title: Convert grib2 files to csv
body: <p>I am working on a classification problem with grib2 files. I have been trying <code>Xarray, pynio, pygrib</code> to read these data but couldn't solve it yet. Can anybody explain what is the structure of grib2 files? How they are created? Is there any quick way to convert them into <code>csv</code>?</p>