Questions tagged [wind]
The flow of air with respect to the ground. On the surface of the Earth, wind consists of the bulk movement of air.
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Could irrigation stop the Santa Ana winds?
The Santa Ana winds flow down mountain slopes, growing ever hotter as they descend. To my amazement, popular explanations of these winds even attribute them to specific mountain passes. Suppose for ...
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1answer
62 views
Would the atmosphere move rigidly with ground if you ignored wind?
I know this sounds basic but I've wondered about this for a long time and I'm still confused.
In aviation, air speed is ground speed minus wind speed. If wind speed is zero, air speed equals ground ...
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Is it possible to detect Coriolis effect using a Wind Rose?
I once learned in high school that the area where I used to live experiences the Coriolis effects of the air movement above the city. I never paid attention to this before, but I recently heard about ...
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1answer
42 views
How to find the top level of the planetary boundary layer in WRF?
I am working on WRF_Chem, I would like to calculate the concentration of CO2 just in the Planetary boundary layer(I mean, I want to calculate CO2 from surface to top of PBL).in WRF How can I calculate ...
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How to find inertial advective component of ageostrophic wind in natural coordinates
How do you derive the components of the inertial advective wind in natural coordinates?
The vector form of the inertial advective wind is:
I have been able to find the components in cartesian ...
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21 views
What is the westerly index?
This was asked in aviation stack exchange and the best answer (credit:ymb1) was:
The westerly index is the Trenberth Z1 index (Trenberth 1976), which is the departure of the monthly mean pressure ...
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1answer
55 views
Can air be slowed down by Fricton? [closed]
Can wind/air that is moving at average speeds be slowed down by the cause of Friction? Also, Can Air bubbles in water be slowed down because of Friction? Please cite your sources.
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Why do trees break at the same wind speed?
Several people have independently mentioned to me that all trees break at the same wind speed. This phenomenon is independent of type and size of the tree. Supposedly, Galileo already had described ...
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27 views
SWAN doesn't run [duplicate]
I'm Ocean Engineering Master Student. I'm not an expert in SWAN. I have some problem with it. Previously my result like rotated so I take another option to make grids using GridBuilder but SWAN doesn'...
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53 views
SWAN WAVE model: Strange result
I'm Ocean Engineering Master Student. I have some problems with my research. When I plot the result it is rotated. The color blue one is land. This my script, what should I do to fix the problem?
<...
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1answer
78 views
Why does wind direction change in a front? [duplicate]
Plenty of answers answer the question that it happens but I can't find a good answer as to why the wind shifts during the passing of a front.
For an extreme example see:
(in Dutch, x is hours and y ...
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Weather measurements of how long ago affects the amount of rainfall? (Which lags of temperature, precipitation, windspeed, radiation. humidity. )
I am trying to predict the amount of rainfall using weather measurements (temperature, precipitation, humidity, wind speed, surface radiation).
For long term, midterm, and short term predictions, ...
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97 views
What are the latest developments about global stilling?
I recently learn about "global stilling", i.e. the fact that surface wind speed tends to decrease since the 80s. It was in this article, but it's from 2010. The Wikipedia page also seems a ...
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1answer
302 views
What is the explanation of using pressure units (hPa) to express height when dealing with wind speeds?
I am trying to understand how prevailing winds and jet stream currents are formed and how they are varying in speed and direction.
When looking at different wind speeds at different altitudes on ...
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1answer
60 views
Is it meaningful to assume static pressure to be constant along a streamline?
I am looking at Bernoulli's equation formulated in two dimensions, which reads
$$\frac{v^2}{2}+c_p\theta_0\pi+gz \equiv \mathrm{const.}$$
along a given streamline $\gamma$, where $v=|\mathrm{v}|$ for ...
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144 views
Derivative of Exner function
In chapter 13.1 in 'Mesoscale Meteorology in Midlatitudes' (Markowski and Richardson,2011) they use a Bernoulli equation and the hydrostatic equation and a lot of assumptions to derive an equation ...
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320 views
Wind rose WRF-PYTHON
I'm trying to plot a windrose but I don't know how to get the variables ws and wd. Is there any variable in the wrf output that can be used to make a windrose?
