a daily briefing cycle as of tomorrow. To revisit previous post, latest MR output (MOG) resolving to further mute ‘breakdown€™ scenario; with continental blocking signal reinforcing through well into March. Atlantic incursions are expected with southerly deflection; considerable potential for extensive and disruptive snowfall as these air masses interact. Short term, ECM:UKMO evolution favoured and considered likeliest; corresponds well with other products and illustrates fair consistency.

















Curtesy of NW


A post from SB who works at the MET 

















 


Remember anything after T120 is really Just For Fun



Marcus
Banbury
North Oxfordshire
378 feet A S L


squish
22 February 2018 22:23:45
18z very similar to the GEM

D.E.W on Dartmoor. 300m asl
TimS
  • TimS
  • Advanced Member
22 February 2018 22:23:48

Not often you see snow like this in the Landes and Gascony, or indeed lowland Languedoc:



Brockley, South East London 30m asl
Whether Idle
22 February 2018 22:23:52


Nationwide snow, more or less.


 



Originally Posted by: Rob K 


Heavy snow into the South too, and windy, widely sub zero.  Travel chaos!


http://www.meteociel.fr/modeles/gfse_cartes.php?&ech=174&mode=2


 


Dover, 5m asl. Half a mile from the south coast.

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