The Weather Outlook

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28 November 2024 09:24:50

Just going purely on the 00Z surface charts, the first half of December looks like a rollercoaster ride of deep Lows and Ridges. A few cold shots from the NW and a few mild wafts from the SW.

Could be worse......could be better šŸ¤”

Originally Posted by: Crepuscular Ray 

I said that yesterday , flat as a pancake with outside chances of a paltry northerly puff, but was deleted.

It wasn't as though I wasn't commenting on the models?


Berkshire
warrenb
28 November 2024 09:36:17

I said that yesterday , flat as a pancake with outside chances of a paltry northerly puff, but was deleted.

It wasn't as though I wasn't commenting on the models?

Originally Posted by: The Dub Version 

Well I am clearly missing something unless your analysis is based on one operational run from one model. Looks interesting when all models taken into consideration. High pressure never far from the scene, and all depends on placement and orientation.

So looks more like a waffle than a pancake, as far more ridges than flat


Gandalf The White
28 November 2024 09:52:09

I said that yesterday , flat as a pancake with outside chances of a paltry northerly puff, but was deleted.

It wasn't as though I wasn't commenting on the models?

Originally Posted by: The Dub Version 

Maybe it was deleted because it was patently not an observation based on the totality of the model output, but on your preference for a rather unsubtle form of trolling? Ā šŸ¤”šŸ™„


Location: South Cambridgeshire

130 metres ASL

52.0N 0.1E



Brian Gaze
28 November 2024 09:53:49

I said that yesterday , flat as a pancake with outside chances of a paltry northerly puff, but was deleted.

It wasn't as though I wasn't commenting on the models?

Originally Posted by: The Dub Version 

You didn't reference any model output and made a sweeping one liner which wasn't an objective summary. So your comment at best was posted in the wrong thread / forum or shouldn't have been posted at all. Therefore, I'll try asking you politely: please stay on topic and if you've got nothing to contribute at a given moment, don't post. Now please move onĀ 


Brian Gaze

Berkhamsted

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Russwirral
28 November 2024 12:05:56
Not much in the offing these past few days model wise... however scratch beneath the surface and theres defo seeds of potential

Pressure falling over the Med, usually is a sign that things are either turning colder and settled around the UK, or perhaps HP beginning to setup for some blocking.

EDIT: GDPS looks pretty decent only just checked

UserPostedImage


Russwirral
28 November 2024 19:07:27
EcmĀ  hints that we might be sleepwalking into a wintry spell ....Ā 
Saint Snow
28 November 2024 20:24:54

EcmĀ  hints that we might be sleepwalking into a wintry spell ....Ā 

Originally Posted by: Russwirral 

Any chance you could elaborate?

What I'm seeing in FI is that high stretching between the Azores and Iberia/Western France being likely to deflect the big low exiting the US over the north of the UK, flattening that little bubble of high pressure that's ridged northwards from the AH.

I'd love to be educated here (genuinely šŸ‘) how I'm wrong.

Edit: GEM does look much more promising at +240

Edit 2: GFS shows just how it easily a promising synoptic can turn to mush, with high pressure in an increasingly good place then being toppled (caveat being that GFS runs often show a toppling scenario, then showing a 'Carlsberg' the next run)


Martin

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Brian Gaze
28 November 2024 21:31:17
The extended part of the ECM looks very interesting tonight.

https://www.theweatheroutlook.com/twodata/ecmhr.aspx?run=12&charthour=246&chartname=gh_na&chartregion=uk-region&charttag=500hPa%20/%20MSLP 


Brian Gaze

Berkhamsted

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The Beast from the East
29 November 2024 01:31:09

The extended part of the ECM looks very interesting tonight.

https://www.theweatheroutlook.com/twodata/ecmhr.aspx?run=12&charthour=246&chartname=gh_na&chartregion=uk-region&charttag=500hPa%20/%20MSLP 

Originally Posted by: Brian Gaze 

I suspect another false dawn. This feels like the last few winters are repeating themselves. Early cold spell and everyone gets excited, that hope slowly fades away as the weeks pass. Eventually its spring.Ā 


Purley, Surrey, 70m ASL

"We have some alternative facts for you"

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Heavy Weather 2013
29 November 2024 06:30:45
I feel the 8th December feels like a nice little marker in the sand.

