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Heavy Weather 2013
25 November 2019 21:16:04
I’m happy. Yes we unlikely to see snow. But it’s always great to get to have some seasonal in December.

Mark
Beckton, E London
Less than 500m from the end of London City Airport runway.
doctormog
25 November 2019 21:24:37


 


After the rains on the 27/28th November its possible we could enjoy a completely dry week down here. 


Its been a while since that's occured.


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Chilly for a number of days too with maxes circa 5c (41f) in London.


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Originally Posted by: Gusty 


Forgetting any wintriness (or lack thereof) I suspect the above scenarios would be very welcome for many people. Bright, dry and fresh.


White Meadows
25 November 2019 21:49:04


A 4 to 5 day event doesn't fit in with the Met O forecast at all. Their current update talks about the cold breaking down after 10/12 and wintry showers before then.


Originally Posted by: Brian Gaze 

yes Brian- Hugely contradicting with the output available to us. Perhaps they ‘can see something’ upstream we cannot. Or perhaps they’ve just called it too early, as we’ve seen numerous times before (in both cold & mild situations).


 

DPower
25 November 2019 22:08:27

With ref to the post I made a couple of days back at least the models have been consistent with them showing a less amplified pattern once we get into the semi reliable. A pattern that has been evident all Autumn. Rather cold it is then and always was. 


A warming forecast in the strat at 30mb over the next several days could be much more productive in bringing a colder synoptic pattern in about 10 to 15 days time than the rather cold one we are looking at this coming weekend.

Rob K
25 November 2019 22:42:55


A 4 to 5 day event doesn't fit in with the Met O forecast at all. Their current update talks about the cold breaking down after 10/12 and wintry showers before then.


Originally Posted by: Brian Gaze 


Has the Met completely changed its tune then? Last time I was on here only a few days ago the models were showing colder conditions but everyone was saying the Met were having none of it and going mild all the way!


 


Good to know things still chop and change as much as they ever did.


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
Gandalf The White
26 November 2019 01:01:14

ECM 12z ensemble for London suggests a 5-day coldish spell followed by a brief recovery to average or rather mild and then the usual uncertainty.



http://www.weathercast.co.uk/meteo/eps/ensemble-tt6-london.gif


Location: South Cambridgeshire
130 metres ASL
52.0N 0.1E


Steve Murr
26 November 2019 02:00:31
Just noting the developments of the day we 'could' squeeze another 24/36 hours out the cold spell as the models are developing a trough swinging round SW from the main parent low at 162 over Norway which could slide down into the SE as the high elongates...

It would introduce that element of -7/-8c air for another day on top of the original cold plunge probably making it 5 maybe 6 days....
Steve Murr
26 November 2019 03:32:31
Hum Worth noting the 00z ICON
Bigger wedge of cold .... ❄️
JACKO4EVER
26 November 2019 07:17:33
I can see overnight fog becoming an issue if winds fall light at the end of the week. Hopefully a drier spell to come, next week is anyone’s guess
DEW
  • DEW
  • Advanced Member
26 November 2019 07:33:05

Jetstream running south of the UK this week though with a weaker northern branch promoting some additional cold weather.then early next week (around the 2nd) some big loops taking it north and  encasing HP for the UK and LP for the Med. By the 8th it's back running strongly across the UK and deep into Europe.


GFS copies this with a brief northerly this week and then the HP settling in for a few days around the 2nd before zonal comes back for the rest of that week. Then rinse and repeat: northerly on the 8th/9th brief HP on the 11th which looks as if it will be back to zonal a few days later. All looks like traditional Decemeber weather to me. ECM similar at first but keeps the HP going from the 2nd to the end of the run on Fri 6th.


GEFS temps 4-5 C below average 29th - 3rd, then 2-3 C above until about the 7th when (with some variations) it drops back to just below normal.Dry for 29th - 3rd (yesterday's suggestion of rain on the 1st now SW only) then a bit of rain anywhere and everywhere.


