The Weather Outlook

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Lionel Hutz
22 December 2025 14:59:11

Brian might move this but it’s relevant to short term model accuracy.   The forecast on Saturday night for yesterday was for a little patchy light rain for the east and south-east but we had about three hours of steady, at times heavyish rain.

Trying to guess the fine detail even a day or so out can be a mug’s game.

Originally Posted by: Gandalf The White 

I agree with this. This morning, the consensus seemed to be snow on Christmas day for the Channel Islands. While that may still be the form horse, it wouldn't take very much to shift the snow risk North to Southern England or well to the South of the Channel Islands. If it were a rain forecast, we'd barely comment on that shift but we pay alot more attention to where snow falls.  


Lionel Hutz

Nr.Waterford , S E Ireland

68m ASL



scillydave
22 December 2025 15:09:11

I agree with this. This morning, the consensus seemed to be snow on Christmas day for the Channel Islands. While that may still be the form horse, it wouldn't take very much to shift the snow risk North to Southern England or well to the South of the Channel Islands. If it were a rain forecast, we'd barely comment on that shift but we pay alot more attention to where snow falls.  

Originally Posted by: Lionel Hutz 

Most models currently show the precipitation band grazing the far South West on Christmas day. I wouldn't be surprised to see a few flakes of snow in the air on the high ground in the far Southwest of Cornwall.

A longer shot is that the air mass is cold enough for my old home, the Isles of Scilly to record a white Christmas - that hasn't happened for a long time! Sadly it's more likely to be rain.


Currently living at roughly 65m asl North of Cowbridge in the Vale of Glamorgan.

Formerly of, Birdlip, highest village in the Cotswolds and snow heaven in winter; Hawkinge in Kent - roof of the South downs and Isles of Scilly, paradise in the UK.

Taylor1740
22 December 2025 15:20:43

The latest Met office forecast has been updated…and removed all mention of any wintery precipitation…and confirms what most models and sensible posters on here interpreting them  have been alluding to …in terms of the Christmas weather..I.e coolish, and mainly dry and probably mostly cloudy….so very usable whether especially for those travelling  but for a snow lover like me, very disappointing and frustrating too! 

Originally Posted by: Chichesterweatherfan2 

Yes they've also downgraded it from below average temperatures to average or slightly below average, and are now talking of milder unsettled conditions affecting northern areas in early Jan. They have never mentioned snow or especially cold conditions once in the LRF, therefore I think we can safely say now that any snow to low lying areas is looking extremely unlikely in the next few weeks.


NW Leeds - 150m amsl
Lionel Hutz
22 December 2025 16:06:40

Yes they've also downgraded it from below average temperatures to average or slightly below average, and are now talking of milder unsettled conditions affecting northern areas in early Jan. They have never mentioned snow or especially cold conditions once in the LRF, therefore I think we can safely say now that any snow to low lying areas is looking extremely unlikely in the next few weeks.

Originally Posted by: Taylor1740 

A week is a long time in weather.  


Lionel Hutz

Nr.Waterford , S E Ireland

68m ASL



doctormog
22 December 2025 16:16:26

A week is a long time in weather.  

Originally Posted by: Lionel Hutz 

Agreed. I think Yes Minister would have described such statements as “brave” or “courageous” given the outlook beyond Christmas. He could of course be right but as ever there are no links to models or any analysis once again just a dismissive statement. To phrase an earlier contributor, “same posters, same comments”.

Meanwhile, the output so far on the 12a runs is pretty consistent with the last few sets with the cold pool passing across France rather than southernmost parts. The GFS 12z op run is currently out to day 6 at time of writing and is basically the same as the 06z run at the same point. So a settled spell weather coming up for the Christmas period, but what will be shown beyond then? It would need to be a turnaround from the trend to reflect what was suggested for into the New Year on the Met Office forecast (as the ensembles from previous runs suggested a colder picture was a real risk from the north - of course to be taken with a pinch of salt at that range even if it is a trend).


Gandalf The White
22 December 2025 16:28:05

Agreed. I think Yes Minister would have described such statements as “brave” or “courageous” given the outlook beyond Christmas. He could of course be right but as ever there are no links to models or any analysis once again just a dismissive statement. To phrase an earlier contributor, “same posters, same comments”.

