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Home Environment

Anti-hail gun of Himachal Pradesh

June 8, 2021
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Anti-hail gun of Himachal Pradesh
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The Himachal Pradesh government will test the usage of indigenously made “anti-hail guns” to aid horticulturists who suffer crop damage due to hailstorms.

About anti-hail gun

  • It is a machine which generates shock waves to disrupt the growth of hailstones in clouds.
  • The indigenous guns have been developed by IIT Bombay along with Dr Y S Parmar University of Horticulture and Forestry at Nauni (Solan).
  • This gun fixed structure somewhat resembling an inverted tower, several metres high, with a long and narrow cone opening towards the sky.
  • The gun is “fired” by feeding an explosive mixture of acetylene gas and air into its lower chamber, which releases a shock wave (waves which travel faster than the speed of sound, such as those produced by supersonic aircraft). 
  • These shock waves supposedly stop water droplets in clouds from turning into hailstones, so that they fall simply as raindrops.

How Hail is formed?

  • Hail is produced by cumulonimbus clouds, which are generally large and dark and may cause thunder and lightning. 
  • In such clouds, winds can blow up the water droplets to heights where they freeze into ice. 
  • The frozen droplets begin to fall but are soon pushed back up by the winds and more droplets freeze onto them, resulting in multiple layers of ice on the hailstones. 
  • This fall and rise is repeated several times, till the hailstones become too heavy and fall down.
  • It is this hail formation process that the shock waves from anti-hail guns try to disrupt in a radius of 500 metres, so that the water droplets fall down before they can be lifted by the updrafts. 
  • The machine is repeatedly fired every few seconds during an approaching thunderstorm.

Problem of hail in Himachal Pradesh

  • Hail Storms affect apples, pears, and other crops in Himachal’s fruit-growing region every summer from March to May, causing enormous losses to farmers.
  • For instance, in some hail-prone areas such as Narkanda and Theog, the entire apple crop in an orchard may sometimes get destroyed during such storms
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Source: Indian Express
Tags: PrelimsThe Indian Express

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