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September UK temperature analysis and discussion
Rank: Advanced Member
Joined: 11/04/2006(UTC)
Posts: 25,840
Location: South Cambridgeshire
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Originally Posted by: Stormchaser  Been quite the run of days for CET projections. For a while there were some bonkers GFS runs giving me estimates of more than 18.0°C for the middle days of the month. Not for the daily returns, the mean-to-date! Would be record high for that point in the month. Anyway, since then GFS has freshened up the weekend and has only intermittent very warm weather thereafter, so CET estimates aren't so eye-watering. They're still notably high though, owing to the impressive very warm / hot spell we're currently in and a lack of sustained switch to a cool pattern in most runs. ECM was going for warmer but more unsettled outcomes than GFS yesterday but has moved close to it today. Sunday morning could feel decidedly cool as some polar maritime air moves though on a light breeze. It soon warms up the following week, though. Generally I'm not seeing anything that would force a sustainably cool or very cool pattern to establish within the next fortnight. I'm starting to suspect I may have estimated too low for this month - but then again, I thought that about halfway through last month and...!   
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Rank: Advanced Member
Joined: 14/07/2012(UTC) Posts: 30,250  Location: Peasedown St John. N.E. Sommerset
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Met Office Hadley 17.4c Anomaly 2.7c Metcheck 16.50c Anomaly 2.8c Netweather 17.36c Anomaly 3.66c Peasedown St John 17.51c Anomaly 3.23c. |
Some people walk in the rain. Others just get wet. I Just Blow my horn or trumpet
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Rank: Advanced Member
Joined: 14/07/2012(UTC) Posts: 30,250 Location: Peasedown St John. N.E. Sommerset
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Met Office Hadley 18.0c Anomaly 3.3c provisional to 8th Metcheck 17.07c Anomaly 3.34c Netweather 17.86c Anomaly 4.17c Peasedown St John 17.48c Anomaly 3.2c. |
Some people walk in the rain. Others just get wet. I Just Blow my horn or trumpet
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Rank: Advanced Member
Joined: 10/06/2016(UTC) Posts: 4,900 Location: Blackrod, near Chorley, Lancs - alt: 156m
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Still early days, but could this be another instance where September is warmer than the August before it? The last time it happened was in 2014: August was 14.9 and September was 15.1. |
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Rank: Advanced Member
Joined: 20/11/2015(UTC)
Posts: 6,868
Location: Central Southern England
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Originally Posted by: Bolty Still early days, but could this be another instance where September is warmer than the August before it? The last time it happened was in 2014: August was 14.9 and September was 15.1. I've popped through some of the hot early Septembers and I can't see one since 1868 with a hotter first 8 days- I'm sure someone else can spot one- mean daily CET that is. As we saw early in the month it can change at the drop of a hat though. |
Bertie, Itchen Valley. August 2020: best heatwave since '95 |
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Rank: Advanced Member
Joined: 05/04/2006(UTC) Posts: 5,131
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Originally Posted by: Bertwhistle I've popped through some of the hot early Septembers and I can't see one since 1868 with a hotter first 8 days- I'm sure someone else can spot one- mean daily CET that is. As we saw early in the month it can change at the drop of a hat though. HadCET has 17.95C for the 1st 8 days of this month as provisional data When I analysed my Access DB for daily CET Mean I got some higher ones for Sept1-8 2005 17.96 1999 17.98 1795 18.01 1898 18.35 1906 18.68 (Haven't desk checked them though !) But this last week has been up there (but if you look at the September predictions you might see why I have not quite treated it like the pleasant surprise it is ) |
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Rank: Advanced Member
Joined: 20/11/2015(UTC)
Posts: 6,868
Location: Central Southern England
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Originally Posted by: lanky HadCET has 17.95C for the 1st 8 days of this month as provisional data When I analysed my Access DB for daily CET Mean I got some higher ones for Sept1-8 2005 17.96 1999 17.98 1795 18.01 1898 18.35 1906 18.68 (Haven't desk checked them though !) But this last week has been up there (but if you look at the September predictions you might see why I have not quite treated it like the pleasant surprise it is ) I think my maths, eyesight or ability to read have gone Martin (or more probably, all three!)  
