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Cyclones / Planetary Winds

Cyclones are any large system of winds that circulates about a centre of low atmospheric pressure in a counterclockwise direction north of the Equator and in a clockwise direction to the south. 

Cyclone

Cyclones are characterized by inward-spiraling winds that rotates about a zone of low pressure.

Q.Who are giving names to Cyclones?

Global bodies like World Meteorological Organisation (WMO), United Nations Economic and Social Commission for Asia and the Pacific (UNESCAP) give names to cyclones. Besides these, Regional Specialised Meteorological Centres((RSMC), as well as tropical cyclone warning centres, also prepare the names for cyclones.

The Indian Meteorological Department (IMD) is among six RSMC in the world that have been mandated to name tropical cyclones in the north Indian Ocean region.

The WMO and UNESCAP comprise India, Myanmar, Bangladesh, Sri Lanka, Thailand, Pakistan and Oman. In 2018, the WMO and UNESCAP included five more countries--Iran, Qatar, Saudi Arabia, United Arab Emirates and Yemen.

Q.Why Cyclones are Named?

The cyclones are named to make it easier for people to remember and identify the storms. By giving name, it is easy to create awareness and to send out alerts and avoid confusion among multiple cyclonic systems over a region.

What are Planetary Winds?

The winds developed between global pressure belts are known as Planetary Winds.

There are three types of planetary winds

  1. Trade Winds
  2. Westerlies &
  3. Polar Easterlies
Let us discuss one by one.

1.Trade Winds: The wind blows from sub-tropical high-pressure belts towards the equatorial low-pressure belts are known as trade winds.

Global pressure belts and planetary winds


2.Westerlies: Winds blow continuously from sub-tropical high-pressure belts to sub polar low-pressure belts are known as westerlies.

3.Polar Easterlies: The polar easterlies are cold winds that blow from polar high-pressure belts to sub polar low-pressure belts.
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