An Application of Hygroscopic Flares - A Single Case Study

Thomas J Henderson

Abstract


A case study is presented here of seeding a single cumulus cell with hygroscopic flares. The test took place on 31 July 1996 over a section of the South Fork of the San Joaquin River in the Sierra Range of California. A 5 cm radar system focused on the area noted that the seeded cell grew to higher altitudes, produced a more intense precipitation echo, and lasted longer than any of the non-seeded cumulus cells growing simultaneously in adjacent areas. As previously observed in several hygroscopic flare applications, it was confirmed again that, in addition to rain, abundant amounts of small graupel and clear hailstones were produced within the seeded cloud.

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