The Weather Outlook

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Gavin D
18 November 2018 09:28:03

Some cold looking runs in the 18z longer-term.  These are for London.

 

Diagramme GEFS

Originally Posted by: Karl Guille 

 

Doesn't look as cold this morning

00z

208309430_graphe3_1000___-0.12574_51.5085_Londres(1).thumb.gif.a7820a4c969a930c27354425d6a2b22f.gif

Gavin D
18 November 2018 10:37:12

06z GFS is building pressure over Spain which in turn is forcing the low in the Atlantic further north 

06z

gfs-0-210.thumb.png.5eb4e42a5a1ea93d3cfe12a695fdb6ac.png

00z

gfs-0-216.thumb.png.29b0b2a167e48e3e5b095e0b634400e6.png

Retron
18 November 2018 13:11:46

Agreed, you mentioned this last year.

What’s also handy is the time stamp.

 

Maximum:

42 °F

90% Percentile:

41 °F

Minimum:

36 °F

10% Percentile:

39 °F

Am I right in assuming the 90% percentile means 90% of its total members?.

 

Originally Posted by: Polar Low 

Yup - in this case, 10% of the members have a high above 41F and 10% have a low below 39F.

You can switch to Celsius by clicking the little cog icon btw.


Leysdown, north Kent
Gavin D
18 November 2018 13:50:28

After the cold snap it looks like temps recover by the end of the week longer term more milder runs seem to be appearing with the mean not dropping all that low

JACKO4EVER
18 November 2018 14:07:47

After the cold snap it looks like temps recover by the end of the week longer term more milder runs seem to be apperaing with the mean not dropping all that low

Originally Posted by: Gavin D 

yes quite tight bunching out to the 25th then the usual scatter, but some noticeable milder options now in FI

doctormog
18 November 2018 14:26:47
Up north it is a slightly different picture (compared with average) with a cooler regime having a slightly higher probability. This would tie in with some of the more “northerly” output and Met Office forecasts.

http://www.meteociel.fr/cartes_obs/gens_display.php?ext=1&lat=57.2&lon=-2.3 


Gavin D
18 November 2018 15:30:26

ICON 12z similar to GFS we need to look towards Spain where pressure is building which is forcing the low/s in the Atlantic north 

icon-0-144.thumb.png.89b7df91049acf78e05a44c5d6a5fe0f.pngicon-0-168.thumb.png.2a113e1a1c18b7b1d6788ad446e60c5c.pngicon-0-180.thumb.png.4507b836422e32b3ad7dbfd45f273c20.png

It certainly wouldn't be really mild but at the same time never getting really cold

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Gooner
18 November 2018 16:22:58

Modele UKMO - Carte prévisions

Decent 144 from UKMO


Remember anything after T120 is really Just For Fun



Marcus

Banbury

North Oxfordshire

378 feet A S L



doctormog
18 November 2018 16:53:35

Looking at the messy synoptics on the 12z GFS op run I would expect a lot of scatter in the ensemble data after the first five or six days (again).


Heavy Weather 2013
18 November 2018 16:59:10

Looking at the messy synoptics on the 12z GFS op run I would expect a lot of scatter in the ensemble data after the first five or six days (again).

Originally Posted by: doctormog 

Yes. I do get the feeling that what we are seeing isn’t quite normal. It’s one of those situations that could switch dramatically. 

 


Mark

Beckton, E London

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

Gavin D
18 November 2018 17:47:03

That low to the west of Ireland is much deeper and closer on tonights GFS P compared to the 06z

12z

gfs-0-228.thumb.png.de9013996e4acc322ff5954240013adb.png

06z

gfs-0-234.png

Brian Gaze
18 November 2018 17:54:53

Plenty of interest IMO. I'd not be at all surprised to see a major snow event in the next 3 weeks, obviously more likely in the northern half of the UK.


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

Gavin D
18 November 2018 19:59:59

Not often you see the ECM Op and mean so close through-out on the 850's

graphe_ens3.thumb.png.469b25a0e564142ce8c1d975eeb7498c.png

Hippydave
18 November 2018 20:02:47
Fair bit of disagreement in FI around how the Atlantic behaves. GFS ens are split with a better clustering of chillier runs, although a lot of milder stuff too.

