The Weather Outlook

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Rob K
14 January 2026 17:13:01
GEM 12Z is on a knife edge - it looks like going wrong around 192 hours as a SW/NE tilt develops but the high gathers itself and looks like winning out by the end of the run with cold uppers incoming...
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

Retron
14 January 2026 17:17:40

Daytime max a mere -2C compared to -6C yesterday but would feel fresh enough on Leysdown beach with a 35mph east wind :)

Originally Posted by: Rob K 

I'm still resisting the urge to get excited about this, especially given the timeframes involved, but it's most interesting to see so many of the members/op runs going for an easterly of sorts even if it is a week or more out. That's about as strong a signal as you'll get at this range, and the MetO text forecasts are worth reading too, as they also mention a high to the NE and colder weather towards the end of the month. 

It's been a long time since we had a textbook Scandinavian High that wasn't at the very end of winter, or a transient easterly flow for a day or two as the Azores High ridged NE'wards for a bit. The irony is of course we had a "blink and you'll miss it" Scandinavian High over Christmas, but the (small) upper cold pool ended up going to France instead. In the 80s/90s (and I suspect earlier) these patterns did have a habit of repeating, a "practice run" as my late mum called it - perhaps, just perhaps, we'll see that again this time. 


Leysdown, north Kent
Quantum
14 January 2026 17:23:54

GEM 12Z is on a knife edge - it looks like going wrong around 192 hours as a SW/NE tilt develops but the high gathers itself and looks like winning out by the end of the run with cold uppers incoming...

Originally Posted by: Rob K 

Shows why we need another 24h to firm up.

The warm svalbard bubble ends up not over Scandanavia but absorbed in Ukraine:

https://modeles16.meteociel.fr/modeles/gem/archives/2026011412/gemnh-13-192.png?12 

Note the patch of -26C in Ukraine where it ends up. That's why the GEM appears to go wrong, since it 'drags' the high SEward. The only reason it gathers itself is another svalbard bubble after T+192. In fact a few models show this, that if the initial WAA fails there might be other attempts.


25/26 (850hpa temp) 11 days snow/sleet falling

18/11 (-4) 19/11 (-6) 20/11 (-6) 01/01 (-7) 04/01 (-10) 10/01 (-7) 11/01 (-3) 30/01 (-1) 13/02 (-6) 15/02 (-4) 18/02 (-6)

24/25 10d

18/11 (-6) 19/11 (-6) 23/11 (-2) 22/12 (-5) 04/01 (-5) 05/01 (0)14/02 (0) 15/02 (0)12/03 (-6) 13/03 (-6)

23/24 8d

29/11 (-6) 30/11 (-6) 02/12 (-5) 03/12 (-5) 04/12 (-3) 16/01 (-3) 18/01 (-8)08/02 (-5)

22/23 7d

18/12 (-1)06/03 (-6) 08/03 (-8) 09/03 (-6) 10/03 (-8) 11/03 (-5) 14/03 (-6)

21/22 12d

Brian Gaze
14 January 2026 17:58:29
Very nice. 

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Brian Gaze

Berkhamsted

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Brian Gaze
14 January 2026 17:59:38
GEM is another Kennedy cold spell at t+240.

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Brian Gaze

Berkhamsted

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Brian Gaze
14 January 2026 18:02:35
GEFS 12Z shorts look fairly non-descript. I suppose that fits, with the action likely in the following days.

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Brian Gaze

Berkhamsted

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GroundhogDay
14 January 2026 18:14:20

GEFS 12Z shorts look fairly non-descript. I suppose that fits, with the action likely in the following days.

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Originally Posted by: Brian Gaze 

Yes, it looks to be from the 23rd/24th, assuming we tap in to the cold air.

Brian - Are the GEFS running slow tonight generally or is it just on TWO? 


Based in the snow desert that is North Northants
Ally Pally Snowman
14 January 2026 18:25:19
Brian Gaze
14 January 2026 18:30:18

Yes, it looks to be from the 23rd/24th, assuming we tap in to the cold air.

Brian - Are the GEFS running slow tonight generally or is it just on TWO? 

Originally Posted by: GroundhogDay 

There were some delays on TWO earlier which have cascaded through the day. That said, the GEFS 12Z are just finishing at the moment and don't seem particularly late.


Brian Gaze

Berkhamsted

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CField
14 January 2026 18:34:40
Need ECM to truely get on board with this ...GFS  for norherlies ECM for easterlies
Favourite snowstorm

Famous channel low

Dec 31st 1978

Hastings East Sussex

Foot of level snow severe drifting

Next day max temp -4 degrees Celsius

Hippydave
14 January 2026 18:36:43
Not posted last couple of days as been in the office and less time for chart viewing but there's an element of being on the fence about the possible easterly too😂

I think it's reasonable to have decent confidence in some kind of easterly component to our winds starting in around 7-10 days time, which could range from a couple of days of a chilly south east waft to the early stages of proper cold spell. The ens are still suggesting a lower possibility of more generally unsettled weather if the atlantic has more grunt than the HP, albeit it's not necessarily an either or so much as a wobble between the 2. 

Looking at the ens suites and ECMs op and ens from earlier, I'd tend to go with a cold (uppers) easterly as more likely than milder unsettled weather but much less likely than a fairly bland chilly pattern with an easterly component but things not aligned favourably for more than that. 

I'd be entirely happy though if the 12z ens suites suggest I'm being unduly pessimistic.


