Winter Orographic Cloud Seeding over the Kaweah River Basin in California

Authors

  • M E Solak Atmospherics Incorporated Fresno, California
  • T J Henderson Atmospherics Incorporated Fresno, California
  • R B Allan Atmospherics Incorporated Fresno, California
  • D W Duckering Atmospherics Incorporated Fresno, California

Abstract

An ongoing program of operational cloud seeding for precipitation increase over the Kaweah River basin in California’s southern Sierra Nevada has been conducted for eleven seasons. A 13% increase in average annual streamflow is indicated by target-control regression analysis of overall seeding effectiveness, with an attendant statistical significance of better than .01. Support for the regression analysis results is found in comparisons of the seeded period regression line against the base period regression line and in comparisons of radar characteristics of seeded and not-seeded radar echoes. The program’s basic design, operations and evaluations are described.

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Scientific Papers