The Weather Outlook

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Crepuscular Ray
28 December 2024 10:27:18

The word ‘blizzard’ tends to be overused, but that looks rather like one in parts of Scotland: 

https://www.wetterzentrale.de/maps/GFSOPUK06_114_1.png 

In isolation I would not read too much into the details at that range but the potential for something disruptive is there over the New Year period.

Originally Posted by: doctormog 

That could be nasty Doc and could even give Edinburgh some blowing snow!


Jerry

Edinburgh, in the frost hollow below Blackford Hill

idj20
28 December 2024 10:30:06

I'd actually be worried. I think there is a very real risk the the extreme north of the mainland and the northern isles (mostly Orkney/Lewis) are at genuine risk of being cut off. These places don't have good infrastructure. And I know they are used to dealing with large amounts of snow but surely not this much over such a short period. It might not be a bad idea for people that live in that top left corner to have some supplies in case the worst case scenario plays out (again not saying it will, the models exaggerate snow amounts; even so though).

Originally Posted by: Quantum 

While us here at Kent look on in envy as we experience yet more rain and in-your-face southerly gales as that low pressure bomb through the UK. Yes, there is something of a seasonal flavour for most of the country once that low pressure tumble onto the North Sea, but those post-low pressure wintry set ups tend to be showery, short lived and marginal in nature for us South Coast gang - and even then have to get through two or three days of wind and rain to get to that. Thus it is of little interest to me as far as my back yard is concerned. When I start seeing a scandi high pulling -16 C uppers under a long fetched north east airflow in 48 hours range then I might raise an eyebrow.

Now I'm starting to sound like Jiries. 😃


Home location: Folkestone Harbour.
Ally Pally Snowman
28 December 2024 10:32:38
Upto day 9 GFS 6z is cold but boring for most.
Bishop's Stortford 85m ASL.
Retron
28 December 2024 10:39:53

While us here at Kent look on in envy as we experience yet more rain and in-your-face southerly gales as that low pressure bomb through the UK. 😃

Originally Posted by: idj20 

Indeed, I've a sinking feeling that we're going to see yet more destructive winds widely across England and perhaps Wales in a few days' time. The 6z GEFS members, for example, have large swathes of 60+ gusts... It's mostly a matter of "how strong" rather than "if". A couple of random 6z GEFS members as an example. (The high res GEFS charts on MC don't cover the whole of the UK, sadly).

https://images.meteociel.fr/im/88/13801/gensfr_3_8_114xjx6.png 

UserPostedImage

https://images.meteociel.fr/im/90/4635/gensfr_8_8_108zzu9.png 

UserPostedImage


Leysdown, north Kent
Retron
28 December 2024 10:49:16
Having dug through the rest of the GEFS members, thankfully there's still a great variety of options regarding the windstorm - some members even have a ridge over the UK instead at just 4 and a half days out! And then there's this - some cheer for us in the SE, pretty much an ideal snowfall chart! If only, eh? 😁

https://images.meteociel.fr/im/59/19989/gensfr_24_2_114kmb3.png 

UserPostedImage


Leysdown, north Kent
doctormog
28 December 2024 10:53:36

Having dug through the rest of the GEFS members, thankfully there's still a great variety of options regarding the windstorm - some members even have a ridge over the UK instead at just 4 and a half days out! And then there's this - some cheer for us in the SE, pretty much an ideal snowfall chart! If only, eh? 😁

https://images.meteociel.fr/im/59/19989/gensfr_24_2_114kmb3.png 

UserPostedImage

Originally Posted by: Retron 

Can you imagine the chaos that would cause!

The 06z GFS op meanwhile is going for a very anticyclonic (and chilly) medium term.


tallyho_83
28 December 2024 11:28:15

Can you imagine the chaos that would cause!

The 06z GFS op meanwhile is going for a very anticyclonic (and chilly) medium term.

Originally Posted by: doctormog 

Gfs 06z Operational shows colder than average weather up until 12th and maxes of +2s and +3s widely. He control plunges Europe into the freezer we are colder than average still. We shall see. Interesting strat developments too.


