The Weather Outlook

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nsrobins
20 December 2025 15:40:12

ICON 12z first out of the blocks and it paints a completely BONE DRY easterly with not a speck of precipitation wintry or otherwise.

I reckon my house will be safe if the other models follow suit. But at least we can dry out a bit!

Originally Posted by: moomin75 

Safe from what? I take it you don’t like snow or any precipitation for that matter? And ICON is one model (a lesser one IMO) of many so let’s not be too hasty with the quick assumptions! 


Neil

Fareham, Hampshire 28m ASL (near estuary)

Stormchaser, Member TORRO

squish
20 December 2025 15:45:03
ICON is a decent model but not quite on the ECM/UKMO/GFS level.  But it is one option.

The energy left  in the trough off the south coast of Greenland circa +36/48( as the sinking low doesn't spin southwards with as much energy as previously modelled) is the factor that keeps the main centre of the developing block a little further south. Something to watch as the 12z GFS starts to roll


D.E.W on Dartmoor. 300m asl
moomin75
20 December 2025 15:56:46

Safe from what? I take it you don’t like snow or any precipitation for that matter? And ICON is one model (a lesser one IMO) of many so let’s not be too hasty with the quick assumptions! 

Originally Posted by: nsrobins 

Safe from any flooding, safe from me betting my house on not seeing snow on 25th.

But I love snow, would love to be proved wrong, but I fear I won't be!


Witney, Oxfordshire

100m ASL

squish
20 December 2025 16:03:10
UKMO and GFS have everything a bit further south 
D.E.W on Dartmoor. 300m asl
Brian Gaze
20 December 2025 16:05:55
AIGFS has measurable ppt on Christmas Day. I'd be very surprised indeed if all locations record a completely dry day. Part of the problem is down to expectations because a white Christmas only requires a single flake of snow to be observed falling. I know many people don't like that definition but it is the official one.

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Brian Gaze

Berkhamsted

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moomin75
20 December 2025 16:29:14

UKMO and GFS have everything a bit further south 

Originally Posted by: squish 

Yep, everything is going south and we are left in a dry, cold easterly. GFS then has a high sinking over the UK to maintain a dry, settled and chilly period coming up.


Witney, Oxfordshire

100m ASL

doctormog
20 December 2025 16:34:50
I have to say, as much as I am not a fan of such a scenario, the anticyclonic outlook with an easterly influence has been a remarkably consistent outlook for a few days now.

(I’m still hoping for the signals for a potent northerly around the New Year period to strengthen, but that’s a long way off).


moomin75
20 December 2025 16:42:47
The trend is becoming more clear cut now.

A long, dry, cold spell with a UK High.

Finally we can dry out, that as it stands is good news. Shame about the chance of proper winter diminishing run by run, but a lot of people are affected by flooding right now, so the outlook is still good for many.


Witney, Oxfordshire

100m ASL

doctormog
20 December 2025 16:45:13

The trend is becoming more clear cut now.

A long, dry, cold spell with a UK High.

Finally we can dry out, that as it stands is good news. Shame about the chance of proper winter diminishing run by run, but a lot of people are affected by flooding right now, so the outlook is still good for many.

Originally Posted by: moomin75 

It’s not “run by run” as the last couple of runs increased the risk overall. It’s just the 12z op runs so far. Generally it was never ever shown as being really snowy just a risk of a a White Christmas in some southern parts. 


CField
20 December 2025 16:47:57

UserPostedImage

Close but no cigar...Still time for a northward shift...a Brussels express in reverse from two years ago..could turn out to be a great winter down the road but until then the  UKs staggering ability to miss snow events  is still in operation. 


Favourite snowstorm

Famous channel low

Dec 31st 1978

Hastings East Sussex

Foot of level snow severe drifting

Next day max temp -4 degrees Celsius

squish
20 December 2025 16:49:10
GEM 12z is a better run ( longer term) than the 00z, so the finer details will remain elusive until closer range...however the general pattern for a big high near the UK for a week or so is pretty nailed on.
D.E.W on Dartmoor. 300m asl
Retron
20 December 2025 16:53:30
The 12z GEFS control keeps the dream alive for now - it still has the upper cold pool affecting the SE, with fairly widespread snowfall. It seems to be centred on Sheppey! 

https://images.meteociel.fr/im/2/26315/gensfr_0_2_126mek1.png 

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The ensemble mean 850 charts for noon on Christmas Day are a fraction of a degree warmer across much of the UK than the 6z chart, but it's really splitting hairs - there's still quite a wide envelope for the track of that upper low, and it's that upper low which brings the excitement and potential. 

There does seem to be a trend today towards sinking things just that bit further south, but as I said this morning 5 days out is an eternity in modelling terms. The only certainty is that there'll be plenty more to-ing and fro-ing over the next few days!


Leysdown, north Kent
roadrunnerajn
20 December 2025 17:12:38
I’m pretty sure the to-ing and fro-ing will definitely keep us on our toes.. we were forecast for rain here from 11am, drier by 3pm and that was set several days ago. The actual band of very heavy rain arrived at 3pm. The point I am making is that small variations will continue to the eleventh hour.
Germoe, part of the breakaway Celtic Republic. 80m asl
Jiries
20 December 2025 17:52:20

The 12z GEFS control keeps the dream alive for now - it still has the upper cold pool affecting the SE, with fairly widespread snowfall. It seems to be centred on Sheppey! 

https://images.meteociel.fr/im/2/26315/gensfr_0_2_126mek1.png 

UserPostedImage

The ensemble mean 850 charts for noon on Christmas Day are a fraction of a degree warmer across much of the UK than the 6z chart, but it's really splitting hairs - there's still quite a wide envelope for the track of that upper low, and it's that upper low which brings the excitement and potential. 

