1948–1949 Trials of the Schaefer-Langmuir Cloud-Seeding Technique in Hawaii

Fifteen tests during 1948–49 involving thirty-seven individual cloud inoculations over the islands of Lanai and Molokai are described. With regard to the role of the dry ice in causing the observed rainfall, the tests are too few in number to be considered conclusive, but the large rainfall values associated With seeded clouds are of particular interest. The largest rains seem to be associated with clouds where cloud top temperatures are slightly colder than 0° C and such clouds are also relatively thick. The relative importance of cloud thickness and temperature cannot be determined from the available data.