Subj : ES Picture of the Day 19  2023
To   : All
From : Dan Richter
Date : Thu Jan 19 2023 11:00:36

 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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