Questions tagged [meteorology]

The study of how the earth's atmosphere works, including weather forecasting. Use this tag for questions about the earth's weather. When asking questions specifically about the atmosphere, also include the [atmosphere] tag.

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107 views

To what degree do large lakes influence precipitation levels compared to the ocean?

I was wondering what percentage of precipitation could be estimated to have been contributed by large lakes such as the Great Lakes or Lake Baikal in the immediate vicinity of said lakes (say, within ...
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407 views

Do U & V vectors differ depending on GRIB layers (wind vs current)?

Essentially I would like to know how current direction "DIR C" and wind direction "WDIR" for gribs is computed. I'm trying to compute some angles from u and v vectors in grib files. My understanding ...
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47 views

Topographical model of a wind-farm [duplicate]

Has anyone ever built and tested a topographical model of a 200 mile radius with a wind-farm in the middle to see how much wind speeds and wind direction change when the farm is active compared to ...
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376 views

How to compute the moisture flux convergence at a grid point? [duplicate]

I have $u$-wind, $v$-wind and specific humidity. I would like to compute moisture flux convergence at a grid point. So I need to compute the value of $q(\frac{du}{dx} + \frac{dv}{dy})$ My question is ...
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88 views

How to calculate column averaged kinetic energy?

I have u-wind, v-wind and w-wind at 11 pressure levels (starting from 1000 to 100). I would like to calculate column averaged kinetic energy. I have the formula to do this as: $KE=\frac 1{g(Ps-Ptop)} ...
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0answers
51 views

What kind of storm tracks produce snow in the eastern United States?

What storm tracks are favorable for snow in the eastern United States? Articles like this one on a winter storm in the Northeast in 2011 indicate that storm tracks are important in snowfall amounts. ...
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0answers
21 views

improving image quality from AREA GOES imager data using WCT or other program?

I'm doing a project using two days worth of GOES 13 satellite data during June, 2016. I'm trying to make an HD animation using data from bands 1 and 4. I've been using the Weather & Climate ...
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0answers
360 views

Great Lakes Earth: The Americas [closed]

Related to If the Oceans Were Deeper The Appalachian Range, at first glance, doesn’t seem so different—low-lying hills covered in forest dominating the eastern landscape. However, they are taller—7,...
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0answers
137 views

Correlation of El Nino and south indian monsoon

A recent article in New Scientist reports the following claim made by Wenju Cai at CSIRO Melbourne. Southern India is having a lot of rain as it goes into winter, having come out of the dry ...
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0answers
51 views

What determines the number of Hadley cells on a planet? [duplicate]

I know it has something to do with the rotation speed, but what exactly? And why?
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1answer
90 views

Southern Hemisphere climate

Does oceanic and land mass positioning affect tropical storm evolution in the southern hemisphere? And, do cold fronts migrate latitudinally " upwards " the way they drift "downwards" in the northern?
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2answers
815 views

How to find/calculate the yearly evaporation of a given area?

What I am asking, is exactly the opposite of the yearly rain. It is well measured and it has century long databases. Consider a given, generally dry area. What I am trying to know: if this area ...
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3answers
324 views

Websites providing visual weather data

What websites are there providing visual weather data? The question actually contains the past and future weather. The purpose is for this question is to provide a list of easy-to-access websites that ...
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1answer
241 views

Large Scale lightning Strikes from Cloudless or Near Coudless Skies. How Does it Work?

It is reported in the media that currently in Australia there are dozens of wildfires caused by lightning strikes. I am familiar with the mechanism of ordinary British lightning involving cumulonimbus ...
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2answers
57 views

What data of agricultural yield to use for India?

I am trying to understand the role of various meteorological factors on agricultural yield over India. Is there a dataset available directly or an indirect proxy of agricultural data, maybe satellite, ...
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2answers
88 views

How should one compare the comfort of climates?

Is there a way to measure the overall feel of the weather for a place? Suppose that: Place A has Temperature $33^o C$, Humidity $57\%$, Wind $14\;km/hr$, and Precipitation $20\%$ Place B has ...
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1answer
74 views

Is there a name for this weather phenomenon?

I was wondering if there was a name for the effect I’ve noticed over a lake in really cold weather. You can see white wisps over it, which I think is mist from the lake rising into the air and ...
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2answers
189 views

When there is snow on the ground, can a hurricane still form?

Where there is snow on the ground, it is a clear indicator that winter in near or already here. Meaning the oceans waters will be colder. But can hurricanes still form in such weather?
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1answer
73 views

In meteorology, are satellite data “better” than reanalysis data?

More specifically, can it be argued that satellite data are more reliable because they are direct measurements of physical quantities, while reanalysis data depend on the processing and merging of ...
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1answer
47 views

What is the relationship between the derivatives of specific volume and potential temperature with height?

While studying about atmospheric waves, I found a passage in my book in which a equation involved the term $$ \frac{1}{\alpha }\frac{\partial \alpha }{\partial z}$$ where $\alpha$ is the specific ...
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1answer
43 views

Longitudes and latitudes are not regular in WRF-out files

I am working by WRF-ouput files (wrfout_d01_2016-01-16_00:00:00). I extracted and printed latitude and longitude data from the "wrfout_d01_2016-01-16_00:00:00", ...
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1answer
416 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
4k views

What factors affect daily temperature range?

I was wondering if the difference between the low temp and the high temp depended on just the humidity content and the altitude of a place. Or are there more factors? What about the time of year? How ...
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3answers
2k views

El Nino in the Middle East

According to reports and charts meteorological phenomenon El Niño is close to Iran, but the question is, El Niño phenomenon in Iran is likely to achieve? What are the consequences?
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1answer
137 views

Tornadoes meeting with an Immovable, Unbreakable, Large Cube

What would happen to a tornado if a Large, Immovable, Unbreakable and Obsidian Cube was in its path? The tornado is on a flat plain... but is heading towards the cube. By large, I mean the length of ...
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1answer
39 views

What is the “forecast hour of product”

The NCEP website describes the file naming format of the GFS forecast data. https://www.nco.ncep.noaa.gov/pmb/products/gfs/ What does "forecast hour of product" mean?
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1answer
73 views

Are there areas of desert sands which experience blizzards?

