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    500 mb height anomaly

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    • Alex HensonA
      Alex Henson | Premium
      last edited by

      Not something that is necessary but Tropical tidbits has a 500mb height anomaly which can be pretty useful in predicting upcoming weather trends. A similar effect can be done by using the wind layer at 500mb heights and geopot height but the one on tropical tidbits adds a nice coloration too, sending a link for reference.

      https://www.tropicaltidbits.com/analysis/models/?model=ecmwf®ion=us&pkg=z500a&runtime=2022090512&fh=12

      idefix37I 1 Reply Last reply Reply Quote 0
      • KorinaK
        Korina
        last edited by

        @Alex-Henson Hello, please check the related thread.

        Korina

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        • KorinaK Korina moved this topic from Your Feedback and Suggestions on
        • idefix37I
          idefix37 Sailor Moderator @Alex Henson
          last edited by idefix37

          @Alex-Henson
          @Korina

          Any parameter (temperature, wind, 500hPa height…) shown as ´anomaly’ is a comparison of the current forecast with the the normal value at same day or week or month. The normal value is the mean value over the 30 last years. It could be less than 30 years, but this climate reference is averaged on a long period of time.
          That would suppose that Windy store or get the data of the normal values of the considered parameter over all points of whole globe.
          https://www.ncei.noaa.gov/products/land-based-station/us-climate-normals
          The weather services of each country computes generally this normal data, but to get a whole and global picture of the normal data, this is done by reanalysing the past climate.
          ECWMF provides anomaly data using what they call climate models on a significant period of time.
          Example with SST
          https://apps.ecmwf.int/codes/grib/param-db/?id=171034
          For 500hPa heights it seems ECMWF only provides weekly anomaly:
          CA2A9AF8-DBB0-4A02-B717-46D5191518E9.jpeg

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