Wind, storms and cyclones ppt

3
Wind, storms and cyclones ppt
Thunderstorms and cyclones
Thunderstorms develop in hot, humid
tropical areas like India very frequently.
The rising temperatures produce strong
upward rising winds. These winds carry
water droplets upwards, where they
freeze, and fall down again. The swift
movement of the falling water droplets
along with the rising air create lightning
and sound. It is this event that we call a
thunderstorm.
Wind, storms and cyclones ppt
Wind, storms and cyclones ppt
Precautions against lighting storms
1. Do not take shelter under an
isolated tree. If you are in a forest
take shelter under a small tree. Do
not lie on the ground.
2. Do not take shelter under an
umbrella with a metallic end.
3. Do not sit near a window. Open
garages, storage sheds, metal
sheds are not safe places to take
shelter.
4. A car or a bus is a safe place to
take shelter.
5. If you are in water, get out and go
inside a building.
Structure of a cyclone
The centre of a cyclone is a calm area.
It is called the eye of the storm. A large
cyclone is a violently rotating mass of
air in the atmosphere, 10 to 15 km
high. The diameter of the eye varies
from 10 to 30 km .It is a
region free of clouds and has light
winds. Around this calm and clear eye
, there is a cloud region of
about 150 km in size. In this region
there are high-speed winds (150–250
km/h) and thick clouds with heavy
rain. Away from this region the wind
speed gradually decreases. The
formation of a cyclone is a very
complex process.
Wind, storms and cyclones ppt
How a thunderstorm become a cyclone
Cloud formation, water takes
up heat from the atmosphere to change
into vapour. When water vapour changes
back to liquid form as raindrops, this
heat is released to the atmosphere. The
heat released to the atmosphere warms
the air around. The air tends to rise and
causes a drop in pressure. More air
rushes to the centre of the storm. This
cycle is repeated. The chain of events
ends with the formation of a very
low-pressure system with very
high-speed winds revolving around it.
It is this weather condition that we call
a cyclone. Factors like wind speed,
wind direction, temperature and
humidity contribute to the development
of cyclones.
Destruction caused by cyclone
Cyclones can be very destructive.
Strong winds push water towards the
shore even if the storm is hundreds of
kilometres away. These are the first
indications of an approaching cyclone.
The water waves produced by the wind
are so powerful that a person cannot
overcome them.
The low pressure in the eye lifts
water surface in the centre. The rising
water may be as high as 3–12 metres
Fig. 8.11 Formation of a cyclone
(Fig. 8.13). It appears like a water-wall
moving towards the shore. As a result,
the seawater enters the low-lying coastal
areas, causing severe loss of life and
property. It also reduces the fertility of
the soil.
Continuous heavy rainfall may
further worsen the flood situation.
High-speed winds accompanying a
cyclone can damage houses, telephones
and other communication systems,
trees, etc., causing tremendous loss of
life and property.
Wind, storms and cyclones ppt
Cyclone
A cyclone is known by
different names in different
parts of the world. It is
called a ‘hurricane’ in the
American continent. In
Philippines and Japan it
is called a ‘typhoon’
Wind, storms and cyclones ppt
Tornadoes
Tornadoes: In our country
they are not very frequent. A
tornado is a dark funnel
shaped cloud that reaches
from the sky to the ground
Most of the
tornadoes are weak. A violent
tornado can travel at speeds
of about 300 km/h.
Tornadoes may form within
cyclones.
The whole coastline of
India is vulnerable to
cyclones, particularly the
east coast. The west coast of
India is less vulnerable to
cyclonic storms both in
terms of intensity and
Wind, storms and cyclones ppt
Action On The Part of People
We should not ignore the warnings
issued by the meteorological
department through TV, radio, or
newspapers. We should —
make necessary arrangements to
shift the essential household goods,
domestic animals and vehicles, etc.
to safer places;
avoid driving on roads through
standing water, as floods may have
damaged the roads; and
keep ready the phone numbers of all
emergency services like police, fire
brigade, and medical centres.
Anemometer
all storms are low-pressure
systems. Wind speed plays
an important role in the formation of
storms. It is, therefore, important to
measure the wind speed. The
instrument that measures the wind
speed is called an anemometer.
Wind, storms and cyclones ppt
1 de 19

