The Weather Outlook

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Hippydave
Friday, January 3, 2025 9:45:27 AM

Very slight encouraging signs that the period of post-snow rain for this neck of the woods could be briefer than was showing yesterday. Some models actually have it very short.

I just want to keep the covering for the cool-down when the low exits (even if it's just an icy pastiche of proper fluffy snow)

Originally Posted by: Saint Snow 

Trying to decide if I'd rather be in my location or yours 😂- on balance I think yours although at least I know it's going to rain IMBY and any snow will be quickly washed away, you have the possibility of cover remaining and are at the mercy of small adjustments to track and precip intensity. It's the hope that kills ya and all that!

On the plus side if you do end up with a decent cover remaining it's probably going to stick around for a while. 


Home: Tunbridge Wells

Work: Tonbridge

Saint Snow
Friday, January 3, 2025 9:46:34 AM
PS - thanks for the continuing deeper analysis, guys

Martin

Home: St Helens (26m asl) Work: Manchester (75m asl)

A TWO addict since 14/12/01

"How can wealth persuade poverty to use its political freedom to keep wealth in power? Here lies the whole art of Conservative politics."

Aneurin Bevan

Tim A
Friday, January 3, 2025 11:04:55 AM
https://weather.metoffice.gov.uk/warnings-and-advice/uk-warnings#?date=2025-01-03 

Two amber warnings now. 

One for Midlands to account for freezing rain too.

Lots to digest and some high totals possible. 

The northern one has no mention of turning to rain. However I would think rain will get north of the Humber looking at this mornings output, 6z UKMO slightly further North than the 00z.   


Tim

NW Leeds

187m asl

 My PWS 

Retron
Friday, January 3, 2025 11:09:48 AM
As mentioned in the MO thread, this morning's "fax" chart for midnight on Sunday shows a bit of trough disruption as the low moves over the Channel, which has the effect of prolonging snow somewhat. The more disruption the better, if you're in the south!

And as a result of the above, the MetO raw for here has changed from pure rain, to a single sleet symbol yesterday evening, to a single heavy snow symbol first thing this morning, and now to two heavy snow symbols as we're coming up to lunchtime. In other words, the modelling continues to suggest disruption of the low and that can only be good news, especially for those a bit further west. That also delays the arrival of the sultry dewpoints (tucked behind the second warm front on the "fax" chart), meaning a greater chance of seeing snow still on the ground first thing (rather than it being a "check out the window at 1AM" special).

https://www.meteociel.fr/ukmo/fax/fax48.gif?01-18 

(And at the wolf centre, 100 miles due west of here, they're forecast 4 hours of snow, 2 hours of sleet and then some rain. There will almost certainly be some slushy stuff around during the early daylight hours.)


Leysdown, north Kent
Quantum
  • Quantum
  • Advanced Member Topic Starter
Friday, January 3, 2025 11:16:00 AM

First look at the 6Zs.

ICON-D2 6Z looks a bit further south to me on the 0Z. Rapid thaw line seems to be about 50 miles further SW.

I say 'rapid thaw line' rather than rain/snow because its easier to see. The rain/snow line on some models is the same as the rapid thaw line (where temps and dews rise rapidly) but some models have a zone of incongruence where the surface is still cold (no rapid thaw) but snow is not falling due to a thin warm layer. There is a risk of ice pellets or freezing rain in this zone.

I should add there is very little difference between the 6Z and the 3Z (both are an improvement on the 0Z). Maybe the 6Z is 2-5 miles further north (yes its literally a pixel or two further north) but the air is also colder on the northern side so its not really  a downgrade.

Originally Posted by: Quantum 

Given the ICON6Z downgrade can anyone shed any light on this?

Can the ICON downgrade while the ICON-2D upgrades? I would have thought they are driven by the same global model.

What is going on?


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

Tim A
Friday, January 3, 2025 11:24:16 AM
I can only see the 9z Icon 2D Vs 6z Icon main model.  For what it's worth , at 09.00 GMT Sunday, the 9z still has the -4c 850 isotherm over here, whereas it's a bit to the North East on the 6z. 
Tim

NW Leeds

187m asl

 My PWS 

Retron
Friday, January 3, 2025 11:32:52 AM
Super chart from the Harmonie - look how sharp that dividing line is! It's only half the picture, though, as there are pockets of subzero air lower down (and that's what causes all the fun). The chart only shows the broad picture behind that first warm front, and it's the second one which will warm things up markedly as it passes.

https://images.meteociel.fr/im/60/1518/harmoniefrno_37_41ung3.png 

UserPostedImage

https://images.meteociel.fr/im/94/21885/harmoniefrno_19_41igr0.png 

UserPostedImage


Leysdown, north Kent
Rob K
Friday, January 3, 2025 11:33:35 AM
I must say my interest in this event has ticked up a bit - not because there is any chance of decent lasting snow down here, but because there might actually be some rather heavy falling snow for a few hours. So, not the weather I would want, but at least "interesting"!

