Questions tagged [weather]

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What would cause continuous electron buildup on the ground during a thunderstorm?

I realize that the triboelectric phenomena going on during thunderstorms is not well understood (as pointed out by xkcd here). However, on June 16 I witnessed behavior that I had never before seen ...
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Thermodynamics joule’s law [closed]

Is the earth cooling or heating? According to joule 2nd law the earth is cooling for long term as we can prove the heat exchange is negative. What do u think?
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1 vote
1 answer
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Is the cross-sectional area of a mercurial barometer standardized?

Many textbooks mention that the height of a column of mercury in a mercurial barometer is 29.92" Hg under standard atmospheric conditions. However, they usually do not mention the diameter of ...
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0 answers
26 views

Tilted bifacial solar panels vs. flat monofacials in cloudy weather

Many articles on the internet hail the bifacials for their productivity during cloudy weather. But are they really any better than a flat monofacial solar panel? FWIW, my setup is made of a 20° sloped ...
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1 answer
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How can plots showing the mixing line for Schmidt-Appleman criterion (for aircraft contrail formation modeling) show liquid water below triple point?

In trying to understand the Schmidt-Appleman criterion for contrail formation. There is one aspect that I cannot make sense of. In many papers that describe the criterion they include a plot as shown ...
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0 votes
0 answers
27 views

feeling humidity - absolute vs relative

I m trying to understand whether it is absolute humidity (how much moisture in the air) or relative humidity (percentage to total saturation) reflects how humid we feel. In most places i searched the ...
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1 vote
0 answers
35 views

Approximating the warmest time of day

I'm trying to find a very simple approximation of when the maximum air temperature will occur on a given day at a given location. By "air temperature," I just mean the air temperature at ...
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1 answer
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How would a rainbow from a divergent light source look like?

Many explanations of the shape of rainbows as constant angle reflections do assume the light, incident on rain droplets, to be a parallel beam of light rays. That might for the sun-earth system be ...
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4 votes
0 answers
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River freezing conditions

Quite uncommon -8°C here in Hamburg at the moment I write, and I thought: Surely our local rivulet is frozen over. In retrospect this was silly, the "rivulet" is 3rd order and has a very ...
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0 votes
0 answers
28 views

Temperature-Humidity-Wind (THW) index for hot and cold weather [duplicate]

Does anyone know the formula (or the algorithm, even a fortran code) to calculate the Temperature-Humidity-Wind (THW) index not from the heat index but in general? (someone published a (too simple?) ...
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3 votes
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What allows this tornado to form in a frying pan?

I have just seen this video here where a mini tornado has formed in a frying pan: https://www.youtube.com/watch?v=6CJ-8ze2FjE Does anyone know how this happens or where I can find an explanation?
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2 answers
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How does the Extreme Heat of a Lightning Bolt not Kill Anyone?

Ok so, according to various different online sources, a single bolt of lightning is capable of raising the temperature of the air it rips through to... ummmmm... 50,000 degrees Fahrenheit? What? That'...
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-1 votes
1 answer
50 views

Modelling sky type as an area light source [closed]

I have a trouble understanding the mapping going on here. The author asserts that sky types can be modelled as follow : The first one appears to represent a clear sky view, the second is more of an ...
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How does air pressure affect the ability to create a frequency and which frequency is least attenuated

From $I=ξ^2ω^2cρ$ where ξ is the particle displacement, ω the frequency, c the speed of sound and ρ the density of the medium (1, 2), I understand that for the same frequency and amplitude the sound ...
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6 votes
1 answer
213 views

Is the downforce of rain on airplanes negligible?

Is the downward pressure exerted by raindrops in even a strong storm on a lightweight aircraft negligible? Someone better informed may likely improve the following reasoning, cobbled together from ...
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0 votes
1 answer
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Hurricane - trajectory in a logarithmic spiral

Let $f : [0,\infty[ \longrightarrow [0,\infty[$ be a given function and consider a particle on the plane such that the particle starts at point $p_0$ at time $t=0$, its trajectory $t \mapsto p_t $ is ...
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1 vote
1 answer
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Understanding Convectional Rainfall

Consider the following explanation of convectional rainfall given in a VII grade textbook. When air comes in contact with the hot surface of the earth, it gets heated, becomes light and rises in the ...
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4 votes
1 answer
177 views

Why doesn't lightning stop when it starts raining?

