The Philippines was hit by typhoon In-Fa and expected to make landfall in the eastern or northeastern coastal areas of China. Typhoon In-fa, known in the Philippines as Typhoon Fabian, is an active tropical cyclone in the East China Sea, threatening China.
- The storm has exacerbated and played a part in starting the 2021 Henan floods. Since 17 July 2021, China's Henan province has been affected by severe flooding, caused by a period of prolonged heavy rainfall.
- According to projections, In-fa would beat Typhoon Fitow of 2013 as the costliest typhoon to strike China, and the third costliest typhoon on record (a total of $14.7 billion) when adjusted for inflation.
What is Cyclone?
Cyclone is a storm where the low-pressure zone is surrounded by a high-pressure zone. Air moves inward from high to low-pressure zone and under the influence of Coriolis force whirls anticlockwise in Northern Hemisphere and clockwise in Southern Hemisphere.
* High-Pressure Zone: High-Pressure Zone is a region where the atmospheric pressure at the surface of the planet is higher than its surrounding environment.
* Low-Pressure Zone: Low-Pressure Zone is an area where the air pressure is lower than that of surrounding areas.
How a Cyclone is formed?
The formation of cyclones usually takes place in the low-pressure areas. These are formed over masses of warm water (like ocean, sea, etc.) near the equator. The rising of warm moist air begins the cyclonic process. When the warm air starts rising, the cooler air rushes in to fill the void left by the warm air. The warm, moist air cools as it rises higher into the air and forms clouds. As the process continues it begins to pick up speed and eye forms in the center. The eye is the lowest pressure spot in the storm (cyclone). This process is officially known as cyclone when wind speeds reach 74 mph.
When the cyclone hits the land, this process begins to slow due to the absence of warm air. However, this takes an extraordinary amount of time to dissipate completely.
Types of Cyclone
|Characteristic||Tropical Cyclone||Polar Cyclone||Mesocyclone|
|Region of Occurrence|
Tropical Cyclones and their Regional Names
Tropical Cyclones have a diameter of 100 to 500 kilometers. These are known by different names in different regions such as:
|Region of Occurrence|
|Velocity of Wind|
Willy-Willy: These are the tropical storm which originates in the coast of North-West Australia
*Anticyclones: These are high-pressure belt surrounded by the low-pressure belt. The wind blows outward in the clockwise direction in Southern Hemisphere.
Significance of Cyclones
- The Cyclones levels down the inequalities of pressure and wind movement over the globe.
- They play an important role in the complex process of heat exchange between various latitudinal zones.
- Cyclones have an effect over the phenomenon of precipitation, more so in the mid-latitude regions, by lifting up the moist air from oceans and carrying it into the surrounding landmasses.