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<br />These two figures illustrate that the basic water balance over the oro- <br />graphic barrier can be changed significantly in stable clouds. When the <br />natural process is inefficient, seeding inc:reased efficiency. The reverse <br />occurred where the natural efficiency was large. <br /> <br />Similar curves for unstable clouds showed no conclusive difference <br />between seeded and control samples. The lack of positive effects in unstable <br />clouds may be attributable to the narrowness of the San Juan barrier. Any <br />additional snowflakes tend to be blown beyond the narrow barrier and evaporate <br />before they can fall to the ground. Over SL wider barrier, with a broad crest, <br />they would have time to fall to the ground and add to the snowpack. <br /> <br />-15- <br />