Cloud seeding, sounds like manipulating nature in a good way to produce rain, it is useful in places that was affected by the el niño phenomena. Referring to the 1903, 1915, 1919 and 1944 and 1947 weather modification experiments, the Australian Federation of Meteorology discounted “rain making.” By the 1950s the CSIRO Division of Radiophysics switched to investigating the physics of clouds and had hoped by 1957 to better understand these processes. By the 1960s the dreams of weather making had faded only to be re-ignited post-corporatisation of the Snowy Mountains Scheme in order to achieve “above target” water. This would provide enhanced energy generation and profits to the public agencies who are the principal owners.
Cloud seeding has been shown to be effective in altering cloud structure and size and in converting supercooled liquid water to ice particles. The amount of precipitation due to seeding is difficult to quantify. Cloud seeding may also suppress precipitation.
A key challenge is in discerning how much precipitation would have occurred had clouds not been seeded. Overall, there is general expectation that winter cloud seeding over mountains will produce snow, expressed by professional organizations. There is statistical evidence for seasonal precipitation increases of about 10% with winter seeding. The World Meteorological Organization has indicated that cloud seeding produces positive results in many cases but is dependent on many factors such as specificity of clouds, wind speed and direction, and terrain.
The cloud seeding process is done by seeding some chemical to the clouds. Silver iodide and dry ice( frozen Carbon Dioxed) is one of the chemicals use in the proccess of cloud seeding . Expansion of liquid propane into a gas was also used in cloud seeding proccess it can produce iced crystals at warmer temperature than silver iodide. But from some country like the Philippines they uses salts in the cloud seeding proccess aircracft drops large amount of salts when cumulus clouds is present.
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