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jhall
19 January 2020 21:43:53

I've just seen an interesting post on uk.sci.weather (yes, some of us still use newsgroups), which I hope its author (Len of Wembury) will forgive me reposting here:


"Correction to sea level pressure can introduce errors. No good looking it up in a table when we are
talking about record pressures. Need the mean temp over the height difference to put into the
thickness equation. Bit of an inversion at the surface atm so can't assume isothermal conditions. I
bet the values given at the AWSs are all assuming a bog standard conversion to sea level pressure
of about +1mb per 8 metres."


 

Cranleigh, Surrey
four
  • four
  • Advanced Member
19 January 2020 21:53:10
That wouldn't be practical or realistic though.
It's fairly easy to find the ASL of a location especially nowadays with GPS apps, and that gives a reasonable way to compare sites over varying terrain.
The difference if not adjusted to sea level equivalent is surprisingly large.
North York Moors weather 
idj20
19 January 2020 22:06:52

An apt named film on the telly this evening . . . 


Folkestone Harbour. 
Rob K
19 January 2020 22:34:51

That wouldn't be practical or realistic though.
It's fairly easy to find the ASL of a location especially nowadays with GPS apps, and that gives a reasonable way to compare sites over varying terrain.
The difference if not adjusted to sea level equivalent is surprisingly large.

Originally Posted by: four 


GPS altitude isn’t very reliable. And especially if the GPS receiver doesn’t apply the necessary correction from the geoid height to actual local mean sea level (for my area I think the correction is around 11 or 12 metres IIRC)

Yateley, NE Hampshire, 73m asl
"But who wants to be foretold the weather? It is bad enough when it comes, without our having the misery of knowing about it beforehand." — Jerome K. Jerome
Rob K
19 January 2020 22:36:27

1049.4 according to my phone barometer app, based on an altitude of 74m (73m asl here plus the height of the desk). Station pressure is 1040.2. Annoyingly even with that high pressure, high cloud has moved in limiting the temperature drop.


 


If I let the phone use the GPS altitude it is currently telling me it’s 67m asl. Earlier today it was showing 84m asl. Each metre gives an error of roughly 0.1 hPa. 

Yateley, NE Hampshire, 73m asl
"But who wants to be foretold the weather? It is bad enough when it comes, without our having the misery of knowing about it beforehand." — Jerome K. Jerome
Quantum
  • Quantum
  • Advanced Member Topic Starter
19 January 2020 22:45:15

Pressure now falling in S wales, but still rising in SW England. I don't think the high is intensifying anymore. The highest pressure seems to be just past 1050hpa although it does seem to be slowly moving south so pressure continues to rise in Devon and Cornwall.


 

Twitter: @QuantumOverlord (general), @MedicaneWatch (medicane/TC stuff)
2023/2024 Snow days (approx 850hpa temp):
29/11 (-6), 30/11 (-6), 02/12 (-5), 03/12 (-5), 04/12 (-3), 16/01 (-3), 18/01 (-8), 08/02 (-5)

Total: 8 days with snow/sleet falling.

2022/2023 Snow days (approx 850hpa temp):

18/12 (-1), 06/03 (-6), 08/03 (-8), 09/03 (-6), 10/03 (-8), 11/03 (-5), 14/03 (-6)

Total: 7 days with snow/sleet falling.

2021/2022 Snow days (approx 850hpa temp):

26/11 (-5), 27/11 (-7), 28/11 (-6), 02/12 (-6), 06/01 (-5), 07/01 (-6), 06/02 (-5), 19/02 (-5), 24/02 (-7), 30/03 (-7), 31/03 (-8), 01/04 (-8)
Total: 12 days with snow/sleet falling.
redmoons
19 January 2020 23:17:02


">http://weather.andrewlalchan.co.uk/

Originally Posted by: Global Warming 


Way too low. Northolt had 1048.1mb at 1800



Strange, could it to be with height I am on top of a hill? It only got to a max of 1042.3 so far.

Andrew,
Watford
ASL 35m
http://weather.andrewlalchan.co.uk 





Zubzero
20 January 2020 01:34:19
According to a weather news story on the app called weather&radar the high pressure is called EKART. Never heard of high pressure being named⁉️
johncs2016
20 January 2020 03:24:03

According to a weather news story on the app called weather&radar the high pressure is called EKART. Never heard of high pressure being named⁉️

Originally Posted by: Zubzero 


I once read a story somewhere that the Met Office in conjunction with Met Eireann were going to introduce a naming system for areas of high pressure which gave us our summer heatwaves, that was similar to the naming system which is already in place for our major low pressure systems at this time of the year.


