Download - Tropicalcyclones
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CYCLONES
Presented byMashakgomo T.C
University of Johannesburg
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What is a Cyclone?
• Defined as a violent storm that is characterized by high winds which rotates at a calm center of low atmospheric pressure.
• The center has velocity of 50km an hour.
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How a cyclone is formed!!
• A cyclone is a storm that involves the movement of warm, high-pressure air and cooler, low-pressure air. This movement of air causes a rotation that picks up speed and creates a funnel.
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Diagram of a cyclone!!!
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Countries that are effected by Cyclones!!!
• The countries in the map
• which are filled with
• yellow color are mostly
• effected by Cyclones. That
• are Bangladesh, India, Thai
• land, Malaysia, Indonesia
• Sri lanka, and much more near
• to the Indian ocean.
•
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INDIAN CYCLONES
• The coastal areas are subjected to severe wind storms and cyclonic storms. • A full-grown cyclone is a violent whirl in the atmosphere 150 to 1000 km
across, 10 to 15 km high. • Gale winds of 150 to 250 kmph or more spiral around the center of very low
pressure area. • Torrential rains, occasional thunder and lightning flashes - join these under an
overcast black canopy. • Through these churned chaotic sea and atmosphere, the cyclone moves 300
to 500 km, in a day to hit or skirt along a coast, bringing with it storm surges as high as 3 to 12 metres, as if splashing a part of the sea sometimes up to 30 km inland leaving behind death and destructions.
• A storm surge is the sudden abnormal rise in the sea level caused by cyclone. • The sea water flows across the coast as well as inland and then recedes back
to the sea. • Great loss of life and property takes place in the process.
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Mid-latitude Storms
• Unlike mid latitude storms that derive their energy from the contrast between warm and cold air masses. Tropical Cyclones oceans as water evaporates from the ocean surface.
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Cyclones in Pakistan.!!
• Since Pakistan was created 2 cyclones have hit the sindh coast. The first was in August 1948 and the 2nd in May 1999. This cyclone was about 80 km east of Karachi . In Karachi some refugees’ tents were blown drown but there was no other damages.
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Photos of Cyclone!!!
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HURRICANESThe History, Structure, Development, and Destruction
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What is a hurricane?
Violent cyclonic storm that develops in the tropical region
Wind speeds are > 74 mph
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What causes the damage in a hurricane?
WindsFloodingStorm Surge
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Mrs. Parker’s
Old House
Final Water Level
Flooding of Tar River as result of
Hurricanes Dennis and Floyd
DocksideTar RiverEstates
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Rotation and Pressure
In which direction does a hurricane rotate?
Counterclockwise
Is the barometric pressure inside the hurricane high or low?
Low
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Difference between Cyclone and Hurricane!!!!!
• Hurricane: a violent wind which has a circular movement, especially found in the West Atlantic Ocean. A hurricane is actually a violent storm formed with water which causes heavy rains and fierce winds and they can cause flooding of streets and homes.
• Cyclone: a violent tropical storm or wind in which the air moves very fast in a circular direction. They can be formed over tropical water, bar the Southeast Pacific and the South Atlantic Oceans.
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prepared by CT.Lakshmanan 17
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Bibliography
• MaHmOoD aShFaQ
http://www.slideshare.net/mahmoodjan71?utm_campaign=profiletracking&utm_medium=sssite&utm_source=ssslideview
• Ashley Proctor, Samone Proctor, Chelsea Addison
http://www.slideshare.net/jmrosenb?utm_campaign=profiletracking&utm_medium=sssite&utm_source=ssslideview
• CT. Lakshmanan B.Arch., M.C.P.SRM School of Architecture, RM University
http://www.slideshare.net/ctlachu?utm_campaign=profiletracking&utm_medium=sssite&utm_source=ssslideview
• Chritiano Felix, http://www.slideshare.net/liano8?utm_campaign=profiletracking&utm_medium=sssite&utm_source=ssslideview