There does seem to be a trend today towards sinking things just that bit further south, but as I said this morning 5 days out is an eternity in modelling terms. The only certainty is that there'll be plenty more to-ing and fro-ing over the next few days!

Originally Posted by: Retron 

Need the HP to move away north so we can get cold with snow around than this HP that will bring less cold temperatures to average, no frost and no sunshine.  

Bertwhistle
20 December 2025 18:38:07

The trend is becoming more clear cut now.

A long, dry, cold spell with a UK High.

Finally we can dry out, that as it stands is good news. Shame about the chance of proper winter diminishing run by run, but a lot of people are affected by flooding right now, so the outlook is still good for many.

Originally Posted by: moomin75 

Actually it's been up and down rather than down then down a bit more. The GFS ENS earlier today was very cold-promising.

The Christmas Day snow-in-the-south event came after a no-snow forecast, so no-one expected it for certain.

Of course you and I don't know which way the models will trend tomorrow, or the day after, at 5 days out.


Bertie, Itchen Valley.

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

moomin75
20 December 2025 18:48:41

Actually it's been up and down rather than down then down a bit more. The GFS ENS earlier today was very cold-promising.

The Christmas Day snow-in-the-south event came after a no-snow forecast, so no-one expected it for certain.

Of course you and I don't know which way the models will trend tomorrow, or the day after, at 5 days out.

Originally Posted by: Bertwhistle 

Spot on that we don't know which way they will trend. But experience tells me they will continue to trend away from what most of us really want to see.


Witney, Oxfordshire

100m ASL

Brian Gaze
20 December 2025 18:56:18

Spot on that we don't know which way they will trend. But experience tells me they will continue to trend away from what most of us really want to see.

Originally Posted by: moomin75 

It’s worth remembering that there are two facets to the white Christmas angle. One is what snow enthusiasts are hoping for, and the other is what people are betting on. It is the latter that I have primarily been discussing here and elsewhere, because until the last 24 hours or so there was virtually no support for the idea of accumulating snow. 

The actual definition is:

"For the Met Office to declare a ‘white Christmas’, a single snowflake has to be observed falling on the 24 hours of 25 December, by either an official Met Office observer or by a Met Office automated weather station"


Brian Gaze

Berkhamsted

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Rob K
20 December 2025 19:04:20
A rather flabby set of 12Zs it has to be said. The GEFS ensemble scatter seems to be increasing, which is understandable as with a big high pressure and cold air around, a small shift in position can have a big impact on the upper air temperatures. 

Still looks likely to be the coldest Christmas in 15 years, and makes a change from mid-teens!


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

Ally Pally Snowman
Brian Gaze
20 December 2025 19:09:44
Looks like we're getting more agreement between the GEFS and ECM. 

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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

Ally Pally Snowman
20 December 2025 19:15:25
ECM 12z also has a stunner of a Greenland HP.  
Bishop's Stortford 85m ASL.
Bertwhistle
20 December 2025 19:17:43

Spot on that we don't know which way they will trend. But experience tells me they will continue to trend away from what most of us really want to see.

Originally Posted by: moomin75 

Same experience in July?:

Qu: 'I hereby declare, I ...admit I have been far too negative with regards our prospects this month.

I need to learn some valuable lessons here

A great chance for learning from experience.

Followed by:

GEFS isn't great either. Back to my cool and unsettled July idea after a brief warm spell. Ah well. We've had a good ride.

A hot July and the hottest summer on record follows...


Bertie, Itchen Valley.

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

moomin75
20 December 2025 19:25:26

That looks to me like a brief toppler scenario, plus is an age away.

Sadly, this looks a lot like a powder puff colder snap again.


Witney, Oxfordshire

100m ASL

moomin75
20 December 2025 19:28:27

Same experience in July?:

Qu: 'I hereby declare, I ...admit I have been far too negative with regards our prospects this month.

I need to learn some valuable lessons here

A great chance for learning from experience.

Followed by:

GEFS isn't great either. Back to my cool and unsettled July idea after a brief warm spell. Ah well. We've had a good ride.

A hot July and the hottest summer on record follows...

Originally Posted by: Bertwhistle 

Blimey, that's incredibly powerful that you've trawled back that far to find an inaccurate post from me 😅

And incidentally, from my perspective, the summer was actually crap because nearly every one of my cricket games was either washed out or badly rain affected (I'm not even joking!).

I just must live in a gloomy dismal micro climate, hence why people nickname me Gloomin 😅😅


Witney, Oxfordshire

100m ASL

Ally Pally Snowman
20 December 2025 19:35:44

That looks to me like a brief toppler scenario, plus is an age away.

Sadly, this looks a lot like a powder puff colder snap again.

Originally Posted by: moomin75 

Just look at the rest of the run it isn't a toppler. You are on the wind up now Mooms. 


Bishop's Stortford 85m ASL.

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