Given that this was a story which went out on 1st April of that particular year though, it wasn't difficult to spot that this was only an April Fool's story in this instance and indeed, that was exactly what that turned out to be.



 

The north of Edinburgh, usually always missing out on snow events which occur not just within the rest of Scotland or the UK, but also within the rest of Edinburgh.
Retron
20 January 2020 03:56:36

1045 this morning according to my station, with a max of 1046 earlier.

My phone, meanwhile, reckons 1047 (falling to 1046 upstairs) and xcweather has the local stations at 1048.

Bearing in mind I'm just under 30 feet above sea level here, the phone is pretty much spot on. It seems daft that it beats a (£150-ish) weather station!

Leysdown, north Kent
Jim_AFCB
20 January 2020 05:21:15
Peaked at 1049.9 here in Bournemouth in the early hours of this morning. now dropped back a hPa or so, think the pressure has probably peaked now.
Jim, Bournemouth, Dorset. Home of the mighty Cherries
Bournemouth Weather Onine - Click here. 
Rob K
20 January 2020 07:54:54


 


Way too low. Northolt had 1048.1mb at 1800


Originally Posted by: redmoons 


Strange, could it to be with height I am on top of a hill? It only got to a max of 1042.3 so far.



Are you quoting the station pressure or the SLP? The higher you are the lower the station pressure: your 35m altitude would account for about 4mb of difference I think. 

Yateley, NE Hampshire, 73m asl
"But who wants to be foretold the weather? It is bad enough when it comes, without our having the misery of knowing about it beforehand." — Jerome K. Jerome
Gusty
20 January 2020 08:07:18

Peaked here at 1048.29 Hpa at 23.14hrs last night.


Currently 1048.02 Hpa

Steve - Folkestone, Kent
Current conditions from my Davis Vantage Vue
https://www.wunderground.com/dashboard/pws/IFOLKE11 
Join Kent Weather on Facebook.
https://www.facebook.com/stevewall69/ 



Tim A
20 January 2020 08:11:03


 


Strange, could it to be with height I am on top of a hill? It only got to a max of 1042.3 so far.


 


Are you quoting the station pressure or the SLP? The higher you are the lower the station pressure: your 35m altitude would account for about 4mb of difference I think. 


Originally Posted by: Rob K 



Altitude shouldn't matter though as we should all be measuring the theoretical sea level pressure at our location and set our barometers against MSLP.


 


So it is not really an experience as such for most, "experiencing such high pressure".  According to a calculator I have just used 1050mb at sea level would be just 1025mb at 200m asl so for me a trip to the coast on a summers day would result in a higher pressure experience.


Just seen on a weather Facebook group people complaining of pressure head aches.

Tim
NW Leeds
187m asl

 My PWS 
Brian Gaze
20 January 2020 08:11:42

1046.5mB according to my VP2 


1043.8mB according to my Garmin Fenix 5 watch

Brian Gaze
Berkhamsted
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Girthmeister
20 January 2020 08:21:46

1048.4hPa currently (PWS), 1049.1hPa peak in the early hours.

Arcus
20 January 2020 08:53:44
XCweather showing a couple of 1050s now.
Ben,
Nr. Easingwold, North Yorkshire
30m asl
Quantum
  • Quantum
  • Advanced Member Topic Starter
20 January 2020 10:47:05

It's back up again although this will probably be a secondary peak.


Can anyone confirm the 1050.5hpa reading at Mumbles, South Wales is the highest it has got so far?


 

Twitter: @QuantumOverlord (general), @MedicaneWatch (medicane/TC stuff)
2023/2024 Snow days (approx 850hpa temp):
29/11 (-6), 30/11 (-6), 02/12 (-5), 03/12 (-5), 04/12 (-3), 16/01 (-3), 18/01 (-8), 08/02 (-5)

Total: 8 days with snow/sleet falling.

2022/2023 Snow days (approx 850hpa temp):

18/12 (-1), 06/03 (-6), 08/03 (-8), 09/03 (-6), 10/03 (-8), 11/03 (-5), 14/03 (-6)

Total: 7 days with snow/sleet falling.

