Cloud Seeding

Cloud Seeding
  • Cloud seeding is a kind of weather modification technology to create artificial rainfall.
  • It works only when there are enough pre-existing clouds in the atmosphere.
  • Drones are charged into the clouds and cause an electric shock due to which they clump together and cause rainfall.
  • In this process either silver iodide, potassium iodide or dry ice (solid carbon dioxide) is dumped onto the clouds causing rainfall.
  • Cloud-seeding chemicals can be dispersed in clouds in two ways:
    • By Fly-through aircraft or
    • By Ground-based dispersion devices that use rockets or guns to fire canisters into the sky.


  • It improves a cloud’s ability to produce rain or snow, supplements the rainwater supply.
  • It cleans the atmosphere by introducing tiny ice nuclei into certain types of subfreezing clouds.
    • These nuclei provide a base for snowflakes to form.


  • So far, experts haven’t found any harmful effects of cloud seeding with silver iodide on the environment.
    • But Silver iodide can be toxic to aquatic life.
  • The concentration of silver in a storm from cloud seeding is far below the accepted limit of 50 micrograms per litre.

Cloud Seeding in India

  • In India, these operations were conducted during the years 1983, 1984–87,1993-94 by Tamil Nadu Govt due to severe drought.
  • In the years 2003 and 2004 Karnataka government initiated this technique.


  1. Wikipedia
  2. India Today

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