Severe Weather 101: Hail Basics by NOAA (source code)

= Severe Weather 101: Hail Basics by NOAA
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https://www.nssl.noaa.gov/education/svrwx101/hail/

National Severe Storms Laboratory explanation of hail growth, updraft support and ice layering. It explicitly rejects treating the layers simply as a record of repeated up-and-down cycles.