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    • Hydrology and Water Resources in Arizona and the Southwest, Volume 02 (1972)
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    Weather Modification in Arizona, 1971

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    Author
    Osborn, Herbert B.
    Affiliation
    USDA-ARS Southwest Watershed Research Center, Tucson, Arizona
    Issue Date
    1972-05-06
    Keywords
    Hydrology -- Arizona.
    Water resources development -- Arizona.
    Hydrology -- Southwestern states.
    Water resources development -- Southwestern states.
    Weather modification
    Thunderstorms
    Cloud seeding
    Analysis
    Clouds
    Winds
    Rainfall
    Precipitation (atmospheric)
    Arizona
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    Copyright ©, where appropriate, is held by the author.
    Collection Information
    This article is part of the Hydrology and Water Resources in Arizona and the Southwest collections. Digital access to this material is made possible by the Arizona-Nevada Academy of Science and the University of Arizona Libraries. For more information about items in this collection, contact anashydrology@gmail.com.
    Publisher
    Arizona-Nevada Academy of Science
    Journal
    Hydrology and Water Resources in Arizona and the Southwest
    Abstract
    There have been many efforts in recent years to modify thunderstorms through cloud seeding. Collective cloud seeding efforts in Arizona before 1971 are reviewed and an operational convective cloud seeding program carried out in Arizona in the summer of 1971 is analyzed. The comprehensive Santa Catalina cloud seeding experiment (1957 to 1964) was a randomized seeding using silver iodide. Results of this experiment are uncertain as numerous interpretations are possible. Numerous individual experiments from 1966 to 1970 at flagstaff were conducted, with uncertain results. An intensive program of seeding individual cumulus clouds with silver iodide was carried out in the summer of 1971 in central and eastern Arizona. No statistically significant changes were noted. Results of the Catalina experiment imply that seeding decreased rainfall on and downwind from the target. Two other experiments were inconclusive. Nine figures show precipitation patterns.
    ISSN
    0272-6106
    Collections
    Hydrology and Water Resources in Arizona and the Southwest, Volume 02 (1972)

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