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    Precipitation type - newly added

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    • Gkikas LGPZ
      Gkikas LGPZ Moderator @Tomber42 last edited by

      @tomber42
      Smaller than hailstones. Less than 5 mm in diameter.

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

        Also, sleet tends to be softer pellets where hail is frozen rock hard.


        JamesInSanDiego
        San Diego, CA USA

        1 Reply Last reply Reply Quote 2
        • Tomber42
          Tomber42 Moderator last edited by

          Ahh.. Ok, now I know.. in German. we say Graupel

          Greetings from Tomber

          1 Reply Last reply Reply Quote 1
          • Marienka
            Marienka @Tomber42 last edited by Marienka

            Hi @Tomber42 , it's different. We don't actually have a "hail" icon nor a layer for it. Hail normally occurs in rainstorm or thunderstorm, and is the result of strong updrafts that repeatedly carry growing chunks of ice upwards into the clouds. Unlike freezing rain, graupel or ice pellets (that are softer and smaller in size), hail is hard as stones, bigger in size and causes extreme damage (dents in metal etc)... In general, hail is difficult to predict as there are quite a few ingoing influences and complicating factors that interfere with the course of the storm.

            As @JimInSanDiego correctly summed it up: Hail is a warm weather issue, while freezing rain or ice pellets (sleet) are manifestations of cold weather.

            Best wishes
            ~ Marie

            1 Reply Last reply Reply Quote 0
            • Marienka
              Marienka @Marienka last edited by Marienka

              Here is a quick tutorial to describe the differences between: hail, graupel (soft hail / snow pellets), ice pellets (sleet) and freezing rain. Wikipedia puts it this way:

              HAIL is a form of solid precipitation. It is distinct from ice pellets (American sleet), though the two are often confused. It consists of balls or irregular lumps of ice, each of which is called a hailstone. [...] Unlike other forms of water ice such as graupel, which is made of rime, and ice pellets, which are smaller and translucent, hailstones usually measure between 5 millimetres (0.2 in) and 15 centimetres (6 in) in diameter.
              In more detail: https://en.wikipedia.org/wiki/Hail

              GRAUPEL (from German language), also called SOFT HAIL or SNOW PELLETS, is precipitation that forms when supercooled water droplets are collected and freeze on falling snowflakes, forming 2–5 mm (0.08–0.20 in) balls of rime. Graupel is distinct from hail, small hail and ice pellets: the World Meteorological Organization defines small hail as snow pellets encapsulated by ice, a precipitation halfway between graupel and hail.
              In more detail: https://en.wikipedia.org/wiki/Graupel

              ICE PELLETS (American: SLEET) are rain drops that have frozen before they hit the ground. When they hit the ground, they bounce. Ice pellets are also called sleet and can be accompanied by freezing rain. In winter, precipitation usually begins falling out of a cloud as ice particles.
              In more detail: https://en.wikipedia.org/wiki/Ice_pellets

              FREEZING RAIN is the name given to rain precipitation that freezes on contact on surfaces maintained at temperature below freezing by the ambient air mass. Unlike sleet, a mixture of rain and snow, ice pellets, or hail, freezing rain is made entirely of liquid droplets. The raindrops become supercooled while passing through a sub-freezing layer of air hundreds of meters above the ground, and then freeze upon impact with any surface they encounter...
              In more detail: https://en.wikipedia.org/wiki/Freezing_rain

              Best wishes
              ~ Marie

              1 Reply Last reply Reply Quote 4
              • Marienka
                Marienka last edited by

                Here I found some interesting link with illustrative pictures:
                Will it [freezing] RAIN, SLEET or SNOW?

                http://www.weather.gov/source/zhu/ZHU_Training_Page/winter_stuff/winter_wx/winter_wx.html

                Best wishes
                ~ Marie

                1 Reply Last reply Reply Quote 5
                • A
                  artmunich last edited by

                  And what is wet snow? What's the difference between wet snow and rain with snow?

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

                    @artmunich
                    https://en.wikipedia.org/wiki/Rain_and_snow_mixed

                    http://theweatherprediction.com/habyhints2/650/

                    1 Reply Last reply Reply Quote 1
                    • eshtewi
                      eshtewi last edited by

                      0_1538980019654_134 (2).jpg

                      1 Reply Last reply Reply Quote 1
                      • A
                        asakalli last edited by asakalli

                        Dear All, Dear @Marienka
                        may I ask the algorithm behind this new overlay? I'd like to use the same algorithm to calculate the type of precipitation in my country. I'm running WRF model for my research activities at the Iskenderun Technical University. Thank you very much for your response in advance.
                        Happy new year to all.

                        1 Reply Last reply Reply Quote 1
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