Can satellites help predict droughts or floods?

In one line

The rule

Satellites are artificial objects placed in orbit around the Earth to collect and send information, including about weather, rainfall, and water bodies, which helps scientists predict droughts (long dry periods) and floods (too much water).

Let's understand it simply

Imagine you are standing on your terrace, looking at your whole village. You can see which fields are dry, which rivers are full, and where clouds are gathering. Now, imagine a giant camera floating high above the Earth, seeing not just your village, but the whole country. This is what a satellite does. It takes pictures and collects data about the land, water, and clouds. Scientists use this information to know if an area is getting too dry (drought) or if too much rain is coming (flood).

How it works

1. Satellites orbit the Earth: They move around the planet, watching everything below.
2. They take pictures and measure things: Like clouds, rainfall, river levels, and soil moisture (how wet the ground is).
3. They send this data to computers on Earth: Scientists get real-time (right now) updates.
4. Scientists study the data: They look for signs—like less rain or drying rivers for drought, or heavy clouds and rising rivers for floods.
5. Predictions are made: Warnings can be sent to farmers, cities, and villages so people can prepare.
6. Governments and agencies act: They use the warnings to save lives, crops, and property.

The story behind it

Before satellites, people only knew about droughts or floods when they happened. In the 1960s, the first weather satellites were launched. India started using satellites like INSAT and IRS for weather and water monitoring. A famous example is the Indian National Satellite System (INSAT), which helps predict weather and warn about disasters. One interesting fact: the first weather satellite, TIROS-1, was launched by the USA in 1960, and it sent back the first pictures of clouds from space!

Where you see it in real life

• Weather forecasts on TV or mobile: The daily weather report uses satellite data to tell you if rain is coming.
• Flood warnings in Assam or Bihar: Satellites track river levels and heavy rainfall, so people can be warned early.
• Drought alerts in Maharashtra: If satellites see less rain and dry soil, farmers are warned about possible drought.
• Cyclone tracking: Satellites watch for big storms over the sea and warn coastal areas.
• Checking water in reservoirs: Satellites can see if lakes and dams are drying up or overflowing.
• Disaster management: During the 2015 Chennai floods, satellite images helped rescue teams find flooded areas.

Why it matters

• Saves lives: Early warnings help people move to safe places before floods.
• Helps farmers: Knowing about drought or flood risk lets farmers plan their crops and save water.
• Protects food supply: Prevents crop loss by warning about bad weather.
• Supports government planning: Helps decide where to send water, food, or rescue teams.

Worked example

Let's see how satellites help predict a drought:

Given: Satellite data shows only 40 mm rain in June (normal is 120 mm), and soil moisture is low.
Step 1: Scientists compare current rain to normal rain.
Step 2: They see the area has much less rain than usual.
Step 3: Soil moisture data confirms the ground is dry.
Step 4: They predict a drought and send a warning.
Step 5: Farmers are advised to use less water and plant drought-resistant crops.

Common mistakes

• Thinking satellites only take pictures: They also measure temperature, rainfall, and water levels.
• Believing predictions are always perfect: Sometimes, weather changes suddenly, so predictions can be wrong.
• Forgetting satellites need ground data too: Local weather stations and people’s reports help make better predictions.
• Assuming only one satellite is enough: Many satellites work together for accurate information.

Remember it

Satellites are like eyes in the sky—they help us see trouble coming, like droughts and floods, before it happens.