(1) Pilot study of seedable cloud analysis and feasibility evaluation
(2) Development and sophistication of critical technologies for evaluation of seeding effects
(3) Customization in practice of comprehensive weather modification technologies
In this talk, present status of precipitation enhancement research related to steps (1) and (2) for glaciogenic and hygroscopic seeding is reviewed mainly based on the results from the previous Japanese weather modification “research” projects, which consisted of laboratory experiments, field observation and numerical modeling. The present status will be summarized as follows.
a. Glaciogenic seeding techniques for mixed-phased orographic clouds, using dry-ice or AgI particles, are almost established and effective if the conditions meet. Major question is if AgI particles from ground-based generators are effectively delivered in right places in clouds?
b. Hygroscopic seeding to warm clouds may be effective under limited conditions although a large amount of seeding material is needed.