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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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64 views

Where did clouds obscure the American eclipse of August 2017?

Emphasis here is did. I'm trying to find a source that will inform me about which locations in the United States actually had their view of the eclipse on Aug 21, 2017 obscured by clouds. I'd ...
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551 views

What are the Theoretical Limits for Tornado Size and Strength

Is there a theoretical physical limit that we can calculate with regards to Tornado formation? At what size and strength is a hypothetical tornado physically impossible. The largest tornado in ...
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947 views

Moisture flux convergence in GrADS

I want to calculate vertically integrated moisture flux convergence (VIMFC) in GrADS. But when I give the following instruction it marks me errors: ...
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61 views

Equation for Atmospheric Pressure Tide

Using Pressure sensors - I found out that there is a daily pressure wave-like pattern with peaks at 9:00 & 21:00 (local time). I want to construct an equation to explain this phenomena, probably ...
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136 views

How are global cloud cover estimates generated and how is the data accessed?

The website ventusky.com offers three models to produce cloud estimate: ICON, GFS and GEM. They extract a fractional cloud number, shown in percentage. From the ERDDAP portal to the GFS model (...
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70 views

Will the next ENSO event be of modoki type?

Where can I find free information to learn if the forecasted ENSO El Nino event for 2nd semester 2017 will be a MODOKI one? The Japan Meteo Service also publishes the EL-NINO-MODOKI Index (below), ...
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135 views

Heating degree days forecast

I am trying to find heating degree days forecast data for a certain state for a long period ( > 3 mons) published by the US government or universities. What I found: Heating Degree Days W. N. ...
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351 views

Learn weather forecast

Is there any website for videos/articles that explains how to read maps or other graphics use to make forecast prediction (more advanced than the weather channel please) ? It could be about any ...
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38 views

Does the hour of the day and the position on the sun have any influences on the formation of a hurricane?

I am writing an essay and cannot find if a hurricane is influenced by the position of the sun or the hour of the day.
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238 views

How does the interaction between Subtropical Westerly Jet Stream and Himalayas causes subsidence of air?

While reading the topic "Monsoon" in Aguado's Understanding Weather and Climate, I read this line During winters... Air flows down the southern slope of the Himalayan Mountains due to more rapid ...
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178 views

Difference between convergent precipitation and cyclone precipitation?

What exactly is the difference between convergent precipitation and cyclone precipitation, their generation and characteristics?
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133 views

Downscaling global meteorology data

Can some one explain me the basics of downscaling (interpolate to a smaller cell) a global meteorology data to a local scale (2 km × 2 km). IF would be very thankful if you provide a link at least. is ...
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86 views

Is the number of high/low pressure regions different at low pressure levels at high pressure levels?

Is there a higher number of mid-latitude high/low pressure regions at 850 mb, as compared to the number of high/low pressure regions at 200 mb? And if so, why?
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40 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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37 views

Hypothetical: an immense disc blocks sunlight, how does this affect the weather?

I have a hypothetical situation, and I am specifically interested in how this situation would affect the weather. I have asked this question elsewhere, however I feel that nobody with any expertise ...
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38 views

Why did Hurricane Harvey have so much lightning associated with it?

Hurricane Harvey was a prodigious lightning producer when it hit Houston/SE Texas. But I thought hurricanes don't have much lightning (with the eyewall being the only exception), due to tropical ...
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40 views

Application of vorticity tendency equation

I have a question about the dynamics of westward propagating vortices. In meteorology, the vorticity tendency is often used to explain the westward propagation of vortices (cyclonic circulation). A ...
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42 views

Are there more meteorological catastrophic events due to climate change?

I was told by a sedimentologist there is no evidence of more climatic catastrophic events at the geological register previous to Pleistocene, when climate was warmer. My question is if meteorologists ...
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81 views

Characteristics of saddle points in stream line charts

I am trying to locate saddle points or commonly known as "col" in synoptic meteorology. This is "z" in the following figure. References Here are some of the references regarding this. a). http://www....
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1answer
86 views

Computation of geostrophic wind

I am attempting to calculate the zonal and meridional components of geostrophic wind using the equations below: $u_g = -\frac{g_0}{f} \cdot \frac{1}{r} \cdot \frac{\partial \Phi }{\partial \phi}$ $...
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42 views

Any appreciable differences in microclimate on the shores of small mountain streams?

