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<br />14. Controlling Weather .ModificRtion Operations (cont) <br /> <br />State Patrol, and field maintenance personnel in the seeded areas. <br /> <br /> <br />Changing weather conditions that would indicate the onset of poten- <br /> <br /> <br />tial1y severe or hazardous weather conditions will result 'in the <br /> <br /> <br />sllspension of seeding operations throughout the duration of these <br /> <br /> <br />potentially hazardous weather conditions. <br /> <br />Sno~pack accumulation ~ill be monitored from snow survey measure- <br /> <br /> <br />ments as conducted by the Soil Conservation Sel'vice. Special snow <br /> <br /> <br />~easurements may be available from selected high mountain sites about <br /> <br /> <br />January I, 1979. Regular snow measurements will commence for all <br /> <br /> <br />snow observation sites on February 1, 1979 and the first detailed <br /> <br /> <br />analysis of snow accumulations in the seeded areas will be completed <br /> <br /> <br />using these measurements. <br /> <br />Recent evaluations of snowpack and sno~~elt runoff in, the sping- <br /> <br /> <br />time indicate that minor flooding and stream flow problems can exist <br /> <br /> <br />when la te ~'inter snowpacks rench ISO pel.cent of normal. ' More sub- . <br /> <br /> <br />stantial flooding problems can be anticipated when late winter snov- <br /> <br /> <br />packs in excess of 170 percent of normal melt off in the springtime. <br /> <br /> <br />Since this program is designed for r"asonable lcvels of sno~'Pack <br /> <br /> <br />enhancement for an outlook of an adeq\lately abundnnt summertime vater. <br /> <br /> <br />supply for storage and use, we propose to suspend seeding operations. <br /> <br /> <br />in any major portion of a seeding area when one or more of the <br /> <br /> <br />following occurrences takes place:. <br /> <br />a. When the ave;age snowpack reaches 175 percent of normal. snow- <br />pack.during the months of November through January. <br /> <br />b. \.rhen the average l!nowpack reaches 150 percent .of normal soo"'- <br />pack during the month of February. <br /> <br />Seeding operations would continue in the remaining mountain <br /> <br /> <br />regions under nOl.mlil operative proc!:'dures.. This comparative normal <br /> <br /> <br />for these representative sn0W observation sites ~ill be the latest <br /> <br /> <br />fifteen-year average as published by the 5011 Conservati6n Service. <br /> <br />-10- <br />