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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3
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1answer
21 views

Does saturation mixing ratio change during adiabatic ascent/descent?

Does saturation mixing ratio change during adiabatic ascent/descent? I think the mixing ratio ($r_v = \rho_v/\rho_d$) is constant as long as no water vapor is condensed out, but saturation mixing ...
3
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1answer
47 views

How accurate is ERA5 weather data?

We are using weather data to feed building energy models. Historically, we would do that with weather from the closest weather station, which can be far away (up to 100 km, I guess). Recently, we've ...
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1answer
242 views

Are halcyon days an actual phenomenon?

According to Greek mythology, halcyon days are the seven days in winter when storms never occur. [Wikipedia] I assume that Ancient Greeks noticed a period in winter during which the weather was ...
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0answers
55 views

Could the Pineapple Express collide with cold air, resulting in extreme snowfall?

The pineapple express is a colloquial term for the strong atmospheric river produced by the polar jet stream, which drives excessive moisture and warmer air towards north-western North America. With ...
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0answers
35 views

Interpretation of certain maps related to weather

I am a student Pilot and basically we are asked to give weather briefing every morning using the charts shown here: https://mausam.imd.gov.in/imd_latest/contents/satellite.php#. https://mausam.imd.gov....
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In terms of atmospheric pressure, why do pressure systems move and what factors affect the general pressure of an area?

With very limited background in the physics of air and weather, this question occurred to me for no particular reason. With that in mind, a simplified answer would be much appreciated. This weatherman'...
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2answers
24 views

Potential temperature constant in a well-mixed atmospheric layer?

Why is the potential temperature, defined as $\theta = T\Big(\frac{P_0}{P}\Big)^{R/c_p}$, constant in a well-mixed layer? I understand that the dew point temperature has to be parallel to a line of ...
3
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2answers
93 views

Pressure vs Temperature effect on humidity

I am a bit confused about pressure vs temperature effect on relative humidity. I know that air density is decreased with altitude, which means that there is more "space" between air ...
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1answer
65 views

How does Siberian High develop?

For what I know so far about this phenomenon, it's a super cold mass of dry air accumulating in Siberia and Far East of Russia from September to April. I want to know how it accumulates cold air in ...
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1answer
79 views

How exactly can one make out the direction of and temperature of winds [closed]

I am trying to make a fictional world, but I want to be as realistic as humanly possible with the winds and climate. So my question is, knowing various parametres, how exactly can I make out what ...
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0answers
54 views

Formation of Clouds in High Pressure Systems (Western Australia - Perth)

High pressure systems are normally correlated with stable atmospheric conditions with little to no cloud cover, but due to this minimal cloud cover, doesn't that open up the ocean / ground moisture to ...
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0answers
47 views

Is Global Mean Surface Atmosphere Pressure changed long-term by global warming?

We know the Global Mean Temperature is increasing due to climate change. But for the Global Mean Atmosphere Pressure, can we see an obvious trend?
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What was the weather like in Pangaea's equatorial regions ( i.e. 23 latitude North to 23 latitude South )?

I've been having this burning question about the tropical climate of Pangaea but not sure how to ask until now. So far I've read that the carbon dioxide levels back then were much higher than it is ...
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3answers
68 views

Do surface temperature inversions only occur in valleys and natural bowls?

When you read about temperature inversions online, you mostly hear about them trapping pollution in places like Salt Lake City, which is surrounded by mountains. That seems to be the case for most ...
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1answer
610 views

Why is the snow line higher in the Himalayas than on the equator?

Excerpt from WP page Snow line: "At or near the equator, it is typically situated at approximately 4,500 metres (14,764 ft) above sea level. As one moves towards the Tropic of Cancer and Tropic ...
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0answers
35 views

How does the lack of data about the Mesosphere affect our predictive knowledge of the atmosphere?