I have to take my son to a children's party at 5pm tomorrow, looks like I should be able to get home again well before any snow arrives but I will be keeping an eye on it!


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

Quantum
  • Quantum
  • Advanced Member Topic Starter
Friday, January 3, 2025 11:41:14 AM

I can only see the 9z Icon 2D Vs 6z Icon main model.  For what it's worth , at 09.00 GMT Sunday, the 9z still has the -4c 850 isotherm over here, whereas it's a bit to the North East on the 6z. 

Originally Posted by: Tim A 

I'm actually starting to think the ICON6Z-2D wasn't any different substantially to the ICON6Z its just that further south earlier on became further north later on.

We see that with the UKV9Z vs UKV6Z, the former is actually better despite being initially further north, at the improtant moment it pulls off to the east quicker.


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

overland
Friday, January 3, 2025 11:45:33 AM

I must say my interest in this event has ticked up a bit - not because there is any chance of decent lasting snow down here, but because there might actually be some rather heavy falling snow for a few hours. So, not the weather I would want, but at least "interesting"!

I have to take my son to a children's party at 5pm tomorrow, looks like I should be able to get home again well before any snow arrives but I will be keeping an eye on it!

Originally Posted by: Rob K 

Likewise here as there has been no sign of any snow or even sleet in the forecast, but this has slowly changed from a single sleet symbol for an hour to 6 hours of sleet! We are even in the amber warning zone for tomorrow. Whilst I'm still not expecting anything special it is certainly trending the right way.

Edit: just had a closer look and as we are right on the coast we are just outside the amber warning area.


Mumbles, Swansea. 80m asl
Quantum
  • Quantum
  • Advanced Member Topic Starter
Friday, January 3, 2025 11:57:16 AM
No difference in northward or eastward extent on the ICON9Z-2D compared to the 6Z.

Only difference is the 9Z looks slightly heavier.


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

Matty H
Friday, January 3, 2025 12:20:18 PM
Sleet then rain, or just rain on the various apps for here, so not expecting more than a few flakes
Yate, Nr Bristol

TBFTEIARBSC

Essan
Friday, January 3, 2025 12:46:57 PM

Sleet then rain, or just rain on the various apps for here, so not expecting more than a few flakes

Originally Posted by: Matty H 

Just a couple of hours of light snow or sleet here ...... followed by 4 hours of heavy snow (>95%)  😃 


Andy

Evesham, Worcs, Albion - 35m asl

Weather & Earth Science News 

Look in the doubt we've wallowed, look at the leaders we've followed, look at the lies we've swallowed, and I don't want to hear no more

Matty H
Friday, January 3, 2025 12:55:36 PM
https://www.xcweather.co.uk/forecast/Chipping_Sodbury_ 

This says different, but I don’t presume it’s accurate as I’d imagine it’s based on one operational output from a model 


Yate, Nr Bristol

TBFTEIARBSC

Gandalf The White
Friday, January 3, 2025 1:00:58 PM

https://www.xcweather.co.uk/forecast/Chipping_Sodbury_

This says different, but I don’t presume it’s accurate as I’d imagine it’s based on one operational output from a model 

Originally Posted by: Matty H 

It looks much the same?  Maybe 3 hours of heavy snow rather than 4…. after perhaps 5-6 hours of a wintry mix.


Location: South Cambridgeshire

130 metres ASL

52.0N 0.1E



Matty H
Friday, January 3, 2025 1:02:32 PM

It looks much the same?  Maybe 3 hours of heavy snow rather than 4…. after perhaps 5-6 hours of a wintry mix.

Originally Posted by: Gandalf The White 

I meant regarding my previous post about the apps, rather than Andy’s area/post


Yate, Nr Bristol

TBFTEIARBSC

Matty H
Friday, January 3, 2025 1:10:31 PM
Andy’s is actually less, lol, but don’t tell him 🤫 

https://www.xcweather.co.uk/forecast/Evesham 


Yate, Nr Bristol

TBFTEIARBSC

Caz
  • Caz
  • Advanced Member
Friday, January 3, 2025 1:40:02 PM

https://weather.metoffice.gov.uk/warnings-and-advice/uk-warnings#?date=2025-01-03

Two amber warnings now. 

One for Midlands to account for freezing rain too.

Lots to digest and some high totals possible. 

The northern one has no mention of turning to rain. However I would think rain will get north of the Humber looking at this mornings output, 6z UKMO slightly further North than the 00z.   

Originally Posted by: Tim A 

We’ve been upgraded to Amber for snow and ice from tomorrow night into Monday morning.  It’s likely we’ll have a winter wonderland Sunday morning turning to a treacherous ice rink by mid morning, as snow turns to freezing rain.  


Market Warsop, North Nottinghamshire.

