Skip to main content

Questions tagged [weather]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0 votes
0 answers
27 views

Why is it that fragile objects can penetrate much sturdier objects during extreme weather

I understand that the high wind speed can accelerate said objects to immense velocities but I do not understand why do not fragile objects simply get destroyed upon impact?
Harrychink's user avatar
0 votes
2 answers
69 views

When rain clouds are formed, does the entropy decrease?

Water droplets gathered and formed into cloud which gets heavier then does the entropy of the system decreases? If so why 2nd law of thermodynamics allowed it?
user6760's user avatar
  • 13k
0 votes
0 answers
38 views

Thermodynamics question - Why does my apartment get colder when the weather gets warmer?

I'm in North Dakota, and over the last several years, I've noticed a trend. Whenever we have a cold snap (the weather gets below 0 degrees F), my apartment stays relatively warm (68-70 degrees F). But ...
urodelacity's user avatar
1 vote
0 answers
194 views

Why does warm, moist air generate a low-pressure area? [closed]

In school, I learned the mechanism of high and low pressure areas, which roughly goes like this: In the tropics, the sun warms up the air during the day. Water evaporates, so that the air gets warm ...
Bass's user avatar
  • 1,467
0 votes
1 answer
69 views

Where do the electrons in a lightning bolt come from?

Where do the electrons in a lightning bolt come from? There are problems with the explanations given up to at least two years ago. The explanation that the electrons come from inside the thunder cloud ...
Frank Jansen's user avatar
4 votes
3 answers
207 views

*Why* does global warming lead to more extreme weather events? [closed]

I read several times about global warming leading to more exteme weather events, i.e. flooding, droughts and even winter storms occuring at higher rates and with more intensity. So, higher temperature ...
Michael S's user avatar
  • 151
0 votes
0 answers
20 views

Diamond Dust - Reflection and Shimmering

Diamond dust is a natural phenomenon that occurs when ice crystals form closer to Earth and interact with sunlight. Now diamond dust shimmers because of the reflection and refraction of sunlight. I ...
Lalitha Rao's user avatar
0 votes
1 answer
52 views

Where does the centripetal come from, in a cyclone?

It needs a tremendous amount of impulse ($Force\times time$) to keep the large mass of air and water vapor spinning for several days. Where does the sustained force come from? The centripetal force in ...
paki eng's user avatar
  • 139
0 votes
1 answer
69 views

Coriolis effect and Cyclones

The Coriolis force predicts that winds in the northern hemisphere should be deflected in a clockwise pattern and winds in the southern hemisphere should be deflected in an anti-clockwise pattern. Why ...
Debanjan Biswas's user avatar
1 vote
1 answer
162 views

How close to a lightning strike to be perceived at 140dBP, or to risk permanent hearing loss?

I was caught in an electric storm last night while camping. The time between flash and thunder must have been 3 seconds or less at least five times. (The nearest hill peak which could have been ...
novice's user avatar
  • 111
0 votes
0 answers
29 views

How much more voltage is required, theoretically, for a lightning bolt to strike than is actually observed/detected?

Scientists are always saying that they cannot fully explain how lightning works, especially when it comes to the fact that there doesn't seem to be anywhere near enough potential difference between ...
Kurt Hikes's user avatar
  • 4,435
1 vote
2 answers
251 views

Bernoulli equation and wind

Bernoulli equation is often used to explain how rooftops are blown off during tornados: the usual explanation is that the high speed of the wind il related to a lower pressure outside the house, ...
Dario's user avatar
  • 172
3 votes
1 answer
74 views

Why does relative humidity appear limited for temperatures above 80°F?

I recently compiled ten years of NOAA local climatological data. I noticed that the maximum relative humidity dropped linearly from 100% at about 80°F to 20% at about 110°F. Nothing obvious comes to ...
Nathan Bevan's user avatar
1 vote
0 answers
71 views

Forecasted temperature in the shade vs. theoretical temperature in the sun

I understand that different objects absorb different amounts of light (blackbody absorption). I wonder how feasible it would be to calculate the approximate temperature in the sun based upon the ...
OxC0FFEE's user avatar
  • 111
0 votes
1 answer
33 views

Is there a formula describing corona effect that naturally occurs during storms?

