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e e e .. Orographic cloud PET (precipitation echo type) Plume Primary response variable Radar box Randomization Seeder scientist a cloud whose form and extent are determined by the disturbing effects of mountains upon the passing flow of air. a system for classifying storm conditions primarily using radar echo patterns. Similar kinematic and microphysical fea- tures (e.g., scattered convection, broken convection, area-wide, banded, etc.) are i dent ifi ed. the swept-out volume of the seeding products during their fall to the ground. a measurable quantity which can assume different values in response to treatment and represents an important link in the chain of physical events. The quantity also should be as sensitive to seeding as possible. the rectangle defined in the radar space at fixed times after seeding to evaluate the coverage and intensity of seeding effects on radar reflectivity. The rectangle has a length of 45 km and is parallel to the seeding line. The width varies depending on time after seedi ng. The box is defi ned at v ari ab 1 e d i st ances downwi nd of the seed i ng line dependent upon windspeed. the chance assignment of treatments (i.e., C02 or no CO2) to clouds or treatment un it s . The as s i gnment is made secret 1 y to avoid biases in treatment, measurements, or an a 1 ys is. the scientist flying in the right seat of the seeder aircraft who conducts the seed- ing~ helps to locate the appropriate loca- tion for the seeding line with the seeding coordinator, coordinates the selection of cells along the seeding line with the cloud physics scientist, and operates the data acquisition system on the seeder aircraft. xi