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Questions tagged [meteorology]

Meteorology is the interdisciplinary scientific study of the atmosphere.

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1answer
42 views

Why does high pressure cause clear skies?

In high-pressure areas, air falls, but why does high pressure leads to clear, sunny skies?
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28 views

What exactly is the time step in weather predictions?

The question basically says it all. I am confused as to what the 'time step' in weather prediction signifies-- is it the time interval between each measurement of the initial condition? Or is it the ...
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1answer
35 views

why high pressure systems are colder in temperate climates?

How do we derive equations which relate the temperature and pressure anywhere in the atmosphere? (assuming earth is still so no coriolis effect and flat if that makes the problem any easier). Like ...
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3answers
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Can we theoretically guide cold air from high altitude down to the needy cities as free AC?

If you had an insulated tube (approximate size say 15k feet (5km) tall, 50ft (15m) diameter) with the top end open and bottom end closed, would the air in the tube eventually become as cold as the ...
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1answer
68 views

Does dew point change with change of ambient temperature?

I know dew point is the temperature at which air becomes saturated with vapor that was already in the air. So if I take some unsaturated air in a container and lower it's temperature, eventually at ...
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1answer
49 views

The link between two definitions of “potential density”

In Kundu's book , 4ed, P21, they define the potential density $\rho_\theta$ like this: However, later in P22, they define the potential density gradient as It seems to me that the potential density ...
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0answers
26 views

In terms of the greenhouse effect, what is the Earth's heat capacity?

Has the earth’s atmosphere reached an equilibrium at which the input radiation energy roughly equals its output, or is the output significantly lower than the input because the energy is being used to ...
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0answers
35 views

Is there a conventional term for the phenomena of when fluids increase in speed after hitting the ground?

Prompted by this question here that was near the top of the recent physics questions, Does airflow also increase in velocity as it hits a surface as fluid does?, I simply wanted to ask about the term ...
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1answer
43 views

How do bulk regions of clouds conduct charges into a lightning bolt?

It's easy to find explanations of the theories of charge accumulation in clouds during storms, as well as ones describing suspected processes leading to lightning channel formation. What I have yet to ...
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1answer
19 views

How to predict when a storm will hit given current & historical barometric data?

As a storm approaches, the barometric pressure gets lower. Suppose we have a barometer, we know a storm's approaching within the next 24 hours. We take measurements every second or two and have a ...
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0answers
60 views

Black hole internal mathematics

I read the article about mathematicians-disprove-conjecture-made-to-save-black-holes and was wondering: could we compare the universe to Meteorology and geophysics on earth to answer some of questions ...
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35 views

Colliding air masses of different temperatures

When air masses of different temperatures and humidities collide, why don't they fully mix and find an equilibrium instead of simply mixing at the borders and then stratifying? The physics, ...
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0answers
94 views

By how much does starlight heat the Earth?

According to this, the stars in the night sky have a cumulative magnitude of -6.5. This is very dim, so I expect the heat generated to be tiny, but I'm wondering how tiny. Moonlight does measurably ...
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43 views

Why does the Earth have six atmospheric bands?

This is a follow up to Why doesn't Earth's atmosphere form bands due to different rotational speeds? I know that the earth has atmospheric banding like the gas giants. What I want to know ...
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0answers
28 views

Does the electrification in clouds influence their growth or movement?

The electricity in clouds is often correlated with cloud microphysics and vertical winds, and we have only one way interaction of clouds to form electricity within them. Does the induced electric ...
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2answers
78 views

Icy roads while the temperature is above 0 Celsius?

The temperature last night in my suburb and in Montreal was 4 Celsius at 9 P.M. . The snow and rain of the day had melted and the roads were damp but not icy. This morning at 5 A.M, the temperature ...
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2answers
3k views

What is this sort of abstract rainbow?

