Weather

R

radio848

Hello Guys & Gals:
Can anyone help me with a formula that converts current Barometric pressure
to Sea Level pressure?
Thanks a lot.
 
B

Bernard Liengme

Can you remind us of the physics formula? I know it has g (gravity constant)
and h (height) and it must have air density. So I suppose it will have T to
compensate for change in density with temp. If you provide the physics one
of us will Excel it.

Friendship through Internet!
 
N

Norman Harker

Hi Radio848!

The formula I have is:

BP = SLBP-2.5*(A/100)

Where: BP is Barometric Pressure at Station in mm Hg
SLBP = Sea Level Barometric Pressure in mm Hg
A = Altitude in feet

So you want

SLBP=BP+2.5*(A/100)

--
Regards
Norman Harker MVP (Excel)
Sydney, Australia
[email protected]
Excel and Word Function Lists (Classifications, Syntax and Arguments)
available free to good homes.
 
R

radio848

Hello Norman:

Norman Harker said:
Hi Radio848!
Had to add a zero; SLBP=BP+2.5*(A/1000), so I hope this works
Click to expand...
satisfactorily. Do you agree?
I bought an ameture weather station and I am having a dickens of a time
calibrating the thing. I haven't found anyone in the field of weather, yet
that can explain it to me. Or, I am awfullly dense, one or the other.
Thank you much.
Wayne
 
N

Norman Harker

Hi Radio848!

From:
http://vk3.aprs.net.au/barometer.shtml

For each meter you are in height above the Mean Sea Level you add
..11717 millibars to your Barometric Pressure reading. So if your
altitude is 500 mtrs and the local pressure is 960mb add 58.59mbs
(.11717 * 500) to your reading to get the MSL pressure of 1018.59mb


--
Regards
Norman Harker MVP (Excel)
Sydney, Australia
[email protected]
Excel and Word Function Lists (Classifications, Syntax and Arguments)
available free to good homes.
 
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