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Home Geography

Cyclone Nivar

November 25, 2020
in Geography
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Cyclone Nivar to the coasts of Tamil Nadu and Puducherry

About Cyclone Nivar

  • It is originated in the Bay of bengal
  • According to a recent update from the India Meteorological Department the cyclonic storm NIVAR over southwest Bay of Bengal has burgeoned into a ‘severe cyclonic storm’ and lay 370 km east southeast of Chennai and 310 km southeast of Puducherry
  • The cyclone is likely to intensify further into a ‘very severe cyclonic storm’ by noon and make landfall by late evening between the Tamil Nadu and Puducherry coasts, around Karaikal and Mamallapuram with a wind speed of 120-130 kmph gusting to 145 kmph.

What are tropical cyclones?

Tropical cyclones are one of nature’s most violent manifestations and potentially the deadliest of all meteorological phenomena. It is a unique combination of violent wind, heavy rainfall and mountainous waves in sea.

A Tropical cyclone is a non-frontal, synoptic-scale, low-pressure system over tropical or subtropical waters with persistent, organized convection and a closed cyclonic circulation.

IMD classification of cyclones:

Cyclones are classified on the basis of the wind speed.

  • The lowest official classification used in the North Indian Ocean is a Depression, which has a 3-minute sustained wind speed of between 20–31 mph (31–50km/h).
  • Deep Depression: If the depression intensifies further then it will become a Deep Depression, which has speeds of between 32–38 mph (51–62 km/h).
  • Cyclonic storm: If the Deep Depression develops gale force wind speeds of between 39–54 mph (63–88 km/h), it is called a Cyclonic storm and the Indian Meteorological Department (IMD) assigns a name to it.
  • Severe Cyclonic Storm: They have storm force wind speeds of between 55–72 mph (89–117 km/h).
  • Very Severe Cyclonic Storm: They have hurricane-force winds of 73–102 mph (118–165 km/h).
  • Extremely Severe Cyclonic Storm: They have hurricane-force winds of 104–137 mph (166–220 km/h).
  • Super Cyclonic Storm: The highest classification used in the North Indian Ocean which have hurricane-force winds of above 138 mph (221 km/h).
Source: The Hindu
Tags: PRELIMS

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