The Weather Outlook

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TimS
  • TimS
  • Advanced Member
23 August 2021 10:02:35


A quick skeg through the models seem to be showing this Summer ending exactly how it started with persistent nor'easters here at Kent. Often dry and bright but suppressed temperatures.


Originally Posted by: idj20 


Yes, another product of the common fly in the ointment that has blighted the far South East this summer: the persistence of low pressure to our East and South East meaning that:



  • High pressure gets forced a bit too far North and undercut by cloudy North Sea air

  • The usual Westerlies don't ridge over Kent and the near continent but swoop down towards Germany and Switzerland bringing cool and cloud to the SE but more ridgy and dry weather to the NW and Ireland

  • in periods of slack pressure there is enough instability close by to give us repeated doses of heavy showers  


Brockley, South East London 30m asl
DEW
  • DEW
  • Advanced Member
24 August 2021 06:54:21

wx summaries - yesterday's downgrade in temps confirmed, but now rather drier through to end of week 2. BBC also on board with a period of cool NE-lies towards the end of this week.


jet - omega block keeping the jet away from UK and up near Iceland; begins to break up Thu 2nd with occasional streaks close to UK mostly running N-S down the N Sea; then more organised W-E flow across N Scotland from Mon 6th


GFS op -current HP persisting and drifting N with some NE-ly flow for England at end of week but then (like ECM yesterday) ridge builds from Scotland to Norway Sun 29th with more of an E-ly flow and source of air from N cut off in favour of source in C Europe. The HP centre moves NW  Sat 4th allowing NE-lies back briefly before a quick shift S-wards introduces the familiar zonal flow. An ex-hurricane appears in mid-Atlantic Thu 2nd but makes no further progress before dying away.


GEFS - temps near seasonal norm in the S or a little above in the N with quite good agreement between runs to Fri 3rd, after which perhaps a little cooler and rain appearing in a few runs.


ECM - similar to GFS though deeper LP in Baltic adds some strength to the E/NE winds on the E coast


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

Chichester 12m asl
DEW
  • DEW
  • Advanced Member
25 August 2021 06:32:17

WX Summaries: still cool with temp noticeably below average for all W Europe including UK though some warmth pushing into SW France. The Uk stays dry while there is more rain about on the Continent.


Jet: spends most of its time in a loop up towards Iceland; a brief blast from the N for the UK Sun 5th as the  loop has a wobble.


GFS op: HP centred around the NW of Britain 1030 mb, finally reaching 1035 mb Wed 1st, with the E coast and the SE getting E/NE winds which may bring in cloud there from time to time. something of a breakdown Fri 3rd as the HP weakens and moves W-wards, even a hint of a Spanish plume; but the plume comes to nothing and the HP is back and centrally placed 1030mb Wed 8th onwards.


GEFS - mean of temp runs close to norm with agreement until Wed 1st (up and down a bit in the S, consistently a little above in Scotland) after which the usual variation sets in though mean still symmetrically close to norm, as many warm outliers as cool ones. Dry throughout, some runs with a small amount of rain after Fri 3rd and a very few runs  in the S with extreme rainfall spikes.


ECM ( 12z after Mon 30th, I might come back and update later) but very much like GFS


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

Chichester 12m asl
Brian Gaze
25 August 2021 07:37:10

September warmth proving more reliable than Sir Donald Bradman?



Brian Gaze
Berkhamsted
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Jiries
25 August 2021 08:05:55


September warmth proving more reliable than Sir Donald Bradman?



Originally Posted by: Brian Gaze 


Up to 12-13C ?  Should be around 26-27C in Manchester but how it can reached that if very overcast skies and raw outside now.  Cant wait to get out of August and hope Sept to become summer month extension and October if possible to make up for it.

four
  • four
  • Advanced Member
25 August 2021 08:37:18
Well above the mean is the point, those aren't surface temps.
GezM
  • GezM
  • Advanced Member
25 August 2021 09:30:21
GEFS output posted above is encouraging if you like it dry and warm (but not hot!). The early September mean is not being lifted by a couple of hot outliers this time and there is more general consensus for warmer air pushing across the UK. The main theme today is dry but as ever with a UK high, cloud amounts are uncertain. And this is still about a week out so things could change.
Living in St Albans, Herts (116m asl)
Working at Luton Airport, Beds (160m asl)
DEW
  • DEW
  • Advanced Member
26 August 2021 07:15:12

