After promising research, the use of hygroscopic materials, such as table salt, is becoming more popular. This can produce ice crystals at higher temperatures than silver iodide. Liquid propane, which expands into a gas, has also been used. The most common chemicals used for cloud seeding include silver iodide, potassium iodide and dry ice (solid carbon dioxide). Methodologies Salts Ground Based Silver Iodide Generator - Colorado, US Its effectiveness is debated some studies have suggested that it is "difficult to show clearly that cloud seeding has a very large effect." The usual objective is to increase precipitation (rain or snow), either for its own sake or to prevent precipitation from occurring in days afterward. Ĭloud seeding is a type of weather modification that aims to change the amount or type of precipitation that falls from clouds by dispersing substances into the air that serve as cloud condensation or ice nuclei, which alter the microphysical processes within the cloud. The process shown in the upper-right is what is happening in the cloud and the process of condensation upon the introduced material. ( January 2021)Ĭloud seeding can be done by ground generators, planes, or rockets This image explaining cloud seeding shows a substance - either silver iodide or dry ice - being dumped onto the cloud, which then becomes a rain shower. Please consider expanding the lead to provide an accessible overview of all important aspects of the article. This article's lead section may be too short to adequately summarize the key points.
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