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<br />Abstract <br /> <br />A sin~ case study of a winter orographic cloud is presented in which the <br />I ~\ <br />effects of seeding with silver iodide, an AgI NH~I NH4CI04 mixture burned in <br /> <br />acetone, were observed to persist for over 90 min after seeding and 100 km <br /> <br />t: <br />downwind of the seedline. ~ research aircraft was able to locate and track <br /> <br />the line source of AgI even though, because of high natural concentrations of <br /> <br />ice in the cloud, changes in ice crystal concentration due to seeding were not <br /> <br />obvious until over 60 min after seeding was done. Ice nucleus measurements <br /> <br />confirmed the initial samplir.g of the seedline. The effectivity of the seeding <br /> <br />material in the field was over a factor of 10 higher than laboratory <br /> <br />measurements would suggest. <br />