I tried with 'wspd' et 'wdir' but I ...
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Asian South West Monsoon - Rainfall in South East Coast of India
So Indian peninsula has v shaped mountain ranges. Western ghats and Eastern ghats as shown in the picture.
During Summer Monsoon, the wind flows from Indian ocean to land mass, and due to Coriolis ...
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Why are there waves in seas towards shore - even in night?
Waves are mostly caused by Friction of wind on surface of water.
Wind blows from sea to land in day and land to sea in night due to pressure and temperature difference.
So it is intuitive why there ...
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Predict wind speed in a forest based on speed over and under canopy?
I am trying to understand the calculation of the wind speeds at forest edge. I am pretty new in wind simulation and profiles in general, so I am sorry if asking simple questions.
I have found that ...
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1answer
177 views
SWAN wave model: HSIG is strangely low
I have a question about SWAN wave model, I tried to ask it at the SWAN mailing list, but with no luck, so I'm asking here.
First of all I have to admit I'm not a professional SWAN user. All the ...
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1answer
2k views
Plotting ERA5 U/V Wind Data Using Python
Hello Earth Science Community,
I am a beginner Python programmer trying to plot a single time step of 10m surface wind data I grabbed from the ECMWF ERA5 reanalysis single level dataset in Python 3.8....
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63 views
Short-term forecast of Europe by using synoptic charts
I should make a short-term forecast of Europe by using synoptic charts. I'm finding it really hard so I'd be glad if you help me.
'В' means high atmospheric pressure
I'm trying to figure out the ...
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1answer
115 views
Why do wind speeds often jump from 20 knots to 40 knots
Looking at the BBC weather forecasts I've often noticed that strong winds will often be over 40 knots (for the UK at least). Most of the time (nearly always) the wind will jump from 18-22 knots to ...
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1answer
69 views
Converting Wind Movement to Wind Speed
I'm looking through historical weather station information from NOAA, and I notice some stations do not have wind speed information but do track Wind Movement(WDMV) over a 24 hour period in kilometers....
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2answers
294 views
What determines the direction of wind [duplicate]
What determines the direction that a wind blows?
I understand that the nature of my question is immensely broad but I see no other way to phrase the question.
The question surfaced in my mind when I ...
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1answer
872 views
Question about the sign of the shearing deformation terms
I have the following equation for the shearing term of the deformation zone in meteorology. The reference is this link:
http://www.zamg.ac.at/docu/Manual/SatManu/main.htm?/docu/Manual/SatManu/CMs/Def/...
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1answer
106 views
What is the physical meaning of second moment of wind velocity?
I have been reading some documents about meteorological data and many of them mention the second moment of wind velocity.
I guess it has to do with the way the wind is changing but in such case I ...
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1answer
73 views
Where can I find wave height/period, current velocity and wind speed/direction data at the Qiangzhou strait in China?
I'm looking for time series of wave height/ period, velocity currents and wind speed/direction specifically for the Qiangzhou strait in China.
Global data sets could also work.
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3answers
376 views
Temperature Advection using finite differences with gridded data
Advection of a scalar quantity, such as temperature (T), by the horizontal wind, is defined as follows:
$-\textbf{U}\cdot\nabla T$
where $\textbf{U}$ is the horizontal wind vector, $\textbf{U}=(u,v)$...
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1answer
120 views
How to strong winds cause baroclinic intensification in the upper ocean?
Below is an excerpt from The Biology of the Indian Ocean, Bernt Zeitzschel, Sebastian A. Gerlach
The more vigorous atmospheric and oceanic circulation during the SW
monsoon causes not only the ...
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What is the accepted measure for Wind Coherency (Strength and Direction)
I have wind data from a Met station (Speed and Direction), and I'm looking for a way to characterize a strong coherent wind.
AKA - Wind that averages 12 m/s out of the East for 2 days would have a ...
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1answer
216 views
Judging wind speed based on flags and inland-water observations
About a year ago, I took this video along the Hudson river in NY, and I'm trying to figure out the Beaufort number based on the water and the flags.
https://www.youtube.com/watch?v=nqjvTALRWW8
The ...
