Geopotential Height and Precip Question



  • Hi Windy,

    I'm a fan of your plotting as a meteorologist/climatologist. Is there a reason when you click "Rain, Thunder" and animate precipitation, the isopleths do not animate? This is particularly of interest on the meteorology side since this is the only modern website I know of that plots ECMWF data at higher time resolutions compared to other sites. Speaking of ECMWF data, do you pay a large fee to plot their data?

    Thanks


  • Moderator

    @zacharyj7 The isobars do animate as the forecast moves forward in time. And as for the geopotential height, Windy doesn't have a layer or isopleths anymore since a few months ago. Not exactly sure of the reason, I know that geopotential height parameters are no longer supported on the site.

    And as for the ECMWF model, Windy does pay to use the model. That is why Windy is currently accepting donations to help pay for it.


  • Sailor

    @theradarguy
    Hi Guy, your answer to @zacharyj7 is strange for me.
    Windy does have isopleths for geopotential heights. (Isopleths is a general term similar to Isolines used in Windy menu. When speaking of geopotential heights, the precise term is Isohypses)
    There is no layer for geopotential heights, unfortunately.... but geopotential isolines are available if you select them in « More layers ». These geopotential isolines do animate with Temperature layer or Rain layer. However this works fine with ECMWF, but very bad with GFS !
    It would be a good improvement to make the GFS isohypses (or geopotential isolines) correctly displayed !


  • Moderator

    @idefix37 I have the option for geopotential heights isopleths too, but it doesn't work for me on any model. Whenever I click on it, it just gives me a "You are no longer connected to the internet error."


  • Sailor

    @theradarguy
    It seems that this issue is linked to the browser ??
    https://community.windy.com/topic/5577/display-isolines-does-not-switch-between-layers
    I use Safari and Chrome, but for both of them geopotential isolines work only with ECMWF.



  • Thank you @idefix37 and @TheRadarGuy for your informative answers.

    Also, one more question. On the interface, is there any indication which model run the data is using? Like shouldn't it say, "ECMWF 9km - 12z 01/22" for example (where it says "ECMWF 9km"), so we know which run the data output is showing? Perhaps I am missing this somewhere.

    As for the geopotential height data, are the isohypes arbitrary? Shouldn't they be every 60 meters as standardized (540, 546, 552 decameters for example, or 5400, 5460, 5520)? They appear random. Perhaps the code needs to be arbitrary for the user interface?

    Thanks again!


  • Sailor

    @zacharyj7
    The run time is displayed when you click on the clock

    13298AE8-1B53-4F09-BED5-F6427AB81A78.jpeg

    On this example the run time is 12:00 Z or 12:00 UTC

    Concerning the isohypses, they are expressed in meters, when usually they are in decameters. They are drawn by Windy from the model raw data and do not seem to be based on standardised values. Only developers may answer to this question.



  • @zacharyj7
    Windy draws isohypses every 26 m (at 850 hPa)
    and every 46 m (500 hPa and above).
    I don't know why developers chose that numbers.

    We meteorologists use the following contour intervals:
    30 meters for the 850 and 700 hPa charts,
    60 meters for the 500 hPa chart,
    and 120 meters for the 300, 250, and 200 hPa charts.

    I think @developers must use the aforementioned standards.


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