Adjusting for the GFS underestimation of daytime max temps, perhaps a full week at least? Friday to Friday on the latest GFS looks easily capable of 7+ consecutive 30C+ days.

Wisley, Cambridge, Kew, Brogdale. 

Basically our official weather station network is so sparse most of our stations are at civil or military airfields, universities and botanical gardens. We don’t even have many in city centres anymore. 

Indeed, September is usually a summery month these days.

The astronomical seasons (21 Jun - 21 Sep and so on) have a lot to commend them. 

ECM consistent with other output this evening with next weekend looking hot. Mid thirties achievable by next Sunday...

ECM must be approaching a 40c run. Astonishing sustained heat.

That ECM op run is quite astonishing.

ECM next Sunday....you can add a couple of degrees to this.

It shows 37c for next Sunday you can normally add 2c or 3c to that. Crazy.

ECM and GFS 12z runs are officially in the [insert favourite expletive] hot category for most of England and parts of Wales.

I'm more skeptical of GFS' heatwave longevity than ECM's peak of the heat, which is saying something considering how high that is! 

It is just another wibble from the models.

For a moment I thought I’d stumbled into the Covid-19 thread.

No problem achieving social distancing there.

With each passing year I wish more and more I didn't understand some climate science...

Nah just an illustration to depict insanity. Because that's what the models have gone and done. They have flipped.

Or perhaps our climate has. I'm not saying the ECM will verify like that, but we've just achieved nearly 38C from a one-day wonder of heat. Next weekend could see consecutive days with similar uppers. 

Insane models, insane climate 

Edit: ECM 12z was an outlier at the end, when it got insanely hot. The mean suggests significant heat is on the way though

It's a good point about the health implications of a significant heatwave, to be honest.

Worth keeping and eye on pollution and pollen levels as well as temperatures nearer the event.

The London ensembles show that the op was only at the top end of the spread on Sunday 9th; not strictly an outlier. Five days in a row at or above 30c with the mean at or above 30c on two days and the potential for 35c

Even the normally sober MetO has 35 & 36 C for Heathrow (as one example) next Fri & Sat. For those who can't remember that year, welcome to 1976. Good comparison here https://www.bbc.co.uk/news/uk-44943672 - 1976 had 15 consecutive days above 32C.

Early report today as we are going to visit our daughter; ECM based on yesterday's 12z.

Jetstream W-ly for  couple of day, then fragmenting before a burst from the S Fri 7th. Then it fragments again and disappears before another burst from the S (as part of a meander) Fri 14th. Looking to resume W-ly quite strongly Tue 18th

GFS very much in line with jetstream - W-lies at first until switching to S/SW flow Thu 6th bringing up the plume and heat. Then ridge from Norway to Scotland with continental LP affecting the S until Thu 13th when Atlantic LP approaches - still warm/hot for the SE but NW cooler. By Tue 18th that LP is beginning to enforce westerlies widely.

GEFS - from Wed 5th mean temps in S well above normal almost to end of runs, peak about 7C above norm Sat 8th. Mean finally back near norm Sun 16th though op & control remain high. Little rain, just a few isolated spikes later on. Temps in Scotland & N England less exaggerated, even a bit of a dip to normal around Mon 10th. Central Scotland mainly dry, morreular rain N & S of this, esp N England.

ECM 12z quite similar to GFS

ECM this morning still very hot Friday and Saturday mid to high 30s I should think . Then looks quite thundery for a bit followed by another plume late on.