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<br />t <br /> <br />~ <br /> <br />003351 <br /> <br />How Much Cloud Seeding Equipment is Being Used? <br /> <br />There are 116 ground generators located at sites upwind of all <br /> <br />mountain watersheds. The ones used at any time are dependent on <br /> <br /> <br />weather conditions, primarily wind direction and velocities. Typically <br /> <br /> <br />20 to 50 generators are in use at anyone time during a seeding operation. <br /> <br /> <br />Each generator can release from 5-40 grams per hour of seeding material <br /> <br /> <br />(silver iodide). Each gram of silver iodide will produce about 1015 <br /> <br /> <br />(1,000,000,000,000,000) ice nuclei effective at -20.C. Each one of <br /> <br /> <br />these could thoroughly produce a snow crystal. The generators to be <br /> <br /> <br />used and the seeding rate are specified for each operation by the <br /> <br /> <br />licensed meteorologists of the commercial weather modification companies. <br />, <br /> <br />One cloud seeding aircraft is available for seeding the east slope <br />of the northern Front Range when required. <br /> <br />How Much Cloud Seeding Has Been Carried Out? <br /> <br /> <br />Cloud seeding operations has taken place somewhere in the state on <br /> <br />63 of the 90 days from 18 November through 15 February. An average <br /> <br />of 45 of the 116 generators were operated on each of these 63 operational <br /> <br />days. Only portions of many of these 63 days were actually seeded since <br /> <br />other portions of these days were not suitable for cloud seeding. Each <br /> <br />of the generators operated an average of between 11 and 12 hours on an <br /> <br />operational day. <br /> <br />6 <br />