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TimS
  • TimS
  • Advanced Member
26 June 2020 21:36:04
Very useful resource, as always - from earlier this week:

https://www.aer.com/science-research/climate-weather/arctic-oscillation/ 



Brockley, South East London 30m asl
Rob K
27 June 2020 06:47:46
Plenty of warm runs showing on the GEFS from about 6 July but also a small cluster keeping it cool. Lots to sort out yet.
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
Ally Pally Snowman
27 June 2020 07:00:10

Yes the 6th July improving signal fading somewhat this morning.


Bishop's Stortford 85m ASL.
Heavy Weather 2013
27 June 2020 07:02:43


Yes the 6th July improving signal fading somewhat this morning.


Originally Posted by: Ally Pally Snowman 


These ensembles paint a slightly better picture for Londonat least. 06 July onwards looks better. Naturally lots of water under the bridge first of all.


http://old.wetterzentrale.de/pics/MT8_London_ens.png


 


Mark
Beckton, E London
Less than 500m from the end of London City Airport runway.
Ally Pally Snowman
27 June 2020 07:21:43


 


These ensembles paint a slightly better picture for Londonat least. 06 July onwards looks better. Naturally lots of water under the bridge first of all.


http://old.wetterzentrale.de/pics/MT8_London_ens.png


 


Originally Posted by: Heavy Weather 2013 


 


Yes hopefully just some dodgy Ops. 6th July still quite along way away though so nothing guaranteed.


 


Bishop's Stortford 85m ASL.
Ally Pally Snowman
27 June 2020 07:47:19


 


 


Yes hopefully just some dodgy Ops. 6th July still quite along way away though so nothing guaranteed.


 


Originally Posted by: Ally Pally Snowman 


The ECM mean looks more promising this morning.


 


Bishop's Stortford 85m ASL.
DEW
  • DEW
  • Advanced Member
27 June 2020 10:27:57

Jetstream running quite strongly across S of UK for the time of year to Sat 4th. then shifting N to Scotland until Thu 9th before breaking up into loops and fragments, one of which running from SW on Mon 13th might bring up some warmth from the S - a long way off.


GFS 6z: LP over N Scotland pulling away to Norway by Wed 1st and leaving some N/NE-lies in its wake; new LP 975mb well established mid-Atlantic Fri 3rd; that turns into a disorganised mainly zonal weather with source of air from SW to Wed 8th before Azores P taes control Sat 11th, mainly over Scotland with continental LP for the S


GEFS: temp below normal for last few days of June, then mean is back to normal  - slight dip in S around Sat 4th, better around Tue 7th but little agreement further out. Rain in Scotland from now onwards,  in S most likely for a week beginning Tue 30th, drier later. in both areas


ECM 0z: Much the same as GFS above


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

Chichester 12m asl
Ally Pally Snowman
27 June 2020 10:40:35

Azores high pushing in nicely day 8 on the GFS 6z . Need to get this to day 5 to have faith though.


 


Bishop's Stortford 85m ASL.
TimS
  • TimS
  • Advanced Member
27 June 2020 10:42:04
GFS 06z goes hot around the 7th-9th. Seems like in most runs there is at least one high pressure outbreak somewhere between the 4th and 10th.
Brockley, South East London 30m asl
Quantum
27 June 2020 10:43:03

July 1993

UserPostedImage

Also July 2015 had a small pocket of -5C

Originally Posted by: picturesareme 


But crucially none of those events actually had the -5C touch the UK. I mean neither will this one probably, but it is no doubt exceptional and if it does touch record breaking.


 


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.
TimS
  • TimS
  • Advanced Member
27 June 2020 11:33:00

The inflection point seems to be the 4th, for both SLP and temperature. 


Brockley, South East London 30m asl
TimS
  • TimS
  • Advanced Member
27 June 2020 14:31:35

Tomorrow could give us another crack at the all time renewable energy record, so long as demand is high enough.


Windy in the North, West and North Sea where most of the wind turbines are (though not quite as windy as I’d ideally like in the Hebrides), and sunny at midday in the South where most of the solar panels are. 


Brockley, South East London 30m asl
TimS
  • TimS
  • Advanced Member
27 June 2020 18:55:13
Feels like TimS’s model output thread at the moment.

The signal for a pattern change from 4th July onwards remains pretty strong across the models.

The last low of the current Atlantic train crosses us next weekend. Two evolutions from then. We either get zonal winds and warmth from Friday onwards, or more cyclonic weekend, then a brief northerly toppler, then the ridge comes in.


Brockley, South East London 30m asl
TimS
  • TimS
  • Advanced Member
27 June 2020 18:58:16




The GFS evolution is in the minority.



Brockley, South East London 30m asl
White Meadows
28 June 2020 00:09:14
Amongst the tumble weeds...
a positive signal for Above average warmth in July:
http://old.wetterzentrale.de/pics/MT8_London_ens.png 
DEW
  • DEW
  • Advanced Member
28 June 2020 06:50:29

https://www.natice.noaa.gov/pub/ims/ims_gif/DATA/cursnow_asiaeurope.gif Open water now showing along Arctic coasts esp Sibeia


http://www.wxmaps.org/pix/temp4 NW/SE split for the next fortnight, both areas drier and a little warmer in week 2 but no heat wave. 


FAX looking disturbed with current LP filling and being replaced by another from Atlantic at end of week, but not before a final small disturbance runs along the Channel on Tue/Wed. 


GFS shows procession of depressions - Scotland 990mb Mon 29th moving to Baltic, mid-Atlantic 980mb Fri 3rd moving to N Norway, mid-Atlantic 1000mb Mon 6th moving past Faeroes,  before the model experiments with HP close to UK Wed 8th, even that is affected by continental LP in SE Fri 10th.


