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    Isotherm 0°C

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    • Yves70
      Yves70 Meteorologist | Premium last edited by Yves70

      By checking the isotherm 0°C map, I discovered something that I didn’t notice so far.

      It seems that IFS takes into account the altitude of the location which is not the case of ICON-EU. Look the two following screenshots for the same location which is roughly at 500m, at the same moment :

      ISO 0°C with ECMWF (IFS)
      0FC1167A-657E-4DEF-B9EF-932EC600955F.jpeg

      ISO 0°C with ICON-EU
      45F867CC-D464-4E0E-91DA-461C4BE8F9E3.jpeg

      As you can easily see, the delta between the 2 values is 500m so the exact altitude of the location. If you choose other locations, you will see the same behaviour. There is always a delta fitting more or less with the altitude of the location, and not because the models are giving two different values,...

      This means that the data of the 2 maps are not coming from the same calculation. IFS is given the altitude of the isotherm 0°C using the location as a reference so here 200m above Hockai (200+500=700m) while ICON-EU seems to give the altitude of the isotherm with the sea level as a reference.

      Gkikas LGPZ 1 Reply Last reply Reply Quote 1
      • Gkikas LGPZ
        Gkikas LGPZ Moderator @Yves70 last edited by

        @yves70
        https://community.windy.com/topic/3643/clouds-bases/10?_=1617623036119

        Yves70 1 Reply Last reply Reply Quote 2
        • Yves70
          Yves70 Meteorologist @Gkikas LGPZ | Premium last edited by

          @gkikas-lgpz
          Thanks for the reference to the old post. I did a search but didn’t find it

          1 Reply Last reply Reply Quote 1
          • TZ
            TZ Administrator last edited by

            Hi, thank you for reminding this, I am putting the issue on the "top of our stack".

            1 Reply Last reply Reply Quote 3
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