The Weather Outlook

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Brian Gaze
28 December 2025 14:19:01
Please stay on topic. I've moved several posts to other threads. 😊
Brian Gaze

Berkhamsted

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

squish
28 December 2025 15:13:43
Early days but iCON 12z looks more favourable in the jet undercutting the block before it sinks 
D.E.W on Dartmoor. 300m asl
doctormog
28 December 2025 15:19:03

Early days but iCON 12z looks more favourable in the jet undercutting the block before it sinks 

Originally Posted by: squish 

Yes, if nothing else it’s an impressive setup at “only” +120 hours:https://www.wetterzentrale.de/maps/ICOOPEU12_120_1.png

UserPostedImage 


squish
28 December 2025 15:37:12
Undercuts further north on this run…BUT loads of cold air in situ . Very snowy run !
D.E.W on Dartmoor. 300m asl
squish
28 December 2025 15:39:00
Correction: potentially very snowy run ‘synoptically’ …not backed up by the raw data from the actual run ! 
D.E.W on Dartmoor. 300m asl
doctormog
28 December 2025 15:42:08

Correction: potentially very snowy run ‘synoptically’ …not backed up by the raw data from the actual run ! 

Originally Posted by: squish 

Yes, the ICON model (on WZ at least) really doesn’t model snow cover/precipitation very well. I have never seen it show any snow for this area before.


squish
28 December 2025 16:03:38
I’ve seen worse charts than the +144 12z UKMO 
D.E.W on Dartmoor. 300m asl
squish
28 December 2025 16:11:15
+144 gfs very much the same…. Delayed cold push for the south …but it’s further west and the high stays in position better ( to my eye ) 


D.E.W on Dartmoor. 300m asl
Brian Gaze
28 December 2025 16:11:27
I don't bother with ICON-G ppt, but ICON-EU models it quite well IME.

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Brian Gaze

Berkhamsted

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Brian Gaze
28 December 2025 16:38:49
Big differences between the GFS and AIGFS at t+180. I wouldn't place a lot of stock in either at this range.

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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

Hungry Tiger
28 December 2025 16:41:55

Tiz my 50th birthday today and looks like the models have decided to give me a birthday gift of super charts.

If these verify, we could be on the cusp of something special, but still early days and I won't be making the mistake of telling friends and family and hope that Brian doesn’t dig out the images of polar bears (those who are veterans of TWO knows what that means 😅😅).

Originally Posted by: moomin75 

🤣🤣🤣🤣🤣🤣🤣🤣


Gavin S. FRmetS.

TWO Moderator.

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South Cambridgeshire. 93 metres or 302.25 feet ASL.



doctormog
28 December 2025 16:42:13
The overall pattern is the same and cold/wintry. I know little to nothing about the AIGFS or its verification, but I have now seen enough from the GFS and its ensemble days, along with the other main models to suspect it is going to get very interesting in places at the end of the coming week.New Year, new weather?

As ever things could change but the timescale is getting into the “reliable” range.


GroundhogDay
28 December 2025 16:47:15
I think I'll bank this latest GFS op run 😄 

It really is a stonker out to 230 hours, with very few places missing out on the white stuff.


Based in the snow desert that is North Northants
ballamar
28 December 2025 17:06:36

The overall pattern is the same and cold/wintry. I know little to nothing about the AIGFS or its verification, but I have now seen enough from the GFS and its ensemble days, along with the other main models to suspect it is going to get very interesting in places at the end of the coming week.New Year, new weather?

As ever things could change but the timescale is getting into the “reliable” range.

Originally Posted by: doctormog 

Do you ever get excited? The charts look possibly the best in many a year and you look to be in a sweet spot. Isn’t that part of the fun the anticipation?

doctormog
28 December 2025 17:17:10

Do you ever get excited? The charts look possibly the best in many a year and you look to be in a sweet spot. Isn’t that part of the fun the anticipation?

Originally Posted by: ballamar 

🤣 I’m usually excited when it starts to snow. 

Yes the charts looks good and the “chase” is part of the fun. As I said we are getting to more reliable time scale now. If the ECM 12z is on the same page later then I would say a cold and wintry conditions from the north look probable and that cold should extend to some extent across much of the country, with details and longevity to be established.


