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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."
An apt named film on the telly this evening . . .
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.
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)
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.
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.
">http://weather.andrewlalchan.co.uk/
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.
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⁉️
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.
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!
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.
Peaked here at 1048.29 Hpa at 23.14hrs last night.
Currently 1048.02 Hpa
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.
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.
1046.5mB according to my VP2
1043.8mB according to my Garmin Fenix 5 watch
1048.4hPa currently (PWS), 1049.1hPa peak in the early hours.
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?
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?
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)!