A Winter Cloud Seeding Program in Utah

Don A Griffith, John R Thompson, Dan A Risch


A winter orographic cloud seeding program has been conducted over the higher elevation areas of central and southern Utah for 13 winter seasons. The primary seeding mode has been ground-based, manually operated "silver iodide generators" located in valley and foothill locations upwind of the intended higher elevation target areas. The goal of this program is to augment naturally occurring snowfall in these higher elevation areas. Resulting augmented spring and summer streamflow is utilized for irrigation. A target/control evaluation of this program indicates approximately an average 11 percent increase in precipitation in the target area over that predicted from the control area precipitation. A similar evaluation of precipitation falling in a lower elevation region downwind of the intended target area indicates an average excess of approximately 15 percent.

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