<p>The reason for this is that the reported value is the relative pressure and not the absolute pressure. If meteorological stations reported the absolute pressure, dependent on elevation, it would been really confusing. So air pressure is always adjusted to sea level.</p>

<p>This is also why your home barometer has to be adjusted to show the correct pressure depending on the altitude where you are.</p>

<p>Here are a link to the weather close to where I live. It is at 150 m elevation,
<a href="https://www.yr.no/place/Norway/Buskerud/R%c3%b8yken/B%c3%b8dalen/hour_by_hour_detailed.html?spr=eng" rel="noreferrer">https://www.yr.no/place/Norway/Buskerud/R%c3%b8yken/B%c3%b8dalen/hour_by_hour_detailed.html?spr=eng</a> If you seek for Drammen you will see the green line showing the same pressure but the elevation there is close to sea level 10m or so.</p>

CC BY-SA 3.0
2017-06-05T14:29:41.927Z
Thanks for your answer! But I don't quite understand why reporting the real pressure confusing. And if I want to see the real pressure where should I look at? And one more question, if I want to calculate the air density of a certain place, which air pressure should I use, the real pressure or the relative pressure? Thanks again!
user8300
CC BY-SA 3.0
2017-06-05T15:01:57.343Z
if you want to calculate air density then you use the real air pressure or as the correct name is the absolute pressure.i did google lhasa atmospheric pressure just now and the air pressure there was 1012 mb.the reason meteorologists use relative pressure is to make it simpler to collect and prosess data from a wide range of weather stations,if all stations barometers are calibrated to sea level it will be less numbers to handle.
trond hansen
CC BY-SA 3.0
2017-06-05T15:17:35.147Z
if the elevation is known there is some fine pressure calculators on the net where you input the relative air pressure and your elevation to get the absolute pressure.
trond hansen
CC BY-SA 3.0
2017-06-05T15:53:32.997Z
I just found it. Solved my problem. Thanks for your help!
user8300
CC BY-SA 3.0
2017-06-05T12:24:43.330Z
2017-06-05T17:32:43.060Z
2017-06-05T17:32:43.060Z
trond hansen
<p>Why do cities at high altitude regions, such as Lhasa, altitude 11995ft (3656 metre), have high atmospheric pressures such as 30.11inHg (101.97 kPa) in the weather report?</p>

CC BY-SA 3.0
2017-06-05T08:46:36.533Z
Can you show an example of such a weather report?
Gimelist
CC BY-SA 3.0
2017-06-05T12:52:53.687Z
30.11 what? mm Hg, ft of water, grams per square thumb nail? What are your units?
Fred
CC BY-SA 3.0
2017-06-05T14:21:31.520Z
@Michael just google 'Lhasa atmospheric pressure', you'll see it, friend
user8300
<meteorology><atmosphere>
Why do cities at high altitude regions have high atmospheric pressures?
user8300
# Why do cities at high altitude regions have high atmospheric pressures?

(Asked by: username_0 on 2017-06-05)

Why do cities at high altitude regions, such as Lhasa, altitude 11995ft (3656 metre), have high atmospheric pressures such as 30.11inHg (101.97 kPa) in the weather report?

**Tags:** meteorology, atmosphere

> **Comments:**
> **username_1**: Can you show an example of such a weather report?  
> **username_2**: 30.11 what? mm Hg, ft of water, grams per square thumb nail? What are your units?  
> **username_0**: @Michael just google 'Lhasa atmospheric pressure', you'll see it, friend  

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## 1 answers

### Answer by username_3 on 2017-06-05. Score: 11 | Accepted answer

The reason for this is that the reported value is the relative pressure and not the absolute pressure. If meteorological stations reported the absolute pressure, dependent on elevation, it would been really confusing. So air pressure is always adjusted to sea level.

This is also why your home barometer has to be adjusted to show the correct pressure depending on the altitude where you are.

Here are a link to the weather close to where I live. It is at 150 m elevation,
<https://www.yr.no/place/Norway/Buskerud/R%c3%b8yken/B%c3%b8dalen/hour_by_hour_detailed.html?spr=eng> If you seek for Drammen you will see the green line showing the same pressure but the elevation there is close to sea level 10m or so.

> **Comments:**
> **username_0**: Thanks for your answer! But I don't quite understand why reporting the real pressure confusing. And if I want to see the real pressure where should I look at? And one more question, if I want to calculate the air density of a certain place, which air pressure should I use, the real pressure or the relative pressure? Thanks again!  
> **username_3**: if you want to calculate air density then you use the real air pressure or as the correct name is the absolute pressure.i did google lhasa atmospheric pressure just now and the air pressure there was 1012 mb.the reason meteorologists use relative pressure is to make it simpler to collect and prosess data from a wide range of weather stations,if all stations barometers are calibrated to sea level it will be less numbers to handle.  
> **username_3**: if the elevation is known there is some fine pressure calculators on the net where you input the relative air pressure and your elevation to get the absolute pressure.  
> **username_0**: I just found it. Solved my problem. Thanks for your help!  

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