MSGID: 1:317/3 63c98544   
   PID: hpt/lnx 1.9.0-cur 2019-01-08   
   TID: hpt/lnx 1.9.0-cur 2019-01-08   
    EPOD - a service of USRA   
      
   The Earth Science Picture of the Day (EPOD) highlights the diverse processes   
   and phenomena which shape our planet and our lives. EPOD will collect and   
   archive photos, imagery, graphics, and artwork with short explanatory   
   captions and links exemplifying features within the Earth system. The   
   community is invited to contribute digital imagery, short captions and   
   relevant links.   
      
      
    Different Ice Patterns Inside a Hailstone   
      
      January 19, 2023   
      
       Mario-Freitas-Nov23-2022   
      
      Photographer:  Mario Freitas   
      
      Summary Author:  Mario Freitas   
      
      The photo above was taken just after a violent spring storm in   
       Curitiba, Brazil. The collected 1-inch diameter (2.54 cm)   
       hailstone fragment shows a milky nucleus surrounded by alternating   
      rings of transparent and  translucent  ice.   
      
      Hail can be formed when  thunderstorm drafts carry up raindrops into   
      higher freezing layers of the  atmosphere. A hailstone grows inside   
      a cloud each time it collides with water drops making them freeze onto   
      its surface, until an upper limit is reached when the updraft can no   
      longer support its weight,  causing it to fall and impacting the   
      ground.  Microphysical processes determine density, structure, and   
      sizes of hailstones. At very high altitudes,  temperature can be so   
      low that few liquid water drops remain, so hailstones don’t reach   
      significative sizes.   
      
      The structure of a cloudy  ice layer scatters light in all   
      directions because specific temperature conditions cause   
       supercooled liquid water to freeze instantaneously on hailstone   
      surfaces, resulting in cracked ice with trapped air bubbles ( dry   
      growth). Light is otherwise  refracted leading to the hailstones'   
      transparency if the water freezes slowly enough, permitting penetration   
      into the gaps before freezing and thus allowing air bubbles to escape   
      ( wet growth). Photo taken on November 23, 2022.   
      
      
      Curitiba, Brazil Coordinates: -25.4372, -49.2700   
      
      
   Related EPODs   
      
       Different Ice Patterns Inside a Hailstone  Summer Storm on the   
      Mediterranean  Lightning and the Eiffel Tower  Rainshaft Spotted   
      in New York  Waterspout Over Lake Los Molinos  Dust Cloud Near   
      Shadow Mountain, Nevada   
       More...   
      
   Severe Weather Links   
      
        *  World Severe Weather Information Center   
        *  Enhanced Fujita Scale   
        *  A Lightning Primer   
        *  More About Thunderstorms   
        *  Staying Safe Outdoors in Severe Weather   
        *  NOAA Storm Prediction Center   
        *  Patterns of Lightning Activity   
        *  US National Weather Service   
      
   -   
      Earth Science Picture of the Day is a service of the  Universities   
      Space Research Association.   
      
   https://epod.usra.edu   
       
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