The Weather Outlook

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TimS
  • TimS
  • Advanced Member
09 July 2025 11:07:50

GFS 06z at 288hrs and looking like it’s limbering up for a cheeky second heatwave at the end of the run. 

Originally Posted by: TimS 

Yep, sure enough. Followed by another lookalike breakdown. 


Brockley, South East London 30m asl
Brian Gaze
09 July 2025 11:17:34
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Brian Gaze

Berkhamsted

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"I'm not socialist, I know that. I don't believe in sharing my money." - Gary Numan

Rob K
09 July 2025 11:50:22

UKV still going for 36/35 at the weekend. It's also showing some convection bubbling up in the heat, before more organised rain tries to nudge in from the west next week.


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

Chunky Pea
09 July 2025 11:55:03

UKV still going for 36/35 at the weekend. It's also showing some convection bubbling up in the heat, before more organised rain tries to nudge in from the west next week.

Originally Posted by: Rob K 

That convection itself may prevent temps reaching such dizzying heights. 


Patrick,

East Galway, Ireland.

warrenb
09 July 2025 11:56:50

On the 6z, at least the blip is during the week and not the weekend like happened on weekend just gone.


fairweather
09 July 2025 12:59:48

Brian, the activity is caused by one member (apt), and the subsequent replies from those stating what the charts are actually showing. It’s a real shame that it’s not all about the coming heatwave, but as much about someone’s ramblings, but I suppose it’s entertaining and generates site traffic. 

Still looking like we could get the highest temps in this area, and possibly as high as 34c. The tv forecasts are stating 32c here for the weekend, and at a few days out can often undercook (no pun intended) the actual temps by a degree or two 

Originally Posted by: Matty H 

It's the weather models. Alterntaive views should always be available because we know how wrong they can be. You will have noted that everybody is wishcasting to an extent with false optimism and pessimism thrown in. I note in winter you are in trouble if you suggest the end of a potential cold spell and in summer if you hint a heatwave might not happen !


S.Essex, 42m ASL
Hungry Tiger
09 July 2025 13:03:42

Looking at the models in depth with Kent and this weekend to mind while I was putting together my own forecast for my Facebook group (titled The Cloud Master), it is looking like a north east airflow is likely to prevent temperatures from getting any higher than 25 C here at my coastal location of Folkestone, but will still be fine and sunny. That suits me fine. It seems South Wales/western parts of Southern England are going to be the hot spots over the weekend and into Monday before the breakdown arrive (but that breakdown part is being said in low confidence).  

PS: I'm missing my fellow Kent weather forecaster sensei that is Steve "Gusty" Wall as he is still in the process of recovering from his stroke. 

Originally Posted by: idj20 

I wonder how he's getting on. If he lived in my area I'd pay him a visit. 🙂🙂


Gavin S. FRmetS.

TWO Moderator.

Contact the TWO team - [email protected]

South Cambridgeshire. 93 metres or 302.25 feet ASL.



fairweather
09 July 2025 13:03:51

Just reached 24C so probably not going to be as hot as predicted. Looking at the ECM ensembles this current heatwave looks like peaking at around 29C not the 34C that was predicted a couple of days ago thankfully. Just shows how the new norm is affecting things to think of relief that it will only be 29C !


S.Essex, 42m ASL
Retron
09 July 2025 13:16:37

Just reached 24C so probably not going to be as hot as predicted. Looking at the ECM ensembles this current heatwave looks like peaking at around 29C not the 34C that was predicted a couple of days ago thankfully. Just shows how the new norm is affecting things to think of relief that it will only be 29C !

Originally Posted by: fairweather 

Both MetO and GFS had 26 here and it's currently... 25.9. A good forecast.


Leysdown, north Kent
Ally Pally Snowman
09 July 2025 13:24:34
AIFS ensembles picking up some heat spikes after the heatwave.  After Tuesday it's still up for grabs. Could be more unsettled but also significant heat could return quickly. 

https://www.wetterzentrale.de/en/show_diagrams.php?geoid=49069&model=aifs&var=2&run=6&lid=ENS&bw=1 


Bishop's Stortford 85m ASL.
Matty H
09 July 2025 13:40:38

Just reached 24C so probably not going to be as hot as predicted. Looking at the ECM ensembles this current heatwave looks like peaking at around 29C not the 34C that was predicted a couple of days ago thankfully. Just shows how the new norm is affecting things to think of relief that it will only be 29C !

Originally Posted by: fairweather 

Every forecast I have seen or read today has temperatures reaching at least 30c across numerous areas In the coming days left of this week, and in excess of that in some. 


Yate, Nr Bristol

TBFTEIARBSC

moomin75
09 July 2025 15:32:43
ICON 12z first out of the blocks and actually doesn't look bad at all, a lot more settled than previous runs. Hopefully the start of a step back from turning cooler and unsettled. I am very happy to be wrong, so hoping the other models follow suit.

UserPostedImage


Witney, Oxfordshire

100m ASL

Brian Gaze
09 July 2025 15:37:07

Most of the MOGREPS-G 06Z seem to show a ridge building in from the southwest. However, as I've pointed out before, these should be looked at in combination with the 00Z runs.

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Brian Gaze

Berkhamsted

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Downpour
09 July 2025 16:03:28

ICON 12z first out of the blocks and actually doesn't look bad at all, a lot more settled than previous runs. Hopefully the start of a step back from turning cooler and unsettled. I am very happy to be wrong, so hoping the other models follow suit.

UserPostedImage

Originally Posted by: moomin75 

I've got this weird theory this summer that we are getting weather in blocks of 3-6 days, Kieran, typically heat followed by fresher (not necessarily much wetter 'unsettled' spells). Thus, I was happy that next week looked more unsettled as that makes the following week (when I am mountain biking in the north) likely drier. 

