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Current Affairs

Ida hurricane

Date: 31 August 2021 Tags: Disaster & Disaster Management

Issue

Hurricane Ida has made its landfall in Louisiana, at approximately the same location where hurricane Katrina stuck in 2005.

 

Background

Hurricane Katrina was a super-cyclone that ravaged Gulf States of USA and destroyed properties and infrastructure.

 

Details

  • Katrina’s greatest challenge was the storm surge that resulted in flooding in interior whereas Ida will have wind, storm surge, and fresh water flooding damage.

  • Ida is also making its landfall on the same date on which Katrina made its landfall 16 years ago. It will be deriving its power from similar patch of deep warm water.

  • Ida however will be stronger than Katrina by a big margin. New Orleans and Baton Rouge will be the core areas of damage.

  • Ida is classified as Category 4 storm with 150 mph (241 kph) winds. It has the capacity to become the fifth Category 5 landfall on the continental US.

 

Potential damage

  • It is expected to hit crucial industrial areas of the south. They make up the key infrastructure regions of the US, having repercussions on economy.

  • The Mississippi river will be shut down for weeks due to the storm surge. This will prevent barges and other commercial traffic from operating.

 

Reasons for hurricanes

Climate change has been the major culprit for spewing newer hurricanes. Some of the hurricanes, such as Hanna, Sally, Teddy, Laura, Gamma and Delta all rapidly intensified.

 

Hurricanes

  • Tropical cyclones, also known as Hurricanes near Americas, are a rapidly rotating storm system characterized by a low-pressure center, strong winds and low level atmospheric circulation.

  • These natural phenomenons usually take place in tropical areas of the planet in seas and oceans having warm waters.

  • The wind system blows counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere. 

 

Conditions for hurricanes

  • Temperature should be above 27 degree Celsius.

  • There should be presence of Coriolis force.

  • Variations in vertical wind speed must be very low.

  • There must be divergence above sea level.

 

Cyclone eye

The wind system circulating at the centre of the system is known as cyclone eye. It is a low pressure area with calm weather.

 

Cyclone wall

The winds around the walls are very strong and they extend up to the troposphere. The region experiences heavy rainfall.