Understanding Cyclone - Gaja in Tamil Nadu - Seeker's Thoughts

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Understanding Cyclone - Gaja in Tamil Nadu

Introduction: - Cyclone Gaja in Tamil Nadu
Drastic tropical cyclone storm ‘Gaja’ brought the disaster in Tamil Nadu. The cyclone also left hundreds of cattle dead all over Tamil Nadu; numerous crops have been destroyed by the winds of the cyclone, causing irreparable loss of livelihood to the farmers. 

While no major health problems have been reported post storm, but for those presenting with injuries sustained while clearing the debris, the health department officials seemed on alert.

What are tropical cyclones?

Tropical cyclones, also called typhoon or hurricane, an intense circular storm that originates over warm tropical oceans and is characterized by low atmospheric pressure, high winds and heavy rain. Drawing energy from sea surface and maintaining its strength if it remains over warm water.
Tropical Cyclone- Shape 

A tropical cyclone is a rotating, organized system of clouds and thunderstorm. It rotates counter clockwise in the northern hemisphere. A tropical cyclone generates winds may exceed 119 km (74 miles) per hour and may surpass 320 km (200 miles) per hour. These strong winds come with heavy rain and devastating phenomenon known as the storm surge, and elevation of the sea surface that can reach 6 metered (20 feet) above normal levels. Such as combination of high winds and water makes cyclones a serious hazard for coastal areas in tropical and subtropical areas of the world. 

Types of Cyclones

Tropical depression: A tropical cyclone with maximum sustained winds of 38 mph.

Tropical storm: A tropical cyclone with maximum sustained winds of 39 to 73 mph.

Hurricane: A tropical cyclone with maximum sustained winds of 74 mph or higher. In the western north pacific, hurricanes are called typhoons; similar storms in the Indian Ocean and South Pacific Ocean are called cyclones.

Major hurricane: A tropical cyclone with maximum sustained winds of 111 mph or higher, corresponding to a category 3, 4 or 5 on the Saffir Simpson hurricane wind scale.

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What are polar cyclones?

Cyclones that occur in Polar Regions like Greenland, Siberia and Antarctica. Unlike tropical cyclones, polar cyclones are unusually stronger in winter months. These storms really do prefer the colder weather. They also occur in area that aren’t very populated, so any damage they do is usually minimum.


What are mesocyclones?

Mesocyclones occur when part of a thunderstorm cloud starts to spin, which may eventually lead to tornado. “Meso means middle”, the mid -point between one type of storm and the other. Tornadoes all come from thunderstorm clouds, but not all thunderstorm cloud make tornadoes. This type of cyclone can be devastating as the clouds are too dangerous as they spin and run along the ground.

Where and when it formed?

Every year during the late summer months (July-September in the Northern Hemisphere and January- march in the southern Hemisphere), cyclones strike regions as far apart as the Gulf Coast of North America. North-western Australia, and eastern India and Bangladesh.

Tropical cyclones are known by various names in different parts of the World. In the North Atlantic Ocean and eastern North Pacific, they are called Hurricanes, and in the western North Pacific around the Philippines, Japan and China the storms are referred to as typhoons. In the western South Pacific and Indian Ocean. They are variously referred to as severe tropical cyclones, tropical cyclones, or simply cyclones. All these different names refer to the same type storm.

Impact of Cyclones 

Cyclones are dangerous because they produce destructive winds, heavy rain full of flooding every year thousands of people died from such devastating events occurred in several part of the world. The property number of billions gets destroyed every year. Climate change is also a major reason of occurring such intensive cyclones.