Donna Nook was not an error and is in fact absolutely fascinating...

https://twitter.com/metoffice/status/1154527667980402688?s=20

Yes was just reading that tweet. Apparently it's a phenomenon known as a "heat burst".

https://en.wikipedia.org/wiki/Heat_burst

The BBC have reported yesterday's highest temperature in Edinburgh (which is officially our highest ever recorded temperature for here in Edinburgh) to have been 31.6°C without identifying which actual station this was recorded at.

A local newspaper has quoted the same temperature for yesterday here in Edinburgh, and has pointed out Edinburgh Gogarbank as the station where that reading was recorded. This report even goes on to say that this was later confirmed by the Met Office.

Yet, the data from www.weathercast.co.uk shows yesterday's maximum temperature at Edinburgh Gogarbank to have been 30.9°C (which is what I have therefore, reported on the last CC thread on this forum as yesterday's maximum) and this is also backed up by the Met Office Observations website.

A tweet on the BBC Scotland Weather Twitter account even reported at 3pm (when that reading was recorded) that the highest recorded temperature in Edinburgh was 30.9°C as per that maximum value at Edinburgh Gogarbank which I reported on this forum.

That in turn, leads me to wonder where that other figure of 31.6°C came from which was later confirmed as the actual record. Now, data at both www.weathercast.co.uk and the Met Office Observations website is only ever reported on the hour, every hour and it is out of that data where that maximum value of 30.9°C comes from.

If the actual official record is 31.6°C though, this means that yesterday's maximum temperature at Edinburgh Gogarbank must have actually been 31.6°C, and not the value of 30.9°C which is highest hourly value for that station during yesterday.

There is a difference of 0.7°C between those two values, so that higher value which has been reported as the official record must have come about from some sort of upwards adjustment, or from other data which is produced from that station in between those hourly readings, but which is never actually publicly released.

Furthermore, this higher temperature must have occurred at some time after 3pm, as that lower value of 30.9°C would probably have been the actual highest temperature of the day so far at the time of that above mentioned tweet.

Should think the 24 hours CET record is well and truly up for grabs.

It's still 25C here.

Just edited my list of 35C+ maxima to include Wellesbourne 36.2C and Sheffield 35.6C, from Met Office data.

The BBC have reported yesterday's highest temperature in Edinburgh (which is officially our highest ever recorded temperature for here in Edinburgh) to have been 31.6°C without identifying which actual station this was recorded at.

A local newspaper has quoted the same temperature for yesterday here in Edinburgh, and has pointed out Edinburgh Gogarbank as the station where that reading was recorded. This report even goes on to say that this was later confirmed by the Met Office. 

It's quite straightforward, 30.9C was the highest hourly reading but the actual max, which of course is unlikely to fall precisely on an hourly reading, was 31.6C. The Met Office "last 24 hours" obs page confirms that the 31.6C was Gogarbank. https://www.metoffice.gov.uk/public/weather/observation/map/gcvwr3zrw#?zoom=6&lat=54.69&lon=-4.00&map=WeatherCode&fcTime=1564052400

The daily max is usually only publicly released with the 6pm (UTC, ie 7pm in summer) SYNOP reading, which as well as the 6pm temperature also includes the daily maximum (and similarly the 6am SYNOP includes the overnight minimum). Hence why 30.9C would have been reported until the true max was known after 7pm.

 

Donna Nook was not an error and is in fact absolutely fascinating...

https://twitter.com/metoffice/status/1154527667980402688?s=20

And the heat burst gave the highest temp of the day by more than 6 degrees! The 6am-6pm max was 26.1C.

 

It's quite straightforward, 30.9C was the highest hourly reading but the actual max, which of course is unlikely to fall precisely on an hourly reading, was 31.6C. The Met Office "last 24 hours" obs page confirms that the 31.6C was Gogarbank. https://www.metoffice.gov.uk/public/weather/observation/map/gcvwr3zrw#?zoom=6&lat=54.69&lon=-4.00&map=WeatherCode&fcTime=1564052400

 

The daily max is usually only publicly released with the 6pm (UTC, ie 7pm in summer) SYNOP reading, which as well as the 6pm temperature also includes the daily maximum (and similarly the 6am SYNOP includes the overnight minimum). Hence why 30.9C would have been reported until the true max was known after 7pm.

 

Thanks for that, as I wouldn't have thought about checking the last 24 hours page on the Met Office site after 7pm to find out what the true maximum temperature actually was before reporting that on the daily CC threads (which would therefore, be the more accurate way of doing that).

Nevertheless, that is something to remember for the future as this will also apply to whatever I report for the botanic gardens in Edinburgh as well.

