Hungry Tiger
17 October 2017 19:42:43

Originally Posted by: Bertwhistle 


Actually that would be a coincidentally amazing pattern shift across the month boundary- from benign autumnal pleasantry at the very end of October, to an Arctic blast so early in November. Early November northerlies- even with sub- -5C uppers- don't often produce snow in CSEngland; an easterly like early Nov 1980 is more effective, but rare as hen's teeth. That said, this northerly is mapped out as something special, with some intrusion of the Scandi low westwards and -10 uppers flirting with the far Northern Isles.


Something blocky this way comes? Too far that way to call.



Just think of November 1978 - and November 2010. They are rare - But that chart would never surprise me if that came off this year.


 


Gavin S. FRmetS.
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Stormchaser
18 October 2017 19:27:41

 


Some oddness going on with the chart links today. Had to remove everything in the links from 'chart=' leftward to get them to work.


Anyway - watching (after a difficult start as the trough breaks down rather messily) the 15*C 850 hPa isotherm expand enormously across western Europe and then to the SW of the UK days 7-10 of the ECM run makes me wonder if it's actually still September and we've all been had for laughs 

Seriously though - if that plume of warmth was sent directly our way instead of to the west, we'd probably see temps a few degrees past 20 in favoured spots, provided of course mist, fog and low cloud all step aside for a bit - which is increasingly rare as October wears on, I know. Without a brisk flow and dry enough air entrained, we'd just end up with a fog-fest or low-cloud-fest. The former would be of some interest with unusually dense fog likely given that warmer air holds more moisture at saturation, but the low cloud outcome would be just dire... already far too much of that here in recent times with last Fri-Mon almost entirely blighted by it. I never even got to see 20*C on the thermometer! 


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picturesareme
19 October 2017 01:01:05

Originally Posted by: Stormchaser 


 


Some oddness going on with the chart links today. Had to remove everything in the links from 'chart=' leftward to get them to work.


Anyway - watching (after a difficult start as the trough breaks down rather messily) the 15*C 850 hPa isotherm expand enormously across western Europe and then to the SW of the UK days 7-10 of the ECM run makes me wonder if it's actually still September and we've all been had for laughs 

Seriously though - if that plume of warmth was sent directly our way instead of to the west, we'd probably see temps a few degrees past 20 in favoured spots, provided of course mist, fog and low cloud all step aside for a bit - which is increasingly rare as October wears on, I know. Without a brisk flow and dry enough air entrained, we'd just end up with a fog-fest or low-cloud-fest. The former would be of some interest with unusually dense fog likely given that warmer air holds more moisture at saturation, but the low cloud outcome would be just dire... already far too much of that here in recent times with last Fri-Mon almost entirely blighted by it. I never even got to see 20*C on the thermometer! 



 


Some notable cold building out east though ;)

Hippydave
19 October 2017 08:22:31
Hmmmm. Other than the odd cooler interlude It's all looking notably warmer than average to me at present, with the 6z gfs screaming humid, foggy and cloudy for large parts of the run. With HP fairly prevalent just to the East it could well take a while to break out of this pattern - will be good for avoiding using the heating down here I spose but It's not particularly interesting.
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moomin75
19 October 2017 08:34:54

Originally Posted by: Hippydave 

Hmmmm. Other than the odd cooler interlude It's all looking notably warmer than average to me at present, with the 6z gfs screaming humid, foggy and cloudy for large parts of the run. With HP fairly prevalent just to the East it could well take a while to break out of this pattern - will be good for avoiding using the heating down here I spose but It's not particularly interesting.


I don't think a warm October necessarily gives us any clues for the forthcoming winter but I would much rather see these synoptics now than in mid-late November when I think it appears to be increasingly difficult to break out of.


Indeed the infamously warm December of 2015 had these type of synoptics in November leading me to plump for a record breaking December which (by luck not judgement) came off.


If skies can clear for any amount of time then yes fog becomes an issue but equally if we can tap in to the warmth still to our South then high teens to low 20s cannot be ruled out. I am looking at seeing whether we can have another scarily warm Halloween which seems possible.


Witney, Oxfordshire
100m ASL
Gavin D
19 October 2017 08:39:37

Parts of France continue to see temps near 30 4 day's off November on this morning's ECM


0508311d-04f4-492b-982a-1739980105ee.thumb.png.67894cfd2780e95c9e4e1df3ff097742.png


Stormchaser
19 October 2017 12:59:29


So even after the first trough disruption fails, ECM still sets up the dug-down low near the Azores by day 10, while having built a mighty plume of heat to the south - and yes that is actual 'heat' not far south of us, as Gavin D handily highlighted this morning. 


Starting to wonder if the Halloween Heater will be seen for the third time in four years... I'm having to get used to having birthdays with early-mid-afternoon temps near 20*C! 


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Hungry Tiger
19 October 2017 13:15:38

Originally Posted by: Stormchaser 



So even after the first trough disruption fails, ECM still sets up the dug-down low near the Azores by day 10, while having built a mighty plume of heat to the south - and yes that is actual 'heat' not far south of us, as Gavin D handily highlighted this morning. 


