Home Forums Weather & Weather Stations RASP & Windgram Upgrades

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    Alan Crouse
    General Member

    Retirement (and the weather) have provided the opportunity to spend some quality time with the Windgrams and the underlying RASP model.  With a little help from the RASP community, a new version of both is nearing completion.

    The improvements:

    – Much newer version of the underlying wrf software; goes from wrf 2.1 to wrf 3.6.1;

    – Docker-based (though still running locally at the moment);

    – Revised input data, both newer and higher resolution (land-use, green-fraction, upper and lower soil type, and elevation data);

    – Revised Windgram software.

    The only loss from these upgrades will be the smaller, windowed models offered in the RASP viewer.  As far as I can tell these are rarely (never?) used as the RASP model seems to be primarily accessed for XC planning.

    The Windgrams change quite a bit with this update.  Here is an example from today’s Marshall diagram, along with an explanation (still showing the metric info).  Nothing has been changed yet, so consider this an opportunity to comment.

    Thank you,




    Meteograms Explained v20210223

    Jerome Daoust
    General Member
    CSS Instructor

    Thank you for working on this Alan !

    If your windgrams go metric, the US will follow.

    Alan Crouse
    General Member


    Relax, the explanation is still metric, but the Marshall sample shows data converted to units more familiar to our local pilots 🙂

    David Webb
    General Member

    Metric by force! We need to enter the modern age and start counting by tens 😀

    Alan Crouse
    General Member

    I ran today’s (2/24) as there is a truck running and it should be flyable.  There are some differences in the forecast:

    – New windgrams are more optimistic about the top of lift

    – New windgrams are more pessimistic about the wind direction and forecast stronger winds later in the day.  N_SCAL_Marshall_windgramN_SCAL_Marshall_windgram_new

    David Webb
    General Member

    Alan – looks like we have a very-scientific sample size of 3 over here, in addition to the Marshall weather station data from yesterday. Perhaps we can build up several of these comparisons to see which one holds up better for this location.

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