Why can rain be controlled on important days?

The solution of using chemicals to “sow rain” ensures that important moments are not affected by bad weather.

The device is emitting silver iodide to prevent rain. Photo: CNET .

Weather is a natural factor that is difficult to intervene. However, modern technology provides solutions to deal with it in certain areas and times. The most famous of these is preventing rain during important outdoor events.

This technique has been around since the 1940s. The company responsible for the treatment needs to disperse the clouds and make them turn into rain before their natural point of falling. The goal is to have rain appear at other places and times, without affecting important outdoor events.

In theory, tiny silver iodide particles would be introduced into the region where the cloud forms. They would then influence the condensation of water. The silver iodide would prompt it to freeze into snow or form large raindrops. This would cause rain or snow to appear before, or at a different point than, the main event. On the other hand, this would also “break up” the cloud, creating clear skies.

Silver iodide molecules interact with water, accelerating the condensation process into rain or snow. Photo: CNET.

The solution was used in Russia for its annual Victory Day celebrations. China used similar technology for the opening ceremony of the 2008 Olympics. A British company even attempted to sell rain-proofing services at outdoor weddings.

The principle of cloud seeding is the same, but there are many ways to apply it. According to The Independent , Russia uses planes to inject silver iodide into the atmosphere that needs to be modified. Meanwhile, China used cannons to shoot the compound into high-altitude clouds in 2008.

This also requires engineering and precise calculations. A key part of the project is weather forecast data. Knowing the direction and likelihood of cloud formation is key to controlling the weather.

British company Oliver's Travels offers rain protection services for certain locations in France, but only if booked up to three weeks before the wedding date. The company's team includes pilots and professional meteorologists.

Source: https://znews.vn/vi-sao-co-the-kiem-soat-mua-trong-nhung-ngay-quan-trong-post1581964.html