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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0answers
80 views

How can I convert a CERA-20C total precipitation dataset of "monthly means of daily means' (edmo) to mm/month?

I downloaded an edmo dataset of 1 ensemble of the cera-20c model. I want to convert these data, which are in [m], to mm/month. Further specifications: 0.125/0.125 grid, -29/30/-30/31 area. Example of ...
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2answers
196 views

What happens if it rains above the boiling point of water?

The freezing point of water is 32°F. If it rains at a temperature lower than that, it will snow. However, let's say we dig a deep hole not filled with water that goes like 10,000 feet below sea level. ...
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0answers
26 views

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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3answers
3k views

How is it possible to use up the water in a region?

The Dead Sea, rivers in California and the Aral Sea are said to be shrinking due to water usage, e.g. for agriculture. Yet the water must go somewhere. After the fields are irrigated, the water ...
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1answer
326 views

How to calculate Wind direction from uwind and vwind?

How to calculate wind direction from uwind and vwind? if uwind and vwind are -1.82 , -3.18 respectively
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0answers
79 views

how to calculate the average moisture flux over a period of time

I wanna calculate the average moisture flux over a period of time. For example the average moisture flux over an entire summer. I don't have a meteorological background. I have a conceptual confusion ...
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2answers
4k views

Is spectrum of sunlight the same in the summer as in the winter?

Of course we receive less sunlight in winter, because the sun is lower in the sky, so the light has to travel through more atmosphere, and loses strength. Does this mean that the blue light is more ...
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1answer
72 views

Is it certain that hundred year floods have finite variance?

It just occurred to me to ask this. It's easy to get a statistical distribution that does not have finite variance. For example, you can sometimes get that when the thing that is measured comes from ...
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1answer
127 views

Are there “transparent” clouds?

Comments below this answer to the question Why are lightning towers at launch pads topped with big hollow tubes with spiral windings and not “lightning rod-shaped” lightning rods? link to a 2013 ...
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8answers
8k views

Is it possible to create an enclosed manmade weather system?

There are plenty of experiments, usually geared toward kids, that involve "making a cloud in a bottle" or something similar. These exercises are neat for what they are, but pale in comparison to the ...
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3answers
1k 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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2answers
318 views

What is are the benefits of map 500 hPa geopotential for weather forecasting?

From the weather forecasting perspective: what is the main reason for showing just map of 500 hPa geopotential? Are there any practical or theoretical reasons? Why do not show 600 hPa geopotential or ...
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1answer
119 views

What happens in the upper air when the altitude of the tropopause changes?

I know about the seasonal changes of the altitude of the tropopause as well as the differences by latitude. I thought the change at one location was a very slow process, but I just found upper air ...
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3answers
157 views

How to design an experiment to quantify back radiation from atmospheric carbon dioxide?

Based on our current knowledge of CO$_2$ and current instrumental techniques, how big would a laboratory sample of air with 400ppm of CO$_2$ need to be in order to quantify the back radiation from CO$...
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0answers
87 views

Are global temperatures, specifically between the two hemispheres, in balance?

I've anecdotally but repeatedly observed a certain balance between temperatures in the two hemispheres. For example, early this year (2018), while Europe was under a late winter spell, weather here in ...
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1answer
851 views

How does a 'fire tornado' form?

A 'Fire tornado' or 'Firenado' or 'Fire whirl' are a fearful feature of forest fires world wide. Having seen one up close, I can attest that they are both awesome and utterly terrifying, but I am ...
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2answers
91 views

What's the default meaning of “Valid” in NOAA weather map?

NOAA weather forecast maps often include a valid time period, e.g: "valid from time1 thru time2." However, many maps only indicate a single time, e.g: "valid time1." In the absence of other ...
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1answer
40 views

Projecting rectangular stereography centred on 42°N, 10°E

I am reposting from GIS Stack Exchange as here might also be someone who might help: I have a precipitation GRIB2 file obtained at EUMETSAT H-SAF I am able to decode it to ascii but the software I am ...
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1answer
4k views

How to calculate water vapor flux divergence from temperature, relative humidity, u wind and v wind?

I have temperature, u wind, v wind and relative humidity. I am wondering to calculate water vapor flux divergence and convergence. Would anybody kindly help to find our a solution for this?
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1answer
84 views

What kind of rock or stone is this? Where did it come from? [closed]

I found this on the side of the road in Oregon, i think it was left or forgoten about thats why it was left there but it has crystal pockets, multiple colors, some smooth sides, perfect circles and ...
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0answers
94 views

Difference between GDAS and GFS data

What is the exact difference between GFS 0.25 and GDAS 0.25 data which is available in http://nomads.ncep.noaa.gov/. And are the GFS 0.5 and 1 degree data available in the above url and here the same?...
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0answers
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Why do tethered aerostats have lower persistence than stratospheric balloons?

We have been thinking of using Aerostats/Balloons for an environmental monitoring project in our university. We have been considering 2 options: Tethered Aerostats (which fly upto 1 km) and ...
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2answers
388 views

Are weather forecast models more accurate for either high or low temperatures?

The other day our low temperature for the day was ~10 degrees F below our forecast low. I've noticed this before in the winter, especially when temperatures start to go below 0 degrees F (-18 degrees ...
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1answer
143 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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How to create Indonesian environmental conditions in India?

Need to create and maintain Biofloc for fish farming in India, it's really successful in Indonesia and I believe it's due to environmental conditions. Can we replicate the same in India?
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4answers
741 views

Do winds behave like waves?

