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<br />.. <br /> <br />0033G2 <br /> <br />south easterly wind, 12-24 with a southerly wind, 25-29 with a mostly <br /> <br />westerly wind, and 30-34, 1-3, and 69 with a north westerly wind direction. <br /> <br />The generators in the northern sector burn a solution of 2% AgI- <br /> <br />NH4I disolved in acetone and the southern sector generators burn a 4% <br /> <br />AgI, with 1.25% NaI solution disolved in acetone. All generators have a <br /> <br />variable output ranging between 5 and 40 grams of AgI per hour. Tests <br /> <br />have shown each gram of seeding material capable of producing approximately <br />1015 effective ice nuclei at -20C. The times, rates, and generators to <br /> <br />be used are specified by the licensed operators from the operational <br /> <br />cloud seeding firms. The local operator of the generator is then tele- <br /> <br />phoned and given directions on the operation of the generator desired <br /> <br />for that day. Each local operator keeps a log and reports back to the <br /> <br />commercial seeding firm what operation actually took place. <br /> <br />An aircraft has also been contracted to seed the northern Front <br /> <br />Range during upslope (east wind) snow storms. The plane is a twin <br /> <br />engine Piper Navajo with a single ice nucleus generator mounted on the <br /> <br />belly of the plane. This generator burns the same solution as the <br /> <br />northern ground based seeding generators with a constant output of 2 <br /> <br />gal. per hour. It was contracted to seed during the months of November, <br /> <br />December, March, and April. <br /> <br />D. Operational Sequence <br /> <br />A typical day in the operational seeding program begins with Western <br />Weather Consultants making their weather forecast for the day. Most of <br /> <br />the data used for this forecast is that available from the National <br /> <br />Weather Service. This data is routinely received at their forecasting <br /> <br />center in Durango, and it is also provided to the technical coordinator <br /> <br />through the CSU Atmospheric Science Department. The forecast center in <br /> <br />17 <br />