According to my understanding, lightning happens because the clouds get charged due to friction from the moving clouds and the ground gets polarized by the nearby charged clouds. And the two opposite ...
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1 vote
0 answers
32 views

What causes Saturn's hexagon hurricane? [duplicate]

Recently, Tien Nguyen JPL Fellow - Chief Engineer at NASA Jet Propulsion Laboratory, did share this photo that says "Cassini catches an awesome glimpse of Saturn’s north pole hurricane" I ...
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2 answers
108 views

Is weather a phenomenon impacted by quantum randomness?

Im trying to find phenomena that impact our everyday lives that are subject to quantum randomness. And I was wondering whether weather might be one of them. Can an electron behaving slightly ...
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0 votes
1 answer
157 views

Examples of phase transition nuclei whose dynamics impede their own growth?

I recently asked a question over on the Earth Science stack exchange about cumulus cloud formation from (roughly) point sources. These points can form around the same time across large areas, such as ...
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Do tidal forces create atmospheric jet streams?

Earth's large-scale wind patterns (a.k.a. jet streams) are generally attributed to "differential heating" by the sun. But the large-scale patterns in Earth's oceans (a.k.a. tides and tidal ...
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25 votes
1 answer
4k views

What did I just photograph? (rainbow way out of place)

I just captured the following two pictures. Straight above me, almost directly above, was a rainbow, about 120 degrees of it were visible. The thing is, the sun was completely out, low on the horizon ...
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2 votes
1 answer
30 views

What would be the most UV resistant rubber color?

I'm looking for the longest lasting speargun bands. They come in a variety of colors so I'm wondering if a certain color of rubber would help them last longer. They will be exposed to a lot of ...
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3 votes
3 answers
417 views

Why don't clouds gradually evaporate and never come down as rain?

Clouds are present in the troposphere . So the radiation from the Sun first needs to pass this layer of the atmosphere to come down which means that the clouds above are constantly being radiated from ...
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1 vote
1 answer
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I know the temperature and air pressure at specific height, can I estimate the temperature at different height?

I know what the temperature is at a specific height, and I know the air pressure there. Is it possible to estimate the temperature at a different height? (It's a public weather station, it has an API, ...
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0 votes
2 answers
104 views

Why are the tops of mountains covered with snow, but not at the bottom? [duplicate]

Why are the tops of mountains covered with snow, but not at the bottom? There is always snow even on high peaks in very hot areas. It has to be very cold at the top of the mountaintop so that the snow ...
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1 vote
0 answers
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Cloud got trapped over Ayu Dag mountain in Crimea

Personally I was impressed by observing a cloud got trapped over Ayu Dag mountain in Crimea, Russia on 7th April 2021. It is said that it was possible to see the cloud during a few hours, then it ...
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0 votes
0 answers
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Does cold dry air rich in static electricity cause the Hessdalen lights in Norway?

I have read many articles on the Hessdalen lights ( which many professional scientists think are plasmas). https://en.wikipedia.org/wiki/Hessdalen_lights I have concluded that cold dry air rich in ...
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11 votes
1 answer
214 views

Are clouds heavier than air?

Clouds are gatherings of water droplets floating in the air. Water droplets above a given size fall down as rain. But what about the water droplets forming the cloud---aren't they also heavier than ...
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41 votes
8 answers
7k views

Why do small patches of snow remain on the ground many days or weeks after all the other snow has melted?

I often notice small patches of snow that remain on the ground in seemingly random locations, many days or even weeks after all other snow in an area has melted, and even when temperatures have been ...
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28 votes
5 answers
7k views

Why is the air inside an igloo warmer than its outside?

An igloo is not only used as shelter from snow but also to keep warm. Perhaps, a simple igloo is made of ice and nothing else still, why is its interior warmer than the exterior?
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4 votes
3 answers
547 views

Is it true that there would be no snow without dust?

