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Online Heavy Weather 2013  
#1 Posted : 25 July 2019 05:18:25(UTC)
Heavy Weather 2013

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Posts: 1,294
Location: Muswell Hill, North London

So hope this is OK Mods. Appreciate we a few threads but with an historic day potentially ahead it would be good to have this for the classic thread. Normality can return tomorrow!


Eyes down for what could be a historic day.


Will we break the hottest July day ever recorded at 36.7C or will go a step further and break the UK record that has stood since that historic day 15 years ago when we achieved 38.5C


We are already 1C ahead of yesterday at 22C I suspect the rise this morning will be quick and spectacular. I’d like to be seeing 27C-28C at 8am

Mark
Stratford, London

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Offline DEW  
#2 Posted : 25 July 2019 05:44:06(UTC)
DEW

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Location: Chichester 12m. asl

It's all very exciting, but there's a danger of getting too many threads so that no-one can find anything. I agree that today's weather is likely to spawn an extraordinary number of posts so useful to have them all in one thread. May I recommend the following protocol:


Historic Heat watch - actual reports from anywhere of temps today 25th July


High temp reports  - suspended for now, will re-open tomorrow


Potential record breaker - speculation as to where things will happen next


Current conditions - actual reports from where you are now unless meriting a post in Historic heat Watch


Convection thread  - reports of storms and their development


Model output thread - developments over the next few days

Edited by user 25 July 2019 05:50:51(UTC)  | Reason: Not specified

It was most foule weather ... and so we went into an alehouse - Samuel Pepys
Offline Rob K  
#3 Posted : 25 July 2019 05:45:40(UTC)
Rob K

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Posts: 20,965
Location: Northeast Hampshire

Here are the hourly readings at Heathrow from the existing record day, Aug 10 2003.

https://www.ogimet.com/c...8&day=10&hora=18

Times are in UTC so add an hour for BST. We want to be seeing 30C+ by the 10am point to be ahead of the game.
Yateley, NE Hampshire, 73m asl.
Offline TimS  
#4 Posted : 25 July 2019 05:47:45(UTC)
TimS

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Location: Brockley

Already 27C in a couple of spots in Paris at 7.30am CEST. That airmass is heading our way.
Brockley, South East London 30m asl
Online Heavy Weather 2013  
#5 Posted : 25 July 2019 05:48:14(UTC)
Heavy Weather 2013

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Location: Muswell Hill, North London

Originally Posted by: Rob K Go to Quoted Post
Here are the hourly readings at Heathrow from the existing record day, Aug 10 2003.


Times are in UTC so add an hour for BST. We want to be seeing 30C+ by the 10am point to be ahead of the game.


Thanks for posting Rob. If I am reading that correctly we could be already ahead of schedule. I’ve got 23C here already at 06:50

Edited by user 25 July 2019 05:49:31(UTC)  | Reason: Not specified

Mark
Stratford, London
Offline Rob K  
#6 Posted : 25 July 2019 05:52:05(UTC)
Rob K

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Reposting POD’s post from the other thread


Interesting readings at 06:00.

LHR 20.8c

Charlwood 16.2c

Wych Cross 23.7c

Kenley 24.1c

Must be a height asl event
Yateley, NE Hampshire, 73m asl.
Offline Retron  
#7 Posted : 25 July 2019 05:54:12(UTC)
Retron

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Location: Leysdown-on-Sea

Sounding at midnight from Herstmonceaux:

http://weather.uwyo.edu/cgi-bin/sounding?region=europe&TYPE=GIF%3ASKEWT&YEAR=2019&MONTH=07&FROM=2500&TO=2523&STNM=03882



(Note that at 1000ft or so it was around 26C - the shallow inversion shows up very well).