Meanwhile, the output so far on the 12a runs is pretty consistent with the last few sets with the cold pool passing across France rather than southernmost parts. The GFS 12z op run is currently out to day 6 at time of writing and is basically the same as the 06z run at the same point. So a settled spell weather coming up for the Christmas period, but what will be shown beyond then? It would need to be a turnaround from the trend to reflect what was suggested for into the New Year on the Met Office forecast (as the ensembles from previous runs suggested a colder picture was a real risk from the north - of course to be taken with a pinch of salt at that range even if it is a trend).

Originally Posted by: doctormog 

Alternatively, there’s an expression, “You might say that, I couldn’t possibly comment”….

GFS 12z out to Day 8 now and the jet profile is quite different. It looks like more energy in the northern arm again but let’s see.


Location: South Cambridgeshire

130 metres ASL

52.0N 0.1E



Ally Pally Snowman
22 December 2025 16:48:47
The output is getting worse every run now. Ah well.
Bishop's Stortford 85m ASL.
doctormog
22 December 2025 16:55:57

Alternatively, there’s an expression, “You might say that, I couldn’t possibly comment”….

GFS 12z out to Day 8 now and the jet profile is quite different. It looks like more energy in the northern arm again but let’s see.

Originally Posted by: Gandalf The White 

Yes it looks that way in this run. The start of a new trend (or one of the milder options in the ensembles?). The FI section of the GFS op runs seem to have a lack of consistency but that’s nothing new.

It looks as if the anticyclonic period over Christmas is pretty nailed on now.


Hippydave
22 December 2025 17:06:58

The output is getting worse every run now. Ah well.

Originally Posted by: Ally Pally Snowman 

Given just how different the op is starting in the mid term (and not just over the UK, US pattern is different) I'll wait for the ens. 

The 6z had a minority of similar solutions with the majority being much colder, as I would assume did the ECM suite. 

If there's been a big shift towards this being a more likely solution in the ens and it's reinforced by the ECM and continues tomorrow, then  (my) confidence in anything other than the brief colder shot the 12z shows will definitely diminish.

The irritating thing about HP setups can be how different the weather is depending on whether they end up positioned differently and how all of a sudden a change to jet angle/strength can seemingly push them aside. Obviously it's more noticeable at this time of year versus a zonal setup as there's more potential for cold. 


Home: Tunbridge Wells

Work: Tonbridge

Richard K
22 December 2025 17:13:59
At least (might be clutching at straws) there are repeated bursts of warm air advection northwards in the Atlantic which hopefully could encourage further northern blocking.
Saffron Walden, NW Essex, approx 70m above sea level (when the tide is out)
BJBlake
22 December 2025 17:22:40
Is it luck or logic that the GfS in particular - but others too, seem to overcook cold incursions within FI, and consistently downgrade them thereafter. This happened with the Christmas Day cold spell forecast, both in strength and duration. The northerly plunge from last week has been consistently modelled and now it is getting to mid term - 1 week - it starts to modify to a single chilly and dry day before the Atlantic returns. 
Brecklands, South Norfolk 28m ASL
doctormog
22 December 2025 17:28:33

Is it luck or logic that the GfS in particular - but others too, seem to overcook cold incursions within FI, and consistently downgrade them thereafter. This happened with the Christmas Day cold spell forecast, both in strength and duration. The northerly plunge from last week has been consistently modelled and now it is getting to mid term - 1 week - it starts to modify to a single chilly and dry day before the Atlantic returns. 

Originally Posted by: BJBlake 

The northerly plunge was only ever a trend and option in the ensembles from data way in FI, and it still is. If it is still there for the New Year on the charts by the end of the week it will be of more interest. Out to day 9 there has been little change in the ensemble suite (and it’s around that time the cold air was modelled to come in from the north).


Brian Gaze
22 December 2025 17:53:18
The GEFS is showing the SPV strengthening in late December and early January. It felt to me, when I did the winter forecast, that mid-December to mid-January was the most likely time for a proper cold spell this winter. Obviously, that is now looking less likely, but it remains possible.  