Wx summaries show more warmth and dryness moving in from the SW than did yesterday; but N Scotland remains cool and later wet


Jet staying as a lop around Iceland until Wed 8th when it runs strongly across N Scotland and a few days later translates into a loop affecting the W/NW of UK


GFS op  - HP centred over N Scotland until Sat 4th with E-lies for S England; then the HP weakens and transfers S becoming stronger again  and centred over Nw France Thu 9th and SW-lies for the W side of UK. Last frame on Sat 11th shows deep depression approaching NW Scotland


GEFS - temps in agreement not far from norm until Sun 5th (for the S a little cooler at first, a little warmer later, for the N consistently above seasonal norm) then a lot of variation with op & control bullish for warmth but several v. cold runs as well. A little rain likely after the 5th but dry before that. 


ECM - similar to GFS but HP  only affecting S England by Sun 5th after the weakening noted under GFS


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

Chichester 12m asl
David M Porter
26 August 2021 08:08:49


🤣🤣🤣 It certainly feels that way. It has been an absolutelegend horrendous summer here. 7 cricket matches (out of 16 so far) washed out this year. That is the worst ever in my 30 years playing cricket. Virtually half the season washed out. Incredible. Worst by miles.


Originally Posted by: moomin75 


Worse than even 2012 and 2007?


Blimey!


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
Cumbrian Snowman
26 August 2021 08:35:56

The cricket game analogy is interesting. Up here in the Eden Valley Cricket League (Cumbria), just two games lost this season to the weather. Best for years.


Not a single adult game Saturday or Sunday played on astro, grass all the way. In fact as the groundsman a little more rain would have been helpful.


 


Anyway back to the weather models - wondering if developments in the Gulf Of Mexico will impact on us in 8-10days ?


fairweather
26 August 2021 09:20:05

I would like to see some clear nights next week. It's a good week for astrophotography with a new moon. I won't hold my breath though - a lot of cloud could be around in the S.E.


S.Essex, 42m ASL
ozone_aurora
26 August 2021 18:37:07


I would like to see some clear nights next week. It's a good week for astrophotography with a new moon. I won't hold my breath though - a lot of cloud could be around in the S.E.


Originally Posted by: fairweather 


I hope so. Hadn't done any astrophotography since around 20 July, when I captured Jupiter & Saturn. Hope to get Uranus & Neptune this Autumn.

DEW
  • DEW
  • Advanced Member
27 August 2021 07:21:22

Wx summaries sow a bit of warmth in the SW week 1, in the SE week 2, but still underwhelming. Dry everywhere week 1, some rain in N Scotland week 2.


GFS op : large HP centred over NW Scotland to Sat 4th, some E or NE winds off the N Sea for S and SE England; then the centre moves S-wards to N France for a few days to Wed 8th and allowing trough to move in 1005mb Western Isles Fri 10th before showing signs of revival from the SW Sun 12th


GEFS ; temps close to norm with good agreement between runs to Sun 5th (op is a cold outlier) after which marginally warmer on average but wide range (op & control then amongst the warmest at least for the S). very dry in the S; perhaps a little rain week 2 in N


ECM ; a  collapse of HP a week earlier, Fri 3rd with broad an shallow trough over all UK; HP reviving from the SE Mon 6th


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

Chichester 12m asl
GezM
  • GezM
  • Advanced Member
27 August 2021 09:47:26
The general theme of the last few days has been the return to a 'more typical' situation of higher pressure to the south of the UK. This of course would encourage a westerly flow and there are also hints of continental air pushing northwards in early September as high pressure nudges into the south of the UK.

So some chance of a brief Indian summer (depending on how you define that!), but always a risk that low pressure areas to the north of the UK sink far enough south to disrupt the whole of the UK.

Perhaps Tim S will get a few grapes harvested after all!?


Living in St Albans, Herts (116m asl)
Working at Luton Airport, Beds (160m asl)
briggsy6
27 August 2021 16:50:32

The season of mists and mellow fruitfulness 'tis nearly upon us..


