It seems that we will never know the truth, first of all, the Mauna Loa station was constructed in 1956, so that does not go back far enough to indicate the “original” 32 in., of mercury scale.

Not only that but now the barometric monitoring has been “retired,” in other words, no more info in the future or of the past.
I WONDER WHY????

Info taken from here:
http://www.mlo.noaa.gov/programs/old/barometer/barometer.html

Some other programs that have also been “retired.”

retired Relationships Between Mineral Dust and Radionuclides from Historical Nuclear Weapons Tests (NMSU) retired 4 Wavelength Nephelometer (NOAA ESRL) retired Aerosol Aethalometer (NOAA ESRL) retired Meteorology Barometer (NOAA ESRL) retired Dasibi Surface Ozone Measurements (NOAA ESRL) retired Ion Exchange Column (DHS / USDE) retired Radio Nuclide Program (DHS / USDE) retired Variability in Accretion Rate of Interplanetary Dust Using 3He as Tracer (NASA/ Cal-Tech) retired Pollak Condensation Nuclei Counter (CNC) (NOAA ESRL) retired Solar Turbidity (NOAA ESRL) retired VOGNET (NOAA ESRL / OAR / DOE / HPA)

Is there some scary link between the barometric pressure and the Radio Nuclide Program?
Or is there some other reason why this information is being suppressed from the general public?

The Mount Washington Weather Station also used to have barometric pressure monitoring, but no more; the question is WHY?

By the way, sometimes simple calculations do not give the right answers, see the area where it says “Atmospheric Pressure, Selected Heights” at this web site.

http://hyperphysics.phy-astr.gsu.edu/Hbase/kinetic/barfor.html