# Questions tagged [barometric-pressure]

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### What is the range of possible atmospheric pressures on the surface of the Earth?

I'm developing an Android app which uses a pressure sensor. Due to storage limitations I have to normalize and scale the atmospheric pressure values. For this I need to know the extreme values of ...
876 views

### How significant is a 5-10 mb drop in pressure over a 20 minute period?

I would be interested in seeing how significant a 5-10 mb drop in pressure would be at the surface, and 80 m in the air. The temporal scale would be 20 minutes. If the pressure starts to steadily ...
238 views

### How are low pressure zones tracked across the ocean?

When you look at a surface pressure chart e.g.: (from http://www.metoffice.gov.uk/public/weather/surface-pressure/#?tab=surfacePressureColour&fcTime=1437480000) you can see low pressure zones ...
2k views

### Pressure as a function of altitude above 11 km

I need to calculate the force that causes a weather balloon with a specific volume to rise. Having searched for quite a few hours, I found the needed formula that can be used to calculate the pressure ...
2k views

### Does temperature affect partial pressure of gas dissolved in water?

I am trying to understand the behavior of oxygen dissolved in seawater. I have always been under the impression that if a gas is in equilibrium between its gaseous and aqueous forms, that it will ...
3k views

### Why do certain areas on Earth have a higher or lower air pressure at sea level?

For instance, looking at this map of world air pressure in January and this map of July, why do some land surfaces have a higher pressure during the winter? I know that the tropics and Coriolis ...
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### Why does air subside in the Eye - the lowest pressure area of a tropical cyclone?

A low pressure area is associated with rising air while a high pressure area is associated with subsiding air. The best explanation I could come up with is either the cyclone is an exception or the ...
440 views

### Pressure as a function of altitude

My city's altitude is almost 950 meters, yet the weather stations provide a read of 102.14 kPa which is around 1 atm! Shouldn't the pressure be a function of elevation? I doubted that the data ...
2k views

### Relationship between atmospheric density and atmospheric pressure?

I am slightly confused as to how the following statement is true: As the density of the Earth’s atmosphere decreases, the average atmospheric surface pressure remains the same As dictated by the ...
3k views

### What is the inverted barometer effect?

In a related question (Does bathymetry affect ocean topography/height?), the effect of atmospheric pressure on sea level is described as "inverted barometer". What does it mean? How does it get ...
177 views

### Can strong winds significantly lower ocean surface levels, or is it really the static pressure differences?

The Washington Post article Hurricane Irma is literally sucking the water away from shorelines written by the Post's atmospheric scientist Angela Fritz describes leads with this: As a meteorologist,...
1k views

### Why do meteorologists use DM and equal height surfaces for some maps?

In discussions from the National Weather Service, storm systems are often quantified in terms of DM, such as in this forecast discussion from Los Angeles/Oxnard on February 15, 2017: A strong and ...
250 views

### Effects of pressure at sea level

According to this answer atmospheric pressure can vary between 870 and 1070 mb. Can you tell what (if any) effects would there be on sea level if such difference of pressure (200 mb) on two near ...
68 views

### Do sound waves from volcanic eruptions travel around the world?

Do sound waves from volcanic eruptions travel around the world? I recently read about the Krakatoa eruption and how sound waves from that eruption traveled around the globe 4 times and were detected ...
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### Equation for Atmospheric Pressure Tide

Using Pressure sensors - I found out that there is a daily pressure wave-like pattern with peaks at 9:00 & 21:00 (local time). I want to construct an equation to explain this phenomena, probably ...
130 views

### How is surface pressure generally measured, and at what actual height?

In various atmospheric equations, surface pressure is one of the variables used. For example, in calculating the density of air or pressure-corrected relative optical air mass. How is surface pressure ...
133 views

### How does MSLP change with elevation? trying to interpolate MSLP

My understanding of MSLP is that it is a normalized value for pressure at some location as if that location altitude was zero. "Thus, MSLP is not a function of elevation" However, after inspecting ...
5k views

### How to identify low or high pressure area

If rain is due to the flow of humid air from a high pressure area to a low pressure area, without the use of devices, technology or mass media is it possible to detect regions of high or low ...
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### Do high pressure systems draw air towards them?

I refer to the this very recent article, which quotes Andrew Watkins (Manager of Climate Prediction Services at the Australian Bureau of Meteorology). My understanding has always been that air flows ...
82 views

### Estimating fracture pressure (looking for literature to support)

I am trying to estimate fracture pressure of a reservoir when applying injection. I keep reading fracture pressure=reservoir pressure+2000psi or fracture pressure gradient is 0.7psi/ft, but I can't ...
187 views

### With respect to latitude and time of year, what geopotential heights are associated with low pressure systems on the North American landmass?

I was reading the paper The Washington DC tornado of 24 september 2001: pre-storm environment and radar perspectives which had this passage: At 1200 UTC 24 September 2001, at 500 hPa a deep (560 [...
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### Why is the Atlantic anticyclone an area of high pressure if it's the warmest spot on the planet?

I am taking a navigational course and part of it is about meteorology. There is one thing which is, although obvious, quite hard for me to grasp. Looking at a global weather map like this: https://...
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### Historical isobaric charts?

I am looking for a small-scale isobaric chart, which encompasses central Africa. I am interested in the time span of the past few months. Do you know where to find it? Thanks
21 views

### Get barometric data?

Is there any way to get barometric time series for regions of the United States? I know that barometric maps are widely available, but in my case I want to see a time series for one region. However, I ...
33 views

### How to Compute Visibility [duplicate]

I have the following data about a region, and would like to compute the visibility for that region, i.e. the distance that a person could see ahead of them. I have: precipitation (mm/day) dewpoint(...