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. Precipitation 2n Target ~ Versus Control ~ The mean depth of precipitation on the control area for the month of March, 1951, was found to be 62 percent of the normal mean depth of precipitation on the control area for the month of March; whereas, the mean depth of precipitation on the target area for the month of Harch, 1951, was found to be 52 percent of the normal mean depth of precipitation on the target area for the month of ~1arch, see Figs. 11 and 12 and Tables 17 and 15. Fig. 13 is an example of a correlation study between a precipitation station in the target area and a station in the control area. . "" ~ ~ Snowfall 2n Target ~ In the statistical study of the mean depth of snowfall on the target area the following results l~ere obtained. The flarch, 1951, mean depth of water content change on the target area was +3.5 inches as cODlpared to a thirteen-year normal of +3.1 inches, see Fig. 14 and Table 19. The April, 1951, mean depth of water content change on the target area was +1.1 inches as compared to a thirteen-year normal of 0.0 inches, see Fig. 15 and Table 19. Las tly, the summa ti on of Harch and April, 1951, mean depth of water content chanLe on the target area was +4.9 inches as compared to a thirteen-year normal of +3.1 inches, see Fig. 16 and Table 19. However, the greater than normal water content ehanges for March and April, 1951, apparently result from less than normal monthly temperatures, see Figs. 17 and 15, for the same periods. Note that the months which have below normal temperatures are also the months of high water content increases. Snowfall 2n Target ~ Versus Control ~ The mean depth or snow-water content Change on the control area for the period of March and April, 1951, was 147 percent of the thirteen-year normal; whereas, the mean depth of water content change on the target area for the same period was 158 percent of the thirteen-year normal. A good correlation with regard to snow pack exists between the control area selected and the target area, see Figs. 14, 15 and 16. Abnormally high snol.r-pack increase on both the target and control area is attrtbuted to subnormal te"~eratures which reduced the Dlelt during the Narch-l;ay, 1951, period. Precipitation 2n Western United States Fig. 19 reveals, in terms of percent variation from normal precipitation, how the seeded target area as well as other seeded areas compare with unseeded areas in western United States. Figures similar to Fig. 19 for the individual months of fiarch, April, and Nay, 1951, revealed that one heavy general storm, which fell in the latter part of Hay on the target area and on a large area imrnediately east of the target area, was responsible for increasing the precipitation " '. 6