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    GFS pressure forecast on two different sites not matching

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    • Siony MarioS
      Siony Mario
      last edited by ivo

      0_1491717251664_image.jpeg

      What you see is Tropical Tidbits(left) and Windytv(right) pressure maps for a possible storm near the PH this week. I noticed that the pressure readings vary, but how did this happen? Appreciate any explanation!

      *pressure reading on the TT map is 951 hPa vs. Windytv's 995 hPa

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      • ivoI
        ivo Administrator
        last edited by

        Hmm strange. Can you please check, that refTime of both images are the same

        Siony MarioS 1 Reply Last reply Reply Quote 0
        • Siony MarioS
          Siony Mario @ivo
          last edited by Siony Mario

          @ivo checked the latest model run tonight (UTC +8:00 here in the Philippines), still varies.

          1 Reply Last reply Reply Quote 0
          • ivoI
            ivo Administrator
            last edited by

            Please check ECMWF model. Now I see big diff in ECMWF and GFS model

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            • Gkikas LGPZG
              Gkikas LGPZ Moderator
              last edited by

              Are we talking for Sunday 16 Apr?
              I see the same central pressure (994 hPa) both in ECMWF & GFS but in different location. ECMWF shows the center over land (Philippines), GFS keeps it on the sea. Next days we'll see what model predicted more accurately the trajectory.

              Siony MarioS 1 Reply Last reply Reply Quote 0
              • Siony MarioS
                Siony Mario @Gkikas LGPZ
                last edited by

                @meteo-GR yes....

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                • Gkikas LGPZG
                  Gkikas LGPZ Moderator
                  last edited by

                  @Siony-Mario The latest model's run almost disappears the Low over Philippines for Apr 16th. ECMWF shows it over Romblon isl. with central press. 1008 hPa (yesterday's run was 994) and GFS shows it over Catbalogan (1003 hPa). As I remember it was predicted as a small eddy coming from Southeast. It wasn't an well organized cyclonic system so it has a chaotic behaviour.

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                  • Gkikas LGPZG
                    Gkikas LGPZ Moderator
                    last edited by

                    Also take a look at
                    http://www.weatheronline.co.uk/cgi-bin/expertcharts?LANG=en&CONT=soas&MODELL=gfs&MODELLTYP=1&VAR=pslv&WMO=&ZOOM=0&RES=0&PERIOD=&PANEL=0&ARCHIV=0&BASE=201704090000%26HH%3D168
                    try different runs and you'll see totaly different forecasts for next Sunday.

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