Home: Tunbridge Wells

Work: Tonbridge

jhall
14 January 2026 18:37:09
Though the GFS Op is terrific, going by the GEFS 850mb average temperature the ensemble is actually a slight downgrade out in FI compared to what we've been seeing recently.
Cranleigh, Surrey
Chunky Pea
14 January 2026 18:37:40

GEM is another Kennedy cold spell at t+240.

Originally Posted by: Brian Gaze 

May I ask what a 'Kennedy cold spell' is, Brain? It's up there with Beast's 'Murr sausage' in terms of mysterious meanings. 


Patrick,

East Galway, Ireland.

Arbroath 1320
14 January 2026 18:43:44

Need ECM to truely get on board with this ...GFS  for norherlies ECM for easterlies

Originally Posted by: CField 

ECM 12z out to 192 and is massively different from GFS at that time. Atlantic influence. 


Kenmore, Highland Perthshire, GGTTH
marco 79
14 January 2026 18:54:31

May I ask what a 'Kennedy cold spell' is, Brain? It's up there with Beast's 'Murr sausage' in terms of mysterious meanings. 

Originally Posted by: Chunky Pea 

I would assume the Siberian Express stops at Berlin and westward travel is subject to a bus replacement service


Home : Mid Leicestershire ...135m ASL
Brian Gaze
14 January 2026 19:02:24

May I ask what a 'Kennedy cold spell' is, Brain? It's up there with Beast's 'Murr sausage' in terms of mysterious meanings. 

Originally Posted by: Chunky Pea 

"Ich bin ein Berliner"

https://en.wikipedia.org/wiki/Ich_bin_ein_Berliner 


Brian Gaze

Berkhamsted

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Jiries
14 January 2026 19:08:34
12z ensembles for here very good and on track with the cold and hope more members go well below -10C.  Notice Nicosia ensembles which was showing warmer uppers while we get deep cold get 3 members going for -10C a extremely rare sight to get that low so either the Easterly is widespread deep cold that touches the Med or we lose it and the deep cold go to the Med regions? 
some faraway beach
14 January 2026 19:41:58

Oh, yes - the GFS 12z op is a beauty if it's cold you're after. This chart could as well have come from the 80s! Note how Q's bubble eventually leads to the Siberian High being pulled westwards, with a ridge over Scandinavia  (supported by an upper high) *and* a new high forming near Iceland, all of which helps propel that deep cold westwards over us.

https://images.meteociel.fr/im/15/24810/gfseu_0_276cdo0.png 

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Originally Posted by: Retron 

I love that dartboard low over Sicily. 

It's easy to overlook when analysing the various flavours of northern blocking, but they do all need that low pressure in the Med to support them.


2 miles west of Taunton, 32 m asl, where "milder air moving in from the west" becomes SNOWMAGEDDON.

Well, two or three times a decade it does, anyway.

Rob K
14 January 2026 19:45:05

ECM 12z out to 192 and is massively different from GFS at that time. Atlantic influence. 

Originally Posted by: Arbroath 1320 

Looks good enough to me. Can’t complain about the ECM charts tonight even if they are not quite as good as the GFS. 


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

jhall
14 January 2026 20:38:10

Looks good enough to me. Can’t complain about the ECM charts tonight even if they are not quite as good as the GFS. 

Originally Posted by: Rob K 

Yes, the ECM Op gets there eventually, even though it takes it almost to the end of FI to bring in the serious cold. Is that the first time that both GFS and ECM Ops, if not quite singing from the same hymn sheet, are at least both singing hymns? (Perhaps the most appropriate hymn would be "In the Bleak Midwinter".)


Cranleigh, Surrey
jhall
14 January 2026 20:42:53
There's something weird about the ECM ensemble. It claims that at every timestep throughout the whole run the Operation and Control 850mb temperatures are identical! I think the Control run must have been broken.
Cranleigh, Surrey
David M Porter
14 January 2026 21:02:02

Yes, the ECM Op gets there eventually, even though it takes it almost to the end of FI to bring in the serious cold. Is that the first time that both GFS and ECM Ops, if not quite singing from the same hymn sheet, are at least both singing hymns? (Perhaps the most appropriate hymn would be "In the Bleak Midwinter".)

Originally Posted by: jhall 

Would have been very appropriate if we had had some of the current model output three weeks ago. 😁


Lenzie, Glasgow

"A body of men holding themselves accountable to nobody ought not to be trusted by anybody." – Thomas Paine

Brian Gaze
14 January 2026 21:12:40

Yes, it looks to be from the 23rd/24th, assuming we tap in to the cold air.

Brian - Are the GEFS running slow tonight generally or is it just on TWO? 

Originally Posted by: GroundhogDay 

Actually, since my earlier reply there has been an update from NCEP saying there are known problems with GEFS data access which are being investigated.


Brian Gaze

Berkhamsted

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Brian Gaze
14 January 2026 21:14:17
ECM 12Z ENS. Late Jan or the first half of Feb still looks like the time it will happen, if it does.

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Brian Gaze

Berkhamsted

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"I'm not socialist, I know that. I don't believe in sharing my money." - Gary Numan

GroundhogDay
14 January 2026 21:20:05

Actually, since my earlier reply there has been an update from NCEP saying there are known problems with GEFS data access which are being investigated.

Originally Posted by: Brian Gaze 

No problem Brian, cheers for getting back 👍


Based in the snow desert that is North Northants

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