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Tuesday, 4 August 2020

Variable winds

Variable winds
Variable winds are winds with entirely different characteristics formed during certain atmospheric situations. The direction and the extent of such winds
have a variable nature. Cyclones and anticyclones are variable winds.
Cyclones
The heating up of the atmospheric air of a region increasingly in relation to its
surrounding regions causes sudden pressure changes. This pressure difference creates cyclones.
Cyclones have low pressure at the central part and high pressure in the surrounding regions.
Cyclones are caused by the formation of low atmospheric pressure at the centre surrounded by high-pressure regions. Strong whirlwinds blow towards such low-pressure centres from the surrounding high-pressure areas. Due to Coriolis effect winds flow in the anti-clockwise direction in the Northern Hemisphere and in the Southern Hemisphere. Based on the climatic region of their formation, cyclones can be classified as tropical cyclones and temperate cyclone. Cyclones often cause extensive damage and destruction wherever they occur. 
You might have heard of the Ockhi - cyclonic winds that struck the coastlines of Kerala and Lakshadweep during November 2017. This was a tropical cyclone. Tropical cyclones are caused due to local pressure differences in the tropical oceans, especially the Indian ocean. Ockhi cyclones left the Indian coasts after wreaking havoc on life and property.

Anticyclones

Another type of variable wind that forms in the atmosphere is called anticyclone. Anti cyclones are a phenomenon where strong whirlwinds blow from the high-pressure centres to the surrounding low-pressure areas. Due to the Coriolis effect, the pattern of winds in anticyclones is clockwise in the Northern Hemisphere and anti-clockwise in the Southern Hemisphere.

📌Related Topics
👉 Mountain and valley breeze
👉 Land breeze and Sea breeze
👉 Periodic winds: Monsoon winds
👉 Permanent winds
👉 Atmospheric pressure and winds
👉 Weather and climate
👉 Global pressure belts
👉 Variations in atmospheric pressure
👉 The atmosphere 
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