Like a sound wave, there are compressed and dilated regions in the air. But do compressed regions also occur in winds. If one considers squalls, they feel like a compressed region of air. Perhaps they ...
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1answer
82 views

Does thermal bubble initiated in WRF dissipate over time?

I am running idealised supercell simulation using WRF model. The supercell storm is initiated with a thermal bubble. I just wonder if the thermal bubble is only affecting the initial temperature. I ...
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1answer
105 views

Why don't tropical cyclones hit Hawaii?

Image by Wikipedia user Citynoise using NOAA data. If you look at this map of tropical cyclone tracks, you'll notice that there's a gap in the central northern Pacific where tropical cyclones ...
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1answer
328 views

Has a hurricane or cyclone ever reformed after passing over a large land mass?

Hurricane Michael recently hit Florida as a Category 4 storm, and after the remnants passed across a great deal of the east coast of the United States it appears to have re-emerged into the Atlantic ...
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1answer
63 views

On what basis are hurricanes,cyclones or typhoons named? [duplicate]

now its well known that common names are used to name weather storms but on what bases are they named ? is it the person who first notices them ? Is it the the most common name in the region where the ...
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0answers
102 views

How do the Madden Julian Oscillation (MJO) waves originate?

I was reading about tropical cyclones and tropical waves and there I saw a study mentioning its relationship with MJO activities. I saw several research papers which discuss about MJO waves. They only ...
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1answer
58 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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1answer
89 views

How long does it take to refresh the entire water supply in the Earth's atmosphere?

Water in the atmosphere is present as vapour, liquid and ice. It is just a small amount of the Earth's total water supply. I'm wondering how long it will take to rain down all the water from the ...
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5answers
4k views

How to reduce the atmospheric temperature artificially?

Is there any gas/substance which absorbs/reduces atmospheric temperature? Ozone filters UV rays from the sun light and allows in infrared rays. In my knowledge these infrared rays are the cause of ...
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1answer
213 views

Why is cold air fast in an occluded front, but slow in an anti-cyclone?

I've read that cold air moves faster than hot air, for example in an occluded front. But in case of anti-cyclone encountering a cyclone it appears that the cold air of the anti-cyclone moves very ...
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0answers
54 views

Are clouds more common at night?

Clouds obviously have a strong effect on surface temperatures. By blocking sunlight they can decrease the temperature by several degrees. At night they have a blanket effect that traps warm air and ...
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2answers
1k views

Why do meteorological seasons start earlier than astronomical seasons?

In meteorology the seasons always start at the beginning of the month the astronomical seasons start. The astronomical seasons start around the 21st in a month so I guess it would make more sense to ...
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0answers
45 views

How to calculate water vapor budget for a selected region in GRADS or MAT Lab

I need to calculate water vapor budget for a selected region. Can anyone suggest a specific link or code for the above mentioned tools please. I have seen a link for NCL but i am not familiar with ...
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0answers
26 views

what changes in the weather prior to thuderstorms?

What changes in the weather prior to thunderstorms (day before, for example)? It seems humidity goes up and temperature but is there anything else?
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1answer
121 views

Why do hurricanes hitting the US East Coast seem to go north once hitting land?

Question says it all really. It appears that every hurricane hitting the US East Coast directs itself north once on land. Hurricane Florence is predicted to hit North Carolina then turn toward Canada ...
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1answer
691 views

How could humans alter storm intensity or direction other than cloud seeding?

I am familiar with the concept of cloud seeding, where precipitation can be induced with aerosols, thereby altering storm intensity further downwind. Are there methods that could be used to ...
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0answers
47 views

What is the most powerful kind of extratropical cold core cyclone and why?

I want to understand what makes for a very strong extratropical cyclone. So which kind on Earth is the strongest in terms of windspeed or pressure? Southern ocean storms, nor'easter, European wind ...
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2answers
303 views

Are there websites where I can get “lightning frequency maps” in near-real time (worldwide)?

I have an NASA Inspire VLF-3 radio receiver kit that I'm going to put together. It amplifies VLF electromagnetic signals that are already in the audio frequency range and makes them audible. One of ...
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1answer
55 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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0answers
243 views

Why does this contrail diverge and then converge?

I observed this contrail above me today, and I noticed that the two inner contrails diverge outwards to merge with the two outer contrails. Then, as the contrails dissipate after several seconds they ...
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0answers
60 views

What colors can lightning be and what causes the different colors?

I've always thought of lightning as being either bright white or yellow in color. However, in the summer I've also seen lightning appear red as so called "heat lightning". What I'm wondering is what ...
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5answers
13k views

Rain without clouds?

Is it possible to have rain without visible clouds? As far as I know, clouds are liquid water and eventually the liquid water in them falls down, producing rain. Therefore one would expect clouds ...
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3answers
185 views

Can weather radar be used to track swarms other than mayflies?

Along the Mississippi River swarms of emerging mayflies have been seen on radar. The radar and image below are from a July 11, 2017 emergence near LaCrosse, Wisconsin. On the radar you can see the ...
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1answer
187 views

Does the global temperature vary daily (hotter and colder days)?

Earth's current average global temperature (i.e. including hot deserts and cold polar caps) is reported be somewhere between 14°C and 16°C (depending on sources and methods). This temperature varies ...
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3answers
21k views

Why does the Inter tropical Convergence Zone shift?

I am currently learning at school about the climatic conditions (mainly winds, difference in pressure, Coriolis effect, etc.) that cause and affect the monsoons received by India. One of the factors ...