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    How to know if it will hail

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    • K
      Kebab5 last edited by

      Hi folks,

      I'm not an expert so for me it is difficult to interpret all the values I see in the app but I'm specifically interested in knowing the probability of hail. I've read that some numbers may mean severe storms including hail but I couldn't really understand how to read the data in the app. I think it would be nice to have a map that shows hail forecast but I'm not sure if this is scientifically possible. Any help would be greatly appreciated.

      idefix37 petra.pik M Gkikas LGPZ 4 Replies Last reply Reply Quote 0
      • idefix37
        idefix37 Sailor Moderator @Kebab5 last edited by idefix37

        @kebab5
        Yes, it’s very difficult to predict hail, and there is not such possibility on Windy, or at least not directly.
        Hail is linked to very strong thunderstorms. So you can use the Thunderstorm layer to estimate the risk of such storm in your area during the day.

        C0EB200F-77E6-4527-82E2-53EAF49F3BFF.jpeg

        One or two hour before you may have a look at Satellite Infra+ layer. The colorised clouds indicate the temperature of cloud tops. The colder they are (colorised in deep red, sign of danger) the highest they are. And the highest are generally Cumulonimbus ones, which are the clouds which generate hail.

        6E272E42-8530-4EA9-A610-130C141BDA23.jpeg

        In addition you should listen to your local and official weather advisories.

        K 1 Reply Last reply Reply Quote 3
        • petra.pik
          petra.pik @Kebab5 last edited by petra.pik

          Hi @kebab5, you can also check the layer 'Precip. type'. The brown color indicates hail/ice pellets.

          Screenshot 2022-06-07 at 15.22.17.png

          Petra

          idefix37 1 Reply Last reply Reply Quote 1
          • idefix37
            idefix37 Sailor Moderator @petra.pik last edited by idefix37

            @petra-pik
            Sorry Petra, but ice pellets are different from hail.
            Hail is produced during thunderstorms in hot season, whereas ice pellets are observed in colder seasons, sometime during convective snow precipitation.
            http://www.anti-grele.fr/en/anatomy/

            At the moment in north hemisphere, you do NOT see ice pellets in the Precipitation types layer in the areas where there are heavy thunderstorms and hail. Ice pellets are only seen this week in cold zones, in high latitudes (65°N and more) or in Tibet, where there are cold precipitations like snow, freezing rain…

            petra.pik 1 Reply Last reply Reply Quote 2
            • M
              melanie75 @Kebab5 last edited by

              @kebab5 said in How to know if it will hail:

              Hi @wordle game

              I'm not an expert so for me it is difficult to interpret all the values I see in the app but I'm specifically interested in knowing the probability of hail. I've read that some numbers may mean severe storms including hail but I couldn't really understand how to read the data in the app. I think it would be nice to have a map that shows hail forecast but I'm not sure if this is scientifically possible. Any help would be greatly appreciated.

              I also wonder if hail can damage farmers. So what can they do to prevent this?

              Gkikas LGPZ M 2 Replies Last reply Reply Quote 0
              • petra.pik
                petra.pik @idefix37 last edited by

                @idefix37 thank you for the explanation :)

                Petra

                1 Reply Last reply Reply Quote 1
                • Gkikas LGPZ
                  Gkikas LGPZ Moderator @Kebab5 last edited by

                  @kebab5
                  If in USA, then https://mrms.nssl.noaa.gov/qvs/product_viewer/
                  In general you may expect hail if in radar you see echoes with dBZ more than 50

                  1 Reply Last reply Reply Quote 2
                  • Gkikas LGPZ
                    Gkikas LGPZ Moderator @melanie75 last edited by

                    @melanie75
                    In Greece, and in some other countries, we use "hail nets"

                    4c020abd-54ec-4ca1-92ae-32189ef4c0a6-εικόνα.png

                    Also, the Greek Agricultural Insurance Organization runs a
                    Hail Suppression Program with Airborne Means.
                    The Program is based on the conceptual model of "Beneficial Competition", introducing artificial
                    nuclei in the hailstorms that compete with the natural ones for the available supercooled water,
                    forming smaller hailstones, thus increasing the possibility to melt during their fall, reaching the
                    ground as rain.

                    idefix37 laura79 2 Replies Last reply Reply Quote 2
                    • idefix37
                      idefix37 Sailor Moderator @Gkikas LGPZ last edited by idefix37

                      @gkikas-lgpz
                      In France hail nets are used too, in fruit trees plantations.

