Re: Barometric altimeter calibration

From: H.W. Stockman (stockman3_at_earth-REMOVE_THIS-link.net)
Date: 07/29/04 

Date: Thu, 29 Jul 2004 18:43:08 GMT

"GSV Three Minds in a Can" <GSV@quik.clara.co.uk> wrote in message
news:dgKgaCn3gSCBFA$1@from.is.invalid...
> Bitstring <opsbwpm7vzhb7hfm@ubi>, from the wonderful person Umberto
> Uderzo <uuderzo@togli.infinito.it> said
> >Oh, now I understand, I think...
> >
> >So the barometric pressure I must know where I'm standing still must be
> >the sea level pressure.
> >But now the question is... How can I find a sea level pressure
> >measurement on a mountain refuge
> >at 3000mt altitude?
>
> You turn on the TV and look at the weather map, or ring the nearest
> meteorological office. Same thing you have to do to set an ordinary
> barometer up correctly.

I'm not sure this point has been made strongly enough: here in the US, many
of the "barometric pressures" given on TV weather reports are actually
normallized to sea level, "corrected" for elevation effects by a variation
of the well-known exponential atmosphere equation. Raw weather station data
may give the true pressure in Torr. I don't know what they do in other
countries.

Also true in the US and Italy, there is often a lot of elevation gain
between the nearest news station location, and the place where one begins a
hike.

Relevant Pages

  • Re: Barometric altimeter calibration
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  • Re: Barometric altimeter calibration
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