Out of all the layers of the Earth's atmosphere the Mesosphere is the hardest to collect data and experiment on, due to it's density being too much for satellites and too little for aircraft or ...
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0answers
31 views

Why does cloud cover seem to "ride" a wave that propagates westward near the equator in this video?

https://www.youtube.com/watch?v=wVRbeGc_6zM Notice that the cloud cover over Africa and South America is correlated in a way that seems to be highlighting some kind of large-scale easterly wave ...
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0answers
26 views

How does a layman differentiate between positive lightning and negative lightning?

Yes, there are different types of Lightning. How can general public/audience detect if a cloud to ground lightning strike was of positive or negative type?
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53 views

Is there a certification process for automated weather stations?

I'm in the market for a new automated weather station and of course there's a glut of them on the internet. I mostly will be using the data for myself and my own amusement but do plan to submit ...
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1answer
56 views

Calculating total daily rainfall from a tipping bucket rain gauge

I am trying to calculate total daily rainfall based on data from a tipping bucket rain gauge which is calibrated to a tip of 0.2mm. I have data giving the exact time that a tip is recorded and have ...
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4answers
72 views

Hourly historical weather data for USA

I tried Google BigQuery but it is at day level. Is there any source for hourly historical weather data for USA?
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1answer
60 views

Why is the isothermal layer being considered a part of the stratosphere rather than the troposphere or being an independent layer?

At altitudes from 12-20 km (7-12.5 mi) above the midlatitudes the temperature remains constant with altitude (minus 56.5°C in the ISA). This part is usually considered to be in the stratosphere, but ...
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0answers
34 views

Why is NYC so much colder than Rome despite being at the same latitude? [duplicate]

New York City and Rome are at about the same latitude, but their climates are different. Rome has subtropical climate and it doesn't snow in winter. NYC has temperate climate and it's extremely cold ...
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2answers
92 views

What is the relationship between air pressure and temperature?

I'm trying to reconcile a paradox regarding air pressure and temperature. On the one hand, compressing air heats it up, while expanding it cools it. So density and temperature are proportional. On the ...
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0answers
49 views

What kind of circumstances could lead to extensive flooding of the Fraser River in British Columbia's Lower Mainland?

This might be a better question for Engineering.SE. I know that flash flooding to the extent and intensity that is seen in the Midwest or South is more rare in the Pacific Northwest, because it was ...
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1answer
55 views

Gases descending from atmospheres

Earth’s lower atmosphere is rising due to climate change Temperature is the driving force behind this change, says Jane Liu, an environmental scientist at the University of Toronto. The troposphere ...
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0answers
28 views

Atmospheric gravity waves or cumulus cloud street?

I observed these clouds today (november 12, Belgium) and I was wondering if they could be caused by atmospheric gravity waves. How would you spot the difference between gravity waves and a cloud ...
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0answers
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I'm searching for a town with a climate similar to Walvis Bay, Namibia's precipitation-wise but about 4⁰C warmer in every month. What are my options?

I'm searching for a town with a climate similar to Walvis Bay, Namibia's precipitation-wise but about 4 degrees Celsius warmer in every month. What are my options?
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0answers
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How to convert $\ce{NO2}$ mixing ratio (ppmv) into $\ce{NO2}$ column density(moles/m2)?

I have a WRF-chem output with NO2 mixing ratio for 37 levels, for my analysis I need to convert it into into column density. How do I do that?
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1answer
43 views

Does total precipitation have different meanings?

I'm new in hydrology sciences and for my work, I have to differentiate solid precipitation time series and liquid precipitation from total precipitation time series. My data are from a meteorological ...
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0answers
19 views

How to best calculate ensemble spread with 2D data?

Sorry if this has been asked before, but I am looking through papers and websites and cannot find something satisfying. Say that I have 10 different ensemble members calculating geopotential height ...
5
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1answer
98 views

What causes these periodic high-pressure blobs along the west coast of South America?

I was looking through the Weatherbug atmospheric pressure map around 8:30 am ET on Oct 26 2021, and noticed this chain of small high pressure blobs along the west coast of South America. It was also ...
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0answers
32 views

Electric phenomenon when tornado funnel disappears?

