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<br />airplane will be equipped with 20-gm flares with burning times of either <br />45 sec or 7 min. The initial amount of silver iodide released will be <br />240 gm within a period of 3 min. Adjustments in the amount and rate of <br />release will be made depending on observed ice crystal concentrations. <br />5.1.2 Cloud Top <br />Cloud-top seeding will be accomplished in growing cumulus clouds <br />in the -40C to -IOoC region by use of eiT~er the turbo-charged Navajo <br />aircraft or the Lear Jet. These airplanes will be equipped with racks <br />containing 30 gm silver iodide flares which may be dropped into the cloud <br />in any number desired. Initially, 5 flares per kilometer will be dropped <br />when seeding an individual growing cumulus cloud. This should result in <br />100 or more ice crystals per liter. The number of flares required will <br />depend upon the size of the cloud, the diffusion rates of the silver <br />iodide within the cloud, and 'the concentration of ice crystals measured <br />by the cloud physics aircraft. Adjustments in the number of flares <br />dropped will be made depending on ice crystal concentrations measured by <br />the cloud physics aircraft. <br />5.2 Convective (thunderstorm) Complex <br />5.2.1 Semi-Isolated <br />Growing turrets associated with a thunderstorm complex will be seeded <br />from on top by either the Lear Jet or the Navajo. Each turret seeded <br />and measured will be treated as an event in the same manner that a.n <br />individual growing cumulus cloud is treated. If more than one turret <br />associated with a given thunderstorm complex is seeded, each turret will <br />be treated in its entirety before the treatment of the next one begins. <br />During .June both the Navajo and the Lear Jet will be used for seeding <br />thunderstorm complexes, but during July these systems will be seeded by <br />use of the Navajo only. While emphasis will be given to on-top seeding <br />of growing turrets, a limited number of convective complexes will be seeded <br />at their bases. This seeding will be done by the Aztec with 400 gm of <br />silver iodide being released in a time interval of 7 min. <br />5.2.2 Lines <br />Turrets associated with lines of convective complexes will be <br />seeded from on top in the -40C to -lOoC range by use of the Navajo and <br />Lear Jet aircraft. The turrets associated with these systems will be <br />seeded in the same manner as those associated with individual convective <br />complexes and only from on top. Seeding of the turrets will be accomplished <br />along a flight track approximately 450 to the wind direction in order <br />15 <br />