I've heard from my friend that snow flake forms around the tiny dust, flying in the atmosphere. I have not found any reliable source to confirm or reject it, that's why asking here. Is that always ...
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1 vote
2 answers
43 views

Why water vapors form over the surface of a water body in the morning?

I live near equator region of Earth. During winters specifically, I see water vapors forming over the surface of the water body in the morning. Why do they form?
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27 votes
1 answer
492 views

What are these strange rays in the sky?

While driving, I noticed the sky had weird rays that appeared converge at some point on the horizon. I took a few pictures in hopes I could figure out what they were. There was a storm coming from ...
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3 votes
1 answer
63 views

Why isn't thunder muted or softened by rain drops?

I watched a documentary showing how NASA applied water droplets to absorb the huge amount of sound energy when the rocket is ignited at launch. So, how come billions of rain drops don't seem to mute ...
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0 votes
2 answers
449 views

Can pressure gradient force be balanced by Coriolis force?

I was learning about wind from my class textbook. In that there is first a description of forces affecting the velocity and direction of wind followed by that is geostrophic wind. My question is: At ...
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4 votes
2 answers
227 views

Explanation for an unexpected rainbow

Yesterday, I observed an unexpected rainbow in the sky. There was no forecast for rain, neither was it raining anywhere nearby. I have been trying to find an explanation but don't seem to find any. ...
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2 votes
0 answers
218 views

Does level of pollution determine if a rainbow will be formed? [closed]

Today I saw a rainbow after almost a decade. I live in Noida (a city) in India. Most people I know believe that: we don't see rainbows nowadays because of pollution and now after nearly 3 months since ...
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2 votes
2 answers
257 views

Why do my lights become brighter during a thunderstorm?

Today, during a thunderstorm, the lamps in the room suddenly flickered and then gradually became brighter in less than a second. The lamps remained brighter than normal for a few seconds before ...
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0 answers
32 views

Best Resources for Learning Mathematics Behind Weather Forecasting

Anyone know what the standard texts and papers are for understanding how modern ie numerical weather forecasting is done?
3 votes
0 answers
128 views

Is there a connection between bathtub drains and tornados?

In the MIT fluid videos (link with timestamp), I heard that a tornado is essentially the same physics as a bathtub drain, but upside down. It doesn't look that way to me. It looks like both fluids ...
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1 vote
0 answers
38 views

Bottom orbital velocity during a typical typhoon

What is the wave orbital velocity generated during a typhoon? I cannot find direct measurements, so hoping to find a way to calculate this. In other words: How do I get from wind speeds of 12 on the ...
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2 votes
0 answers
117 views

Why do rain clouds form in the first place?

Thought process leading to the question It's cold over here in India and I noticed that while breathing out some cloudy thing comes out of my mouth (I found it is called EBC (Exhaled Breathe ...
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39 votes
4 answers
6k views

Why are rain clouds darker?

I was taught in school that clouds are white due to the scattering of light. Since all rays are reflected it appears as white. But I am wondering about rain clouds. Why are rain clouds darker?
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3 votes
1 answer
70 views

Is there a molecular diffusion component to wind?

I'm thinking of vapor pressure from terrestrial water: A highly evaporating area in the ocean creates a volume of high relative humidity, the vapor tends to move to less humid air and by molecular ...
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0 votes
2 answers
175 views

Physical meaning of angular spectrum

I have been going through the paper Diffraction from an irregular screen with applications to ionospheric problems. H.G. Booker, J.A. Ratcliffe and D.H. Shinn. Philos. Trans. Royal Soc. A 242, 579 ...
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2 votes
1 answer
78 views

Why doesn't it rain every night as humid air cools?

When atmospheric relative humidity (RH) exceeds 100%, water must condense out of the air. We typically see this as rainfall. In North-Eastern U.S. summers it is common for daytime air to reach above ...
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-3 votes
2 answers
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Why we have not eliminated hurricanes and tornadoes? [closed]

Hurricanes are caused by too much warm humidity in the air. When this humid air encounters cold air, the humidity condenses to water which forms a low pressure region of air. The low pressure region ...
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1 vote
1 answer
114 views

Is a typhoon/hurricane also affected by Magnus Effect?

We all know that typhoons move as they rotate.
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