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58 views
Find True Wind from ship course and observed wind
Assume that I am sailing in a ship where I know the course of the ship & speed of the ship and observed wind direction & speed using Automatic Weather Station fitted on mast. I would like to ...
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1answer
454 views
If storms form above low pressure regions, why doesn't the eye of a hurricane, a low pressure region, have any storms?
If this is due to the Coriolis Effect, my other question would be how does the wind go upwards to form the storm clouds?
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1answer
61 views
Deep sea pumps that work on wind power, can they control the weather?
If they used wind power to bring up cold water from far under the ocean in the day time and spray it on prevailing winds going into land, could they make it rain more in arid regions? What weather ...
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3answers
185 views
At the same speed, is a tornado as dangerous as straight wind?
If we have a place with wind at a given speed, and a tornado at the same speed, are they equally dangerous, or the tornado is more powerful?
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160 views
Where on Earth does the wind only blow one way?
Is there a place on Earth that if the wind is blowing its only blowing (here is the twist) in the same direction from the ground to 53 km high?
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1answer
57 views
How would a particle travel in a hurricane?
How would a particle other then water travel in a hurricane? At what buoyancy or height would a small air born life preserver be safe from the ground in a hurricane? How fun would that be?
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1answer
493 views
Why is there no desert in Southeast China?
Arabia, Sahara and Southeast China and India all are on the tropic of Cancer yet Southeast China and India are not deserts. I know that India is not a desert because of monsoon wind which causes heavy ...
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Why do rivers sometimes travel down the opposite side of the mountains from where the rain happens?
My teacher explained that when wind coming from the ocean gets blocked by a mountain it makes rain on one side of the mountain, like in the image below. This rain leads to the creation of rivers.
(...
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4answers
2k views
Does the Coriolis Effect affect a wind from East to West?
I'm studying meteorology for a pilot license and there I was taught as a rule of thumb that wind at higher altitudes is approximately turned 30° clockwise to the wind on the surface due to the ...
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51 views
For how long can the wind blow unabated on a “trade wind route”?
Take a specific point at sea level (less than 100 meters above it) on a "trade wind" oceanic route. For example, somewhere on Labrador-Ireland route, at roughly 50 degrees of latitude north. Let's say,...
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1answer
64 views
How is wind made [duplicate]
Everyone surely enjoys waves in the beach, but one question that has always been hovering around my head was about the wnd.
I have always been told that waves are formed by wind and all, but then ...
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1answer
950 views
How big does a lake have to be to have its own Sea Breeze?
How big does a body of water need to have a sea breeze? Is there a chart on sea breezes wind speed that include lakes?
Could a circular lake create enough sea breeze to create a wind vortex in the ...
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1answer
41 views
What is an 'obstacle vista diagram'?
Currently I do some research about SODAR and at this paper, the author wrote (p. 1502f):
A site should be relatively clear of obstacles that could act as
potential fixed-echo reflectors. If that ...
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What would happen to the Subtropical Ridge/Horse latitudes and Polar front if the Earth was rotating 5% faster?
Would they move towards the Equator/Poles? Stay in the same place?
What about if the Earth was rotating 10% slower?
Is there a rotation speed for Earth which will lead to 4 wind belts instead of 3 ?
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64 views
why does Earth have three wind cells instead of just one? [duplicate]
I wondered what causes three wind cells on earth -Hadley Cells, Ferrel Cells, and Polar Cells, instead of just a one big cell from equator to the pole?
I'd like a straightforward, intuitive ...
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1answer
202 views
What wind forecast datasets are available for forcing a wave forecast model?
I am trying to set up a spectral wave model for waves forecasting in the Mediterranean. I need the meteorological forecast for this region. I am aware of the ECMWF datasets. But unfortunately, only ...
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1answer
285 views
Why does wind blowing against a strong current create way bigger waves?
It's a well known fact that wind will cause very big waves if blowing against a strong current, for example in the gulf stream off the US coast, or in the bay of San Francisco with a very strong (5 ...