Home Location - Vixen Tor Close, Okehampton, Devon (221m ASL)

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Sean Moon

Magical Moon

www.magical-moon.com

Hippydave
28 December 2024 11:34:05
1st January really could be an 'interesting' day of weather. Just going by the UKV charts you get snowfall accumulations by the 2nd of:-

UserPostedImage

The most notable fall being on the 1st with this snapshot (Northern Scotland gets most of it's snow from the preceding LPs):-

UserPostedImage

With some damaging winds around too (and for the Western Isles on 31/12):-

UserPostedImage

I imagine the snowfall picture will be different come the day but given recent form I wouldn't bet against a significant wind event. I guess that does all depend on the modelling of the jet and how it develops the LP so there's plenty of time still for things to change and the LP not to deepen so explosively. 

In terms of the bigger picture and it still looks like a colder spell is favoured, even IMBY, although there's enough dissenting members particularly on southern ens set to make a collapse to mild after a couple of cold days a possible albeit currently much less likely scenario. HP looks to be generally close to the UK after the above LP/LPs finish with us, so I'd imagine it would be fairly dry for many, away from prone areas. 

It's not the worst model watching at the moment, albeit I'd imagine most would be happy to see the models move away from phasing the LP with the jet to bring about the above outcome from a wind POV. 


Home: Tunbridge Wells

Work: Tonbridge

The Beast from the East
28 December 2024 11:56:03

Upto day 9 GFS 6z is cold but boring for most.

Originally Posted by: Ally Pally Snowman 

Worrying trend for the high to sink and all the good stuff heading for Greece as is usual in the modern winter


Purley, Surrey, 70m ASL

"We have some alternative facts for you"

Kelly-Ann Conway - former special adviser to the President

White Meadows
28 December 2024 11:59:07
Not sure why so much despondency this morning. The general outlook for coldies looks really good IMO

…take the 06 ensembles in isolation and it’s a much colder picture than usual for early January. 

The Beast from the East
28 December 2024 12:00:39

Indeed, I've a sinking feeling that we're going to see yet more destructive winds widely across England and perhaps Wales in a few days' time. 

https://images.meteociel.fr/im/90/4635/gensfr_8_8_108zzu9.png 

UserPostedImage

Originally Posted by: Retron 

It looks like a hurricane. Lets hope this is wrong

https://modeles16.meteociel.fr/modeles/gens/runs/2024122806/gens-8-1-108.png 


Purley, Surrey, 70m ASL

"We have some alternative facts for you"

Kelly-Ann Conway - former special adviser to the President

CField
28 December 2024 12:07:29
Lots to happen before then...but Atlantic never really breaks through and that very cold air to the east needs closely monitoring 330+ hrs out....
Favourite snowstorm

Famous channel low

Dec 31st 1978

Hastings East Sussex

Foot of level snow severe drifting

Next day max temp -4 degrees Celsius

ballamar
28 December 2024 12:12:14
Possibly the most interesting event to watch with the potential severe impacts shifting run by run. Who would be a forecaster?!! 

28 December 2024 12:28:29
Chances of a frost in southern England in mid winter increasing. As for snow, maybe, I always went for January cold snap in what will still be a record mild winter I fear.
Berkshire
tallyho_83
28 December 2024 12:35:15

Chances of a frost in southern England in mid winter increasing. As for snow, maybe, I always went for January cold snap in what will still be a record mild winter I fear.

Originally Posted by: The Dub Version 

Not one ground or airfrost so far this December...it's incredible.  Wow.


Home Location - Vixen Tor Close, Okehampton, Devon (221m ASL)

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Sean Moon

Magical Moon

www.magical-moon.com

Taylor1740
28 December 2024 12:57:28

Not one ground or airfrost so far this December...it's incredible.  Wow.

Originally Posted by: tallyho_83 

Same here, Incredible really and my expectations of the possible upcoming cold spell are very low, probably be max temps of 2-3c and a few frosts at night with no snow as that's what all cold snaps seem to deliver these days.


NW Leeds - 150m amsl
Retron
28 December 2024 13:08:03

Same here, Incredible really and my expectations of the possible upcoming cold spell are very low, probably be max temps of 2-3c and a few frosts at night with no snow as that's what all cold snaps seem to deliver these days.

