explain effect of tropical cyclone
Answers
Answer:
Tropical cyclones are characterised by low atmospheric pressure, high winds and heavy rain. ... These strong winds may cause torrential rains and devastating phenomena known as the storm surge. Basically, it is an elevation of the sea surface that can reach 6 metres above normal levels.
Answer:
Explanation:
Tropical cyclones are characterised by low atmospheric pressure, high winds and heavy rain. In extreme condition, the winds may exceed 240 km per hour and gusts may surpass 320 km per hour. These strong winds may cause torrential rains and devastating phenomena known as the storm surge. Basically, it is an elevation of the sea surface that can reach 6 metres above normal levels. In tropical and subtropical areas of the world, such cyclones with a combination of high winds and water cause a serious hazard for coastal areas.
Depending upon the maximum sustained wind, tropical cyclones will be designated as follows:
- When the maximum sustained speed is less than 63 km/h it is known as a tropical depression.
When the maximum sustained speed is more than 63 km/h then it is known as a tropical storm. It is then also given a name.
Depending upon the basin, when the utmost sustained speed exceeds 116 km/h it is known as Hurricane, typhoon, severe tropical cyclone, severe storm or tropical cyclone.
In fact, the strength of the hurricane also varies from Category 1to 5 according to the Saffir-Simpson Hurricane Wind Scale in use in the Caribbean Sea, the Gulf of Mexico, the North Atlantic Ocean and therefore the eastern and central North Pacific Ocean.
- Category 1: Mentioned the Hurricane with the utmost sustained wind speeds of 119-153 km/h.
- Category 2: Mentioned the Hurricane with the utmost sustained wind speeds of 154-177 km/h.
- Category 3: Mentioned the Hurricane with the utmost sustained wind speeds of 178-209 km/h.
- Category 4: Mentioned the Hurricane with the utmost sustained wind speeds of 210-249 km/h.
- Category 5: Mentioned the Hurricane with the utmost sustained wind speeds exceeding 249 km/h.
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Impact of Tropical Cyclone
As discussed above the impact of a tropical cyclone and the expected damage not only depend upon wind speed but also on other factors including moving speed, duration of strong wind and accumulated rainfall during and after landfall, sudden change of moving direction and intensity, the structure like size and intensity of the tropical cyclone and also on the human response to tropical cyclone disasters.
In several ways directly or indirectly tropical cyclones affect health:
- It Increases the cases of drowning and other physical trauma.
- It also increases the danger of water and vector-borne infectious diseases.
- Increases psychological state effects that also related to emergency situations.
- Disrupt health systems, facilities and services. It also left communities without access to health care once they are needed most.
- Damages basic infrastructure including food and water supplies and safe shelter.
It is also said that the impact of tropical cyclone also depends upon the number of individuals living in low-lying coastal areas within the storm's direct path, the built environment like the design of the building and also on the sufficient time for warning and evacuation.
The risk of drowning and water or vector-borne diseases increases when tropical cyclones cause floods and sea surges. Flood water may contain sewage and chemicals, hide sharp objects that are made from metals or glass and electrical lines or host dangerous snakes or reptiles that may result into injuries, electrocution, bites and can also cause diseases. According to WHO, around 726 million people were affected due to storms worldwide between 1998-2017.
How tropical cyclone works?
Tropical cyclones winds swirl around a central region of low atmospheric pressure. The wind is caused due to the low-pressure core and by the rotation of Earth, which further deflects the path of the wind via a phenomenon known as the Coriolis force. In the Northern Hemisphere, tropical cyclone rotates in a counter-clockwise or cyclonic direction and in the Southern Hemisphere, it rotates in clockwise or anticyclonic direction.
Tropical cyclone wind field may be divided into three regions:
1. Ring-shaped outer region and an inner radius of about 30 to 50 km. In this region, the speed of the wind increases uniformly toward the centre.
2. At the second region that is the eyewall, wind speed attains their maximum value which is typically 15 to 30 Km from the centre of the storm.
3. Further, the eyewall, in turn, surrounds the interior region known as the eye where the speed of the wind decreases rapidly and the air often calm.
Do you know the difference between Tropical Cyclone and Extra-tropical Cyclone?