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    Precipitation type - newly added

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    • MarienkaM
      Marienka
      last edited by Marienka

      We have just launched the "Precipitation type" overlay, displaying these types of precipitation:

      Rain, Freezing rain, Mixed ice, Snow, Wet snow, Rain with snow, Ice pellets.

      Best wishes
      ~ Marie

      MarienkaM E 2 Replies Last reply Reply Quote 2
      • Tomber42T
        Tomber42 Moderator
        last edited by

        What does Ice pellets mean? Is it hail?

        Greetings from Tomber

        Gkikas LGPZG MarienkaM 2 Replies Last reply Reply Quote 0
        • JimInSanDiegoJ
          JimInSanDiego Moderator
          last edited by

          My guess is having lived in a northern part of the US in the past, we called it sleet. The difference is raindrops fall but freeze before hitting the ground. Hail bounces around up in the air adding layer and layers. Sleet is a cold weather issue and hail is a warm weather issue.


          JamesInSanDiego
          San Diego, CA USA

          1 Reply Last reply Reply Quote 4
          • Gkikas LGPZG
            Gkikas LGPZ Moderator Meteorologist @Tomber42
            last edited by

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

            JimInSanDiegoJ 1 Reply Last reply Reply Quote 1
            • JimInSanDiegoJ
              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
              • Tomber42T
                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
                • MarienkaM
                  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
                  • MarienkaM
                    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
                    • MarienkaM
                      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 LGPZG 1 Reply Last reply Reply Quote 0
                        • Gkikas LGPZG
                          Gkikas LGPZ Moderator Meteorologist @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
                          • eshtewiE
                            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
                              • ivoI ivo referenced this topic on
                              • E
                                esheesle @Marienka
                                last edited by

                                @Marienka How often is this overlay updated? It appears to be only hourly maybe?

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

                                  @esheesle It depends on the model, you check, and the plan you have. Premium is usually updated 4 times per day and you can check data with 1h step. Free offers 2 updates and 3h steps.
                                  5970a7b5-ca7f-44bc-b214-8f4ca4550f80-image.png

                                  1 Reply Last reply Reply Quote 0
                                  • briannaessB
                                    briannaess | Premium
                                    last edited by

                                    In general, I like having this overlay, though I wish it were combined with Radar. However, my primary complaint is that "Rain" is colored as light blue, which is often associated as snow on many other precipitation type maps offered by other services. I would suggest changing the color of Rain to green to be consistent with other maps to avoid confusion.

                                    1 Reply Last reply Reply Quote 2
                                    • S
                                      stpdgld
                                      last edited by stpdgld

                                      The precipitation type map shows predominantly dark gray and white. Those colors are not in the legend, so may I ask what those colors represent? I assume the dark gray represents no precipitation, but when I look up the current weather in the white areas, no precipitation exists there as well. Freezing point doesn't seem to be a factor either. Thanks! Screenshot 2025-01-11 120440.png

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

                                        @stpdgld
                                        White is in the legend even it is a sort of light gray to make the word “snow” in white letters readable.
                                        Grey is where there is no precipitation. This is quite obvious.

                                        36BEC7E6-E7DC-4F2C-A0BC-F56F9A449258.jpeg

                                        S 1 Reply Last reply Reply Quote 0
                                        • S
                                          stpdgld @idefix37
                                          last edited by

                                          @idefix37 Okay, thanks. I had a feeling the color shade was wrong in the legend, but when I looked up current weather in the white areas, it was not currently snowing in those locations.

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

                                            @stpdgld
                                            What model did you use for Precipitation types?
                                            Then are you talking about your own observations or the model snow forecast?

                                            S 1 Reply Last reply Reply Quote 0
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