Compared to 2003 the layer of exceptionally hot air is shallower and cooler.

http://weather.uwyo.edu/cgi-bin/sounding?region=europe&TYPE=GIF%3ASKEWT&YEAR=2003&MONTH=08&FROM=1000&TO=1000&STNM=03882


(EDITED as I mixed up the 20 and 25C lines, stupidly!


And again. I must be half-asleep, I blame the crap weather recently!)


 

Edited by user 25 July 2019 05:58:01(UTC)  | Reason: Not specified

Offline Retron  
#8 Posted : 25 July 2019 05:59:39(UTC)
Retron

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Offline Rob K  
#9 Posted : 25 July 2019 06:08:07(UTC)
Rob K

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Location: Northeast Hampshire

At 7am (i.e. the 05.50Z SYNOP reading) Heathrow is at 23.0C. In 2003 it was 20.9C, with 23.0C being reached exactly one hour later.

Darren, I thought the upper air was a lot hotter this time around? Models suggest close to 24C at 850mb which would even beat the record from last month, wouldn’t it?

Yateley, NE Hampshire, 73m asl.
Offline TimS  
#10 Posted : 25 July 2019 06:08:33(UTC)
TimS

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Location: Brockley

Originally Posted by: Retron Go to Quoted Post


Sounding at midnight from Herstmonceaux:

http://weather.uwyo.edu/cgi-bin/sounding?region=europe&TYPE=GIF%3ASKEWT&YEAR=2019&MONTH=07&FROM=2500&TO=2523&STNM=03882



(Note that at 1000ft or so it was around 26C - the shallow inversion shows up very well).

Compared to 2003 the layer of exceptionally hot air is shallower and cooler.

http://weather.uwyo.edu/cgi-bin/sounding?region=europe&TYPE=GIF%3ASKEWT&YEAR=2003&MONTH=08&FROM=1000&TO=1000&STNM=03882


(EDITED as I mixed up the 20 and 25C lines, stupidly!


And again. I must be half-asleep, I blame the crap weather recently!)


 



Big difference from 2003 is that hot upper had peaked and was on its way down through the afternoon, whilst today the hottest air is not here yet. Should be with us early afternoon. I think the soundings will evolve quite dramatically through the day.

Brockley, South East London 30m asl
Offline Tim A  
#11 Posted : 25 July 2019 06:12:13(UTC)
Tim A

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Location: Leeds

Going to be an intriguing day. Hoping for something historic here and look forward to reading others reporting, hopefully experiencing the Max UK temp ever.

Max temps I have recorded in this general area are 32c in my childhood close to here, and 30.7c at my current location in 2015.

1990 - I was 6 years old but remember the intense heat . 34.4c in Leeds. I remember the next day being glued to the Guardian weather reports looking at the maximum temperatures readings for the previous day across the country.

2003 - Was a student without a care in the world. Had to log onto the PC to get weather updates and of course TWO was here. 9th August was hotter here but was fun watching other reports from the SE on the 10th.

2015 - I was in a Corfu where it was a cool 26c, so missed it but TWO kept me informed.

2019 - Smart phones now can access everything from anywhere. Loads of data and reports to be fixated on today.

Edited by user 25 July 2019 06:14:44(UTC)  | Reason: Not specified

Tim
NW Leeds (1 mile east of LBA)
187m asl
Offline eddied  
#12 Posted : 25 July 2019 06:12:39(UTC)
eddied

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Location: Reigate, Surrey - 105m ASL

Originally Posted by: Rob K Go to Quoted Post
Reposting POD’s post from the other thread


Interesting readings at 06:00.

LHR 20.8c

Charlwood 16.2c

Wych Cross 23.7c

Kenley 24.1c

Must be a height asl event


It’s been interesting(ish) how Charlwood has been having consistently cool starts during this heatwave. Soil or morning mist from local rivers I wonder... It soon catches up and ends up a couple of degrees of the hotspots. 


