Weather

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Weather
By Sirhan
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What is Weather?

• Weather is the state of the atmosphere, to the
  degree that it is hot or cold, wet or dry, calm
  or stormy, clear or cloudy.
• Weather generally refers to day-to-day
  temperature and precipitation activity, whereas
  climate is the term for the statistics of
  atmospheric conditions over longer periods of
  time.

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Why Weather can be happen?

• Weather is driven by air pressure (temperature
  and moisture) differences between one place and
  another. These pressure and temperature
  differences can occur due to the sun angle at any
  particular spot, which varies by latitude from
  the tropics.

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Example Of Weather
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Clouds
What are the different types of clouds and how
are they formed?
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Types of Clouds

• Different types of clouds are formed at different
  heights in the atmosphere.
• The three main types of clouds are
• Cumulus clouds
• Stratus Clouds
• Cirrus Clouds

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Cumulonimbus

• Cumulonimbus clouds extend from a height 2000 m
  to 16 000 m in the atmosphere. When cumulus
  clouds turn dark grey, they are called
  cumulonimbus which can produce rain, hail or
  lightning.

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Cirrus

• Cirrus clouds are formed very high in the
  atmosphere at 8000 m. These clouds are wispy and
  light, and look like feathers in the sky.

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Nimbostratus Clouds

• Nimbostratus clouds are formed below a height of
  2400 m in the atmosphere. They bring long steady
  rain and resemble grey blankets stretched out in
  the sky.

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Cumulus

• Cumulus clouds are formed at about a height of
  2000 m in the atmosphere . Cumulus clouds are
  white and fluffy like cotton balls.

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Stratus

• Stratus clouds are formed below below a height
  2000 m in the atmosphere. Stratus clouds are
  flattened sheets of clouds that may stay over a
  certain location for some time. They cause
  overcast weather.

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Fog
What is a fog and how is it formed?
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Fog

• A fog is just like a low-lting cloud. It hovers
  just above the ground because it is formed when
  the ground is cold, such as in winter or at
  night. The water vapour in the air condenses into
  tiny droplets of water to form fog.

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Dew
What is dew and how is it formed?
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Dew

• Dew appears as drops of water on cold objects
  usually in the early morning or late evening. Dew
  is formed when water vapour in the air comes in
  contact with a cold object of a temperature at or
  below the dew point. The temperature at which
  droplets can form is called the dew point.
• The water vapour then condenses to form small
  droplets on the copld surface.

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Hail
What is hail and how is it formed?
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Hail

• Hail is a form of precipitation that falls from
  the sky as clumps of ice. Precipitation is
  produced when water vapour from the sky condenses
  and falls to the ground.

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Formation of Hail
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Wind
How is wind formed?
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Wind

• The movement of air causes wind.

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Formation of Wind
When Earth surface heated by the Sun, the air
above it is also heated up. The warm air expands
and rises into the upper atmosphere. In another
region, where the surface of Earth is cooler.
Cooler air from the region of higher pressure
rushes in to replace the warm air
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Effects of Wind on Living Things and The
environment

• On Animals, Man, Plants, and Environment

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Wind affects the activities of man, animals,
plants, and the environment. Man, other animals
and plants may use wind for their benefit but
sometimes , wind may have a negative effect on
the environment
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Man

• Man relies on wind for some recreational
  activities such as windsurfing and kite-flying.
  We rely on wind to generate electricity in wind
  power stations. However, strong wind may damage
  properties and effect aviation.

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Animals

• Some animals make use of the wind to smell their
  prey. The smell of their predators in the wind
  also helps warn some animals of any danger.

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Plants

• Some plants need the wind to disperse their
  seeds. However, strong winds may uproot trees.

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Environment

• Wind causes rocks to erode. Strong winds that
  carry heavy rain, such as tornadoes and
  hurricanes, can cause floods.