Cyclones are variable winds. In low latitudes, an intense depression with low-pressure conditions develops, known as tropical cyclones. These last only for few days.
- Because of the Coriolis Effect, they blow in an anti-clockwise direction in the Northern Hemisphere and clockwise in the Southern Hemisphere.
- They are associated with turbulent weather, cloudy weather, strong winds, and intense rainfall.
- A Tornado is a tropical cyclone that occurs over land. It is a funnel-shaped cloud extending downwards from the base of the thunderstorms. They may travel at a high speed of 500–800 km per hour. They are generally experienced over tropical waters in North America.
- Hurricanes and typhoons are some other tropical cyclones.
- Temperate cyclones are active over mid-latitudinal regions between 35° and 65° latitude in both hemispheres.
- Anti-cyclones represent calm weather. Winds blow gently in the clockwise direction in the Northern Hemisphere and in the anti-clockwise direction in the Southern Hemisphere.
Differences between tropical cyclones and temperate cyclones
|Tropical Cyclones||Temperate Cyclones|
|They originate between 8° and 20°|
north and south of the oceans in the
|These are active over mid-latitudinal|
regions between 35° and 65° latitudes in
|These are produced and developed|
mainly over the sea.
|These are produced over both land and|
|These are limited to small areas and|
generally travel from east to west.
|They comparatively cover a large area and|
generally move from west to east.
|The wind is calm at the centre of tropical|
cyclones with no rainfall.
|The wind is strong and rainfall occurs at the|
centre of temperate cyclones.
Differences between cyclones and anti-cyclones
|It is a low-pressure system with surroundings of high pressure.||It is a high-pressure system with surroundings of low pressure|
|It blows anti-clockwise in the Northern Hemisphere.||It blows clockwise in the Northern|
|It blows clockwise in the Southern Hemisphere||It blows anti-clockwise in the Southern Hemisphere.|
|It is associated with cloudy skies, heavy rainfall with stormy winds.||It is associated with clear skies, mild winds, and dry conditions.|
|It can cause great damage to life and property if precautions are not taken.||The weather is settled and pleasant.|
Pressure belts and types of winds
The distribution of atmospheric pressure across the latitudes is known as the global horizontal distribution of pressure. Read more
Precipitation -Types and Causes
The water cycle includes the process of evaporation, condensation, and precipitation. The heat of the Sun evaporates the water resulting in the formation of water vapour. Read more
The blanket of air that surrounds the Earth is known as the atmosphere. It exists in several layers. The atmosphere is made of many gases and solid particles. Read more
What are Local Winds?
Local winds blow over a particular place over a certain period of time. These winds may be warm or cold depending on the area from which they blow.
What are Jet Streams?
Jet streams are winds that blow horizontally from west to east at a high speed near the tropopause and the stratosphere. These are high-speed winds that influence the weather and climatic conditions of the region over which they blow.