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Wind, storms and cyclones ppt

  • 2. Thunderstorms and cyclones Thunderstorms develop in hot, humid tropical areas like India very frequently. The rising temperatures produce strong upward rising winds. These winds carry water droplets upwards, where they freeze, and fall down again. The swift movement of the falling water droplets along with the rising air create lightning and sound. It is this event that we call a thunderstorm.
  • 5. Precautions against lighting storms 1. Do not take shelter under an isolated tree. If you are in a forest take shelter under a small tree. Do not lie on the ground. 2. Do not take shelter under an umbrella with a metallic end. 3. Do not sit near a window. Open garages, storage sheds, metal sheds are not safe places to take shelter. 4. A car or a bus is a safe place to take shelter.
  • 6. 5. If you are in water, get out and go inside a building.
  • 7. Structure of a cyclone The centre of a cyclone is a calm area. It is called the eye of the storm. A large cyclone is a violently rotating mass of air in the atmosphere, 10 to 15 km high. The diameter of the eye varies from 10 to 30 km .It is a region free of clouds and has light winds. Around this calm and clear eye , there is a cloud region of about 150 km in size. In this region there are high-speed winds (150–250 km/h) and thick clouds with heavy rain. Away from this region the wind speed gradually decreases. The formation of a cyclone is a very complex process.
  • 9. How a thunderstorm become a cyclone Cloud formation, water takes up heat from the atmosphere to change into vapour. When water vapour changes back to liquid form as raindrops, this heat is released to the atmosphere. The heat released to the atmosphere warms the air around. The air tends to rise and causes a drop in pressure. More air rushes to the centre of the storm. This cycle is repeated. The chain of events ends with the formation of a very low-pressure system with very high-speed winds revolving around it. It is this weather condition that we call a cyclone. Factors like wind speed, wind direction, temperature and humidity contribute to the development of cyclones.
  • 10. Destruction caused by cyclone Cyclones can be very destructive. Strong winds push water towards the shore even if the storm is hundreds of kilometres away. These are the first indications of an approaching cyclone. The water waves produced by the wind are so powerful that a person cannot overcome them. The low pressure in the eye lifts water surface in the centre. The rising water may be as high as 3–12 metres Fig. 8.11 Formation of a cyclone (Fig. 8.13). It appears like a water-wall moving towards the shore. As a result, the seawater enters the low-lying coastal areas, causing severe loss of life and property. It also reduces the fertility of the soil.
  • 11. Continuous heavy rainfall may further worsen the flood situation. High-speed winds accompanying a cyclone can damage houses, telephones and other communication systems, trees, etc., causing tremendous loss of life and property.
  • 13. Cyclone A cyclone is known by different names in different parts of the world. It is called a ‘hurricane’ in the American continent. In Philippines and Japan it is called a ‘typhoon’
  • 15. Tornadoes Tornadoes: In our country they are not very frequent. A tornado is a dark funnel shaped cloud that reaches from the sky to the ground Most of the tornadoes are weak. A violent tornado can travel at speeds of about 300 km/h. Tornadoes may form within cyclones. The whole coastline of India is vulnerable to cyclones, particularly the east coast. The west coast of India is less vulnerable to cyclonic storms both in terms of intensity and
  • 17. Action On The Part of People We should not ignore the warnings issued by the meteorological department through TV, radio, or newspapers. We should — make necessary arrangements to shift the essential household goods, domestic animals and vehicles, etc. to safer places; avoid driving on roads through standing water, as floods may have damaged the roads; and keep ready the phone numbers of all emergency services like police, fire brigade, and medical centres.
  • 18. Anemometer all storms are low-pressure systems. Wind speed plays an important role in the formation of storms. It is, therefore, important to measure the wind speed. The instrument that measures the wind speed is called an anemometer.