Tropical cyclones:
A tropical cyclone is a rapidly rotating storm system characterized by a low-pressure center, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain.
It is known by different names in different parts of the world.
Tropical cyclones have a geographic origin. They form mostly over tropical seas .They are called cyclones as they have winds blowing counterclockwise in the northern hemisphere and clockwise in the southern hemisphere. The opposite direction of winds is due to the "coriolis effect"
Tropical cyclones typically form over large bodies of relatively warm water. They derive their energy through the evaporation of water from the ocean surface. This water vapour condenses as clouds and falls on Earth as rain when it gets saturated.
Cyclones generate high waves, storm surge and very strong winds. Coastal regions are particularly vulnerable to damage from a cyclone. Heavy rains cause flooding inland while storm surges can cause coastal flooding.
The effect of cyclones on human population is devastating. It has caused loss of life and property since time immemorial.
Tropical cyclones are areas of low pressure.The environment near the center of tropical cyclones is warmer than the surroundings and is called as "warm core". The near-surface wind field of a tropical cyclone is characterised by air rotating rapidly around a centre of circulation while also flowing radially inwards. As air flows radially inward, it begins to rotate cyclonically in order to conserve angular momentum. Towards the centre, the air begins to rise . Wind speeds are low at the centre and begin to increase rapidly moving outwards. The wind speeds decrease gradually with increasing radii.
There are six Regional Specialized Meteorological Centers (RSMCs) worldwide. These organizations are designated by the World Meteorological Organization and are responsible for tracking and issuing bulletins, warnings, and advisories about tropical cyclones in their designated areas of responsibility. In addition, there are six Tropical Cyclone Warning Centers (TCWCs) that provide information to smaller regions
Worldwide, tropical cyclone activity peaks in late summer, when the difference between temperatures aloft and sea surface temperatures is the greatest. However, each particular basin has its own seasonal patterns. On a worldwide scale, May is the least active month, while September is the most active month. November is the only month in which all the tropical cyclone basins are active.
Most tropical cyclones form in a worldwide band of thunderstorm activity near the equator
The 1990 Andhra Pradesh cyclone or the 1990 Machilipatnam Cyclone was the worst disaster to affect Southern India since the 1977 Andhra Pradesh cyclone. It was first noted as a depression on May 4, 1990. It rapidly intensified into a super cyclonic storm (IMD scale, code named BOB 01) on May 8th. It was given a "category 4" storm on the saffir-simpson scale. The highest wind speeds recorded were greater than 200 kmph.
The storm resulted in the death of nearly 1000 people, 1 lakh animals and estimated samage to crops exceeding 600 million USD.
Cyclonic Storm Nilam (IMD designation: BOB 02) was the deadliest tropical cyclone to directly affect South India since Cyclone Jal in 2010. Originating from an area of low pressure over the Bay of Bengal on October 28, the system began as a weak depression. northeast of Trincomalee, Sri Lanka. Over the following few days, the depression gradually intensified into a deep depression, and subsequently a Cyclonic Storm by October 30. It made landfall near Mahabalipuram on October 31 as a strong Cyclonic Storm with peak winds of 85 km/h. In Chennai's Marina Beach, strong winds pushed piles of sand ashore and seawater reached nearly a 100 m (330 ft) inland. Schools and colleges in the city remained closed for more than three days.
More than 3000 people were evacuated around Mahabalipuram in the wake of the storm. Schools and colleges in Chennai declared holidays until November 1 as 282 schools had been converted into relief centers. Government offices and private organisations closed their operations early to ease traffic congestion. Cyclone shelters had been arranged in Nagapattinam and Cuddalore districts. Mahabalipuram faced power outages and several trees were uprooted and huts were damaged. While damages to property were considerable, human casualties were very few
Search for tropical cyclones in google / wikipedia
List of cyclones in India (Phalin, etc)
Floods:
Droughts:
A tropical cyclone is a rapidly rotating storm system characterized by a low-pressure center, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain.
It is known by different names in different parts of the world.
Tropical cyclones have a geographic origin. They form mostly over tropical seas .They are called cyclones as they have winds blowing counterclockwise in the northern hemisphere and clockwise in the southern hemisphere. The opposite direction of winds is due to the "coriolis effect"
Tropical cyclones typically form over large bodies of relatively warm water. They derive their energy through the evaporation of water from the ocean surface. This water vapour condenses as clouds and falls on Earth as rain when it gets saturated.
Cyclones generate high waves, storm surge and very strong winds. Coastal regions are particularly vulnerable to damage from a cyclone. Heavy rains cause flooding inland while storm surges can cause coastal flooding.
The effect of cyclones on human population is devastating. It has caused loss of life and property since time immemorial.
Tropical cyclones are areas of low pressure.The environment near the center of tropical cyclones is warmer than the surroundings and is called as "warm core". The near-surface wind field of a tropical cyclone is characterised by air rotating rapidly around a centre of circulation while also flowing radially inwards. As air flows radially inward, it begins to rotate cyclonically in order to conserve angular momentum. Towards the centre, the air begins to rise . Wind speeds are low at the centre and begin to increase rapidly moving outwards. The wind speeds decrease gradually with increasing radii.
There are six Regional Specialized Meteorological Centers (RSMCs) worldwide. These organizations are designated by the World Meteorological Organization and are responsible for tracking and issuing bulletins, warnings, and advisories about tropical cyclones in their designated areas of responsibility. In addition, there are six Tropical Cyclone Warning Centers (TCWCs) that provide information to smaller regions
Worldwide, tropical cyclone activity peaks in late summer, when the difference between temperatures aloft and sea surface temperatures is the greatest. However, each particular basin has its own seasonal patterns. On a worldwide scale, May is the least active month, while September is the most active month. November is the only month in which all the tropical cyclone basins are active.
Most tropical cyclones form in a worldwide band of thunderstorm activity near the equator
The 1990 Andhra Pradesh cyclone or the 1990 Machilipatnam Cyclone was the worst disaster to affect Southern India since the 1977 Andhra Pradesh cyclone. It was first noted as a depression on May 4, 1990. It rapidly intensified into a super cyclonic storm (IMD scale, code named BOB 01) on May 8th. It was given a "category 4" storm on the saffir-simpson scale. The highest wind speeds recorded were greater than 200 kmph.
The storm resulted in the death of nearly 1000 people, 1 lakh animals and estimated samage to crops exceeding 600 million USD.
Cyclonic Storm Nilam (IMD designation: BOB 02) was the deadliest tropical cyclone to directly affect South India since Cyclone Jal in 2010. Originating from an area of low pressure over the Bay of Bengal on October 28, the system began as a weak depression. northeast of Trincomalee, Sri Lanka. Over the following few days, the depression gradually intensified into a deep depression, and subsequently a Cyclonic Storm by October 30. It made landfall near Mahabalipuram on October 31 as a strong Cyclonic Storm with peak winds of 85 km/h. In Chennai's Marina Beach, strong winds pushed piles of sand ashore and seawater reached nearly a 100 m (330 ft) inland. Schools and colleges in the city remained closed for more than three days.
More than 3000 people were evacuated around Mahabalipuram in the wake of the storm. Schools and colleges in Chennai declared holidays until November 1 as 282 schools had been converted into relief centers. Government offices and private organisations closed their operations early to ease traffic congestion. Cyclone shelters had been arranged in Nagapattinam and Cuddalore districts. Mahabalipuram faced power outages and several trees were uprooted and huts were damaged. While damages to property were considerable, human casualties were very few
Search for tropical cyclones in google / wikipedia
List of cyclones in India (Phalin, etc)
Floods:
Droughts:
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