Today I saw the phenomenon in picture below. It was not raining (at least nearby me). What can that be? What is the technical explanation? Edit: Just seen today in Southern Brazil another ...
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0answers
12 views

Calculating probability of precipitation based off of sensors [duplicate]

I am trying to use sensors attached to a small computer to make a very rough prediction on the probability of it precipitating. I am thinking of using a barometer to get the pressure and check for ...
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0answers
32 views

Large circular distribution of clouds

I've just noticed a strange circular pattern of clouds, above Netherlands, in a weather forecast website: This image was taken from the website around 11h30, and it was the frame from 9h45 (CET). Is ...
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1answer
85 views

Do in our atmosphere at least two positions exist where there is no wind?

If we look at a two-dimensional sphere and draw a continuous vector field on it, you can compare this with a tennis ball whose hairs you comb in a continuous way. Two points on the ball will have an ...
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1answer
80 views

Is the Sun disk always surrounded by a rainbow?

Today was one of the rare clear sunny days in my city, and I was watching the Sun for several hours. When looking with naked eyes at the sky very near the Sun, standing on the border of a shadow of a ...
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1answer
101 views

Is there any noise in or around cumulus / cumulonimbus clouds?

From the ground you obviously cannot hear any sound from a developing cumulus cloud, no matter how vigorous it is. BUT: Are there sound waves generated, e.g. at the cloud edges where there is a lot of ...
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2answers
161 views

Heating up the atmosphere of Mars

In this article: https://users.physics.ox.ac.uk/~pierrehumbert/papers/BAMS_SFatm.pdf, Raymond Pierrehumbert discusses (among other things) how Kim Stanley Robinson deals with the terraformation of ...
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0answers
24 views

How to calculate wind generated by a simple thermal gradient?

It's something I feel like I never came across in an obvious way in being taught meteorology, though perhaps I just overlooked it, or how to apply a specific equation, back then... Let's just go ...
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1answer
48 views

What's the reason of the oscillation in the brightness of lightning flashes?

In this video, which shows a lighting flash caught on a high-speed camera, you can see that (after 21 seconds video) the brightness of the lightning flash is oscillating a few times. Why do lightning ...
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2answers
1k views

Why do rain droplets differ so “much” in size?

Why do rain droplets differ so "much" in size? From the ones in drizzle rain to the droplets in a heavy shower? I guess there is a complicated interplay between the height from which they fall, the ...
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1answer
2k views

Nuclear bomb mushroom cloud with trumpet formation

I have found this specific image here (Loong found out that it is the Soviet Joe 4 test of the 400 kiloton RDS-6 warhead at the Semipalatinsk test site on August 12, 1953): Also an impressive Youtube ...
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0answers
40 views

Calculating temperature change for falling air [closed]

I have an exercise in dynamic meteorology that is set up like this: 1 kg of dry air is falling with a constant speed of 0.5 cm / s and 0.1 w/kg of heat is extracted. Does the air volume ...
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8answers
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If I'm traveling at the same direction and speed of the wind, will I still hear and feel it?

Because riding a motorcycle, I didn't feel a difference when riding in different directions.
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4answers
2k views

Rainbow in cloud near Sun

Recently, it was a fine sunny morning (around 100 minutes after sunrise) and the sun was briefly behind a small cloud. Near the sun was one of those wispy clouds one sometimes sees (possibly Cirrus ...
2
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2answers
525 views

How is 'Fog' in summer (sea-elevation) possible? [closed]

I am residing in New Delhi (pardon me for any irrelevant data I might include), and I noticed a really interesting thing. It's an average $30^{\circ}\mathrm{C}$ out here, and yet, most/some weather ...
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2answers
840 views

Why would El Niño affect atmospheric CO2 measurements?

Starting with this article in Gizmodo: El Niño Has Pushed Our Planet Past a Major Climate Milestone and then to this commentary in Nature Climate Change El Niño and a record CO2 rise there seems to ...
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2answers
1k views

What is the explanation of the glory (optical phenomenon)?

Yesterday, I took the following picture. I was looking downwards from within an aircraft and I saw the 'glory' around the shadow of the plane on the clouds below. Wikipedia has an entry on the ...
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1answer
281 views

How could I calculate the Heat Index with low humidity?

