HLSTO has various meanings in the NOTAM Contractions category. Discover the full forms, definitions, and usage contexts of HLSTO in NOTAM Contractions.
A pellet of hail. Hailstones may be spheroidal, conical, or generally irregular in shape. The spheroidal stones often exhibit a layered internal structure, with layers of ice containing many air bubbles alternating with layers of relatively clear ice. These probably correspond to dry growth and wet growth and are called rime and glaze, respectively.
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