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ozone_aurora
26 July 2024 08:14:19

Nothing is ever 100% but AAM is one of the better teleconnections . GFS might be over reacting this morning as GEM and UKMO are not as bad. But HP dominated early August seems unlikely this morning. 

Originally Posted by: Ally Pally Snowman 


Does AAM stand for Atmospheric angular momentum? Can't find much on the meaning of AAM when googling.

I do think that TWO should have a glossary page for acronyms.
ozone_aurora
26 July 2024 08:16:01

Nothing is ever 100% but AAM is one of the better teleconnections . GFS might be over reacting this morning as GEM and UKMO are not as bad. But HP dominated early August seems unlikely this morning. 

Originally Posted by: Ally Pally Snowman 


No, I didn't think August would be dominated be a HP. I think it'll be another mostly unsettled month. 

Roll on September then.
Ally Pally Snowman
26 July 2024 08:22:50

Does AAM stand for Atmospheric angular momentum? Can't find much on the meaning of AAM when googling.

I do think that TWO should have a glossary page for acronyms.

Originally Posted by: ozone_aurora 


Yes, here's a good guide from Netweather. 

https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://community.netweather.tv/learning/research/atmospheric-angular-momentum-aam-r20/&ved=2ahUKEwi7qsX2osSHAxWZYEEAHVlsEIIQFnoECBUQAQ&usg=AOvVaw1bfz8p7Mtbdn3-Ejv_LZM5 
Bishop's Stortford 85m ASL.
Saint Snow
26 July 2024 08:23:59
This is why holidaying in the UK is an utter lottery (where the odds are always against you)


I'm fearing our week in Devon will be a total waste of money, with lots of cloud, some rain, and cool temps around 20c that really aren't conducive to slobbing on the beach.




Martin
Home: St Helens (26m asl) Work: Manchester (75m asl)
A TWO addict since 14/12/01
"How can wealth persuade poverty to use its political freedom to keep wealth in power? Here lies the whole art of Conservative politics."
Aneurin Bevan
Ally Pally Snowman
26 July 2024 08:27:07
I'm certainly no expert when it comes to AAM but it is one of the more reliable teleconnections.  This summer in particular our better spells have coordinated with positive AAM and the poorer spells with negative.  But that is not always the case.
Bishop's Stortford 85m ASL.
Ally Pally Snowman
26 July 2024 08:32:53
The GEFS this morning are actually less unsettled than they were yesterday.  So maybe/hopefully a rogue Op. 

Bishop's Stortford 85m ASL.
Ally Pally Snowman
26 July 2024 10:49:07
GFS 6z is another poor one from day 7 onwards 
Bishop's Stortford 85m ASL.
picturesareme
26 July 2024 14:28:36
There's a heatwave on the way which looks like lasting at least 5 days, and yet it's all gloomy on here.
Saint Snow
26 July 2024 14:36:16

There's a heatwave on the way which looks like lasting at least 5 days, and yet it's all gloomy on here.

Originally Posted by: picturesareme 




I'm gloomy because it happens the week before I go to Devon, and 'my week' looks like being bobbins. Maybe others are just in sympathy for me 🤣


I'm holding out hope that 'my week' will be OK because up to just a few days ago, it was looking the much better week; this imminent 'heatwave' has expanded from a day or two of dry with decent temps.



Martin
Home: St Helens (26m asl) Work: Manchester (75m asl)
A TWO addict since 14/12/01
"How can wealth persuade poverty to use its political freedom to keep wealth in power? Here lies the whole art of Conservative politics."
Aneurin Bevan
bledur
26 July 2024 17:49:58

There's a heatwave on the way which looks like lasting at least 5 days, and yet it's all gloomy on here.

Originally Posted by: picturesareme 


Yes but now in these days of entitlement the "Heatwave" has to be at the right time.🤣
Ally Pally Snowman
26 July 2024 19:00:01
You can see how the AAM going negative has affected the output.  The LPs instead of heading towards Iceland they are now heading straight to the UK. Make the most of the next 5 or 6 days.

Bishop's Stortford 85m ASL.
Retron
27 July 2024 04:19:01


My gut feeling is the the Met Office and the AI will probably be the the correct output. :(

Originally Posted by: ozone_aurora 


My gut feeling, with a dose of pessimism and sod's law on top, is that we'll see 30 again within the next two weeks.

Originally Posted by: Retron 


(From 5 days ago)

Told ya!

https://www.metoffice.gov.uk/weather/forecast/gcpsvg3nc#?date=2024-07-30 

30s now appearing on the MetO automated.

