Two basic experiments have been proposed for Project STORMFURY Operations 1969. In the Eyewall Experiment, seeding and monitoring of the changes in the structure and circulation of a well-developed hurricane will be attempted, if nature provides the proper storm at the right time and place. Hurricane seeding will be done at two-hour intervals over an eight-hour period. The rainband experiment consists of four primary objectives: namely, (1) Conduct a detailed, dynamic and thermodynamic investigation of the rainband; (2) Carry out seeding experiments to determine if the basic character of the rainband can be changed by seeding; (3) study the role the rainband plays in the total storm structure; and (4) investigate how its modification might affect the total behavior of the storm. (Author).