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2. Weather Data Available Western Weather Consul~has a regular National Weather Service Facsimile Circuit, teletype circuits "A" and "c" whiCh provide routine and special weather infonnation fran the National Weather Service. They also have a computer terminal whiCh allCMs receipt of specialized weather and cloud rrodel data fran the Bureau of Reclamation computer facilities in Denver. The data available include synoptic surface and upper air charts (also individual rawin and pibal observations), satellite maps, local weather observations, including cloud conditions and precipitation =ence and arrounts. Using these data, YfiIC will prepare daily foreca!:!ts upon whiCh seeding decisions will made. Selected weather Charts area se ility forecast will be relayed by telefax copier to the CIC Control Center eaCh- IlOrning. Upon receipt of the hard copy infonnation, a telephone conference will be held between CIC and WV;C for the purpose of coordlllatLng me forecast and finalizing seeding :g.laIlli i'tJL- the cay. 3. Description of seeding devices, materials and s etc. irty-five, ually operated, ground based silver iodide (AgI) generatci located in the western portions of the project area. These AgI generators are of the basic type used in projects throughout Colorado, California, and Utah. They are basically known as "Skyfire" generators with recent technical adaptations. These generators have proven to be reliable and safe for this type of opera- tion. Nuclei efficiencies in terms of nuclei generated per gram of solution burned have been calibrated by the CSU Cloud Simulation Laboratory. The l\QI-NH410,-acetone solutions burned will contain 2.0% ~ The sol11tion will burn in a propane Harre at rates vmich are ' adjustable frrm 10 qallhr to . S g" 1 /hr At these flCM rates, 7 grams to 36 grarrSof AgT mn be vaporized into ice nuclei. The ~ce lloclei Xield at -20"C, for example, is approximately 10 5-act'Ive nuclei per gram. r-- Aircraft seeding of the northern front range will be accomplished by a turbo-Charged twin engine seeder plane. It has complete flight instrurrentation and avionics equipnent for IFR flight. In addition, it has de-icing devices to enable flight in winter storms. '!he airborne AgI generators are of similar construc- tion and principal of operation as the ground based generators. Two generators will be on the aircraft, one on eaCh wing tip. EaCh genera- tor can carry 7 gallons of solution. We plan to operate one generawr at a tlI,., wi tl. a flCM rate of :z-;5J gallons per hour, or about 185 grams of AgI per hour. The nuclei output per gram is approximately the sarre as with the ground generators.