2021/2022 Snow days (approx 850hpa temp):

26/11 (-5), 27/11 (-7), 28/11 (-6), 02/12 (-6), 06/01 (-5), 07/01 (-6), 06/02 (-5), 19/02 (-5), 24/02 (-7), 30/03 (-7), 31/03 (-8), 01/04 (-8)
Total: 12 days with snow/sleet falling.
Chunky Pea
20 January 2020 11:09:45
1045.4 hPa here. Been stuck around this figure for the last 12 to 18 hours or so.
Current Conditions
https://t.ly/MEYqg 

"You don't have to know anything to have an opinion"
--Roger P, 12/Oct/2022
overland
20 January 2020 11:36:17


It's back up again although this will probably be a secondary peak.


Can anyone confirm the 1050.5hpa reading at Mumbles, South Wales is the highest it has got so far?


 


Originally Posted by: Quantum 


 


The Mumbles' figure is being quoted as the highest - the highest for 60 years according to the BBC News website


 


https://www.bbc.co.uk/news/uk-wales-51174008


 


The only records that are normally broken here are for wind (speed)!

Mumbles, Swansea. 80m asl
Quantum
  • Quantum
  • Advanced Member Topic Starter
20 January 2020 12:43:14

Think that's it. On the way down again, and won't come back up.


So Mumbles takes the all time welsh record with 1050.5hpa


 

Twitter: @QuantumOverlord (general), @MedicaneWatch (medicane/TC stuff)
2023/2024 Snow days (approx 850hpa temp):
29/11 (-6), 30/11 (-6), 02/12 (-5), 03/12 (-5), 04/12 (-3), 16/01 (-3), 18/01 (-8), 08/02 (-5)

Total: 8 days with snow/sleet falling.

2022/2023 Snow days (approx 850hpa temp):

18/12 (-1), 06/03 (-6), 08/03 (-8), 09/03 (-6), 10/03 (-8), 11/03 (-5), 14/03 (-6)

Total: 7 days with snow/sleet falling.

2021/2022 Snow days (approx 850hpa temp):

26/11 (-5), 27/11 (-7), 28/11 (-6), 02/12 (-6), 06/01 (-5), 07/01 (-6), 06/02 (-5), 19/02 (-5), 24/02 (-7), 30/03 (-7), 31/03 (-8), 01/04 (-8)
Total: 12 days with snow/sleet falling.
Gusty
20 January 2020 13:03:07

A second peak of 1048.29 Hpa at 08:44 hrs matched yesterday evenings first peak.


On the way down now.....1047.17 Hpa.

Steve - Folkestone, Kent
Current conditions from my Davis Vantage Vue
https://www.wunderground.com/dashboard/pws/IFOLKE11 
Join Kent Weather on Facebook.
https://www.facebook.com/stevewall69/ 



bradders
20 January 2020 17:11:58
XCWeather is showing 1045mb at nearby Manchester Airport, my weather station shows 1045.9mb, obviously not very accurate, and my barograph is showing 1045mb falling slowly.

Eric. Cheadle Hulme, Stockport.
Stormchaser
20 January 2020 17:25:24

I've never been more frustrated by my nearest official weather station; Hurn peaked at 1049.9 mb, denying me a true 1050 by a gnat's whisker .

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Keep Calm and Forecast On
Bertwhistle
20 January 2020 17:47:25


 



Altitude shouldn't matter though as we should all be measuring the theoretical sea level pressure at our location and set our barometers against MSLP.


 


So it is not really an experience as such for most, "experiencing such high pressure".  According to a calculator I have just used 1050mb at sea level would be just 1025mb at 200m asl so for me a trip to the coast on a summers day would result in a higher pressure experience.


Just seen on a weather Facebook group people complaining of pressure head aches.


Originally Posted by: Tim A 


Yes, that's the official line; but flies in the face of common sense when talking about local values. We don't do it with temperatures or orographic rainfall. Imagine: never mind what the rain gauge says- you should cover over a tenth of the aperture with every 100m of ascent. Why with pressure? Of all the features of weather, it's the one where there's bugger all to write home about as it's all visible on a mesoscale chart as far as MSLP is concerned. Local variations add to the joy of the weather.


Otherwise, it would all pretty much boil down to comparing apparatus accuracy.

Bertie, Itchen Valley.
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