Like you I’m looking at the 10am 30C+ as the first checkpoint today. Certainly some beautiful clear blues skies here to kick the day off. Stay cool everyone 😎 

Location: Reigate, Surrey 105m ASL
Summer max so far: 36C at home, 38C at work
Offline Rob K  
#13 Posted : 25 July 2019 06:14:18(UTC)
Rob K

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Joined: 02/05/2006(UTC)
Posts: 20,965
Location: Northeast Hampshire

Yes the skies are crystal clear here. There was quite a lot of high cirrus and contrails around yesterday evening but that has disappeared overnight.
Yateley, NE Hampshire, 73m asl.
Online Heavy Weather 2013  
#14 Posted : 25 July 2019 06:15:46(UTC)
Heavy Weather 2013

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Originally Posted by: Rob K Go to Quoted Post
Yes the skies are crystal clear here. There was quite a lot of high cirrus and contrails around yesterday evening but that has disappeared overnight.


I woke up at 5:30am a panicked when I saw a few wisps. I’m on tenterhooks.

Mark
Stratford, London
Online Heavy Weather 2013  
#15 Posted : 25 July 2019 06:19:01(UTC)
Heavy Weather 2013

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Posts: 1,294
Location: Muswell Hill, North London

My iPhone App has just pushed the forecast temperature today to 39C.
Mark
Stratford, London
Offline White Meadows  
#16 Posted : 25 July 2019 06:27:25(UTC)
White Meadows

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Location: West Sussex

Originally Posted by: Heavy Weather 2013 Go to Quoted Post
My iPhone App has just pushed the forecast temperature today to 39C.
Wasn’t there supposed to be a dedicated thread for iPhone app temps?

Offline Rob K  
#17 Posted : 25 July 2019 06:29:23(UTC)
Rob K

Rank: Advanced Member

Joined: 02/05/2006(UTC)
Posts: 20,965
Location: Northeast Hampshire

Originally Posted by: TimS Go to Quoted Post


 


Big difference from 2003 is that hot upper had peaked and was on its way down through the afternoon, whilst today the hottest air is not here yet. Should be with us early afternoon. I think the soundings will evolve quite dramatically through the day.



Yes looking at the 2003 readings I think we missed out on an hour or two of extra heating really. Often Heathrow can keep rising until 5pm or even 6pm. The 2003 record came not long after 3pm I believe. 

Yateley, NE Hampshire, 73m asl.
Offline Arcus  
#18 Posted : 25 July 2019 06:29:43(UTC)
Arcus

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United Kingdom
Location: North Yorkshire

Interesting that there's showers brewing already over N. France. Could be an issue for heat seekers.
Ben,
Nr. Easingwold, North Yorkshire
30m asl

It sounds like a class rant but it’s really because
I am the landlord of the pub that gets the cemetery trade

Offline Rob K  
#19 Posted : 25 July 2019 06:34:03(UTC)
Rob K

Rank: Advanced Member

Joined: 02/05/2006(UTC)
Posts: 20,965
Location: Northeast Hampshire

Weird... the Heathrow 7am reading has changed from 23.0C to 24.0C now!
Yateley, NE Hampshire, 73m asl.
Offline Caz  
#20 Posted : 25 July 2019 06:42:01(UTC)
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Location: Market Warsop, Nottinghamshire, East Midlands

Originally Posted by: DEW Go to Quoted Post


It's all very exciting, but there's a danger of getting too many threads so that no-one can find anything. I agree that today's weather is likely to spawn an extraordinary number of posts so useful to have them all in one thread. May I recommend the following protocol:


Historic Heat watch - actual reports from anywhere of temps today 25th July


High temp reports  - suspended for now, will re-open tomorrow


Potential record breaker - speculation as to where things will happen next


Current conditions - actual reports from where you are now unless meriting a post in Historic heat Watch


Convection thread  - reports of storms and their development


Model output thread - developments over the next few days


Potential record breaker thread has been locked.  

Market Warsop, North Nottinghamshire.
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