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Hurricane Ida

  • 30 Aug 2021
  • 3 min read

Why in News

Recently, Hurricane Ida made landfall in Louisiana, US. It is an extremely dangerous Category 4 storm and one of the most powerful storms ever to hit the US.

  • It will test the hundreds of miles of new levees that were built after the devastation of Hurricane Katrina (2005), which made landfall 16 years ago in the US.

Key Points

  • About: Hurricanes are the biggest and most violent storms on the planet.
    • Tropical cyclones or hurricanes use warm, moist air as fuel, and therefore form over warm Equatorial water.
  • Mechanism:
    • When the warm, moist air rises upward from the surface of the ocean, it creates an area of low air pressure below.
    • When this happens, the air from the surrounding areas rushes to fill this place, eventually rising when it becomes warm and moist too.
    • An eye forms in the centre. It is the calmest part of the cyclone. Before the wind reaches the centre it gets warmed up and rises upwards.
    • When the warm air rises and cools off, the moisture forms clouds. This system of clouds and winds continues to grow and spin.
    • This disturbance is fuelled by the ocean’s heat and the water that evaporates from its surface.
    • Such storm systems rotate faster and faster.
    • Storms that form towards the north of the equator rotate counterclockwise, while those that form to the south spin clockwise because of the rotation of the Earth.
  • Names in Different Regions of the World:
    • Typhoons: Tropical cyclones are known as Typhoons in the China Sea and Pacific Ocean.
    • Hurricanes: In the West Indian islands in the Caribbean Sea and Atlantic Ocean.
    • Willy-willies: In north-western Australia and
    • Tropical Cyclones: In the Indian Ocean Region.
  • Categorization of Hurricanes:
    • Hurricanes are categorized on the Saffir-Simpson Hurricane Wind Scale, which rates them on a scale of 1 to 5 based on wind speed.
    • Hurricanes that reach category three or higher are classified as major hurricanes.

Source: TH

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