Spongy Hailstone Growth Criteria I. Orientation Fabrics

Charles A. Knight National Center for Atmospheric Research, Boulder, Colo.

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Nancy C. Knight National Center for Atmospheric Research, Boulder, Colo.

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Abstract

The procedures required in measuring and representing hailstone orientation fabrics, and the reason for the development of one particular fabric, are discussed. Spongy growth has been found to give rise to a fabric with the c axes preferentially perpendicular to the growth direction. The origin of this fabric may be used as a spongy growth criterion. The natural hail examined did not have this fabric, and consequently did not grow spongy.

Abstract

The procedures required in measuring and representing hailstone orientation fabrics, and the reason for the development of one particular fabric, are discussed. Spongy growth has been found to give rise to a fabric with the c axes preferentially perpendicular to the growth direction. The origin of this fabric may be used as a spongy growth criterion. The natural hail examined did not have this fabric, and consequently did not grow spongy.

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