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I need to filter out the low speed winds from the values inside a Grib file. This is my first time using this kind of data. I can read the file, and iterate inside all the GeoSpatialValues (getting lat, long and value from these).

To get the maximum resolution, should I use any specific list of the so called "component of wind" ?

Is there an easy way to calculate the speed from these values or should I iterate in the U values and then V values of wind to finally combine them into a vector?

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  • NOAA

    If you are getting your data from the NOAA's Global Forecasting System (GFS), there's a GRIB message called GUST which is the surface wind gust expressed in m/s, but does not provide a computed speed U . V . cos(Θ) . You'll have to grep :GUST: in the GFS .idx file. File download location for GFS.

    The WAVE model, though incomplete, provides WIND, which is the computed wind speed File Download Location for WAVE model.

  • ECMWF

    ECMWF also provides a computed speed GRIB, named WS through their "essential dataset". They don't use inventory file like NOAA so you'll have to download the grid directly from their ftp.

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