When water droplets in liquid state take the form of ice crystals as the temperature is typically below 0 centigrade. The droplets cannot just hang in the air and fall on the earth in the form of rain.

Cloud seeding is the procedure to simulating precipitation and forming rain with the use of dry ice, into the upper part of clouds. As most of us know, rainfall starts from the crystals of cooled cloud droplets, by the use of the silver iodide particles the growth of novel ice particles is encouraged considerably. Be it winter or summer, clouds always are not enough for producing significant rainfall.

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Cloud Seeding Methods

Static cloud seeding

This method makes the use of a chemical like silver iodide into clouds. This offers a crystal around which condensation of moisture can take place. The moisture is there in the clouds, but this chemical makes rain clouds more efficient.

Dynamic cloud seeding

This boosts vertical air currents, increasing more water to pass through the clouds, providing more rain. More crystals of ice are put to use in this method as compared to the static version of this method. This procedure is much-more intricate than static one due to the fact that it depends on a series of events functioning properly in different stages.

Hygroscopic cloud seeding

This process scatters salts through bursts in the lower portions of clouds. With the joining of water, salts grow. Hygroscopic cloud seeding has a lot of potential, but there is still a need of more research to be done in this regard.

Silver iodide, liquid propane, dry ice is used for this process. The use of hygroscopic materials for example table salt is getting popular after the positive research results.

There are negligible health and environmental impacts of the process of cloud seeding, as stated by many ecological researches. The noxiousness of silver iodide is not that deadly. These findings result from the minute amounts of silver produced by cloud seeding, which are considerably below the industry emissions.

Seeping of the chemical into the soil, vegetation, and surface is also not exceeding the permissible limits. The countries making the use of this method employs this for maintaining a level of precipitation, high enough for supporting them.