GFS 12z ensembles showed this well yesterday. Looked a bit of a mess on the 18z. But feels like the 0z has a bit more clustering around that time again.

It’s a potential signal at least for us to focus on.Ā 


Mark

Beckton, E London

Less than 500m from the end of London City Airport runway.

DEW
  • DEW
  • Advanced Member
29 November 2024 08:41:09
WX charts show temp profiles for W Europe much as yesterday : W Europe near norm, and countries further east well above though below freezing in absolute terms. In week 2 the cold air in the east firms up but only makes moderate progress westwards though the freezing areas over mountainous areas (Alps, Carpathians) expand. Pptn map has altered: for week 1 the activity remains along Atlantic coasts and in Greece but a new outlook in week 2, some rain but not specially heavy across N Britain to the S Baltic, plus some heavy rain through the Mediterranean; not much now shown for S Britain and France.

GFS Op 0z - Today's HP slipping E into C Europe allowing troughs to move E-wards across Britain, a weak one Mon 2nd and deeper on Thu 5th, the latter with gales for all, weak again on Sat/Sun 7th/8th. Then HP comes in from the SW 1045mb Ireland, retreating by Sun 15th as LP over Scandinavia brings in some potentially cold NW-lies.Ā 

ECM - like GFS but the trough Thu 5th only really affects Scotland and then that for the 7th/8th compensates by being deeper and further S 990mb Irish Sea

GEM - closer to ECM but pressure generally higher, effectively zonal around Thu 5th

GEFS - mild and mostly dry until Mon 2nd, dipping cold for a couple of days and then becoming wetter as temps recover to above norm until Sun 7th. Then many ens members cluster well below norm (esp in S) until end of run, but with enough staying higher (notably poor agreement in the N) that the mean is only a little on the cool side.


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

Chichester 12m asl

UncleAlbert
29 November 2024 09:46:51
Later part of the 00Z GFS well above the main pack which probably averages around -5C at that stage.Ā  Looking at Aberdeen,Ā  the average of the whole suite is only about 1C lower than that of southern England at that stage, which seems strange for a mobile westerly with brief cold shots?
Heavy Weather 2013
29 November 2024 10:31:23
06z 08 December

HTTPS://www.wetterzentrale.de/maps/GFSOPEU06_219_1.png 

Lovely.


Mark

Beckton, E London

Less than 500m from the end of London City Airport runway.

Heavy Weather 2013
29 November 2024 10:54:41
My goodness the 06z really is lovely.Ā 
Mark

Beckton, E London

Less than 500m from the end of London City Airport runway.

Taylor1740
29 November 2024 10:57:00
GFS 6z back to showing a Northerly plunge, if that comes off then we will have had some kind of a cold snap from the North every month since September now. Seems like the pattern has become primed for Northerlies recently. Would be nice to see an Easterly though in Jan or Feb.
NW Leeds - 150m amsl
Tim A
29 November 2024 11:13:57
Would need some upgrades for here,Ā  but a chanceĀ  snow on Tuesday for some particularly Scotland.Ā 

https://www.wetterzentrale.de/maps/GFSOPUK06_102_53.png 


Tim

NW Leeds

187m asl

Ā My PWS 

Brian Gaze
29 November 2024 11:33:48
I suspect a lot of people here would be happy with the GFS 06Z evolution. The ensembles have been showing some interest too.

