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    Is model resolution important?

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    • TZ
      TZ Administrator last edited by TomSlavkovsky

      Yes, it is very important. Some local phenomena cannot be forecasted by the coarse model.

      Following pictures show differences between ECMWF and GFS forecasts for Canarian islands.

      Wind pattern is affected by the shape of the mountains. This effect is not caught by the coarse model.

      Similar problems occur in forecasts of convective storms or disputed maximum wind velocity in hurricanes.

      ECMWF model (approx 9km resolution)

      _center

      GFS model (approx 22km resolution)

      _center

      capt.Amory 1 Reply Last reply Reply Quote 4
      • ivo
        ivo Administrator last edited by

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        • TZ
          TZ Administrator @ivo last edited by

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          • capt.Amory
            capt.Amory @TZ | Premium last edited by

            @TZ that Makes sense. But is the GFS model 22km higher resolution is better/more occurate than lower European ECMWF 9km resolution model?

            idefix37 1 Reply Last reply Reply Quote 0
            • idefix37
              idefix37 Sailor Moderator @capt.Amory last edited by idefix37

              @capt-Amory
              No, GFS 22km has a lower resolution than ECMWF 9km which has a higher resolution.
              https://help.weatherflow.com/hc/en-us/articles/207913278-Weather-model-resolution
              The resolution is the number of grid points on a given surface (or pixels on a digital photo). If you decrease the distance between the points, you increase their number and so the resolution.

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