If GFS is, as it tends to, overplaying LP development I'd expect it to move back from the LP pushing milder air over the country (although Scotland has been on the cooler side of the boundary for most of the GFS runs recently).

More runs needed and all that.


Home: Tunbridge Wells

Work: Tonbridge

picturesareme
18 November 2018 20:31:57
Regardless of what the charts are saying 9/10 days away the coming week is almost bog standard late November temperature wise. The only exception being Tuesday.

UserPostedImage 

Whether Idle
18 November 2018 21:11:03

Regardless of what the charts are saying 9/10 days away the coming week is almost bog standard late November temperature wise. The only exception being Tuesday.

UserPostedImage

Originally Posted by: picturesareme 

Yes the much hyped "cold spell" has taken a severe watering down in the last week, and is now an enfeebled cool snap.


Dover, 5m asl. Half a mile from the south coast.
Hippydave
18 November 2018 22:21:05

 

Yes the much hyped "cold spell" has taken a severe watering down in the last week, and is now an enfeebled cool snap.

Originally Posted by: Whether Idle 

Depends on whether you were looking at the models or listening to the hype I guess

The initial easterly was only ever going to bring chilly weather relative to the time of year and cold in comparison to the mildness of the last couple of weeks. (I'd happily bet that the CET for the next 4-5 days will be in the chilly category, relative to average. One set of computer forecasts for a warm location on the south coast doesn't change that)

The potential for 'cold' weather was always shown as being after the initial cool easterly. It's still arguably after that, but has reduced from being a real possibility to something of an outsider.

IMO often chilly with some milder interludes is now the most likely outcome with the balance of chilly to mild tilted depending on where in the country you are. Further North more chilly than mild, down south more chance of milder being a bit more dominant although that really depends on how strong the Atlantic is versus what looks like fairly weak Northern blocking. 


Home: Tunbridge Wells

Work: Tonbridge

tallyho_83
19 November 2018 00:06:21

Why NO ISO BAR AT +111 ON 18Z GFF OP RUN?


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

---------------------------------------

Sean Moon

Magical Moon

www.magical-moon.com

Brian Gaze
19 November 2018 06:38:42

Why NO ISO BAR AT +111 ON 18Z GFF OP RUN?

Originally Posted by: tallyho_83 

There was.


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
19 November 2018 06:48:46

Pretty Meh output this morning certainly compared to a few days ago. No significant cold in November now looks a safe bet.


Bishop's Stortford 85m ASL.
roadrunnerajn
19 November 2018 07:01:03
All very ordinary and a typical output for late November. As some have already said the models are jumping all over the place in FI so we could get anything though the winter.... Cold will come but not just yet..
Germoe, part of the breakaway Celtic Republic. 80m asl
nsrobins
19 November 2018 07:20:55
I’ve seen enough output over the last few years to keep stoically to the mantra that the likelihood of a particular outcome (at 144 as a guide) increases exponentially when their is cross-model agreement. To that end it looks a decent call by the big three for a stretchy trough over or just south of the UK with a cool drift from the east this time next week, with a period of ‘blandish’ weather between.

After that opinion differs but the idea of either a potent Northerly or a new Scandy High is just that - an idea - with the GEFS especially shifting away again from colder options. Indeed we’re just as likely to get very mild southerlies as freezing NElys longer term.


Neil

Fareham, Hampshire 28m ASL (near estuary)

Stormchaser, Member TORRO

Maunder Minimum
19 November 2018 07:27:23

All very ordinary and a typical output for late November. As some have already said the models are jumping all over the place in FI so we could get anything though the winter.... Cold will come but not just yet..

Originally Posted by: roadrunnerajn 

I would not call it "ordinary" the hemispheric pattern is extremely unusual with the PV shredded and HP cells popping up in unexpected places.

What is ordinary, is that whatever happens, the UK weather appears reluctant to give us some extraordinary weather arising out of that *unless it becomes extraordinarily mild of course, with long fetch southerlies.


New world order coming.
roadrunnerajn
19 November 2018 07:54:40
That's sort of what I meant...

Typical to the UK, nothing extreme


Germoe, part of the breakaway Celtic Republic. 80m asl
Gavin D
19 November 2018 08:04:15

Following on from last nights 12z the 00z ECM op and mean are very close again for the 850's through-out

graphe_ens3.thumb.png.5f44cb60f3685c54f9312685d9ab3350.png

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