Ignore plumey outlooks at your peril, unlike cold easterly blasts in winter they have a much higher chance of coming off!
Leysdown, north Kent
Jiries
27 July 2024 06:37:16

My gut feeling, with a dose of pessimism and sod's law on top, is that we'll see 30 again within the next two weeks.

Originally Posted by: Retron 


(From 5 days ago)

Told ya!

https://www.metoffice.gov.uk/weather/forecast/gcpsvg3nc#?date=2024-07-30 

30s now appearing on the MetO automated.

Ignore plumey outlooks at your peril, unlike cold easterly blasts in winter they have a much higher chance of coming off!



I have not yet got a heatwave for this year here and will be first time in my life not to see the heatwave.  Recent one just very warm sunny spells and first one was cloudy spell.  I always see a heatwave with full sunshine every summer even bad summers ranging from 33C to 38.6C in Epsom to 34C to 40.2C here in Nuneaton, this year only 28C which is just tad 5C above average.  This coming warm spell no exception so just standard warm summery spell as charts show 27-28C here.
Ally Pally Snowman
27 July 2024 06:49:01
Ecm still the best output and remains very warm in the SE and EA until next Sunday. 

Bishop's Stortford 85m ASL.
DEW
  • DEW
  • Advanced Member
27 July 2024 07:09:24
WX temps show warm weather pushing N over France in week 1 to affect most of Britain, especially the SE, and then retreating in week 2 with no more than average for N Europe and distinctly cool for Britain and Scandinavia. Continuing roastingly hot in the Aegean. Rain in week 1 in a band from Germany NE-wards, then in week 2 a mass of rain moving down from Iceland to cover Britain and areas close to the N Sea.

GFS Op - ridge of HP from the SW across Britain for the next few days, soon breaking down, first with warm LP from the S (MetO rain radar has heavy rain for the SE Wed 31st) then with cold LP from Iceland affecting NW Scotland by Sat 3rd and becoming centred over Britain 990mb N Ireland and Scottish Borders Wed 7th. The main centre moves away NE-wards but leaves a secondary moving SE-wards over Wales 995mb Sun 11th.

ECM - like GFS until Sat 3rd but then the centre of LP returns N-wards towards Iceland. A broad and rather cool trough nevertheless persists over Britain. Maybe just a little warmer and drier near the south coast.

GEM - continental plume more marked than the other two models but displaced all the same by Sat 3rd (990mb Hebrides and well-defined trough for the rest of Britain). Like ECM, the LP centre soon moves to the north, but this model then adds a marked trough approaching Ireland from the west Tue 6th.

GEFS - Pulse of warmth for the SE at maximum 6 or 7C above norm Wed 31st, much less marked further N and absent from N Scotland. Temps then drop slowly and remain near norm (mean) or a few degrees below (op & control) for the first week of August, recovering somewhat in the S at the end. Rain starting around 31st July and continuing throughout, front-loaded in the S, heavier later in the N and persisting there.
War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl
GezM
  • GezM
  • Advanced Member
27 July 2024 09:23:24

Ecm still the best output and remains very warm in the SE and EA until next Sunday. 

Originally Posted by: Ally Pally Snowman 


GEFS shows the likelihood of more unsettled weather generally after next Sunday,  but unlike the Ops run, it recovers again after a few days to something a bit drier and warmer.
Living in St Albans, Herts (116m asl)
Working at Luton Airport, Beds (160m asl)
Ally Pally Snowman
27 July 2024 11:00:56

GEFS shows the likelihood of more unsettled weather generally after next Sunday,  but unlike the Ops run, it recovers again after a few days to something a bit drier and warmer.

Originally Posted by: GezM 


Indeed the 6z GFS is basically Autumn.  Terrible run
Bishop's Stortford 85m ASL.
Saint Snow
27 July 2024 11:18:32
I'm on the verge of cancelling my holiday.

Sod's bloody law.



Martin
Home: St Helens (26m asl) Work: Manchester (75m asl)
A TWO addict since 14/12/01
"How can wealth persuade poverty to use its political freedom to keep wealth in power? Here lies the whole art of Conservative politics."
Aneurin Bevan
Col
  • Col
  • Advanced Member
27 July 2024 11:56:37

I'm on the verge of cancelling my holiday.

Sod's bloody law.

Originally Posted by: Saint Snow 


Whatever you do, don't do that. If you do the models will suddenly flip and some lucky bugger who got a late cancellation gets a weeks glorious weather.....
Col
Bolton, Lancashire
160m asl
Snow videos:
http://www.youtube.com/channel/UC3QvmL4UWBmHFMKWiwYm_gg
Saint Snow
27 July 2024 14:53:03

Whatever you do, don't do that. If you do the models will suddenly flip and some lucky bugger who got a late cancellation gets a weeks glorious weather.....

