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2002 JOURNAL OF CLIMATE AND APPLIED METEOROLOGY VOLUME 22 A .05 V 1.80 10 km ZONE 1 Seeding Sites .05 1.6000 ~O KEY 2000 ft Contours Shown Q Wilcoxon Probability Y Y Double Ratio Scale (kilometers) o 10 ..........---- FIG. 3. Map of Wilcoxon probabilities and mean double ratios for 100 days with Ridge temperatures ~ -9.0oC. Ridge temperature and the daily mean of all available T700 observations. The mean of Ridge temperature and T700 were -12.2 and -13.4 oC, respectively for the days with T700 ~ -90C. This also helps explain the similarity in the results. One notable difference between the Ridge temperature and T700 partitions is that the latter sugggested decreased snowfall associated with seeding downwind of the intended target for tem- peratures between -10.5 and -13.80C. c. Partitioning by cloud-top temperature It is of interest to partition the BRE precipitation data by cloud-top temperature because of the impor- tance given this parameter in past analyses of cloud seeding experiments. For example, Grant and Elliott (1974) presented the concept of a cloud seeding tem- perature "window", based on a number of experiments. They argue that a cloud-top temperature window exists TABLE 6. 700 mb temperature partitions: fractions of all days. Wilcoxon (W) and MRPP one-tailed probabilities are for 3 zones of Fig. I. Experimental days Zone I Zone 2 Zone 3 Range (oC) All sins W MRPP W MRPP. W MRPP -26.0/+1.0 154 75/79 0.12 0.13 0.34 0.36 0.17 0.18 -10.4/+ 1.0 '77 36/41 0.48 0.50 0.48 0.50 0.21 0.27 - 26.0/-10.5 77 39/38 0.05 0.05 0.40 0.37 0.39 0.35 -9.0/+ 1.0 51 24/27 0.29 0,36 0.26 0.32 0.47 0.39 -12.8/-9.1 51 28/23 0.40 0.40 0.47 0.50 0.34 0.43 -26.0/-12.9 52 23/29 0.01 0.01 0.14 0.14 0.20 0.20 -7.91+ 1.0 38 17/21 0.49 0.38 0.38 0.50 0.39 0.32 -10.4/-8.0 39 19/20 0.47 0.41 0.46 0.50 0.16 0.16 -13.8/-10.5 39 23/16 0.43 0.37 0.03 0.04 0.04 0.05 -26.0/--13.9 38 16/22 0.02 0.03 0.04 0.07 0.12 0.17 .