Join the fun and banter of the monthly CET competition.

Essan
Friday, January 3, 2025 1:52:50 PM

Andy’s is actually less, lol, but don’t tell him 🤫 

https://www.xcweather.co.uk/forecast/Evesham 

Originally Posted by: Matty H 

I only look at the Met Office 😛   

(Which is usually more conservative when it comes to snowfall here)


Andy

Evesham, Worcs, Albion - 35m asl

Weather & Earth Science News 

Look in the doubt we've wallowed, look at the leaders we've followed, look at the lies we've swallowed, and I don't want to hear no more

Quantum
  • Quantum
  • Advanced Member Topic Starter
Friday, January 3, 2025 2:01:02 PM
ECM6Z has a wider freezing rain risk. MSLP open out to allow temperatures to remain at freezing near the surface while temperatures aloft rise for a band perhaps 30 miles wide.

The snow/rain line and the thaw line are not the same as they usually are. And the ECM6Z is far from the only model to suggest this. Freezing rain risk is significant this weekend.


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

Matty H
Friday, January 3, 2025 2:30:44 PM

ECM6Z has a wider freezing rain risk. MSLP open out to allow temperatures to remain at freezing near the surface while temperatures aloft rise for a band perhaps 30 miles wide.

The snow/rain line and the thaw line are not the same as they usually are. And the ECM6Z is far from the only model to suggest this. Freezing rain risk is significant this weekend.

Originally Posted by: Quantum 

And potentially far more dangerous than the actual snow. I recall (David M Porter Mode) around 1995/1996 we had a freezing rain event here at around this time of year too, it might even have been NYD. It was absolute carnage. Everything coated in mm’s of crystal clear ice and the trees sounded like they were bags of crisps in the breeze


Yate, Nr Bristol

TBFTEIARBSC

Retron
Friday, January 3, 2025 2:38:13 PM

ECM6Z has a wider freezing rain risk. MSLP open out to allow temperatures to remain at freezing near the surface while temperatures aloft rise for a band perhaps 30 miles wide.

The snow/rain line and the thaw line are not the same as they usually are. And the ECM6Z is far from the only model to suggest this. Freezing rain risk is significant this weekend.

Originally Posted by: Quantum 

It's a shame websites handle freezing rain so poorly. Neither xc, the BBC or the Met Office website have a way of displaying it, the only clue you'll get is a prolonged period of rain at 0C (which is unusual IME, normally the temperature rises or it's sleet, soft hail or snow instead).

Given how dangerous it is, you think there would be a better way of signposting it! Mind you, lots of people don't even know what freezing rain is - I remember the blank looks I got at work back in 2018 when I mentioned it being likely, and people seemed to think I was just saying "really cold rain that feels icy when it hits you" rather than "supercooled water which freezes on contact with a surface". Indeed, I've a feeling most people don't realise you can get liquid water below freezing!

This was the view out of the back bedroom window (which was a normal, albeit old, clear window) during the 2018 freezing rain. This will be a scene repeated quite widely on Sunday morning, I suspect!

https://ukwct.org.uk/weather/fzrn.jpg 

UserPostedImage


Leysdown, north Kent
Essan
Friday, January 3, 2025 2:44:56 PM

And potentially far more dangerous than the actual snow. I recall (David M Porter Mode) around 1995/1996 we had a freezing rain event here at around this time of year too, it might even have been NYD. It was absolute carnage. Everything coated in mm’s of crystal clear ice and the trees sounded like they were bags of crisps in the breeze

Originally Posted by: Matty H 

I remember that - was running a pub in Stonehouse at the time.   No-one could get out!  😃    The only serious freezing rain event I've experienced.


Andy

Evesham, Worcs, Albion - 35m asl

Weather & Earth Science News 

Look in the doubt we've wallowed, look at the leaders we've followed, look at the lies we've swallowed, and I don't want to hear no more

Saint Snow
Friday, January 3, 2025 3:05:47 PM

I remember that - was running a pub in Stonehouse at the time.   No-one could get out!  😃    The only serious freezing rain event I've experienced.

Originally Posted by: Essan 

We had one around 2008 or 2009.

Was treacherous underfoot - I found it great fun!!

As a weather event, I liked it, as it was something out of the boring monotony. But I'd prefer the 24-36 hours of snow that the models were showing for here a couple of days ago.


Martin

Home: St Helens (26m asl) Work: Manchester (75m asl)

A TWO addict since 14/12/01

"How can wealth persuade poverty to use its political freedom to keep wealth in power? Here lies the whole art of Conservative politics."

Aneurin Bevan

Tim A
Friday, January 3, 2025 3:14:02 PM
There was a big freezing rain event here in Dec 2018. At the time the Met Office app just showed heavy snow symbols which confused everyone. I think the new configuration just shows heavy rain instead. 
Tim

NW Leeds

187m asl

 My PWS 

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