A video of a recent tornado in Germany shows two points of glowing light appear at the end of the lifetime of a tornado, when the funnel is already almost entirely retracted. Here is a video link. The ...
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1answer
81 views

Software for spatial interpolation of temperature and relative humidity data from weather stations

I'm working with time series of weather data (specifically, min/max daily temperatures and relative humidity) recorded from weather stations over an area of about 200,000 km2. I would be interested in ...
5
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1answer
147 views

How to calculate sea level pressure from geopotential height?

For this, I am using python to plot and manipulate the data. I am using reanalysis data in a netcdf format for this problem. The data includes geopotential, for which I estimated the geopotential ...
2
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1answer
58 views

What is grib2 telling me?

I am having trouble interpreting the output of wgrib2. I was expecting this command to produce a set of four measurements: one for each corner of a box at the specified pressure level. Instead I got ...
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0answers
53 views

What causes the polar vortex to exist?

What causes the polar vortex to exist? I've tried to look this up online but I can't seem to find an answer.
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0answers
47 views

How to statistically downscale wind speeds?

Background I am trying to estimate wind speeds at a proposed wind farm site using the method described in this paper hyperlink here. The approach is summarized in figure 2 of the paper. Short Summary, ...
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1answer
36 views

Does increased water vapour in atmosphere increase the risk of hypoxia?

I recently found that each degree of warming increases water vapour by 7% and I've also learned that the atmosphere contains (on average) between 1-5% water vapour when saturated, this confused me a ...
6
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5answers
135 views

Does global warming inhibit transport of moisture?

This northern summer, 2021, there were wildfires in Southern Europe and floods in Germany nearly at same time, also, floods and wildfires in different parts of Turkey, and floods in Far East of Russia ...
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0answers
53 views

Meteorological Data API with Python

I have a number of points in Europe I would like meteorological data for. More specifically, I am looking for data that is relevant in Air Quality models, like wind, temperature and humidity. The time ...
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0answers
23 views

Using variables from different CMIP6 models

I would like to know if using variables (ex: sea surface temperature, precipitation, etc.) from two CMIP6 climate models to produce a species/niche distribution model is an accepted practice and won’t ...
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0answers
13 views

Does an increase in SR lead to an increase in strength and intensity of ionospheric lightning?

As explained in the following document: ELF Electromagnetic Waves from Lightning: The Schumann Resonances Upper-Atmosphere phenomena like Sprites and Elves can be recorded with extremely low frequency ...
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0answers
65 views

Calculating layer thickness in python

I have calculated the $∂θ_\varepsilon/∂z$ with 'Height', 'Latitude', 'Longitude' dimensions. ...
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0answers
58 views

Why is the air above the Himalayas warmer than surrounding areas?

Looking at earth.nullschool.net on 13.09.2021 you can see that the temperature above the Himalayas appear warmer than the surroundings (at 700 hPa): At the surface ...
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0answers
41 views

Range of frequencies of the Schumann resonance?

Crossposted at Physics SE As the surface-ionospheric gap acts as a resonator for electromagnetic waves, it should have several harmonic values from the base, fundamental frequency of 7.83 Hz. These ...
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3answers
106 views

Why isn't wind speed considered when calculating a heat index?

I work outside in Florida, and the heat is sometimes unbearable. But if a breeze hits me, it makes it much more tolerable. There are some days where there is high heat and humidity, and a steady wind. ...
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1answer
96 views

Is it possible for a local flood to reach the heights of a mountain, say 7000 ft, and wash away a ship over 350 miles? [closed]

Is it even possible? How much water would it take? Does the whole earth need to be flooded to reach that height?
5
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1answer
46 views

Why does the magnitude of the uncertainty on temperature forecast fluctuate periodically

I remember several years ago, the weather report on the VRT (Flemish national media) would show the temperature forecast of the coming days and it would also show the uncertainty on that temperature. ...
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0answers
28 views

Dynamic frontogenesis derivation

On page 142 of Lackmann's Midlatitude Synoptic Meteorology, Equation 6.7 gives the derivative of the Boussinesq buoyancy $b = \frac{g \theta'}{\theta_0 (z)}$ (perturbation potential temperature $\...

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