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    A difference between reference time and update time

    Frequently Asked Questions
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    • Korina
      Korina Administrator last edited by Korina

      Each model has a different update time and it could be confusing what connection does it have with the update time.

      Here is the explanation:

      • Reference time - is the time when a model starts a new forecast block.

      It consists of:

      Initialisation - data are entered into the model, this creates Initial conditions (initialisation time) and then model starts calculating conditions.
      Assimilation - normalisation on data and assembling data for computation.
      Computation - calculating the future atmospheric rates of change in time increments.
      Data extraction - extracting data into regular forecast intervals.
      Data storage - data are stored and written in accessible format.
      Data postprocessing - special postprocessing routines

      For example model ECMWF has an update interval 12 hours (or 6 hours interval for Premium users), that means the first reference time will be 00:00:00Z (Zulu time) and second one 12:00:00Z.

      • Update time is time between the reference time and the actual update.
        The whole process of data computation takes approximately from 8 to 9 hours.

      So for ECMWF model the update times are 07:15:00Z and 19:15:00Z.
      See the exact update times here - When and how often are the weather data updated?.

      Where to find info about reference and update time:


      Desktop


      _center_shadow2edb858c-e546-4540-9c35-7cc54393c1b8-image.png

      App


      _center_shadow052e72d1-7083-468c-916b-97e5ea4e99d1-image.png

      chrismcdonald 1 Reply Last reply Reply Quote 7
      • H
        Homer1959 last edited by

        Thanks Korina, a lot easier to understand now :-)

        1 Reply Last reply Reply Quote 0
        • matijamet
          matijamet last edited by

          Hi, Korina!

          But, then it is something wrong by NEMS! When I look on it, comparing models, I see big time difference between reference and update data!(?)

          1 Reply Last reply Reply Quote 0
          • Korina
            Korina Administrator last edited by

            @matijamet
            Hello, please see this post about update times - https://community.windy.com/topic/3340/when-and-how-often-are-the-weather-data-updated. There is nothing wrong with NEMS model.

            matijamet 1 Reply Last reply Reply Quote 1
            • matijamet
              matijamet @Korina last edited by

              @Korina ,

              if you look on the "reference time" for NEMS, for example hier, https://www.windy.com/multimodel/44.107/15.326?44.108,14.248,8
              you'll see for METEOBLUE (NEMS) :

              Updated: 2020-02-27T07:27:42000Z
              Reference time: 2020-02-25

              Or, I don't understand something?

              Thanks!

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

                @matijamet
                @Korina
                check
                3df9c68f-cee6-415e-a959-43eeaf25890a-εικόνα.png

                matijamet 1 Reply Last reply Reply Quote 4
                • matijamet
                  matijamet @Gkikas LGPZ last edited by

                  @Gkikas-LGPZ

                  Thanks! All is clear now! I supposed the forecast was fresh, the mistake was only in one place, concerning reference time...

                  1 Reply Last reply Reply Quote 2
                  • Korina
                    Korina Administrator last edited by Korina

                    @Gkikas-LGPZ @matijamet
                    Hello, we use Meteoblue multimodel in the compare feature, which captures the whole world. So the reference time is different for this one. For Europe we use NEMS model by Meteoblue and the reference time is not the same as for the multimodel.
                    It was not a bug after all.

                    Gkikas LGPZ Md Eyasin Ali 2 Replies Last reply Reply Quote 3
                    • Gkikas LGPZ
                      Gkikas LGPZ Moderator @Korina last edited by

                      @Korina
                      One picture says more than 1000 words!

                      1 Reply Last reply Reply Quote 0
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                                        • Mark_Marsh
                                          Mark_Marsh last edited by

                                          Thanks, for share this article

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