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    UNSOLVED Upper air temperatures

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    • Gkikas LGPZ
      Gkikas LGPZ Moderator last edited by

      Upper air temp. on the map is not the same as on sounding.

      Temp. at 250 hPa (FL340) is -56C (confirmed by official prognostic chart).
      Sounding shows temp. at FL340 is -59C.(wrong).
      f6d0ff14-9f9d-41b0-9e01-f88cf510f096-εικόνα.png
      The cause is that sounding uses interpolated values from 300 hPa and 200 hPa.
      for better results you must, also, take into account values at 250 hPa (its a standard level).

      Also, keep in mind that tropopause usually lies at these levels
      so you cannot interpolate temperatures as tropopause is a discontinuity surface.

      Gkikas LGPZ idefix37 TZ 3 Replies Last reply Reply Quote 2
      • Gkikas LGPZ
        Gkikas LGPZ Moderator @Gkikas LGPZ last edited by

        .... official chart confirms that temperature at FL340 over NW Greece is -56C
        50894d20-af4b-4333-bc2d-d5327c637403-εικόνα.png

        1 Reply Last reply Reply Quote 0
        • idefix37
          idefix37 Sailor Moderator @Gkikas LGPZ last edited by idefix37

          @Gkikas-LGPZ
          I thought that the blue curve (and blue figure) was the dew point and the red curve the temperature shown by the dry thermometer. But may be I’m wrong, being not familiar with atmosphere soundings.

          Gkikas LGPZ 1 Reply Last reply Reply Quote 0
          • Gkikas LGPZ
            Gkikas LGPZ Moderator @idefix37 last edited by Gkikas LGPZ

            @idefix37
            Yes! You're right. Red curve and numbers stand for temperature.
            But, the problem I mentioned still exists!
            (confirmed temp. at 250 hPa = -56C. Sounding temp. -53C).

            Gkikas LGPZ 1 Reply Last reply Reply Quote 0
            • Gkikas LGPZ
              Gkikas LGPZ Moderator @Gkikas LGPZ last edited by

              ... the straight line from (A) to (B) shows that no other level (from 300 hPa to 200 hPa) is taken into account.
              b5f305c5-1ff6-4709-9858-a592a105d547-εικόνα.png

              1 Reply Last reply Reply Quote 1
              • TZ
                TZ Administrator @Gkikas LGPZ last edited by

                @Gkikas-LGPZ Thank you for investigation. Yes, it seems that the 250hPa layer is missing in sounding. I will look at it.

                Gkikas LGPZ 2 Replies Last reply Reply Quote 1
                • Gkikas LGPZ
                  Gkikas LGPZ Moderator @TZ last edited by

                  @TZ
                  any progress ?

                  TZ 1 Reply Last reply Reply Quote 0
                  • TZ
                    TZ Administrator @Gkikas LGPZ last edited by

                    @Gkikas-LGPZ Hi, I appologize for the delay. My colleague is now working on another upper air task, so he also will add the 250h layer for sounding. If everything goes well, it should be done during this week.

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

                      @TZ
                      Thank you.
                      I'm very glad to see that Windy provides such "professional" tools (like sounding).

                      TZ 1 Reply Last reply Reply Quote 0
                      • TZ
                        TZ Administrator @Gkikas LGPZ last edited by

                        @Gkikas-LGPZ And I am happy that you find it useful. I have a list of improvements for the sounding graph, but unfortunately it has small priority now.

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

                          @TZ
                          It is fully understandable!

                          1 Reply Last reply Reply Quote 0
                          • Gkikas LGPZ
                            Gkikas LGPZ Moderator @TZ last edited by

                            @TZ said in Upper air temperatures:

                            the 250hPa layer is missing in sounding

                            I think you solved this problem! 250 hPa data in sounding are not missing anymore!
                            Thank you!
                            64500c2e-c207-4c5c-8330-cfc2ec61716f-εικόνα.png

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

                              Ohh ! not again!
                              2c6622d3-cad3-4456-9ea6-84e18b774f69-εικόνα.png

                              1 Reply Last reply Reply Quote 0
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