Not as extreme. Quite a bit of scatter in the ensembles from Sunday. UKMO and GEM continue the very hot conditions for longer.

Many of the options in the GEFS do keep it fairly hot until the 13th, and that's well reflected in a mean 850 of about 13C. That being a week and a half away, I'm not perturbed by the perturbations thereafter.

Friday , Saturday and Sunday look the very hot days. With Saturday being the day my early punt is 36c to 38c but just shy of the all time record.

honestly it wouldn’t take a lot of the all time record to fall. 
amazing output over the last 24 hours, let’s see what today’s runs bring. 

06z looking even better so far.

Peak heat of at least 33-35C on this run, what’s more remarkable is the run of 30+ days.

Indeed, the 6z really prolongs the spell. Not the absolute excessive heat of Friday, but add on the usual 2-3c and we are looking at 34-35 again easily. And the run just goes on and on and only really starts breaking down out at 336 hours. Bring it on!!

MetOffice is currently foreseeing 36C on Friday and 35C on Saturday for Heathrow.

https://www.metoffice.gov.uk/weather/forecast/gcpsvg3nc#?date=2020-08-08

Even our local station at Otterbourne is given around 33C (was 34 this morning).

Reminds me more of 1997 as someone has said, with underflavours of 95 in some runs only (repeated 30+ days). 

Some runs suggest a week's worth of minima at or above 20 in the south.

My abiding memory of August 1997 was the high humidity and very warm nights. Day temperatures in the high 20s (and a few low 30s) for a long period.

Are we looking at an August 1995 here I wonder.

A while ago I was explaining to somebody why I was loathe to mention the possibility of record breaking temperatures. Essentially talking about a possibility can rapidly be translated by some sections of the media into a prediction. Even given the background levels of warmth my view was that the chance of a max temperature record in any given year remained very low. Now I'm rethinking that. We seem to be reaching the stage where you can take a punt on new records being set and have a reasonable chance of getting it right. The weather rule book is being ripped up. Forecast models are tending to under-predict maximums in the same way as they suggest minimum values which are often too low. Therefore, all eyes on the model output in the coming days. If the UK max temperature record falls this August I will do nothing more than raise an eyebrow.

Feels more 2003 to me. Intense heat, but not coming at the end of a long dry summer. Grass was still green at the end of July 2003, though yellow by the end of Aug.

Grass here has been yellow since June. It's been rather dry here in the south.

Oddly the totals around Portsmouth for June look similar to my part of London. Maybe July was wetter in the SE than S as the grass greener up by early in the month. Or maybe the clay soil here retains moisture more.

Yes. I agree about the rule book. We used to talk about a good few days of heat build and dry soils. Last week put that to bed.

FWIW I think we will break the all time record next week.

July has been dry. Regards to June we had a few wet day's but also a lot of dry day's and sunny weather which meant any rain was quickly evaporated up. It wasn't until the back end of June that the grass started to turn.

It was the heatwave of early August 2003 which, IMO, is why that summer is held in such high regard by many. June and July 2003 both saw some very warm/hot spells but nothing which lasted an overly long time from what I recall. The August heatwave was the only really sustained one that summer for most of the UK and at the time, it reminded me very much of the same period in the summer of 1995.

Hot UKMO, GFS loses the heat Sunday but id imagine it'll be a cool outlier.

GEM loses the heat signal as well although is very settled.

It is a significant cool outlier as you suspected. 

Big ECM coming up 😎

All bets off with these. 

Indeed very much a cool outlier . Most ensembles remain hot for at least a week.

The UKMO 12z at 144hrs also shows a bit of a cool off as far as I can see, as an area of HP moves in from the atlantic with a cooler NW airflow ahead of it.

Also, Stav Danaos of the BBC did say during the week ahead forecast at 1:15pm today that the current thinking is that temps would cool off a bit during next weekend. We shall see what transpires.