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Rel and Absolute Baro readings.

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Stevebarker12:
My Absolute Baro readings seem to only tie in with true Relative Baro readings reported by Met Office.
My weather station is currently recording
Relative Baro pressure = 1015
Absolute Baro pressure = 1029
The Baro pressure being uploaded from my Youshiko YC9471 to Weather Underground and Weathercloud = 1015
The Baro pressures currently being reported by UK Met Office and other weather stations
in my area = 1030 ie agrees with Met Office/ other Wunderground sites
It is my understanding these official readings are Relative readings and not Absolute. ie they are corrected to sea level.
(I have an older YC 9386 which is reporting same Absolute and Std Baros as YC9471 - constent with each other)
Im a newbie - am I misunderstanding the readings and data being reported?
Any help appreciated.

Vasco:
If Google Earth is correct, Walton-le-Dale is about 10 metres above sea level so I cannot understand the -14 hPa correction your station suggests: correction to your absolute reading should be about +1.2 hPa to correct to sea level. So your 1029 would become 1030, a pretty good match to the Met Office reading.

Stevebarker12:
Thanks for replying.
Yes my elevation is actually 12 metres so yes its not very significant baro difference.
I dont understand why there is such a difference on my weather station unless 'Relative' being recorded by my weather station means something else.
Ive asked Youshiko for their comments.
Strangely I have an older version of  my Youshiko weather station and the readings also show the same values as new station.
And the Relative - lower value - is being uploaded to Weather Underground.
I assume the weather underground values being displayed from all other stations are relative - and not absolute?

gszlag:

--- Quote from: Vasco on January 15, 2025, 09:36:36 AM ---If Google Earth is correct, Walton-le-Dale is about 10 metres above sea level so I cannot understand the -14 hPa correction your station suggests: correction to your absolute reading should be about +1.2 hPa to correct to sea level. So your 1029 would become 1030, a pretty good match to the Met Office reading.

--- End quote ---
Good catch!
I am aware that in the UK, QNH is used extensively. and I suspect the REL readings mentioned by the OP is QNH I am however,searching for Met MSLP readings. Other than crude fax surface analysis maps, I haven't found a Met source for detailed MSLP readings.
Do you know where I might find them?

Vasco:

--- Quote from: gszlag on January 15, 2025, 10:00:38 AM ---Do you know where I might find them?

--- End quote ---

Sorry, I have great difficulty finding my way around the UK Met Office website. But I did find WOW MSLP readings from the OP's area: search here for Preston. There's quite a range. . .

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