ARTIFICIAL RAINFALL

…..[cloud seeding]

BATCH NO. H-1

Prepared by…….

•Aditi Boraste.•Kalyani Borse.•Hemlata Hinde.•Tejasvini Bhamare.•Priyanka Baviskar.

INTRODUCTION

Artificial rainfall is also known as Cloud Seeding.

Cloud seeding is a weather modification system that aims to boost precipitation or rain by introducing condensation nuclei such as salt or dry ice.

Water and rain represent life of the Holy Spirit. Revival is sometimes referred to as the latter

rain experience.

1st Stage

The first stage is Agitation. That is using chemicals to stimulate the air mass upwind

of the target area to rise and form rain clouds. The chemicals used during this

stage are calcium chloride, calcium carbide, calcium oxide, a compound of salt and urea,

or a compound of urea and ammonium nitrate. These compounds are capable of absorbing water vapor from the air mass,

thus stimulating the condensation process.

2nd Stage

The second stage is called Building-up stage. Here the cloud mass is built up using

chemicals such as kitchen salt, the T.1 formula, urea, ammonium nitrate, dry ice, and occasionally also calcium chloride to increase nuclei which also increase the density of the

clouds.

3rd Stage

In the third stage of bombardment chemicals such as super-cool agents:

silver iodide and dry ice are used to reach the most unbalanced status which builds

up large beads of water (Nuclei) and makes them fall down as raindrops. The

process is called seeding.

ChemicalsChemicalsThe most common chemicals used The most common chemicals used

for cloud seeding include for cloud seeding include Silver Silver IodideIodide and and Dry ice (frozen carbon Dry ice (frozen carbon dioxide)dioxide). The expansion of liquid . The expansion of liquid propane into a gas has also been propane into a gas has also been used and can produce ice crystals used and can produce ice crystals

at warmer temperatures than at warmer temperatures than silver iodide. The use of silver iodide. The use of

hygroscopic materials, such as hygroscopic materials, such as salt, is increasing in popularity salt, is increasing in popularity

because of some promising because of some promising research results.research results.

In planning, every stage a high degree of expertise and

experience is required, in selecting the types and amounts

of chemicals to be used, while taking into consideration weather

conditions, topographical conditions, wind direction and

velocity as well as the location or delimitation of the area for

chemical seeding. Several other ideas are also involved in rain

making. Rockets containing rain-making chemicals can be fired into the clouds either from the

ground or from aircraft.

Requirements….

A jet of rain-making chemicals is shot from a highly pressurized canister directly into the cloud base, so as to coerce clouds which

normally hang above mountain tops to cluster up and rain on the mountain or their

slopes.

CHINA'S RAIN CANNON BLOG

THESE RADDARS KEEP UPTO DATE INFORMATION OF THE WEATHER CHANGES.

Disadvantages

[1] The Chemicals used in the production of artificial rain could affect climatic patterns, ecosystem, water sources and the soil.

[2] Once started this process is uncontrollable.

[3] Cloud Seeding causes Flood's, Hurricane's and Thunderstorm's which result's in loss of many lives.