Edit: just looked at 1906 again and realised I was scanning down the August column in Hadley- it was a near but not quite! Need to go back now as I think I may have done that for the others. Double Edited by user 10 September 2021 07:06:58(UTC)
| Reason: Stupidity |
Bertie, Itchen Valley. August 2020: best heatwave since '95 |
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Rank: Advanced Member
Joined: 14/07/2012(UTC) Posts: 30,250 Location: Peasedown St John. N.E. Sommerset
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Met Office Hadley 18.1c Anomaly 3.6c provisional to 9th Metcheck 17.21c Anomaly 3.49c Netweather 17.99c Anomaly 4.3c Peasedown St John 17.52c Anomaly 3.24c. |
Some people walk in the rain. Others just get wet. I Just Blow my horn or trumpet
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Rank: Advanced Member
Joined: 28/10/2008(UTC) Posts: 23,949   Location: Market Warsop, Nottinghamshire, East Midlands
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Originally Posted by: Bertwhistle I think my maths, eyesight or ability to read have gone Martin (or more probably, all three!)
Edit: just looked at 1906 again and realised I was scanning down the August column in Hadley- it was a near but not quite! Need to go back now as I think I may have done that for the others. Double You can be forgiven Bertie and the first ten days may prove to be a record. The mild, muggy nights are doing me no favours with sleeping. At this rate, we’ll have all gone too low with our predictions. |
Market Warsop, North Nottinghamshire. Join the fun and banter of the monthly CET competition. Discuss monthly temperatures and records.CET competition
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Rank: Advanced Member
Joined: 14/11/2011(UTC)
Posts: 1,858
Location: Bournemouth
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Looking like a 16c+ CET is pretty much nailed on now.
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Rank: Advanced Member
Joined: 28/10/2008(UTC) Posts: 23,949 Location: Market Warsop, Nottinghamshire, East Midlands
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Originally Posted by: springsunshine Looking like a 16c+ CET is pretty much nailed on now. The outlook certainly isn’t cold enough to lower it much in the foreseeable. It’s been a strange year altogether. Scotland and Ireland have had record highs and we in the middle have had a lovely summer but I know some in the the South haven’t done too well. |
Market Warsop, North Nottinghamshire. Join the fun and banter of the monthly CET competition. Discuss monthly temperatures and records.CET competition
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Rank: Advanced Member
Joined: 20/11/2015(UTC)
Posts: 6,868
Location: Central Southern England
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Originally Posted by: Caz You can be forgiven Bertie and the first ten days may prove to be a record. The mild, muggy nights are doing me no favours with sleeping. At this rate, we’ll have all gone too low with our predictions. I believe you are right Caz- although the usual adjustment will no doubt knock half a degree off. Last night continued the run of warm nights- a 3rd consecutive with a min > 16C so we might still be around the 18C mark- I'll check Art's update later. But we're not at half month yet and after the model swing at month's start, I wouldn't be surprised at anything! |
Bertie, Itchen Valley. August 2020: best heatwave since '95 |
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Rank: Advanced Member
Joined: 05/04/2006(UTC) Posts: 35,520
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Gosh, CET actually went UP another 0.1C yesterday!  I really am starting to wonder if a new record 17C CET September could be possible? Would love an update from our guru GW soon!  |
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Rank: Advanced Member
Joined: 11/04/2006(UTC)
Posts: 25,840
Location: South Cambridgeshire
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Originally Posted by: Gavin P Gosh, CET actually went UP another 0.1C yesterday! I really am starting to wonder if a new record 17C CET September could be possible? Would love an update from our guru GW soon! To do that would take some meaty hot days in the last week of the month. Don't forget that by the 21st we're in the autumn solstice and the days are drawing in at quite a rate. |
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Rank: Advanced Member
Joined: 14/07/2012(UTC) Posts: 30,250 Location: Peasedown St John. N.E. Sommerset