GEFS temps back to normal Wed 1st, and mean of runs close to seasonal average (a little below in the N) through to Tue 14th but with enough scatter to allow any form of cherry-picking from Sun 5th onwards. Best chance of rain in S around Sun 5th bits on either side of that esp later on; in the N the rain appears a little earlier and is more persistent in Scotland.


ECM brings the LP forecast on GFS for Fri 3rd across the UK, not the Faeroes, but the LP on Mon 6th is there and the swift recovery with HP over the UK shown on yesterday's 12z may not now happen (will need editing as 12z chart for Tue 7th still showing at time of posting) EDIT - well, the HP is sort of there Tue/Wed 7th/8th but only rather timorously affecting the S and even then Iberian low is developing strongly


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

Chichester 12m asl
Rob K
28 June 2020 06:56:01
The encouraging signal for warmth on GEFS yesterday (in terms of 850mb temperature) seems to have largely disappeared this morning with a huge amount of scatter leaving the mean around average or slightly below. The op run shows the Greenland high building strongly towards the end which isn’t a good sign.
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
TimS
  • TimS
  • Advanced Member
28 June 2020 08:04:50

The encouraging signal for warmth on GEFS yesterday (in terms of 850mb temperature) seems to have largely disappeared this morning with a huge amount of scatter leaving the mean around average or slightly below. The op run shows the Greenland high building strongly towards the end which isn’t a good sign.

Originally Posted by: Rob K 


The rise in pressure seems to be there in the GEFS still, just not the net rise in 850s. I looked at the postage stamps for 24hrs and I think the reason is there are a number of perturbations with a ridge to the West and NW flow. May well change again.



Brockley, South East London 30m asl
Ally Pally Snowman
28 June 2020 08:26:58

Good ECM this morning especially the mean above 10c 850s at day 6 and stays there. 


Bishop's Stortford 85m ASL.
David M Porter
28 June 2020 08:55:58


Just to say, and sorry for being completely off topic here, but as this is where I predominantly post, I'm going off line for a few days. I have had some heartbreaking news tonight that my loving Auntie who looked after me when my mum died when I was 16, has passed away. I am distraught and devastated and puts all of my moaning into perspective. Sorry to everyone for being so annoying....but I will come back with a fresh mindset, but right now, I need a few days or so to mourn the death of my loving Auntie who I cared for like a mother. x


Originally Posted by: moomin75 


Kieren, I am so very sorry to read about your sad news; I've only just read this for the first time a few minutes ago. Deepest condolences to you and the rest of your family at this time.


Lenzie, Glasgow

"Let us not take ourselves too seriously. None of us has a monopoly on wisdom, and we must always be ready to listen and respect other points of view."- Queen Elizabeth II 1926-2022
TimS
  • TimS
  • Advanced Member
28 June 2020 10:46:19
GFS 06z continues what is now a very established theme. Ridge moving in after the storm track migrates closer to its Iceland home, and then a quietening down of the isobars and a more dog days type of pattern of slack pressure, with alternating cool northerly plunges, warm high pressure spells, and the risk of slow moving thundery lows.

I think what we may be seeing is a return to the pattern that dominated spring. Alongside sunshine and warm spells we also had a number or unusually cold (but dry) Northlerly outbreaks.
Brockley, South East London 30m asl
TimS
  • TimS
  • Advanced Member
28 June 2020 16:16:46
Rubbish GFS 12z so far. ICON not good either. It’s been a day when runs have gone backwards.
Brockley, South East London 30m asl
tierradelfuego
28 June 2020 18:23:02
GEFS 12z shows the MLSP down here at least to be such an outlier on the 5th/6th that it isn't even worth looking at the 850 or rainfall. It drags the mean down to such a large extent. Let's hope it's not onto something...
Bucklebury
West Berkshire Downs AONB
135m ASL

VP2 with daytime FARS
Rainfall collector separated at ground level
Anemometer separated above roof level
WeatherLink Live (Byles Green Weather)
doctormog
28 June 2020 19:24:36

GEFS 12z shows the MLSP down here at least to be such an outlier on the 5th/6th that it isn't even worth looking at the 850 or rainfall. It drags the mean down to such a large extent. Let's hope it's not onto something...

Originally Posted by: tierradelfuego 




 


 


 


DEW
  • DEW
  • Advanced Member
29 June 2020 07:07:33

GFS this morning still has that train of depressions, if anything closer to the UK and with more of a trailing trough across the S as each in turn moves off (current 990mb Scotland, trail to Wed 1st; next 990 mb Hebrides Fri 3rd, trail to Sun 5th;  995mb Hebrides Tue 7th; lastly 1000mb Hebrides Fri 10th). HP finally re-establishes itself ridged from Azores to N Britain Wed 15th but not without some LP wandering around Brittany and down to Spain.


GEFS temps in S rising to seasonal norm to Fri 3rd July then a warm spell for 3-4  days (though the Op run disagrees and throws extra rain in as well) and then, with the usual scatter, temps slightly below norm out to Wed 15th. Bits and pieces of rain mostly Wed 1st in S (though MetO brings it in on Tue) and a cluster Mon/Wed 13/15th. Scotland similar though cooler wrt norm throughout (i.e. for 'warm' read 'average' and 'slightly below' read 'definitely below'; & rain in small amounts throughout.


ECM as GFS to the 7th when it takes that LP further north and then brings in the Azores high much earlier, well established by Thu 9th


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

Chichester 12m asl

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