The occurrence of seedable cloud In warm Season for mitigating water shortage problem.

Abstract

Water shortages have recently become a serious problem for many cities in Japan. Since 2006, Japanese Cloud-seeding Experiments for Precipitation Augmentation (JCSEPA) have been conducted in Japan for mitigating water shortages in summer. On comparing months with and without water shortages, the total rainfall was small in the water shortage months, while the occurrence of clouds did not differ. For convenience, the precipitation efficiency was defined as the ratio of the areal rainfall rate to the occurrence of clouds. The clouds in the months of water shortage had a low efficiency of precipitation. Nevertheless, potentially seedable clouds existed in the period of water shortage.