Building off of another question I recently asked (Is there sand in Antarctica?) I want to ask a broader question coming from the same motive described there. Are there desert sands that experience ...
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2answers
382 views

What is the highest balloons possible in a chain?

The BU60-1 balloon attained an altitude of 53.0 km (32.9 mi; 173,900 ft). Weather permitting, would a series of climbable balloons in a chain be able to be linked from the ground to that height of ...
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1answer
247 views

Severe storm predictions: What meteorological considerations go into hazard assessments? [closed]

In the United States the National Weather Service (NWS) Storm Prediction Center (SPC) now has 5 categories for the threat of severe storms. These five categories replaced the previous three ...
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1answer
1k views

Does “atmospheric forcing” have a stated definition?

I often come across the words "atmospheric forcing" or "meteorological forcing" in journals. I presume it just means the influence/impacts of the atmosphere upon factors such as climate, wind ...
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2answers
309 views

Appearance of Tornado

Does the appearance of a tornado come from the dust or is there some characteristic of swirling wind? Additionally many experiments shows a tornado-like phenomena in a jar of water, is this possible ...
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1answer
591 views

How to perform precipitation data analysis? [closed]

I want to make precipitation data analysis for the Latvian territory. I only have meteorological stations and reanalysis data. My data from meteorological stations are in the format: ...
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2answers
70 views

How to search for the nearest non nan value in 2d xarray dataset

I have a 2d xarray dataset and I am having several nan values in the dataset. These nan values need to be filled with the nearest non-nan values in the 2d array. How do I do this? I am trying to ...
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1answer
250 views

Why is the pressure on the poles higher in Summer and lower in Winter?

Just to give context, this was not my original question but one that I ended up stuck with while trying to find a cause for the following observation (which is almost universally true for temperate ...
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1answer
265 views

Does Climate Data Store provide daily mean of ERA 5 reanalysis data?

I have been meaning to download the daily mean of ERA 5 reanalysis data from the Copernicus Climate Data Store, but couldn't find it. I need the data on pressure levels and currently I am ...
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1answer
191 views

Heat at High Altitudes

Why does the temperature of let’s say 85 degrees Fahrenheit in southern California feel hotter at 7,500 ft elevation than it does at sea level?
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2answers
162 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
172 views

Do cloud formations change depending on the season?

I'm currently working on some software for cloud masking, and thus far I have only been using satellite data as recent as spring (northern hemisphere). However, I'm wondering if cloud coverage or ...
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1answer
67 views

How big of an event is needed to trigger a long winter?

Could a small meteor or natural nuclear explosion melt an ice cap on Earth to trigger a mini ice age without the event being observed by people? Can the Earth have an overlaying thermal cycle that ...
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1answer
76 views

Why has the average low for the hottest months in Clearwater Florida about 5 degrees higher than the historical average?

Look up Clearwater Florida on Wikipedia and it gives you the average low for the Months of July and August as being 74.2F. About 3-4 years ago I picked up running as a main hobby and the temperature ...
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1answer
124 views

How can I implement a visualization of archived convective data from numerical weather models?

I've always found geographic visualizations of surface/mixed-layer CAPE models and other weather data to be incredibly interesting. Here's a map featured by the Capital Weather Gang over at the ...
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1answer
82 views

Dynamic meteorology - calculating air temperature based off falling air

I'm not sure if this is the correct place to ask this. Basically 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 ...
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1answer
104 views

Could a large burst of super-heated or super-cooled air cause tornadoes to fall apart?

We know how tornadoes form: when areas of hot air and cold air mingle, causing rotation. We can even see them form on the radar. Yet, for all of our technology, we can't stop such events from ...
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1answer
107 views

Can we change the temperature in atmosphere?

In the laboratory we can maintain the low level temperature like 0 to -13 degrees. Like that can we do this process in atmosphere. For instance atmosphere temperature is 35 degrees can we change the ...
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1answer
34 views

Rainbowish phenomenon outside my home

I took a photo of an amazing sight I had never seen outside my home ( southern india ) but I could not tell if it was a rainbow type thing or an aurora borealis. Also if it was to be a sun dog , ...
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1answer
24 views

Ice Water Content from GFS file

I am working my way through this paper: http://downloads.hindawi.com/journals/amete/2017/8707234.pdf Equations 10 and 11 require the ice water content. I can't find it in the GFS grib2 file ...
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1answer
147 views

How likely is Earth to naturally reverse climate change in the next 2 decades?

A new decade question: given that the “mini ice ages” were triggered by volcanic activity, how likely is it that we will experience similar levels of volcanic activity over the next 20 years? In ...
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1answer
98 views

How to de-stagger (or unstagger) WRF wind fields?

I am trying to calculate wind speed from the U and V wind components of a Weather Research and Forecasting (WRF) simulation. However, I came to realize that some ...
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2answers
115 views

Why is the ice on a frozen lake sometimes cracked?

The YouTube video Skating Lake Baikal, the world's deepest lake - BBC News shows a very heavily cracked lake. It doesn't just appear to be a fault line. It appears to be an actual crack that started ...
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1answer
437 views

Does WRF simulation use sigma or eta vertical coordinate system?

Could you tell me what the WRF's vertical coordinate system is? Sigma or eta? According to the User WRF Guide document, uses a terrain-following hydrostatic pressure coordinate while the WRF ...