The formula shown in the Heat Index(HI) requires that the relative humidity should be equal to or greater than 40%, so how to calculate the heat index when the humidity is less than 40%? Or is there ...
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0answers
124 views

Dispersion parameters for Pasquill–Gifford stability class G (extremely stable)

Gaussian plume models are often used to model atmospheric dispersion because they are simple and computationally efficient. When not constrained by the ground or by inversion layers, the Gaussian ...
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1answer
287 views

Dry adiabatic lapse rate

Adiabatic lapse rate is defined as $$ \Gamma_a \equiv -\left(\frac{dT}{dz}\right)_{\rm parcel}=-\frac{R_{\rm a} T}{c_p \,p}\left(\frac{dp}{dz}\right)_{\rm parcel} = \frac{g}{c_p} $$ $R_a$ is gas ...
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2answers
1k views

How to estimate wind speed from a pressure difference?

Does a formula (or a rule of thumb) exist to estimate the wind speed between a high pressure area and a low pressure area given the pressure difference between the two areas? Only the wind resulting ...
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1answer
40 views

How are homogeneity or heterogeneity of materials decided?

How is the homogeneity or heterogeneity of materials decided? What kind of measurement or assessment exists for inferring when e.g. the density of the material of an object is uniform across the ...
5
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1answer
155 views

Why is it always foggy on new years eve?

I live in Hamburg in northern Germany and a few years ago I started to notice this: It is always foggy on new years eve. Yesterday there even was a sight distance of about 10 meters at some point. ...
4
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1answer
381 views

Hyperbolic flow / vector field - irrotational and divergence-free?

My text book on meteorology claims that a hyperbolic flow pattern is both divergence-free and irrotational: (d) Hyperbolic flow that exhibits both diffluence and stretching, but is ...
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2answers
2k views

Why does lightning most often occur at night?

This is a question based on my experience. I cannot say that lightning (succeed by thunder) never occurs during the day, but it seems most likely to occur during the night. Maybe the humidity levels ...
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3answers
206 views

How do you see a rainbow?

I know that we observe rainbows from light being reflected off of water in the atmosphere. So, what angle of incidence must exist between an observer and the sun in order to see the colors of the ...
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1answer
196 views

Here's a fun question, what would happen if Venus was thrown off in a highly elliptical orbit? [closed]

I'd like to know what would happen if Venus was flung into a highly eccentric orbit like Sedna (except maybe with its current perihelion) with an orbital period measured in thousands of years by a ...
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0answers
447 views

Is there a theoretical maximum speed for wind?

What we call wind is actually molecules moving into an area of lower particle density due to their thermal motion. A lower particle density offers less collisions (resistance), so more molecules move ...
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1answer
54 views

Weather Meridians

Are there meridians that effect cloud movement? While observing radar images of moisture bearing cloud movements (at my location in Florida), I've noticed a splitting of the cloud formations a ...
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1answer
628 views

Why do nuclear bomb explosions create an array of visible electric discharges in the form of lightening in the upper atmosphere?

I've seen videos on the internet, showing nuclear bomb test explosions, and there appears to be a large amount of visible lightening discharging numerous times over the development of the mushroom ...
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0answers
107 views

How much does barometric pressure change over minutes?

I have to correct an ongoing experiment for atmospheric pressure. This means that during the experiment I must read a chip that measures barometric pressure. The question becomes one of how rapidly I ...
4
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1answer
220 views

How much atmospheric pressure (CO2) is required to carry iron oxide dust in the wind?

It is common knowledge that there are dust devils and dust storms on Mars. But can we demonstrate that the atmospheric pressure on Mars, which is 0.6% of the pressure we experience on Earth, provides ...
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1answer
690 views

Difference between mixing ratio and mole fraction

I have been reading 'The Atmosphere of Venus' by V.I. Moroz which is available here. I am confused about the term 'mixing ratio' which is used on discussions in chemical composition. From what I ...
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1answer
294 views

Will the upcoming solar eclipse stress the European electrical grid?

From an article in the Financial Times today, about a solar eclipse on March 20th, 2015: An eclipse of the sun next month could disrupt Europe’s power supplies because so many countries now use ...