In the US “sleet” is the term for a winter precipitation that occurs when snow falls through a layer of warm air and melts into water droplets, then re-freezes into ice pellets as it passes through colder air closer to the ground. In many other areas that were part of the British empire that precipitation is called “ice pellets” and “sleet” instead refers to a mix of snow and rain. In the US that’s called a “wintry mix.”

  • WxFisch@lemmy.world
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    14 hours ago

    Hail is formed through a completely different process and is a spring/summer precip type associated with thunderstorms. It forms as water gets lifted high into the atmosphere from updrafts in the thunderstorm then fall before getting lifted again. Hail often shows layers (like a jawbreaker) and can grow very large.

    In the US, sleet/graupel is essentially just a frozen raindrop and is a winter precip type. Wintry mix is what the US National Weather Service uses for any mix of rain, snow, sleet, graupel, and freezing rain. The WMO and Europe use Ice Pellets for frozen raindrops and Sleet for mixed rain and snow. So both are official terms depending on where you are.

    • Horsecook@sh.itjust.works
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      14 hours ago

      But to the layman, attempting to describe balls of ice falling from the sky, and not the process that formed them, is there any practical distinction to be made between ice pellets and hail?

      • Ookami38@sh.itjust.works
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        8 hours ago

        Sleet is basically crunchy snow. Very slightly larger, a bit harder, not really a danger to much of anything it falls on. You don’t get golf ball sized sleet, you get like, half-a-pea-sized sleet.

      • WxFisch@lemmy.world
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        14 hours ago

        Yes, hail is from thunderstorms and is generally larger, ice pellets are winter precipitation and almost always smaller. Hail usually lasts only a few minutes, ice pellets can last many hours.

    • ccunning@lemmy.world
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      14 hours ago

      Yes! This is also my understanding. I’ve even experienced hail in hot tropical countries.