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    NAM model

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    • ahorvath1A
      ahorvath1 | Premium
      last edited by

      Curious as to why your NAM model forecast is so different from the one shown for my area on SPOT. I am at Gun Lake in the South Chilcotin mtn’s by Goldbridge BC in Canada 50.86917 Lat, -122.87671 Long

      SutyS 1 Reply Last reply Reply Quote 0
      • SutyS
        Suty Administrator @ahorvath1
        last edited by

        @ahorvath1 Could you please provide link, so we can compare the situation?

        ahorvath1A 1 Reply Last reply Reply Quote 0
        • ahorvath1A
          ahorvath1 @Suty | Premium
          last edited by

          @Suty The link is spotwx.com
          I have noticed that quite frequently when it is raining at my location, the NAM model on Spot has shown it in the forecast, but the NAM model on Windy has not called for rainfall.

          Filip_KF 1 Reply Last reply Reply Quote 0
          • Filip_KF
            Filip_K Developers @ahorvath1
            last edited by

            Hi @ahorvath1,
            looks like spotwx.com uses different NAM model with 12km resolution:
            Screenshot_20241002_145856.png
            Windy uses NAM with 5km resolution:
            Screenshot_20241002_150243.png

            Both of them are listed here.

            1 Reply Last reply Reply Quote 1
            • ahorvath1A
              ahorvath1 | Premium
              last edited by

              Strange, I would have thought that the 5 K resolution would be more accurate than the 12k rather than less accurate.

              Filip_KF 1 Reply Last reply Reply Quote 0
              • Filip_KF
                Filip_K Developers @ahorvath1
                last edited by

                @ahorvath1
                Well, yes and no. Since lower resolution model is more smoothed out, it is more likely to predict rain in Your exact spot, if the rain is "somewhere" nearby.

                It is known as double penalty issue and You can read a bit more about it here.

                ahorvath1A 1 Reply Last reply Reply Quote 2
                • ahorvath1A
                  ahorvath1 @Filip_K | Premium
                  last edited by

                  @Filip_K Thanks for the explanation

                  1 Reply Last reply Reply Quote 1
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