Path map of in fa fabian

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.

Keypoints

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
Nature
Tropical cyclones are closed air circulation around a low-pressure center.
This wind movement is caused by atmospheric disturbances coupled with the earth’s ‘rotation.
Polar cyclones are also known as Arctic Cyclones.
These are large areas of low pressure and are usually 1,000 to 2,000 kilometers wide in which the air is moving in a spiral counterclockwise fashion in the northern hemisphere.
A mesocyclone is a vortex (spiral) of air within a convective storm (approximately 2 to 10 miles in diameter).
It is the air that rises and rotates around a vertical axis, normally in the same direction as low-pressure systems in a given region.
Region of Occurrence
It happens over tropical ocean regions and of two types- Hurricanes and typhoons.
Hurricanes are found in the Atlantic and Northeast Pacific region, whereas Typhoons are found in the Northwest Pacific region.
It usually occurs over Polar Regions of Siberia, Greenland, and Antarctica.
It is strong during the winter season.
These types of cyclones are followed by the rotating air inside the thunderstorm.
Mostly occur in the North American region.
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:

Characteristics Hurricanes Typhoons Cyclones Tornadoes
Region of Occurrence
These are tropical storms in the West Indies and the Gulf of Mexico which usually occur in August-September.
These may bring thunderstorms and torrential rain.
These are tropical storms in the China Sea along with China and Japan coast.
These are similar to Hurricanes of the USA which may bring thunderstorm and torrential rain.
These are tropical low-pressure system occurring at the Indian coast in Bay of Bengal and the Arabian Sea.
These also bring thunderstorm and rain.
These are also known as Twisters (mainly in the USA). These are very intense and occur in Mississippi Missouri basin in the USA.
These are accompanied by dark funnel-shaped clouds.
Velocity of Wind
Wind blows with 160 to 180 kmph
The wind blows with speed to 160 to 180 kmph.
These whirl with a wind speed of 280 to 300 mph.
Winds are very violent with a speed of 350 to 500 mph.
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.

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