Originally Posted by: Taylor1740 

Hmm, the last frostless December here was the infamous 2015, the absolute low was 1.0. It's currently running at 1.1 this month - but with the unexpectedly cold day today, will that be beaten tonight? There's a decent chance, I'd guess, as the models are showing it to be 4C (MetO) or 6C (GFS) right now, but it's only 2.2... and that *is* cold for late December here.


Leysdown, north Kent
Jiries
28 December 2024 13:31:56

While us here at Kent look on in envy as we experience yet more rain and in-your-face southerly gales as that low pressure bomb through the UK. Yes, there is something of a seasonal flavour for most of the country once that low pressure tumble onto the North Sea, but those post-low pressure wintry set ups tend to be showery, short lived and marginal in nature for us South Coast gang - and even then have to get through two or three days of wind and rain to get to that. Thus it is of little interest to me as far as my back yard is concerned. When I start seeing a scandi high pulling -16 C uppers under a long fetched north east airflow in 48 hours range then I might raise an eyebrow.

Now I'm starting to sound like Jiries. 😃

Originally Posted by: idj20 

 Nothing wrong with it as you live there pay council tax rent or mortgage then too right to focus on on your area.  

Tim A
28 December 2024 13:33:47
No frosts here in December either, low 0.3c during a heavy snow shower that left a wet covering last Sunday. 
Tim

NW Leeds

187m asl

 My PWS 

DEW
  • DEW
  • Advanced Member
28 December 2024 13:36:43

't there in the 00z. Honest"latest GFS blows up the storm into something very nasty. 

https://modeles16.meteociel.fr/modeles/gfs/runs/2024122806/gfs-0-108.png?6 

Originally Posted by: The Beast from the East 

That wasn't there in the 00z. Honest! 

(But it was there in  yesterday's 00z - just another tiny flip and back again)


War is God's way of teaching Americans geography - Ambrose Bierce

Chichester 12m asl

Retron
28 December 2024 13:47:52
Here's an interesting animation - it's the latter half of the 6z GEFS, showing 850 anomalies. You can easily see why the cold is shown to be prolonged - there are several warm blasts headed over Greenland, the normal Atlantic warmth being deflected away to our west by the cold blocking high over us. It's this sort of repeated warm air advection, albeit deflected even further west, which tends to give us a cold spell rather than a cold snap.

https://images.meteociel.fr/im/2/29682/animfjs4.gif 

UserPostedImage


Leysdown, north Kent
Chunky Pea
28 December 2024 14:26:25
One for Retron. 'Control' vs EC temp anomaly at 90hrs. The reason I can't go beyond this is that for some reason, the control run cannot run into the new year. Possible an issue with overlap or something. I've noticed something like this on the WZ graphs as well in that they can't show some 850hpa temp averages beyond the new year.

It is interesting how both charts (2m temp anoms) are basically showing the same pattern broadly speaking. 

EC:

UserPostedImage

Control:

UserPostedImage


Patrick,

East Galway, Ireland.

Retron
28 December 2024 14:34:29

One for Retron. 'Control' vs EC temp anomaly at 90hrs. The reason I can't go beyond this is that for some reason, the control run cannot run into the new year. Possible an issue with overlap or something. I've noticed something like this on the WZ graphs as well in that they can't show some 850hpa temp averages beyond the new year.

It is interesting how both charts (2m temp anoms) are basically showing the same pattern broadly speaking.

Originally Posted by: Chunky Pea 

To be fair, you'd expect them to be much the same at only T+90 - it's a shame that site doesn't go beyond that! (There's no excuse really for it in this day and age either, but as you say you do see similar effects on other sites - WZ has been doing it for decades.)

T'other thing that stands out is the sheer warmth over and east of Hudson Bay. This morning's 0z ECM had 22C positive anomalies there around the same time (at 850), the whole airmass is just ridiculously warm.


Leysdown, north Kent
nsrobins
28 December 2024 15:20:28
12Z ICON trends the NYD low a bit shallower and south. 

Chances of a snow event central areas increasing. 


Neil

Fareham, Hampshire 28m ASL (near estuary)

Stormchaser, Member TORRO

Zubzero
28 December 2024 15:40:45

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