Questions tagged [barometric-pressure]
The barometric-pressure tag has no usage guidance.
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Rough empirical formula for average temperature and pressure
Is there a rough empirical formula that approximates local average annual air temperature and pressure from geographical latitude, altitude and distance from ocean shore?
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Assuming no nearby animal/plant life or other 'artifical' influences, would a trapped pocket of air under 50-60 meters of seawater be breathable?
My guess as to the answer to my own question:
Over a long period of time, no matter what the original composition of the air pocket was, it will exchange gases with the seawater just below it, which ...
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Why do tropical areas have low air pressure?
From the question Why are pressure levels raised on warm days?, my understanding is that the air pressure at surface level is not affected by temperature, as the mass of the imagined air column stays ...
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Odour from Tenant after it rains
I own a furniture business which is located next to a dog daycare. When it rains the stench of the dog daycare appears in my space. We recognize the smell as it is identical to what you smell when ...
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Confusion with thermal wind mechanism
In meteorology, we know that cold air mass sinks while warm air mass rises due to density difference, resulting in higher pressure in cold air mass. This leads to a horizontal pressure gradient from ...
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What does the index "p" mean in the gradient of geopotential in pressure coordinates?
Currently I hear a series of tutorial videos on atmospheric dynamics as a first starting preparation for reading more detailed material, such as Holton. In particular I refer to this part:
https://www....
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What is the atmospheric pressure at the deepest point of the Kidd mine?
At 2735 m (8973 ft) below sea level, the Kidd mine reportedly has the deepest non-marine point of the Earth's surface (since the Kola borehole is sealed). I wonder what the pressure down there is, as ...
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Why is the quantity "Geopotential" important in meteorology?
So far I understood, geopotential $\Phi$ is just defined by
$$\vec \nabla \phi = \vec g$$
But because g can be taken to be constant within troposphere, it is nothing but
$$\Phi(z) = g \cdot z + C$$
So ...
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Is there a relationship between pressure drop and sea level rise?
Climate Fresk is a NGO which publishes a card game aimed at educating people about climate change. Card 33 (page 16 of this pdf file) reads (emphasis mine):
Cyclones and atmospheric waves bring wind, ...
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Air pressure on Mars below ground
As I understand, in deep mines on Earth the air pressure increases with depth. At what depth on Mars would the air pressure reach 14psi (97 kPa)?
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Why doesn't one build pressurized camps at Mount Everest? [closed]
Why aren't permanently pressurized camps being built at Everest and any 23,000'+ mountain, and perhaps a pressurized enclosed platform at the very summit, to no longer have to bother about altitude ...
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Converting between sea level and surface pressure values in HRRR dataset
https://rapidrefresh.noaa.gov/hrrr/
In this dataset's GRIB format files, there are two variables representing an atomspheric pressure forecast: (output as opened with pygrib)
41:MSLP (MAPS System ...
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What causes these periodic high-pressure blobs along the west coast of South America?
I was looking through the Weatherbug atmospheric pressure map around 8:30 am ET on Oct 26 2021, and noticed this chain of small high pressure blobs along the west coast of South America. It was also ...
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What does a change in the mean pressure across 750 km indicate/signify?
Coming from the aviation site: What is the westerly index?
The westerly index is:
... the Trenberth Z1 index (Trenberth 1976), which is the departure of the monthly mean pressure difference between ...
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At what point is the atmospheric pressure considered to be high or low?
I am working with a program that I want to inform the atmospheric pressure level at atm and if the pressure is high, ...
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Temperature change in Earth atmosphere models?
NASA's page about Earth atmosphere models gives a weird equation about temperature change in different atmospheric layers. One of the formulas looks like this:
Can someone explain to me what this ...
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What does a floating mercury barometer look like? How does it work and how is buoyancy used?
This answer to How are barometric pressure measurements traceable over centuries to 100 parts per million accuracy? describes a floating mercury barometer, and mentions that some employed a Vernier ...
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How are barometric pressure measurements traceable over centuries to 100 parts per million accuracy?
The BBC News item Barometric pressure in London 'highest in 300 years' at least begins with
Overnight, Sunday into Monday, London's Heathrow Airport recorded a barometric pressure of 1,049.6 ...
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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
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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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When it is said that air moves from warm object to a cold object, how is it possible that air moves from high pressure area to low pressure area?
By air moving from high pressure area to low pressure area means that it's moving from colder area to a warmer area, are they both not contradictory? I might have understood something in a wrong way, ...
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How closely related is surface air temperature to pressure?
Obviously with a given mass and volume of air, pressure is directly proportional to temperature. However, I would expect the total mass of air within a column of atmosphere to vary over time, due to ...
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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 ...
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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 ...
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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 ...
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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 ...
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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, ...
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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 ...
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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 ...
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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 ...
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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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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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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 ...
user6402
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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 ...
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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(...
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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 ...
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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 ...
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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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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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