Funnel shaped meteorological phenomenon accompanied by gusty rotating winds with dark cumulonimbus clouds and heavy thunderstorms is generally known as tropical cyclone. Geographically, they can only originate, as well as sustain in the tropical and subtropical oceanic regions. Here, I’m going to describe meaning and examples of tropical cyclone.
Meaning and explanation of tropical cyclone
Tropical cyclone is the finest manifestation of land sea interaction by the means of atmospheric elements such as winds, heat, water vapour etc.
As a meaning, “It is a meteorological system of rotating gusty winds around low pressure accompanied by huge cumulonimbus clouds and thunderstorms”.
“Major determinants of tropical cyclone”
In order to originate and develop a catastrophic cyclone, certain conditions are need to be fulfilled. These are,
Tropical and subtropical oceanic regions, more than 26 degree surface water temperature,
- Vast oceanic regions,
- Adequate relative humidity,
- Atmospheric instability,and
- Sufficient Coriolis force.
1. Tropical and subtropical oceanic regions
These regions have sufficient temperature and humidity to intensify the process of cyclogenesis.
Second, easterly winds are predominant in these regions. And, equatorial regions are devoid of Coriolis force and mid-latitude regions have opposite factors.
Hence, only tropical and subtropical oceanic regions are conductive to form such phenomenon.
2. Coriolis force effect
As I stated earlier that tropical cyclone is funnel shaped meteorological system. So, spinning force is indispensable to form such rotating structure. Coriolis force is absent in the equatorial region but enough in the tropical zones. As a result, it gives spinning momentum for high velocity winds entering in the low pressure area.
3. Large oceanic regions
Whenever such cyclones enter in the land, frictional force drastically reduces the force of winds. Consequently, the intensity of cyclones quickly decreases. For this reason, large oceanic regions are highly essential to maintain required intensity for rotating gusty winds.
4. Adequate humidity
High humidity plays an important role in the formation of convection currents and cumulonimbus clouds. Both act as a prerequisite conditions in the clouds formation and thunderstorms. And, we know that high humidity is the product of high temperature of vast oceanic surface in the tropical zones.
Examples of tropical cyclones
Cyclones in the tropical and subtropical oceanic regions are,
For better insight, mere meaning and examples of tropical cyclone is not enough. Therefore, proper understanding of determinants of tropical cyclone is equally important.