Abstract
Abstract Experimental and operational cloud seeding in Israel has been conducted since 1961 by aircraft seeding of silver iodide (AgI) at cloud-base level along a line upwind of target areas. The first experiment, Israeli-1 (1961–67), had a crossover design. Its overall seeding effect was an enhancement of 15% of the rainfall in the target areas, significant at 0.9%. The second experiment, Israeli-2 (1969–75), had a generally similar crossover statistical design to that of Israeli-1 but with some modifications that allowed a separate evaluation of the north target area alone. The seeding effect obtained for the north alone was 13%, significant at 2.8%. Based on this, clouds in northern Israel have been seeded operationally since 1975, while randomized experimental seeding is continuing in the south as Israeli-3. Recent analyses of both targets of the Israeli-2 experiment indicated that rainfall was not enhanced in the south target area. Preliminary and intermediate analyses of Israeli-3 do not indicate ra...
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