CYCLONES

Presented byMashakgomo T.C

University of Johannesburg

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.

prepared by CT.Lakshmanan 2

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.

Diagram of a cyclone!!!

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.

•

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.

prepared by CT.Lakshmanan 6

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.

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.

prepared by CT.Lakshmanan 9

Photos of Cyclone!!!

HURRICANESThe History, Structure, Development, and Destruction

What is a hurricane?

Violent cyclonic storm that develops in the tropical region

Wind speeds are > 74 mph

What causes the damage in a hurricane?

WindsFloodingStorm Surge

Mrs. Parker’s

Old House

Final Water Level

Flooding of Tar River as result of

Hurricanes Dennis and Floyd

DocksideTar RiverEstates

Rotation and Pressure

In which direction does a hurricane rotate?

Counterclockwise

Is the barometric pressure inside the hurricane high or low?

Low

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.

prepared by CT.Lakshmanan 17

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