GK
INDIAN GEOGRAPHY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Western disturbances
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Dust storms
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Cyclones
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Tropical depressions
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Detailed explanation-1: -The amount and intensity of monsoon rainfall is determined by the frequency of tropical depressions. A tropical depression forms when a low pressure area is accompanied by thunderstorms that produce a circular wind flow with maximum sustained winds below 39 mph.
Detailed explanation-2: -The circulation index is estimated from the maximum vertical wind shear to define the monsoon intensity. It is calculated by the difference between zonal winds at the core heights of the LLJ in the lower troposphere and the TEJ in the upper troposphere.
Detailed explanation-3: -The difference in pressure over Tahiti (Pacific Ocean, 18 degree S/149 degree W) and Darwin in northern Australia (Indian Ocean, 12 degree 30’S/131 degree E) is computed to predict the intensity of the monsoons.