Location: Uxbridge
Taylor1740
27 August 2021 18:10:55
Doesn't look like September will be giving us a late season heatwave, so straight into Autumn it will be...
NW Leeds - 150m amsl
Sevendust
27 August 2021 20:40:54

Doesn't look like September will be giving us a late season heatwave, so straight into Autumn it will be...

Originally Posted by: Taylor1740 


12z ensembles suggest a warm and dry first week

Jiries
27 August 2021 21:12:24


 


12z ensembles suggest a warm and dry first week


Originally Posted by: Sevendust 


Had a feeling that September might be the month to see the first ever wall to wall sunshine since mid June here only 1 day in 92 of summer day had been wall to wall sunshine so far. 

Ally Pally Snowman
28 August 2021 06:57:26

Warm and dry first half of September but how much cloud? It's been the bane of the whole summer.


 


 


 



 


Bishop's Stortford 85m ASL.
DEW
  • DEW
  • Advanced Member
28 August 2021 07:31:10


Warm and dry first half of September but how much cloud? It's been the bane of the whole summer.


 


Originally Posted by: Ally Pally Snowman 


A London-centric view? The WX summaries keep it cool for the north though today's view is for dry everywhere. However, I agree, it's time the SE got some better weather.


GEFS - see above but note that Scotland temp declines towards the norm and below in week 2, and has more though still small amounts if rain then


GFS - HP continues centred over NW Scotland to Fri 3rd with NE-lies for the E Coast of UK. IT then moves SE an settles over the Low Countries 1030mb Tue 7th before moving N again and allowing trough of LP to approach from the S Fri 10th. This trough comes to nothing and HP moves in from the SW to become centred over the Channel Mon 13th with SW-lies for NI & Scotland


ECM - differs from GFS after Fri 3rd with first a shallow LP over the SW and then a major trough approaching NW Scotland 995mb Rockall Tue 7th with pressure low across most of UK (the BBC WFTWA last night had a similar downgrade for later next weekend)


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

Chichester 12m asl
doctormog
28 August 2021 07:42:46
The continuing dryness of the outlook is particularly notable.
Ally Pally Snowman
28 August 2021 07:45:52


 


A London-centric view? The WX summaries keep it cool for the north though today's view is for dry everywhere. However, I agree, it's time the SE got some better weather.


GEFS - see above but note that Scotland temp declines towards the norm and below in week 2, and has more though still small amounts if rain then


GFS - HP continues centred over NW Scotland to Fri 3rd with NE-lies for the E Coast of UK. IT then moves SE an settles over the Low Countries 1030mb Tue 7th before moving N again and allowing trough of LP to approach from the S Fri 10th. This trough comes to nothing and HP moves in from the SW to become centred over the Channel Mon 13th with SW-lies for NI & Scotland


ECM - differs from GFS after Fri 3rd with first a shallow LP over the SW and then a major trough approaching NW Scotland 995mb Rockall Tue 7th with pressure low across most of UK (the BBC WFTWA last night had a similar downgrade for later next weekend)


Originally Posted by: DEW 


The SE deserves some warmth .


 


Bishop's Stortford 85m ASL.
doctormog
28 August 2021 08:14:42


 


The SE deserves some warmth .


 


Originally Posted by: Ally Pally Snowman 


I suspect in absolute terms it has been a warmer summer in the SE than in most of the U.K. (not in terms of deviation from climate mmeans).


DEW
  • DEW
  • Advanced Member
28 August 2021 11:59:13


 


I suspect in absolute terms it has been a warmer summer in the SE than in most of the U.K. (not in terms of deviation from climate mmeans).


Originally Posted by: doctormog 


True, just about, but this summer has gone  a long way towards evening up a typical difference between the Scottish lowlands (avg 11-12C for summer months) and the London area (avg 13-14C) with the MetO saying that the 'north' (however they define that) has been 1.5C above avg while the SE has been normal


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

Chichester 12m asl
doctormog
28 August 2021 12:01:48


 


True, just about, but this summer has gone  a long way towards evening up a typical difference between the Scottish lowlands (avg 11-12C for summer months) and the London area (avg 13-14C) with the MetO saying that the 'north' (however they define that) has been 1.5C above avg while the SE has been normal


Originally Posted by: DEW 


Yes, that’s true. “The North” has also had drier weather for some of the time which probably adds to the perception of a better summer (t)here.


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