Presentation for clouds and rainfall

1. Clouds : The wonders of the sky.

2. What are clouds ?What are clouds ?
Clouds are simply the white cover which surrounds our
planet.

3. How are clouds formed?
All air contains water, but near the ground it is usually in the form of an
invisible gas called water vapor.
When warm air rises, it expands and cools. Cool air can't hold as much
water vapor as warm air, so some of the vapor condenses onto tiny
pieces of dust that are floating in the air and forms a tiny droplet
around each dust particle.
When billions of these droplets come together they become a visible
cloud.

4. 4. Stratus
3. Cirrus
2. Nimbus
1. Cumulus
Types of clouds
There are mainly four types of clouds

5. Cumulus clouds
Cumulus means “heap” or “pile” in Latin.
These clouds are white, puffy clouds that look like pieces of
floating cotton.
Cumulus clouds are often called "fair-weather clouds".
Colour: White/ Greyish
Shape: Cauliflower like
Height: Medium

6. Nimbus clouds
Nimbus means “cloud” or “rain storm” in Latin.
These are rain clouds.
They resemble the cumulus clouds but are dark and dense.
Colour: Dark grey / black
Shape: Rounded tops and flat base
Height : Low

7. Cirrus clouds
Cirrus means “ringlet” or “curl of hair” in Latin.
These are like fine thin strands.
They predict fair to pleasant weather.
Colour: White
Shape: Feathery
Height: High

8. Stratus clouds
Stratus means “spread out” in Latin.
These are flat, hazy sheets of clouds.
They are found in layers and are know as fog if found very
low.
Colour: White / Greyish
Shape: Thin sheet like
Height: Medium / low

9. Rain : Nature’s shower on Earth.

10. What is rain?
Rain is simply the fall of water in the form of drops
from clouds.

11. How does it rains ?
When there is continuous condensation of water vapour in the air, it
results in the formation of minute droplets of water.
When these droplets of water join together, they form bigger drops,
which become too heavy to float in clouds and begin to fall.
This falling of condensed water is called rainfall or precipitation.

12. Types of rainfall
1. Relief
2. Conventional
3. Frontal
There are three types of rainfall:

13. Relief rainfall
1. Warm moist air from the sea.
2. Forced to rise over the hills.
3. Air cools as it is forced to rise.
4. Condensation occurs.
5. Clouds form.
6. Results in rain.
7. Occurs in the state of Maharashtra and Meghalaya.

14. Conventional rainfall
1. The sun heats the ground which heats the air.
2. Warm air rises.
3. Air cools as it is forced to rise.
4. Condensation occurs.
5. Clouds form.
6. Results in rain.
7. Occurs in the states of
West Bengal, Orrisa and Tamil Nadu.

15. 1. Mass of warm air meets a mass of
colder air.
2. Lighter warm air rises over
heavier cold air.
3. Warm air cools.
4. Condensation occurs.
5. Clouds form.
6. Results in rain.
7. Occurs in the states of Himachal Pradesh and Punjab.
Frontal rainfall

16. Rain …a blessing or curse??

17. Thank you