I have land in India (the tropics), in the hills, on a slope from 6800 feet - 5200 ft altitude (roughly). At that lowest point there's a stream of about 10-15m across. On one side is our land, on the ...
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112 views

How to plot orography for vertical profile of a certain variable along pressure levels in GRADS

I am using GRADS (1, 2, 3) to plot ERA reanalysis relative humidity profile for latitudinal average of 15N to 37N, and along the longitude from 40E to 130E. The orography is quite obvious and thus ...
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52 views

What causes frozen “shooting water” spikes from ice covered water in the winter?

I have seen things like this appear once or twice on cold winter mornings, a frozen spike of water from an ice-covered container or very small body of water (puddle). I found the photo below at Mel ...
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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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34 views

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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50 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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52 views

Tower cumulus clouds without lightnings

Is there any possibility to have tower cumulus (or cumulonimbus in worst case) without lightnings? And if this is happen what is the factor that cause this phenomenon?
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62 views

Snow under Siberian High

The Siberian High is a very strong anticyclone present over Siberia in the winter. Cities like Irkutsk lie at its very center, yet Irkutsk has 18-20 days of snow per month in the winter. Shouldn't we ...
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44 views

How to divide timeseries into normal periods in meteorology and climatology?

When analyzing hydrological and climatological timeseries/observations it is a common practice to compare statistics made on normal periods. As WMO calls them: "WMO Climatological Normals". These ...
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32 views

Why is wind sporadic in a Boston northeaster?

We are having a tough little northeaster in Boston, USA, right now and one oddity that I notice is the wind pattern. There will be complete calm for 3-5 minutes, then the wind will blow hard in gusts ...
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92 views

Why do nearby thunderstorms move in different directions?

The image below from the Australian Bureau of Meteorology shows several thunderstorms in southeast Queensland today and the directions they are expected to move. I'm surprised how different these ...
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985 views

Is this an accurate simulation of a further south Australia with a filled lake Eyre?

I created this climate map based on a simplified Koppen Climate Classification map (shown below). In this scenario Australia is moved 10 degrees of latitude further south and the Lake Eyre basin is ...
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489 views

Interpolation and extrapolation of unstructured data in python: memory error

I have 3 arrays, for longitude, latitude and temperature (so the observations are scattered in space). I want to apply interpolation on these data, but also extrapolation. I 've written the code beow, ...
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46 views

What is the minimum area needed to create a functional weather system?

Beyond creating a closed ecological system - that focuses on providing a balanced homeostatic environment - what is the smallest area that could create actual weather events? If we wanted to engineer ...
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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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311 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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81 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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48 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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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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130 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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25 views

Is there any program that gives you air temperature (and precipitation) information if you feed them the date and location (latitude,longitude)?

I know I can google each data point (latitude, longitude, date) one by one and find if the government of that country has archived past weather information. But this will take infinite amount of time ...
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35 views

Question about the physics of hurricanes

I've a basic misunderstanding about the formation of tropic cyclones. From the absolute point of view, cyclones form in order to conserve total angular momentum - air masses at different latitudes ...
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1answer
63 views

What is the most optimal latitude on Earth for the generation of extreme maximum temperatures?

First question on this StackExchange, so here goes... Overall, reaching high temperatures is dependent on 2 factors: The (maximum) solar angle in the day. The greater the solar angle, the more ...
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1answer
35 views

Historical isobaric charts?

I am looking for a small-scale isobaric chart, which encompasses central Africa. I am interested in the time span of the past few months. Do you know where to find it? Thanks
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48 views

Thermal likelihood formula

Background: I use the X-Plane flightsimulator for flying and gliding. In the program we have real weather (clouds, winds, etc...) but thermals are not well implemented, they don't have any connection ...
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93 views

Does this weather pattern have a name?

The past few weeks of spring in northern Ohio I believe I have noticed a weather pattern where the weather forecast will show a string of days with rain, but what happens is the day is mostly clear, ...
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144 views

Modification of an air mass

If an air mass that exists in North America starts moving south west or south east what kind of modification will affect it and how would you characterize it in it's final state? My answer is that it ...
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36 views

Topography and flash flooding

I'm looking for a study or document showing the effect of the topography, slopes, the sea level and the tide on flash flooding occurrence. Thanks in advance
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49 views

Figuring out the temperature at the tropopause

Either I am misunderstanding something, or reading conflicting information. Likely the former. First off, the tropopause is defined as the boundary between the troposphere and the stratosphere. That ...
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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 ...