Starting to wonder if the Halloween Heater will be seen for the third time in four years... I'm having to get used to having birthdays with early-mid-afternoon temps near 20*C! 



The record Haloween max was 23.6C. I wonder if that is under threat this year. Amazing.


Gavin S. FRmetS.
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DEW
  • DEW
  • Advanced Member
20 October 2017 06:49:27

After all the excitement of this week, the Atlantic goes into snooze mode, not to say sunbathing for a couple of weeks. But if you credit GFS at long range, the weekend of Nov 4/5 will be a bad idea for a bonfire party. Miserably cold in addition to rain and wind.


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Chichester 12m asl
moomin75
20 October 2017 22:34:20
Continued signs on the 18z of a notably warm end to October. I am starting to think we are going to get a record warm Halloween. Insane charts with the 564 dam line in the south. 20c plus maxes?
Witney, Oxfordshire
100m ASL
picturesareme
20 October 2017 22:37:29

Originally Posted by: moomin75 

Continued signs on the 18z of a notably warm end to October. I am starting to think we are going to get a record warm Halloween. Insane charts with the 564 dam line in the south. 20c plus maxes?


Looking at the bigger picture the 12z had a split vortex with high pressure  from Alaska to Scandinavia at one point... I'm waiting to see if continues...

Nordic Snowman
21 October 2017 05:46:19

Quite nice in seeing these warm plumes being shown. 20c by the end of the month? Yes please!!!


Quite funny as I believe it was The Star (not the Express this time) which wrote a piece (about 7-8 days ago!) on the likelihood of a record-breaking warm Halloween. They could be right.... for once.


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Brian Gaze
21 October 2017 10:57:13

GFS06z well worth a look from this point onwards:


https://www.theweatheroutlook.com/twodata/gfs.aspx?run=06&charthour=201&chartname=mslp500&chartregion=na&charttag=500hPa%20GPDM


Prizes for everyone if it were to verify. 



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Gavin P
21 October 2017 12:25:08

That's the first wintry GFS run of the season... 


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Hungry Tiger
21 October 2017 13:00:57

Quite a few chart forecasts have hinted at a cold spell in the first week of November.


 


Gavin S. FRmetS.
TWO Moderator.
Contact the TWO team - [email protected]
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briggsy6
21 October 2017 14:36:06

Wouldn't surprise me, the weather always turns cold around Bonfire night. You could bet your house on it.


Location: Uxbridge
Gandalf The White
21 October 2017 14:50:12

Originally Posted by: briggsy6 


Wouldn't surprise me, the weather always turns cold around Bonfire night. You could bet your house on it.



Not in my experience it doesn't.   Mild, wet and windy is as likely as clear and cold; possibly more likely.


 


Location: South Cambridgeshire
130 metres ASL
52.0N 0.1E


Quantum
21 October 2017 15:09:04

Originally Posted by: Brian Gaze 


GFS06z well worth a look from this point onwards:


https://www.theweatheroutlook.com/twodata/gfs.aspx?run=06&charthour=201&chartname=mslp500&chartregion=na&charttag=500hPa%20GPDM


Prizes for everyone if it were to verify. 


 



That would be extremely wintry for the NW of Scotland. Thundersnow there for sure. I mean we all know it won't verify though...


Twitter: @QuantumOverlord (general), @MedicaneWatch (medicane/TC stuff)
2023/2024 Snow days (approx 850hpa temp):
29/11 (-6), 30/11 (-6), 02/12 (-5), 03/12 (-5), 04/12 (-3), 16/01 (-3), 18/01 (-8), 08/02 (-5)

Total: 8 days with snow/sleet falling.

2022/2023 Snow days (approx 850hpa temp):

18/12 (-1), 06/03 (-6), 08/03 (-8), 09/03 (-6), 10/03 (-8), 11/03 (-5), 14/03 (-6)

Total: 7 days with snow/sleet falling.

2021/2022 Snow days (approx 850hpa temp):

26/11 (-5), 27/11 (-7), 28/11 (-6), 02/12 (-6), 06/01 (-5), 07/01 (-6), 06/02 (-5), 19/02 (-5), 24/02 (-7), 30/03 (-7), 31/03 (-8), 01/04 (-8)
Total: 12 days with snow/sleet falling.
Brian Gaze
21 October 2017 15:23:38

Originally Posted by: Gandalf The White 


Not in my experience it doesn't.   Mild, wet and windy is as likely as clear and cold; possibly more likely.


 



I agree. 


Brian Gaze
Berkhamsted
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DEW
  • DEW
  • Advanced Member
22 October 2017 06:56:27

Lots of cold air moving into northern Europe next week


http://www.wxmaps.org/pix/temp4.html


GFS, and to a lesser extent ECM, show an Arctic rather than Siberian origin fr this air


http://www.meteociel.fr/modeles/gefs_cartes.php?code=0&ech=168&mode=0&carte=


I'm quite happy for the cold air to stay there for now if we can draw on it come January


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

Chichester 12m asl
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