 


War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl
ballamar
26 November 2019 07:55:28
ECM looks very interesting from an overall view
www.wetterzentrale.de/maps/ECMOPNH00_240_1.png
Could be good if the warming becomes more of a trend
Steve Murr
26 November 2019 10:23:49

Whilst its not spectacular the GFS for the SE now has Easterly winds all the way out to the 4th as the models continue to amplify the jet especially over Southern Europe.

What it means is we can still see the -8c line push in but will eventually get mixed out- Still its an amazing change from the +8c line depicted by the GFS at the weekend..

Rob K
26 November 2019 10:43:47
Looking at the ensembles GFS seems to be firming up on a four-day chilly spell from the 29th, then a milder interlude before a likely return to cooler conditions around the following weekend as the high pressure ridges again.
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
fairweather
26 November 2019 10:57:05

All a bit of a yawn but we've had worse prospects in December than this regarding cold opportunities. The good thing with this brief cold snap at the start of December is that it heralds the start of believing that future cold spells could bring snow.


S.Essex, 42m ASL
roadrunnerajn
26 November 2019 11:06:45
After this cool spell later this week the east coast could see temperatures of 15 or 16c next Wednesday with a very mild gusty westerly wind.
Probably not ideal for high sided vehicles on the A1.
Germoe, part of the breakaway Celtic Republic.
Steve Murr
26 November 2019 11:23:43
Significant swing to the 00z ICON in the 06z GFS mean-
00z 850 Mean for london @192 was 0c

Now its down to -6c at 180....

Watch the ENS graph elongate the cold spell...
Steve Murr
26 November 2019 11:26:42
WOW
X4 -10 runs for london & 1 -11c !!!
ballamar
26 November 2019 12:22:48

WOW
X4 -10 runs for london & 1 -11c !!!

Originally Posted by: Steve Murr 


 


only when one of those is shown in the operational will it get the excitement levels up - there could be a big change coming in the mood levels soon

DEW
  • DEW
  • Advanced Member
26 November 2019 13:57:44


Whilst its not spectacular the GFS for the SE now has Easterly winds all the way out to the 4th as the models continue to amplify the jet especially over Southern Europe.


Originally Posted by: Steve Murr 


Some misdirection here? Follow the isobars back and it's not a Beast from the East but a sunbed from the Med?


Well, maybe not that warm, but I couldn't think of a better rhyme


War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl
Steve Murr
26 November 2019 14:37:05


 


Some misdirection here? Follow the isobars back and it's not a Beast from the East but a sunbed from the Med?


Well, maybe not that warm, but I couldn't think of a better rhyme


Originally Posted by: DEW 


 


No misdirection - I think you are mislead ?


Have a look at the 3/4 runs that get below -9c in the 170-190 area & all the isolines track into Scandi....

DEW
  • DEW
  • Advanced Member
26 November 2019 14:51:47


 


 


No misdirection - I think you are mislead ?


Have a look at the 3/4 runs that get below -9c in the 170-190 area & all the isolines track into Scandi....


Originally Posted by: Steve Murr 


And all the other runs? Shall we have a democratic decision?


War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl
Brian Gaze
26 November 2019 15:41:16

Big shift from the UK Met today. TBH I didn't establish what data they based their expectation of a lengthy cold spell on. ECM30 had a mild signal as did GEFS. MOGREPS only goes out to 8 days I think.


Brian Gaze
Berkhamsted
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ktaylor
26 November 2019 16:55:07

I watched the weather studio from the met office today and it showed the polar vortex is on the move and being squashed towards eurasia. Think that was what it said. It said there was least likely a chance of a sudden stratospheric warming and the polar vortex should recover


Come on you spurs
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https://www.ryarshprotectiongroup.com 
Arcus
26 November 2019 17:37:22


Big shift from the UK Met today. TBH I didn't establish what data they based their expectation of a lengthy cold spell on. ECM30 had a mild signal as did GEFS. MOGREPS only goes out to 8 days I think.


Originally Posted by: Brian Gaze 


ECM30 doesn't look all that mild to me? 






Ben,
Nr. Easingwold, North Yorkshire
30m asl
Argyle77
26 November 2019 17:48:46
Looks like going Zonal early next week,not surprising.December has never been a very wintry month in the U.K.

In my lifetime only two Decembers stand out 81 and 2010, can not recall much snow away from those years.

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