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<br />San Juan Operations <br />Summary Report <br />2 <br /> <br />this -- snow course readings on Red Mountain Pass for similar elevations <br />showed a decrease. <br /> <br />Figure 6 indicates the change in snowpack as a percent of normal for <br />the~period February 1 to May I, 1977. The only positive inference which <br />may be drawn is that for the summit of Wolf Creek Pass the snowpack <br />increased by 11% for the three-month period. <br /> <br />Figure 7 is a look at the two-month change in snowpack. It indicates <br />a positive change of three to seven percent for Wolf Creek Pass and also <br />east of Creede. A larger percentage change occurred to the northwest out- <br />side the seeding area -- indicating a storm track of more northwest to <br />southeast moving storms. Also, the north-facing slopes held their snow <br />cover well while the intense springtime sun quickly melted the snow on the <br />south-facing slopes. <br /> <br />In comparing Figure 6 to Figure 7 it is worthy to note that the snow- <br />pack from April 1 to May 1 in the northwest area decreased dramatically. <br />The change for the same period on Wolf Creek Pass summit increased! <br /> <br />Figure 8 is a composite chart showing the precipitation as a percent <br />of normal for February and March combined and the snowpack change in percent <br />for the same period. This definitely shows the severe extent of our mois- <br />ture deficiency for the two-month period with a large portion of the project <br />area receiving less than 50% of normal precipitation. <br /> <br />The maximum monthly snow course value of 8.4" was <br />at Wolf Creek Pass. This is the lowest water content <br />tion since records have been kept beginning in 1936. <br />previous low of 12.7" recorded in 1946. <br /> <br />observed on April 1st <br />recorded at this loca- <br />This exceeded the <br /> <br />Any meaningful statistical evaluation is not possible for a short <br />three-month program such as' this. With precipitation so drastically below <br />normal the snow course data also becomes inadequate to draw any meaningful <br />general area conclusions or inferences. <br /> <br />Figure 9 simply shows the location of the cloud seeding generators <br />for the 1977 program. <br /> <br />Figures 10 and 11 are plots of the percent of normal precipitation <br />