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  • Moderator

    @korina
    Please add explanation for the shadows of gray.
    I think represent relative humidity aloft (not clouds). Isn't it?


  • Thanks for the descrition. I have a question about the gray shades (relative humidity?) on the bottom of the meteogram. It appears that there are 7 shades of gray. How do the shades of gray and the relative humidity correspond (Whitch shade of gray represents what level of humidity)?
    Thanks.

  • Meteorologist | Premium

    @hgk209
    First of all, we should get the confirmation about the exact meaning of the shades of grey. Is it humidity level or cloud cover ? High level of humidity doesn’t necessary mean clouds

    @Korina
    @ivo
    Could you let us know ? Thanks

  • Sailor Moderator

    Please find additional information about Meteogram and cloudiness:

    https://community.windy.com/topic/10309/cloudbase-meteograms?_=1608981618271

  • Meteorologist | Premium

    @idefix37
    Thanks, this is clear now. Grey shades in the meteogram are linked to relative humidity, not cloud cover

  • Meteorologist | Premium

    Having said that, relative humidity is a great tool to better understand, very quickly, the situation and even if you cannot completely linked cloud cover and relative humidity, they are both linked in a way.
    Cloud maps are still necessary to assess the real cloud cover, knowing that in any case, those cloud maps are not super accurate,...
    Sounding can complete the analysis


  • thanks for sharing..


  • That's a very helpful guide for a beginner like me with the app. Now some noob questions -
    a. I didn't quite get the Shaded area description
    b. how do I check that there's only high clouds at a site and say in the direction of sun no low/middle clouds
    c. how do I check for cloud inversion from a hilltop in a valley. sometimes its also referred as low clouds / fogs but following that had me stuck in thick fog on hills

    thanks so much in advance.

    kind regards

  • Sailor Moderator

    @crazycats
    Hi,
    a. Which shaded area are you referring? In Meteogram the explanation is given in posts here above.
    b. Check High, Medium and Low clouds layers. If necessary see More layers... The direction of the sun is given by a plugin only available on website. Menu > Install plugins > Sun position
    c. You probably mean in case of temperature inversion, which brings a cloud / fog layer below the inversion. You can check that by using the Sounding feature. Right click on mouse.

    Capture d’écran 2021-01-09 à 09.08.37.png

    • Temperature inversion when the temperature (red curve) is increasing with altitude instead of decreasing.
    • Clouds when temperature and dew point are close together (red and blue curves)

    Note that the weather model can only show this phenomenon at large scale but not in local conditions like in a mountain valley.

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