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    How to read Meteogram

    Frequently Asked Questions
    meteogram
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    • idefix37I
      idefix37 Sailor Moderator @fhamilton36
      last edited by idefix37

      @fhamilton36
      No Windy does not provide historical data.
      Better to use the Pilot Charts than verifying days after days what was the weather during the last 10 or 20 years:
      https://community.windy.com/topic/9788/historical-wind-data?_=1619461576536

      dorucalinciobanuD 1 Reply Last reply Reply Quote 2
      • dorucalinciobanuD
        dorucalinciobanu @idefix37
        last edited by dorucalinciobanu

        Hello!
        If there is rain in the Meteogram at 4AM, does it mean it will rain from 1AM to 4AM, from 2:30AM to 5:30AM or from 4AM to 7AM? Thank You!

        1 Reply Last reply Reply Quote 2
        • vsinceacV
          vsinceac | Premium
          last edited by vsinceac

          fc644c48-fb4a-4326-a2b3-9226839e0434-image.png

          ¯\_(ツ)_/¯

          dorucalinciobanuD 1 Reply Last reply Reply Quote 4
          • dorucalinciobanuD
            dorucalinciobanu @vsinceac
            last edited by

            @vsinceac Thank You!

            1 Reply Last reply Reply Quote 1
            • G
              GreatKingnan
              last edited by GreatKingnan

              Hi, I've just found that the values of the 'last 3 hours' precipitation are different in the Meteogram and the layer data. For example, in this picture (https://imgur.com/k0uKcEq), the value derived from the weather picker is 71mm, but the value from the basic Meteogram on the same point is 92mm, which one is correct? Is it resulted from the different definition of the two rainfall value?

              Another question is, the value of 'Rain' in Meteogram is 78mm, and the convective rainfall is 14mm. And the sum of them is equal to the value in the basic meteogram, 92mm. So the 'blue Rain' term is actually the 'large-scaled precipitation?' and the value 92mm is the total precipitation, the sum of large-scaled and convective precipitation, right?

              Thank you!

              123

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

                @greatkingnan Hello, the values are different since they are calculated differently. The Rain, Thunder layer shows accumulation in the last 3 hour.

                Korina

                G 1 Reply Last reply Reply Quote 2
                • G
                  GreatKingnan @Korina
                  last edited by

                  @korina Thanks! So the value in Meteogram is the precipitation accumulated over a quite different time period compared to the Rain & Thunder layer? What's the time period you'd applied to do the calculation?

                  And I'd like to know whether the value of 'rain' in Meteogram & Airgram represents the large-scale precipitation or not? According to the description of parameter on ECMWF's website, total precipitation is the sum of large-scale & convective precipitation. It seems that the total amount of precipitation has been split into two parts in the bar graph in Meteogram: the large-scale term and convective term. Furthermore, the sum of 'Rain' and 'Covective' is exact the value in basic list, which might indicates the total precipitation. As a result, the term 'Rain' might be interpreted as the large-scale precipitation part in Meteogram.

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

                    @greatkingnan Hello, the Rain, Thunder layers shows data for last 3 hours. The detailed forecast shows data calculated for 3hr or 1hr depending if you are Premium user or not. Therefore those values cannot be the same.

                    Korina

                    G 1 Reply Last reply Reply Quote 0
                    • G
                      GreatKingnan @Korina
                      last edited by

                      @korina Thanks for your help! Yes, I know exactly the data in Premium version and free version are different. But...Actually, I'm trying to figure out the differences between the rainfall values shown on the 'Rain & Thunder' layers and basic weather forecast on the same place. I just found they aren't exact the same value, especially for heavier rainfall cases, so I have no idea which one is correct. I guess it might be caused by the different definition of accumulated time period or the interpolation between each grid point.

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

                        @greatkingnan Hello, detailed forecast or Rain, Thunder layer shows different data based on different calculations. Detailed forecast is more precise if you want to check the predicted amount of precipitation.

                        Korina

                        1 Reply Last reply Reply Quote 0
                        • C
                          chobi-chan
                          last edited by

                          Thanks, Korena for your very easy to understand description♪
                          Meteogram on Windy.com is my favourite weather forecast❤

                          1 Reply Last reply Reply Quote 0
                          • J
                            jev12b
                            last edited by

                            What is the arrow on my location pointing towards? As I turn to face a different direction, the arrow swings to point toward something else. It's not making any sense to me; what is its purpose?

                            idefix37I 1 Reply Last reply Reply Quote 0
                            • idefix37I
                              idefix37 Sailor Moderator @jev12b
                              last edited by idefix37

                              @jev12b

                              This arrow appears at your GPS position on the Radar layer and shows a fixed or inconsistent direction. It has no use.

                              63E2F732-9E42-459B-9A5B-DCC3223F4926.jpeg

                              1 Reply Last reply Reply Quote 0
                              • F
                                fran_j
                                last edited by

                                Hi,
                                I wanted to know what criteria you use for the elaboration of the meteograms. this is the one from the ECMWF.

                                https://confluence.ecmwf.int/display/FUG/Selection+of+grid+points+for+Meteograms

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

                                  @fran_j Please have a look at https://community.windy.com/topic/10309/cloudbase-meteograms?_=1630065415375

                                  Korina

                                  1 Reply Last reply Reply Quote 0
                                  • N
                                    natural lamp
                                    last edited by

                                    Very good summary, very helpful to the net friend ~

                                    1 Reply Last reply Reply Quote 1
                                    • Mark MansfieldM
                                      Mark Mansfield | Premium
                                      last edited by

                                      On the Meteogram, what does the letter 'K: at the cloud base mean ? I have it set to show it on feet, but soem shows for example 17K

                                      J 1 Reply Last reply Reply Quote 0
                                      • J
                                        jp_windy65535 @Mark Mansfield
                                        last edited by

                                        @mark-mansfield I think it means thousands (of feet) altitude.I think

                                        Mark MansfieldM 1 Reply Last reply Reply Quote 1
                                        • Mark MansfieldM
                                          Mark Mansfield @jp_windy65535 | Premium
                                          last edited by

                                          @jp_windy65535 thank you, that does make sense, but then why does some heights show as feet , for example 6900, and others as 15K for example?

                                          1 Reply Last reply Reply Quote 0
                                          • ilua1981I
                                            ilua1981
                                            last edited by

                                            Hi, Precipitation is indicated in mm (millimeters) as I understand the intensity of precipitation? Or accumulation? if intensity, then probably the dimension is mm/minute? And if so, then it can be daily, semi-daily. can you clarify? Привет, осадки, указаны в мм ( миллиметры) это как понимаю интенсивность осадков? Или накопление? если интенсивность, то наверное размерность мм/минуту ? И если так, то она может быть суточная, полу суточная. можно уточнить?

                                            Илья

                                            idefix37I 1 Reply Last reply Reply Quote 0
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