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Brian Gaze

Berkhamsted

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Brian Gaze
22 December 2025 17:58:41
Here are all of the GEFS 12Z runs at t+300 hours. I don’t think there has yet been a decisive swing towards a mild scenario, although the trend is in that direction. I wouldn’t be at all surprised to see a few cold deterministic operational runs appearing in the next few days, but until the facts change, I wouldn’t back them as the most likely scenario.

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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

Rob K
22 December 2025 18:23:48
Coldies will be hoping the 12Z GEM is not a trendsetter. The blocked charts of a couple of days ago are starting to look like a distant memory. Euroslug setting up shop for 2026?
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

Gandalf The White
22 December 2025 18:42:48
A quick perusal of the GFS 12z ensemble suite as we hit NYD at 850hPa for my patch gives : 40% above -2c, 30% down at around -8/-10c and 30% in between, in the ‘average’ zone.
Location: South Cambridgeshire

130 metres ASL

52.0N 0.1E



Ally Pally Snowman
22 December 2025 18:48:17
Ensembles from AIFS and GFS still half decent.  We are clinging on.
Bishop's Stortford 85m ASL.
Bertwhistle
22 December 2025 19:07:44

A quick perusal of the GFS 12z ensemble suite as we hit NYD at 850hPa for my patch gives : 40% above -2c, 30% down at around -8/-10c and 30% in between, in the ‘average’ zone.

Originally Posted by: Gandalf The White 

So, clear majority near or below average at this stage. Objective conclusion.


Bertie, Itchen Valley.

Retire while you can still press the 'retire now' button.

fairweather
22 December 2025 19:17:12

And yet....😊

Originally Posted by: Bertwhistle 

....... indeed, along with the rest, live the dream, even though I'm not sure I could walk 10 metres in ice and snow these days!


S.Essex, 42m ASL
fairweather
22 December 2025 19:19:49

Brian might move this but it’s relevant to short term model accuracy.   The forecast on Saturday night for yesterday was for a little patchy light rain for the east and south-east but we had about three hours of steady, at times heavyish rain.

Trying to guess the fine detail even a day or so out can be a mug’s game.

Originally Posted by: Gandalf The White 

Yes, I was surprised at the 5.5mm I got. We are mugs though aren't we? But then it's all part of the annual winter ritual.😀


S.Essex, 42m ASL
nsrobins
22 December 2025 19:32:41

Ensembles from AIFS and GFS still half decent.  We are clinging on.

Originally Posted by: Ally Pally Snowman 

We are, but you get the feeling this might not go the way most of us want it to. Being a nat’s whisker away from the magic of a white Christmas would be ok if we had something to cheer in the run up to New Year, but even that ship is showing hints of creaking and the leaks are appearing. More runs needed?


Neil

Fareham, Hampshire 28m ASL (near estuary)

Stormchaser, Member TORRO

Bolty
22 December 2025 19:58:21
I'm going to say it now that I don't think there will be any retrogression with this, just a very bog-standard winter anticyclonic spell with the high slowly sinking, and the Atlantic returning in the New Year.

The question will be whether it is a gloomy high or a sunny high. Winter high pressure spells are very often plagued with cloud, especially the ones close to the shortest day. Initially with a slight easterly component to the wind, I'd suspect it will be western areas that see the best of any sunshine. Later on, as the high begins to sink, then it will be more likely to be eastern areas.


Scott

Blackrod, Lancashire (4 miles south of Chorley) at 156m asl.

My weather station 

Ally Pally Snowman
22 December 2025 19:59:54

We are, but you get the feeling this might not go the way most of us want it to. Being a nat’s whisker away from the magic of a white Christmas would be ok if we had something to cheer in the run up to New Year, but even that ship is showing hints of creaking and the leaks are appearing. More runs needed?

Originally Posted by: nsrobins 

Sadly I agree, we need a turnaround soon.


Bishop's Stortford 85m ASL.
Chunky Pea
22 December 2025 20:01:05
ec 850 for end of year. very consistant.

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Patrick,

East Galway, Ireland.

CField
22 December 2025 20:03:32
Ecm later run showing another retrogression of a  small pool of cold air bringing heavy snow to East Anlia South East...if this verifies I'm sure it will get shunted south to Brittany again 
Favourite snowstorm

Famous channel low

Dec 31st 1978

Hastings East Sussex

Foot of level snow severe drifting

Next day max temp -4 degrees Celsius

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