Imagine we have a tree during thunderstorm. Due to electric field in the atmosphere, a corona discharge appears on top of it. My question is: is there a formula describing this effect? I've already ...
realGuybrush's user avatar
1 vote
0 answers
22 views

Oxygen condensation on Earth

I am getting interesting results using the Clausius-Clapeyron relation to calculate the saturation vapour pressure of diatomic oxygen. I am using the following values: 214kJ/kg for latent heat of ...
Redirectk's user avatar
  • 357
2 votes
1 answer
485 views

Moist adiabatic lapse rate

Wikipedia gives the following equation to calculate the moist adiabatic lapse rate $\Gamma_w$, assuming that there is only one condensible gas (water vapour) mixed in the "dry air": $\...
Redirectk's user avatar
  • 357
1 vote
2 answers
124 views

Katabatic Wind: if the ground "radiates" it's heat during the night, why doesn't the air above it warm?

In this picture (from EasyPPL mock exam) and in a few other sources (e.g. https://www.britannica.com/science/katabatic-wind) it is stated that at night, the ground radiates heat and the air passing ...
hudec117's user avatar
0 votes
1 answer
134 views

Calculating pressure in high/low pressure systems

I don't understand how to calculate the surface pressure in high/low pressure systems. For example, let's say we have a planet without oceans whose surface is completely flat. Then at every point of ...
Redirectk's user avatar
  • 357
4 votes
2 answers
416 views

Can low lying clouds increase the distance of the radar reach from 18 to 120 km?

I have seen an article (sorry its Russian) claiming that low lying clouds have increased the distance of the radar reach from the normal 18 km till as far as 120 km. This allowed the military ship to ...
Nightrider's user avatar
1 vote
0 answers
24 views

Propagation speed of isobaric mixing?

Question So I was trying to model the following. Lets say I have a gas box where the partition box has just been removed as shown below: Both gases are of the same species the difference being the ...
More Anonymous's user avatar
0 votes
0 answers
21 views

Converting Weather Data for Better Modeling

I am trying to use weather data to develop a better model for plant growth. Here is an example daily average solar insolation (W/m^2) vs cumulative daily insolation readings: The cumulative ...
Chris Barry's user avatar
-2 votes
2 answers
64 views

Filling the empty bottle with hot air

If I were to fill the empty empty bottle with hot air, how can it be done? If I leave the bottle out in the sunny weather, will the bottle fill with hot air? When I am filling the empty bottle with ...
Kıvanç Cantimur's user avatar
5 votes
2 answers
377 views

How much solar irradiance do clouds block from reaching the Earth's surface?

Consider a fixed point in the Milankovich cycle and the solar cycle, a fixed Earth-Sun distance, and a fixed horizontal location on Earth, and assume that the Sun is at the zenith for that location. ...
tparker's user avatar
  • 47.8k
3 votes
0 answers
62 views

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 ...
Buzz's user avatar
  • 16.2k
1 vote
1 answer
101 views

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 ...
septimyr's user avatar
0 votes
1 answer
411 views

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 ...
JD_physics's user avatar
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 ...
sasquires's user avatar
  • 340
0 votes
1 answer
94 views

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 ...
Y Z's user avatar
  • 1
4 votes
0 answers
48 views

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 ...
Hauke Reddmann's user avatar
0 votes
0 answers
29 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?) ...
ifffam's user avatar
  • 1
5 votes
1 answer
722 views

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?
BMc's user avatar
  • 107
0 votes
2 answers
2k views

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'...
Crystal King's user avatar
-1 votes
1 answer
51 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 ...
SPARSE's user avatar
  • 113
0 votes
0 answers
157 views

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 ...
David M's user avatar
6 votes
1 answer
258 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 ...
Camille Goudeseune's user avatar
0 votes
1 answer
137 views

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 ...
JHT's user avatar
  • 78
1 vote
1 answer
140 views

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 ...
Lost's user avatar
  • 1,441
7 votes
1 answer
551 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 ...
Vignesh Sk's user avatar
1 vote
0 answers
34 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 ...
R1W's user avatar
  • 137
1 vote
2 answers
333 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 ...
Bigbadant's user avatar
0 votes
1 answer
170 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 ...
Natavi's user avatar
  • 125
0 votes
0 answers
51 views

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 ...
feetwet's user avatar
  • 922
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 ...
Jeffrey's user avatar
  • 993
2 votes
1 answer
146 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 ...
Johnny5ish's user avatar
3 votes
3 answers
1k 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 ...
Ankit's user avatar
  • 8,196
1 vote
1 answer
88 views

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, ...
HelloWorld's user avatar
0 votes
2 answers
585 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 ...
mathLover's user avatar
  • 366
1 vote
0 answers
72 views

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 ...
Mikhail Gaichenkov's user avatar
0 votes
0 answers
83 views

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 ...
user avatar

1
2 3 4 5