Current Affairs 31st August 2021

1. News : Hurricane Ida strikes U.S.

Source: The Hindu

  • Hurricane Ida after having gathered force on its approach through the warm waters of the Gulf has made landfall on the coast of Louisiana as a powerful Category 4 storm.
  • Hurricane Ida could be the most powerful storm to hit the state since 1850.
  • Hurricane:
    • Origin: Tropical cyclones or hurricanes use warm, moist air as fuel, and therefore form over warm Equatorial water.
  • Mechanism:
    • Low-Pressure Creation: 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.

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