                      Are you using cloud seeding with silver iodide or other chemical as explained here:
                      https://en.m.wikipedia.org/wiki/Cloud_seeding
                      I don’t think it is used in France.

                      Here there are people using locally hail cannon:
                      https://en.m.wikipedia.org/wiki/Hail_cannon

                      But difficult to prove that it works very well.

                      Gkikas LGPZ 1 Reply Last reply Reply Quote 0
                      • Gkikas LGPZ
                        Gkikas LGPZ Moderator @idefix37 last edited by

                        @idefix37
                        We use seeding of Silver Iodide (AgI) or dry ice from aircrafts to the target area.
                        For more info:

                        https://www.3dsa.gr/en/activities-en/weather-modification

                        idefix37 1 Reply Last reply Reply Quote 0
                        • idefix37
                          idefix37 Sailor Moderator @Gkikas LGPZ last edited by idefix37

                          @gkikas-lgpz
                          Interesting, so in Greece they use the same technology to increase rainfall ? I heard the Chineses carry a similar program for rain too.
                          In France in some vineyards and fruit trees plantations they use anti-hail rockets but not planes.

                          Gkikas LGPZ 1 Reply Last reply Reply Quote 0
                          • K
                            Kebab5 @idefix37 last edited by

                            @idefix37 Thank you for the information! I believe the Satellite Infra+ layer is the one I can see when I go to Menu>More Layers>Satellite>More in the bottom>IR.

                            @petra-pik thank you for the point on 'Precip. type'. I was also initially thinking that it would give an idea.

                            idefix37 1 Reply Last reply Reply Quote 0
                            • idefix37
                              idefix37 Sailor Moderator @Kebab5 last edited by

                              @kebab5 said in How to know if it will hail:

                              I believe the Satellite Infra+ layer is the one I can see when I go to Menu>More Layers>Satellite>More in the bottom>IR.

                              Yes, select Infra+

                              2955093C-F5AC-4283-ABA2-9EEBEA4034FE.jpeg

                              Risk of hail is shown by red / dark red top clouds

                              1 Reply Last reply Reply Quote 3
                              • Gkikas LGPZ
                                Gkikas LGPZ Moderator @idefix37 last edited by

                                @idefix37
                                Back in the 90's we run a rain enhancement project
                                but the effectiveness was questionable.
                                .
                                Yesterday's hail as seen from wx. radar south of Larissa
                                and the flight path of aircraft for hail suppression .

                                a92d07e1-09d6-4603-af8d-5288fe085f22-εικόνα.png

                                1 Reply Last reply Reply Quote 1
                                • M
                                  mytom2 @melanie75 last edited by

                                  @melanie75 said in How to know if it will hail:

                                  @kebab5 said in How to know if it will hail:

                                  Hi @wordle online

                                  I'm not an expert so for me it is difficult to interpret all the values I see in the app but I'm specifically interested in knowing the probability of hail. I've read that some numbers may mean severe storms including hail but I couldn't really understand how to read the data in the app. I think it would be nice to have a map that shows hail forecast but I'm not sure if this is scientifically possible. Any help would be greatly appreciated.

                                  I think we need to depend on the hydrometeorological center to know exactly about the weather.

                                  wordle online

                                  1 Reply Last reply Reply Quote 0
                                  • laura79
                                    laura79 @Gkikas LGPZ last edited by

                                    @Gkikas-LGPZ eso es una excelente idea👏

                                    maria laura

                                    1 Reply Last reply Reply Quote 0
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