Originally Posted by: Col 



🤣👍

Martin
Home: St Helens (26m asl) Work: Manchester (75m asl)
A TWO addict since 14/12/01
"How can wealth persuade poverty to use its political freedom to keep wealth in power? Here lies the whole art of Conservative politics."
Aneurin Bevan
Retron
27 July 2024 16:38:49
MetO now shows another heatwave, going by their 28 for 3 days criteria for London... Heathrow now has 28/30/30 for Tuesday to Thursday.

Even here it's 27/28/28 respectively, which would give us our second (and unwelcome, to me at least) heatwave of the summer.

As ever, it looks like being very humid with it too - dewpoints of 18.5 modelled on the MetO raw, 17 on the GFS. GFS, of course, has a nasty habit of undercooking both temperatures and dewpoints...

Hopefully anyone who a) wants heat for whatever reason and b) has a UK holiday next week will have picked the SE for their travels!
Leysdown, north Kent
Saint Snow
27 July 2024 16:55:22
All the models go with the scenario of a low moving over the UK next Friday and sitting there (GFS has it doing so for the entire following week), just spinning its filthy ass round and round, dumping rain and dragging in cold air.



Martin
Home: St Helens (26m asl) Work: Manchester (75m asl)
A TWO addict since 14/12/01
"How can wealth persuade poverty to use its political freedom to keep wealth in power? Here lies the whole art of Conservative politics."
Aneurin Bevan
Retron
27 July 2024 17:07:26

All the models go with the scenario of a low moving over the UK next Friday and sitting there (GFS has it doing so for the entire following week), just spinning its filthy ass round and round, dumping rain and dragging in cold air.

Originally Posted by: Saint Snow 


The MetO output shows 25 and sunny intervals for next Friday here, and 24 and sunny intervals for next Saturday, which is as far out as it goes - both days warmer than average. Or, in other words, the models don't all show what you mention, at least for the SE chunk of the UK, even Reading, halfway to Wales from here, still has 25/23 respectively.

https://www.metoffice.gov.uk/weather/forecast/u10skvs08#?date=2024-08-03&forecastChoice=weather 

And for the 5 days before next Friday, warm at a minimum, very warm or hot on some of the days, loads of sun and humid with it.

(And the GFS still underestimates temperatures, woefully so. GFS forecast here for 6PM today? 19C. MetO? 23C. Reality? 24.7!)



Leysdown, north Kent
Saint Snow
27 July 2024 18:55:12
I was talking generally for the UK. There'll always be corners of the country that buck the majority trend.

FWIW, where I'm going to be staying, Met Office has 21c max and cloudy with 30% of rain all through the day for both Friday and Saturday.

Not exactly weather to encourage an afternoon on the beach...

Martin
Home: St Helens (26m asl) Work: Manchester (75m asl)
A TWO addict since 14/12/01
"How can wealth persuade poverty to use its political freedom to keep wealth in power? Here lies the whole art of Conservative politics."
Aneurin Bevan
Retron
28 July 2024 04:16:16

I was talking generally for the UK. There'll always be corners of the country that buck the majority trend.

FWIW, where I'm going to be staying, Met Office has 21c max and cloudy with 30% of rain all through the day for both Friday and Saturday.

Not exactly weather to encourage an afternoon on the beach...

Originally Posted by: Saint Snow 


It's a bit more than just a "corner", but we'll agree to disagree on that one I guess. (Even Great Yarmouth, 90 miles north of here, has the same picture as down here in relative terms).

You don't pick the SW for warmth, btw, being a peninsula stuck out into the ocean, and it genuinely baffles me why it's so popular with sun-seekers... if that's what you're after it's a guaranteed disappointment. You pick it for its scenery and mix of rocky and sandy beaches rather than the climate!

You're far better off in the SE, which again has always been the case - Eastbourne used to trade on being the sunniest resort in the UK, and as you'll know we get the warmest conditions in general - along with the humidity too. The sea is shallower too, so heats up very quickly (SSTs are 19C off Sheppey, for example, 18C off Eastbourne, compared to as low as 14C off north Cornwall -
https://www.meteociel.fr/accueil/sst.php  )

The MetO still has 30s this morning, and I fully suspect another 31 if not 32 will be found somewhere in the London area on Wednesday.

Beyond that, GFS does what it's done through the summer, showing some heavy rain, while MetO shows nothing but the odd bit of cloud... and, as usual, GFS is a couple or more degrees below the MetO output generally. GFS has temperatures a degree either side of the mean, while MetO is resolutely above, only reaching normal by next Sunday. And that, of course, is never going to be the most accurate forecast... I mean who would take a T+180 chart as gospel? Not many, I'd wager!

Leysdown, north Kent
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