UserPostedImage


Brian Gaze

Berkhamsted

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Brian Gaze
29 November 2024 11:34:43

GFS 6z back to showing a Northerly plunge, if that comes off then we will have had some kind of a cold snap from the North every month since September now. Seems like the pattern has become primed for Northerlies recently. Would be nice to see an Easterly though in Jan or Feb.

Originally Posted by: Taylor1740 

It also appears (I've not got evidence to back this assertion) the northerlies have been more potent than in most recent years.


Brian Gaze

Berkhamsted

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idj20
29 November 2024 12:02:46

It also appears (I've not got evidence to back this assertion) the northerlies have been more potent than in most recent years.

Originally Posted by: Brian Gaze 

Certainly not the case for the southern half of the UK. It's true that northerlies do deliver wintry weather to Scotland and perhaps high ground over the rest of the UK during the Winter month, but they really have lost their punch at this end as they have become much more diluted or watered down. I seriously cannot remember the last time a northerly airflow brought squally snow to Kent (I think it was 2005).Ā 


Home location: Folkestone Harbour.
Gandalf The White
29 November 2024 12:34:21

It also appears (I've not got evidence to back this assertion) the northerlies have been more potent than in most recent years.

Originally Posted by: Brian Gaze 

I don’t think you can argue against the evidence that warming oceans must ameliorate the surface cold, nor that the Arctic is less cold than it used to be. Ā If potency reflects the increased moisture content and potential instability of higher SSTs then yes, perhaps.


Location: South Cambridgeshire

130 metres ASL

52.0N 0.1E



Gandalf The White
29 November 2024 12:43:16

I suspect a lot of people here would be happy with the GFS 06Z evolution. The ensembles have been showing some interest too.

Originally Posted by: Brian Gaze 

The 06z ensemble suite shows an unusually strong signal for a northerly flow at the 850hPa level from Sunday 8th: it looks like a switch is thrown next weekend as we swing from westerlies to northerlies. This is also reflected in the 2m temperature trend, with the mean maxima for here setting around 5c.


Location: South Cambridgeshire

130 metres ASL

52.0N 0.1E



CField
29 November 2024 13:23:03
A lot of unstable very cold Baltic air starting to appear at the end of the model outputs....increases the chance of a wind reversal...a decent easterly for Xmas ?
Favourite snowstorm

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Hastings East Sussex

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Next day max temp -4 degrees Celsius

Taylor1740
29 November 2024 13:27:29

It also appears (I've not got evidence to back this assertion) the northerlies have been more potent than in most recent years.

Originally Posted by: Brian Gaze 

Yes agreed, not just this year but the last couple of years actually it feels like the Northerlies have been colder and clearer than I would expect. Not sure why this is but there has been a lot of very cold weather in Iceland in recent Winters.


NW Leeds - 150m amsl
UncleAlbert
29 November 2024 14:25:47

Yes agreed, not just this year but the last couple of years actually it feels like the Northerlies have been colder and clearer than I would expect. Not sure why this is but there has been a lot of very cold weather in Iceland in recent Winters.

Originally Posted by: Taylor1740 

The late 60s were like thatĀ  (e.g. early Dec 67)Ā  but sadly much less potent these days with the exception of 2010.

DEW
  • DEW
  • Advanced Member
29 November 2024 14:33:34

It also appears (I've not got evidence to back this assertion) the northerlies have been more potent than in most recent years.

Originally Posted by: Brian Gaze 

From chart watching, I'd say the northerlies last year were extremely potent - but were mostly limited to the other side of the North Sea, with a semi-permanent deep low somewhere in the Baltic continually feeding Arctic air into Norway and Sweden. Britain narrowly missed out, only an occasional storm from that direction.

There used to be an assumption, justified in most years, that a Scandinavian High was a normal winter feature, and Britain would eventually get a taste of this via easterlies. But not last year and although it's rather early to be detecting winter patterns, the same sort ofĀ  Scandinavian LP has been prominent this year.


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

Chichester 12m asl

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