Cyclones and Tropical Cyclone class 7 science

1
Cyclones and Tropical Cyclone How are cyclones
formed Causes and effects of cyclones

• Class 7 Science

2
How are cyclones formed Causes and effects of
cyclones

• What is a cyclone?
• A cyclone is a system of wind that moves rapidly
  inward with a low-pressure area in the middle. In
  meteorology, it refers to the large mass of air
  that surrounds a strong atmospheric center. The
  internal winds moving over an area of ??low
  pressure allow us to view the storm in a spiral
  shape. The large-scale (synoptic scale) polar
  vortex and extra-tropical cyclones are the
  largest low-pressure systems. The synchronous
  scale also includes tropical cyclones such as
  tropical cyclones and subtropical cyclones.

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How are cyclones formed Causes and effects of
cyclones

• How are cyclones formed?
• Tropical cyclones form only near the equator, in
  warm ocean waters. A cyclone is formed when warm,
  moist air near the oceans surface rises upward.
  When air rises away from the oceans surface, it
  generates a low-pressure zone beneath it. It
  causes air from higher-pressure places to travel
  towards the low-pressure area, warming the air
  and causing it to climb above.

4
How are cyclones formed Causes and effects of
cyclones

• What is a tropical cyclone?
• Tropical cyclones are familiar to most people
  because they occur in tropical oceans. Cyclones
  and tornadoes are actually tropical cyclones, but
  they have different names that indicate where the
  storm is occurring.
• Tropical cyclones only form in warm ocean waters
  near the equator. A hurricane forms when warm,
  humid air rises above the surface of the ocean.
  As the air rises above and above the ocean
  surface, it creates an area of ??low pressure.
  This causes air to move from areas of high
  pressure to areas of low pressure, causing the
  air to heat up and rise.

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How are cyclones formed Causes and effects of
cyclones

• When warm and humid air rises and cools, the
  water in the air turns into clouds. As ocean heat
  and water evaporate from the surface of the
  ocean, the entire system of clouds and winds
  rotates and rises. As the air system spins at
  increasing speed, an eye forms in the middle. The
  center of the storm is very calm and clear. The
  difference in temperature between the warm and
  rising atmosphere causes the air to rise up and
  become more energetic. When the wind speed is 39
  mph (63 km/h), it is called a tropical storm.
• When wind speeds reach 74 mph (119 km/h), the
  storm is officially called a tropical cyclone
  or hurricane. Every year 70 to 90 hurricane
  systems develop around the world. The Coriolis
  force causes air to spiral in a region of low
  pressure.
• Typically, cyclones occur in the Atlantic and
  Northeast Pacific, while they occur in the
  Northeast Pacific. We can define tropical
  cyclones on the basis of their wind rate.
  Cyclones are classified according to wind speed
  and the damage they cause.

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How are cyclones formed Causes and effects of
cyclones

• Category 1 Wind speed between 90 and 125 kmph,
  with some damage to buildings and trees.
• Category II Wind speed 125 to 164 kmph, habitat
  damage, significant crop, and forest damage.
• Category III Wind speed 165224 kmph, Structural
  damage to homes, extensive damage to plants and
  uprooted trees, repaired cars, building damage.
• Category IV Wind speed between 225 and 279
  kilometers per hour, with power outages and
  significant damage to cities and towns.
• Category V Wind speed greater than 280 kmph,
  with extensive damage.

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How are cyclones formed Causes and effects of
cyclones

• Polar Cyclone
• Cyclones are common in the polar regions of
  Greenland, Siberia, and Antarctica. Polar winds
  are heavier than tropical cyclones in winter. As
  you can see, these storm travelers love good
  weather! In areas of the field, they are not very
  common and occur only very rarely, which is why
  the damage they do is minimal.
• Mesocyclone
• The mesocyclone gradually moves into a vortex as
  part of the lightning cloud begins to spin. The
  center refers to the meso, which we can
  consider as the midpoint between one climatic
  form and another. All storms are thunderstorms,
  but not all parts of the thunderstorm are caused
  by cyclones.
• Part of that cloud turns into a storm, even if
  you cant actually see it happening, its an
  intermediate or meso step from a normal cloud
  to a dangerous spinning cloud moving to the
  ground.

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How are cyclones formed Causes and effects of
cyclones

• What are the causes and effects of cyclones?
• Tropical cyclones cause heavy rainfall and
  landslides. They cause serious damage to towns
  and villages. In addition, they destroy coastal
  companies such as shipyards and oil wells.
• When these storms blow in the distance, they
  cause great damage to human settlements.
• They destroy a lot of crops and a lot of forests.
• They disturb the entire civilian life, especially
  when they hit the power and telephone lines.
• These cyclones often cause tornadoes, which can
  lead toflooding.
• They cause great damage not only to property but
  also to the lives of the people. Civil
  institutions are being demolished

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How are cyclones formed Causes and effects of
cyclones

• What are the local names of cyclones?
• Typhoons China Sea
• Tropical Cyclones Indian Ocean
• Hurricanes -Caribbean Sea
• Tornadoes-USA
• Wily Willies Northern Australia
• Baguio- Philippines
• Taifu- Japan
• What are the Cyclone prone areas in India?
• India is prone to natural calamities like
  earthquakes, floods, droughts, cyclones and
  landslides. According to the Meteorological
  Department, there are 13 coastal states and Union
  Territories of India prone to cyclones. The four
  states at risk are West Bengal, Andhra Pradesh,
  Odisha, Tamil Nadu, and one union territory on
  the east coast, Pondicherry, and one on the west
  coast, Gujarat.

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How are cyclones formed Causes and effects of
cyclones

• What is the cyclone warning system in India?
• The Meteorological Department of India is the
  nodal agency in India responsible for weather
  monitoring, weather forecasting, and seismology.
  The Cyclone Warning Center (ACWC) predicts a
  storm area in the Bay of Bengal and the Cyclone
  Warning Center (CWC) in the Arabian Sea. The ACWC
  and CWC sent their reports to the coordinating
  center, National Cyclone Warning Center (NCWC).
• Every year, Cyclones transmit energy equivalent
  to several megatons of nuclear bombs from the
  ocean into the atmosphere. Every year 70 to 90
  hurricane systems develop around the world.
  Cyclonic systems do not develop in this region
  because the Coriolis force is low between
  latitudes 5degrees north and 5degress south at
  the equator.
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