Cyclones
- August 16, 2021
- Posted by: OptimizeIAS Team
- Category: DPN Topics
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Cyclones
Subject – Geography
Context – Nearly 6,800 people lost their lives in the country over the past three years due to hydrometeorological calamities such as flash floods, landslips and cyclones, and West Bengal has recorded the highest deaths among all States.
Concept –
- A tropical cyclone is an intense circular storm that originates over warm tropical oceans and is characterized by low atmospheric pressure, high winds, and heavy rain.
- A characteristic feature of tropical cyclones is the eye, a central region of clear skies, warm temperatures, and low atmospheric pressure.
- Storms of this type are called hurricanes in the North Atlantic and eastern Pacific and typhoons in South-East Asia and China. They are called tropical cyclones in the southwest Pacific and Indian Ocean region and Willy-willies in north-western
- Storms rotate counter-clockwise in the northern hemisphere and clockwise in the southern
- The conditions favourable for the formation and intensification of tropical storms are:
- Large sea surface with temperature higher than 27° C.
- Presence of the Coriolis force.
- Small variations in the vertical wind speed.
- A pre-existing weak low-pressure area or low-level-cyclonic circulation.
- Upper divergence above the sea level system.