Probably all rubbish of course. 


Chingford

London E4

147ft

moomin75
09 July 2025 16:06:18

I've got this weird theory this summer that we are getting weather in blocks of 3-6 days, Kieran, typically heat followed by fresher (not necessarily much wetter 'unsettled' spells). Thus, I was happy that next week looked more unsettled as that makes the following week (when I am mountain biking in the north) likely drier. 

Probably all rubbish of course. 

Originally Posted by: Downpour 

I'd cope with that, given I'm on a cricket tour that week, and most of my cricket games so far this season have fallen on the wet days. (Such is my woeful luck).


Witney, Oxfordshire

100m ASL

Devonian
09 July 2025 16:27:47

I'd cope with that, given I'm on a cricket tour that week, and most of my cricket games so far this season have fallen on the wet days. (Such is my woeful luck).

Originally Posted by: moomin75 

Ot (well, it's just hot, hot, hot atm) I'll be honest, rain seems to follow your cricket team around. Can you change you tour to Devon please?

moomin75
09 July 2025 16:31:38

Ot (well, it's just hot, hot, hot atm) I'll be honest, rain seems to follow your cricket team around. Can you change you tour to Devon please?

Originally Posted by: Devonian 

Haha. As luck would have it, that's exactly where I am heading. The black clouds will follow me. Expect a deluge 🤣🤣🤣


Witney, Oxfordshire

100m ASL

fairweather
09 July 2025 16:38:48

Both MetO and GFS had 26 here and it's currently... 25.9. A good forecast.

Originally Posted by: Retron 

Made 26.5C in the end late on which was good for 27C forecast. The heat is coming!


S.Essex, 42m ASL
fairweather
09 July 2025 16:44:18

Every forecast I have seen or read today has temperatures reaching at least 30c across numerous areas In the coming days left of this week, and in excess of that in some. 

Originally Posted by: Matty H 

Apologies, I forgot to mention IMBY where I think maybe a NE drift or sea breezes may be attenuating the temperatures a bit - although the ensembles I referred to were means for London.


S.Essex, 42m ASL
TimS
  • TimS
  • Advanced Member
09 July 2025 17:07:40
This evening's GFS delivers something from next week onwards that's rare as hen's teeth in modern British summer weather. In fact so rare as to be practically extinct: settled, warm (but not hot) weather across the country.  

London temperatures next Tuesday onwards: 27, 22, 27, 25, 26, 27, 28, 25, 25, 28 (to be continued). With only 5mm of accumulated rainfall.

Those are the stuff of summer 1984, or 1996, or 2005. Maybe 2014. Not the "modern British climate" - which is what the 06z delivered.  

EDIT: with a cheeky little laying of the foundations for some proper modern British climate right at the end.


Brockley, South East London 30m asl
Hungry Tiger
09 July 2025 17:16:26

This evening's GFS delivers something from next week onwards that's rare as hen's teeth in modern British summer weather. In fact so rare as to be practically extinct: settled, warm (but not hot) weather across the country.  

London temperatures next Tuesday onwards: 27, 22, 27, 25, 26, 27, 28, 25, 25, 28 (to be continued). With only 5mm of accumulated rainfall.

Those are the stuff of summer 1984, or 1996, or 2005. Maybe 2014. Not the "modern British climate" - which is what the 06z delivered.  

EDIT: with a cheeky little laying of the foundations for some proper modern British climate right at the end.

Originally Posted by: TimS 

Perfect.  🙂🙂🙂🙂


Gavin S. FRmetS.

TWO Moderator.

Contact the TWO team - [email protected]

South Cambridgeshire. 93 metres or 302.25 feet ASL.



Taylor1740
09 July 2025 17:30:49

This evening's GFS delivers something from next week onwards that's rare as hen's teeth in modern British summer weather. In fact so rare as to be practically extinct: settled, warm (but not hot) weather across the country.  

London temperatures next Tuesday onwards: 27, 22, 27, 25, 26, 27, 28, 25, 25, 28 (to be continued). With only 5mm of accumulated rainfall.

Those are the stuff of summer 1984, or 1996, or 2005. Maybe 2014. Not the "modern British climate" - which is what the 06z delivered.  

EDIT: with a cheeky little laying of the foundations for some proper modern British climate right at the end.

Originally Posted by: TimS 

If that came off which it probably won't, then mine and Moomins' 'ridiculously unlikely' sub 18c CET (which we haven't predicted just said is possible) might still actually have a chance of happening!


NW Leeds - 150m amsl
TimS
  • TimS
  • Advanced Member
09 July 2025 17:41:03

If that came off which it probably won't, then mine and Moomins' 'ridiculously unlikely' sub 18c CET (which we haven't predicted just said is possible) might still actually have a chance of happening!

Originally Posted by: Taylor1740 

Notably, on the ensemble it’s both a cool outlier and a high pressure outlier. 


Brockley, South East London 30m asl
doctormog
09 July 2025 17:42:17

If that came off which it probably won't, then mine and Moomins' 'ridiculously unlikely' sub 18c CET (which we haven't predicted just said is possible) might still actually have a chance of happening!

Originally Posted by: Taylor1740 

Out of curiosity who is the quote from? Secondly, the value stated was 17°C to 17.5°C after having original been a “cool July” and then “cooler second half of the month”. The sound of goalposts being moved is almost deafening.

Also in context the t2m values for the GFS 12z run  were right at the lower end of the range of the ensemble suite. Is it really more important to cherry pick selected data to try and prove a point than it is to look at all the output? 


TimS
  • TimS
  • Advanced Member
09 July 2025 17:46:46

GEM’s 12z effort delivers a sub-zero CET and 2 feet of snow for London (if it were January).


Brockley, South East London 30m asl

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