21 votes

What is this Sun and moon photographic anomaly?

The apparent anomaly, known as the Lunar Terminator or Moon Tilt Illusion, is indeed a matter of perspective. A brief explanation can be found here: http://chrisjones.id.au/MoonIllusion/ The essence: ...
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  • 211
13 votes
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Plotting wind barbs in python

Your uwnd variable holds 32 bit floats and has shape (1,73,144) corresponding to time, lat, lon and is located in the Dataset ...
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  • 13.9k
12 votes
Accepted

What is the formula used for atmospheric visibility?

I calculate surface visibility from WRF output using a calculation that I adapted from DTC's Unified Post Processor, specifically from their Fortran routine found in ...
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  • 4,925
10 votes
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Plotting ERA5 U/V Wind Data Using Python

First off very few people are using Basemap from Matplotlib these days. From this link matplot basemap Basemap is deprecated in favor of the Cartopy project. See notes in Cartopy, New Management, ...
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  • 6,267
7 votes

What is this Sun and moon photographic anomaly?

Here my wife holds a globe with the moon in view. I carefully processed in a bit-mode to find the curve of light on the globe and drew perpendicular lines. Plainly we can see that the moon-lite side ...
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7 votes
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What kind of data is best shown in a rose diagram?

Rose diagrams, also called polar bar plots, are useful for showing azimuthal (directional) data. Any dataset consisting of lots of measurements of direction or orientation could be visualized this way....
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  • 10.7k
6 votes

Plotting the wind direction in 3D?

The context I often see the u,v,w components shown in one plot are forward and backward trajectory plots like those from the NOAA HYSPLIT Model, which provides separate panels for horizontal and ...
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  • 12.7k
5 votes

Why is there a logarithmic grid on this plot?

It's a mistake. You probably know this, but for anyone who's interested, these wireline logs are: DRHO — density ('RHO') correction (delta, or 'D') in g/cc. DPHI — porosity ('PHI') from density ('D')...
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  • 10.7k
5 votes

Plotting the wind direction in 3D?

Try quiver3 function in Matlab. For example, this is the example in Matlab's website for this function:
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  • 161
5 votes

Is there a publicly accessible resource of video/image footage of the sky over an entire year?

It may be more than you want, and more terrain-focused, but UC San Diego's High Performance Wireless Research and Education Network (HPWREN) has an archive for each of dozens of fixed-angle Southern ...
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  • 2,802
5 votes
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Rainbow dynamics?

Short answer: the refraction of light is ultimately dependent on both temperature and exact composition of the medium (e.g., liquid water or ice) through which it passes. Note: strictly speaking, "...
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  • 1,104
4 votes

What is this Sun and moon photographic anomaly?

You can see this effect on the powerline above the railroad tracks in the picture you posted too, it doesn't look straight, even though it likely was in reality! The straight line between the sun and ...
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  • 1,959
4 votes

How to plot lat-lon-rainfall in MATLAB?

There are two stages to what you want here. 1. Converting point data to gridded data First off, since you want to plot regular cells rather than the actual data that you have, you need to covert ...
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4 votes

How to plot lat-lon-rainfall in MATLAB?

What kind of plot do you want? Lat = [25.5 26.5 33.5 34.5 35.5 36.5 41.5 42.5]; Lon = [89.5 91.5 78.5 79.5 83.5 84.5 75.5 76.5]; Rain = [110 120 122 135 114 116 145 120 110 110]; ...
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  • 6,356
4 votes
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How would the Earth look without water in the oceans?

National Geographic made a documentary called Drain the Ocean, this is You Tube link to part one. the other three parts are there as well.
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  • 20.4k
3 votes

Websites providing visual weather data

For forecasting, there is a ton of data on the internet. Here are just a few sources. A Penn State professor compiled a list of weather websites on a webpage called National Weather Connections. I'd ...
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3 votes

Websites providing visual weather data

weather.us If somebody is looking for free global ECMWF forecasts the above site provides a fairly complete set of links that provide information 10 days into the future. You can track the control ...
2 votes

Plotting the wind direction in 3D?

Try Mayavi - Mayavi 3D Python plotting. You can supply the u,v,w components of the wind vector as input and plot a 3D diagram
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  • 6,267
2 votes
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How can I implement a visualization of archived convective data from numerical weather models?

The best model archive I know of offhand is Iowa State Meteorology's Gempak model data in their MTArchive. Looks like model-wise, they have at least 10 years of GFS (and the predecessor, the AVN). ...
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2 votes

How to plot a Hovmoller diagram in MATLAB?

Here is an example using contourf. The trick is in sampling the 3D arrays appropriately: ...
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  • 14.7k
2 votes

What is this Sun and moon photographic anomaly?

When looking at the sky, spherical coordinates are used as a convenience. We turn our head and body in azimuth and altitude to compare the position of objects. In this regards, the sky looks like a ...
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  • 196
1 vote

Looking for fun and illuminating weather visualizations

Try VentuSky. An interactive map with different models and data visualization that can be adjusted easily.
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  • 1,043
1 vote
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Looking for fun and illuminating weather visualizations

Try Windy.com It looks very similar to the EarthWindMap, but appears to offer more controls. It is simple to change the heights and what variables are of interest.
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  • 12.7k
1 vote

Websites providing visual weather data

VentuSky: Uses ICON, GFS, GEM (global) and HRRR (US) models with respective forecast times 4, 9, 9 and 2 days respectively. Map can be played as animation. Animation and weather map settings can be ...
1 vote

Plotting the wind direction in 3D?

How about using the same 2D wind rose plot for an additional figure, but color it with respect to velocity in the vertical? So you will have two of the similar looking wind rose plots, they will both ...
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  • 562
1 vote

What kind of data is best shown in a rose diagram?

In seismic acquisition and processing rose plots are essential. Another way to think of these plots is "angular histograms." This article article shows rose plots for a subsurface point using this ...
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