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It is not anticipated that the Aztec will be used to gather cloud physics data below every cumulus cloud seeded on top. The number of such cases will be determined by the Project Director based on results obtained. 7.4.2 Convective (thunderstorm) Complexes Turrets associated with a thunderstorm complex will normally not be seeded unless there are no growing cumulus clouds available for seeding. On those occasions when the pilot of the seeding aircraft ~Navajo or Lear Jet) determines that suitable individual convective clouds are not avail- able for seeding and a thunderstorm complex with turrets exists, he may decide to seed the turrets associated with the thunderstorm complex. When the cloud has been selected for seeding, the pilot of the seeding aircraft will open the envelope which contains the type of seeding to be performed, i.e., light, heavy, or none at all. The pilot of the seeding airplane will notify the pilot of the Navajo cloud physics airplane of his cloud selection. The Navajo cloud physics airplane will then make a penetration of the turret selected for seeding, followed by seeding as appropriate by the seeding airplane, then followed by successive passes through the turret by the Navajo cloud physics airplane. The cloud seeding airplane will remain in the area if fuel permits for possible seeding of additional clouds. Each turret seeded will be treated in the same manner as if it were a growing convective cloud. No clouds will be seeded unless they are sampled by the cloud physics aircraft. The Navajo cloud physics airplane will continue to make penetrations (at an angle approximately 450 to the mean wind direction) until the turret dissipates or becomes too intense for safe penetration. After a turret has been seeded, the seeding aircraft will remain in the area if he has sufficient fuel and seed additional turrets associated with the thunderstorm complex after the cloud physics airplane has completed sampling of the turret previously seeded. On some occasions, at the discretion of the Project Director, the Aztec will be used for obtaining cloud physics information at the bases of convective complexes. This would be done by making traverses as described in Section 7.4.1 for cumulus clouds. 7.4.3 Lines of Convective (thunderstorm) Complexes When the Project Director has chosen a line to be seeded, he will deploy either the Lear Jet or the Navajo cloud seeding airplane which will seed heavy every turret possible along the line beginning as close to Big Spring as possible and extending outward along 26