Reached 37C (99F) here in rural W. Northants making it the hottest day here since 3rd August 1990  

Still 21C and not a breath of wind (hence why I'm still awake and posting on here at 1:30am haha) 

Reached 37C (99F) here in rural W. Northants making it the hottest day here since 3rd August 1990  

Still 21C and not a breath of wind (hence why I'm still awake and posting on here at 1:30am haha) 

Since you do storm watch, snow watch and rain watch videos, I am wondering whether or not it might be a good idea to add heat watch videos that list in this sort of scenario.

In this case, it might even have been good if such a heat watch video had been produced along with your last storm watch video as one single video combining those two elements.

That is particularly true since this is an instance where the heat watch part of that came off really well (the fact that Edinburgh had its hottest day on record is itself, evidence of that) whereas the storm watch part of this has been a virtual non-event here (the latest radar map shows that there is not a single thunderstorm to be seen anywhere in Scotland as I write, with virtually the entire country being completely dry despite the fact that we are still under an official Met Office yellow warning for those thunderstorms).

Just edited my list of 35C+ maxima to include Wellesbourne 36.2C and Sheffield 35.6C, from Met Office data.

Sheffield at 35.6c is possibly  the joint Yorkshire and Northern record, tied with Bawtry at 35.6c in September 1906.  

That Donna Nook reading is incredible, I saw it last night and assumed error.  People must have been confused, one minute it was 22c with a nice sea breeze then it rises to a tropical 32c. 

Would be nice to know which stations broke their all time records.  Round here Bingley,  Bradford and Sheffield too. Perhaps Linton on ooze and Ryhill also. 

 

And the heat burst gave the highest temp of the day by more than 6 degrees! The 6am-6pm max was 26.1C.

 

 

What a fascinating event. Well done to Quantum for flagging this earlier in the thread.

 

Donna Nook was not an error and is in fact absolutely fascinating...

https://twitter.com/metoffice/status/1154527667980402688?s=20

Indeed. Never seen that before. It seemed very unlikely the temperature would shoot up to 32C in one isolated location at 10pm. I won’t be quite so quick to dismiss apparently erroneous readings in future.

No record minimum it would seem. Highest temperature at 0500 was 23.5C at Loftus Samos

 

Indeed. Never seen that before. It seemed very unlikely the temperature would shoot up to 32C in one isolated location at 10pm. I won’t be quite so quick to dismiss apparently erroneous readings in future.

I read about heat bursts alongside intense thorms in the States;there was a rise from 20s C to over 40C in one; in another (unofficially recorded) the temperature is said to have shot up to over 50C and it damaged a corn crop. 

 

Yes was just reading that tweet. Apparently it's a phenomenon known as a "heat burst".

https://en.wikipedia.org/wiki/Heat_burst

Saw that in Nicosia, Cyprus in 1989 when it was 28C max then drop to 20C in the evening before rising to 28C again in strong gusty winds.  Fell to 14C by morning.  I never experience that since then or in here yet.

 

Donna Nook was not an error and is in fact absolutely fascinating...

https://twitter.com/metoffice/status/1154527667980402688?s=20

This is a truly amazing weather phenomenon. 

I'll leave this thread open for any posts looking back at Hot Thursday, or if any more records relating to the 25th come to light including overnight lows and heat bursts.

Please use the now unlocked High Temperature reports thread for anything relating to Friday 26th and onwards.

Perhaps we should archive the Historic Heat Watch in a few days' time?

I'll leave this thread open for any posts looking back at Hot Thursday, or if any more records relating to the 25th come to light. Please use the now unlocked High Temperature reports thread for anything relating to Friday 26th and onwards.

Perhaps we should archive the Historic Heat Watch in a few days' time?

Sounds like a good idea. 

PS: There is still a possibility the all time record went yesterday because not all data has been analysed yet. We should hear from Brogdale this morning I am told.

 

I read about heat bursts alongside intense thorms in the States;there was a rise from 20s C to over 40C in one; in another (unofficially recorded) the temperature is said to have shot up to over 50C and it damaged a corn crop. 

I heard of one (Portugal I think) where the temp briefly reached 70C.

Looks like the highest minimum on the SYNOP network was 22.6C at Loftus Samos. There are other stations, of course.

Looking at all the max data from yesterday, although we seem to have just missed out on the all-time record (or tied it, if you discount Brogdale, which when analysed was considered to be unrepresentative by a about 2C!) there must be a good chance that it was the hottest day in England overall in history?

Not sure how you would work that out, but in terms of the widespread heat it was remarkable. Maybe the mean of all weather stations, or of course the more basic CET - was it the record daily CET, anyone?