30 Sep Oceanic warnings : Changing nature of Hurricanes
Details on topic “Oceanic warnings : Changing nature of Hurricanes”
Oceanic Pre: Indian and world physical –geography.
Mains: GS-I important geographical phenomenon
Why in headlines?
- Hurricane Ian, a tropical storm with heavy rain and winds of 73mph, recently hit the southern Eastern Seaboard of the United States.
- Scientists say that the storm is acquiring power rapidly and, if the latest history is any guide, it can intensify dangerously as it approaches Cuba
- These are kind of storms which carries a wind speed of 74 miles per hour spinning around them.
- They develop on the warm water near the equator and are one of the strong storms on the planet
- Large storms that occur over the Atlantic Ocean or the Eastern Pacific Ocean is often referred to as hurricane zone.
- They are also known by many different names
Typhoons: these are tropical cyclones that form in the China Sea and the Pacific Ocean.
Hurricanes are the Caribbean Sea and the Atlantic Ocean’s West Indian islands.
Tornadoes: Affects In West Africa’s Guinea region and the southern United States.
Willy-willies can be seen in north-western Australia and the Northern Territory.
Tropical cyclones generally occur in the Indian Ocean.
How do hurricanes form?
- In low-pressure Areas, when warm, wet air rises upwards from the surface of the ocean, it generates a low-pressure zone below.
- During this air form, the surrounding areas try the air from the surrounding areas and rush in to fill the space, ultimately rising as it warms and gets moist.
- In the middle of the cyclone, an eye forms: this is the most silent area of the cyclone. Before the wind reaches the centre, it warms up and climbs upward, and the moisture condenses as they warm up and climbs upward and the moisture condenses as the heated air rises and cools.
- This cloud and wind system continues to expand and spin.
- The hot temperature of the ocean and the water that evaporates from its surface fuel this disturbance, which causes storm systems to revolve faster and more rapidly.
- Storms that occur north of the equator rotate counter-clockwise, although those that form south of the equator revolve clockwise because of the earth’s rotation
- Hurricanes can last up to 14 in some areas.
Difference between Cyclone, typhoons and Tornado,
|Around a low-pressure area,
when there develops a rapid
inward air circulation, this circulation of air is called Cyclone
|These are full-grown tropical cyclones,
these matured cyclones usually
“Between 180° and 100°E”
in the Northern Hemisphere.
|Tornados are natural phenomena
which are consisting of a violently rotating
column of air that extends from a thunderstorm
to the ground.
|The air circulates in
clockwise direction in
southern hemisphere and in an anti-clockwise direction in
|This region is referred to as the Northwestern
Pacific Basin is the most active tropical
cyclone zone on Earth.
|They are whirlpools of rapidly moving air.
The tornado forms when there are changes
in wind speed and direction creating a
horizontal spinning effect within a storm cell..
|They come with violent
storms and bad weather.
|For organizational purposes, the northern
The Pacific Ocean is divided into three regions:
the eastern (North America to 140°W),
Central (140°W to 180°), and western
(180° to 100°E).
|This effect is then tipped vertically by rising
air moving up through the thunderclouds.
|Indian Ocean region affected by the cyclone:
Bangladesh, India, Maldives, Myanmar,
Oman, Pakistan, Sri Lanka and Thailand
|Tropical cyclones in the Pacific Ocean can affect
coastal regions of Mexico, south-east Asia,
north-east Australia and the South Pacific
|Tornadoes usually occur in middle latitudes..
They are usually referred to as twisters or
|The Indian Ocean can affect India,
Bangladesh, north-west Australia,
some parts of East Africa and
Indian Ocean islands such as
Mauritius and Madagascar.
|Tornados have been spotted on all continents
except for Antarctica
Changing the nature of hurricanes
They are becoming wetter, windier and stronger due to the effects of climate change.
In addition to it, it has been observed by scientists that it is influencing the storms to move slowly and letting them dump more water in one location
The earth is becoming hotter because of climate change but wasn’t for the oceans.
But, over the past 40 years, the ocean helped to reduce 90% of the warming brought on by the discharge of heat-trapping greenhouse gases.
The majority of oceanic heat is concentrated near the water surface.
In addition to it, the storms have the ability to produce more rainfall and can increase due to climate change.
A hotter environment can store more moisture, for which water vapour accumulates until clouds from raindrops are released, putting down the heavy rain.
Frequency of hurricanes:
The usually considered seasons of hurricanes are changing due to the change of climate since most of the time the years become storms friendly.
https://bit.ly/3SMY64q(the Indian Express )
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