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Met Ofice Hadley 18.2c Anomaly 3.7c provisional to 10th Metcheck 17.32c Anomaly 3.60c Netweather 18.05c Anomaly 4.36c Peasedown St John 17.53c Anomaly 3.27c. |
Some people walk in the rain. Others just get wet. I Just Blow my horn or trumpet
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Rank: Advanced Member
Joined: 28/10/2008(UTC) Posts: 23,949 Location: Market Warsop, Nottinghamshire, East Midlands
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Originally Posted by: Hungry Tiger To do that would take some meaty hot days in the last week of the month. Don't forget that by the 21st we're in the autumn solstice and the days are drawing in at quite a rate. Ahh but (there has to be one ) the way the nights have been holding onto warmth, their length will make little difference. |
Market Warsop, North Nottinghamshire. Join the fun and banter of the monthly CET competition. Discuss monthly temperatures and records.CET competition
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Rank: Advanced Member
Joined: 24/10/2008(UTC) Posts: 12,076 Location: West Hants
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Provisional CET for 1st-10th was right up against the record high for the period (1898): https://twitter.com/peacockreports/status/1436777893766569988 Actual is probably two or three tenths lower, mind.
Still, this is proving to be a staggeringly warm month. Far more so than the models were indicating as of August's end. Good of GW to apply penalties for entries after 1st. Even on 1st there was arguably some advantage so I wish I'd held on now!
Anyway, a curious feature of this month has been GFS periodically producing a batch of runs featuring extraordinary warm spells. The 06z of today went full late Sep 2011 on us, while the 12z is more laidback but, through sheer persistence of very warm days and mild nights, gives an even higher CET estimate to 27th (dashed line on the 2nd graph in the tweet). Usually I'd toss them aside as crazed ravings, but here's the thing - GFS spotted the big plume of early this week ahead of all the other models. Not consistently, by any means, but then, it's not being consistent this time around either. So maybe it's onto something. There is one key difference, though. Before this week's hot spell, ECM was bringing changeable westerlies. Currently, it has an increasingly cool easterly (from a warm starting position in the middle of next week). So, if GFS' last success was bias-related, it might not enjoy such good fortune this time. I have a bit of a conflict of mind on the matter. On the one hand, I could do with the CET coming right down to my prediction for obvious reasons. On the other, I enjoy exceptional warmth a great deal when it happens in spring or autumn, especially March-April or September-October. I'm also a big fan of impressive monthly stats. The warmest September for over 100 years, let alone on record, would be amazing to reflect on. |
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Homeland: Rural Mid-West Hants nearly 10 miles S of Salisbury (near Fordingbridge). More insights: https://twitter.com/peacockreports 2021's Homeland Extremes: T-Max: 30.4°C 21st Jul | T-Min: -6.8°C New Years Day! | Wettest Day: 34.1mm 2nd Oct | Ice Days: 2 (27th Jan & 8th Feb) Keep Calm and Forecast On |
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Rank: Advanced Member
Joined: 20/11/2015(UTC)
Posts: 6,868
Location: Central Southern England
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Just like to say that my prediction on 31st August was purely and totally based on nothing other than a funny feeling- it just got lucky, equal to the many unlucky ones previously! |
Bertie, Itchen Valley. August 2020: best heatwave since '95 |
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Rank: Advanced Member
Joined: 10/06/2016(UTC) Posts: 4,900 Location: Blackrod, near Chorley, Lancs - alt: 156m
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Everyone may have gone too low at this rate! |
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Rank: Advanced Member
Joined: 14/07/2012(UTC) Posts: 30,250 Location: Peasedown St John. N.E. Sommerset
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Met Office Hadley 18.2c Anomaly 3.7c provisional to 11th Metcheck 17.2c Anomaly 3.48c Netweather 18.04c Anomaly 4.35c Peasedown St John 17.17c Anomaly 2.59c. |
Some people walk in the rain. Others just get wet. I Just Blow my horn or trumpet
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