Ally Pally Snowman
28 December 2025 17:19:47
GFS 12z is about as cold a run as you will get, ice days day after day v low night temps. GEM also v cold with plenty of snow.
Bishop's Stortford 85m ASL.
CField
28 December 2025 17:29:04

GFS 12z is about as cold a run as you will get, ice days day after day v low night temps. GEM also v cold with plenty of snow.

Originally Posted by: Ally Pally Snowman 

Run of the winter so far


Favourite snowstorm

Famous channel low

Dec 31st 1978

Hastings East Sussex

Foot of level snow severe drifting

Next day max temp -4 degrees Celsius

Retron
28 December 2025 17:31:16

GFS 12z is about as cold a run as you will get, ice days day after day v low night temps. GEM also v cold with plenty of snow.

Originally Posted by: Ally Pally Snowman 

It's warmer than the 6z here in the next week, believe it or not, with a lovely little warm sector dumping several mm of sleet during Saturday and Sunday. It's typical, of course, as this sort of to-ing and fro-ing always happens - the general pattern remains a cold one and I have to say seeing this reminds me in some ways of the January 2010 cold spell, especially the way a chunk of the polar vortex settles over Scandinavia. 

The most encouraging thing (for cold weather fans) though is the MetO rewriting their mid-term outlook to mention snow. 


Leysdown, north Kent
Rob K
28 December 2025 17:34:11
Yep, -2 max and -10C min in central southern England, old school winter temps!
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

David M Porter
28 December 2025 17:51:49

GFS 12z is about as cold a run as you will get, ice days day after day v low night temps. GEM also v cold with plenty of snow.

Originally Posted by: Ally Pally Snowman 

Indeed Ally, almost reminiscent of the winters at the beginning and end of 2010. 

I could count with the fingers on one hand how many times the models have produced runs like some that we are now seeing in the 15 years since. 


Lenzie, Glasgow

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

Ally Pally Snowman
28 December 2025 18:06:53
AIFS 12z another run with multiple ice days. 
Bishop's Stortford 85m ASL.
westv
28 December 2025 18:19:58
I would be very annoyed if my 2025 winter minimum temp competition guess is reached in 2026. LOL!!
At least it will be mild!
Retron
28 December 2025 18:20:54
Good old MetO - got to love the way it goes overboard with the minima!

UserPostedImage

https://www.theweatheroutlook.com/charts/ukguk/12_162_2m_min_temp.png 

(There's a -25 lurking there...)


Leysdown, north Kent
Hippydave
28 December 2025 18:27:36
Bigger picture wise and it's 'decent' so far today, with I think the main thing being more agreement for colder weather until at least the 7th Jan, a small improvement from 5th Jan which seemed to be a divergence point a day or so back. 

Feet on the ground for me given where I live but for prone spots we're nearly at the getting rather interested point IMO.

UKMO remains a little stubborn on clearing the cold south, which is so far a bit isolated but something to watch if you're in the southern third of the country. Given other output so far though, hopefully it'll fall in line and even if it's right, it's still a nice looking set up. 

So far it all looks very good for a spell of at least 5 days or so of cold weather with snow chances for some but usual caveats about snowfall apply - it's modelled as a convective northerly, so some areas would need to rely on organised troughs, encroaching LPs etc. to bring precip. All too far out to pay much attention to specifics of course and as has been mentioned get the cold in first - my last decent snowfall was in a 'dry' Northerly set up a couple of years ago, with a little LP developing near to the SE and spinning up over MBY and tracking west across parts of the south. That gave around 8-10cm which hung around for 4-5 days from memory. 

Give it another 24-36 hours and I think I'll be happy to go with cold spell incoming and move on to the shorter scale models to check for disturbances etc. Main reason I'm not jumping now being past experiences with model rug pulling and a slight concern that *if* the Greenie HP does come off that runs the risk of the mild/cold boundary ending up north of me if the pattern is too far west and or LP moves up on a NE trajectory and cuts of the cold for MBY.

Potentially fun times incoming!


Home: Tunbridge Wells

Work: Tonbridge

Brian Gaze
28 December 2025 18:32:17
The fascinating thing at this stage of the game is that we still can't be at all confident how this will play out. For all we know, we could be heading for a winter that will be remembered as one of the all time classics, ranking alongside 47, 63 and 79. On the other hand, it's more than feasible that it could amount to several days of cold weather with snow in the favoured locations, and then "spring". It would be difficult to conjure up a more interesting outlook with the limitations of current technology.
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

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