Cyclone Phethai to make landfall in Andhra Pradesh today

Cyclone Phethai to make landfall in Andhra Pradesh today


Cyclone Phethai heading northward from the Bay of Bengal makes landfall in Andhra Pradesh


  • Cyclonic storm Phethai has made a landfall at Katrenikona in Andhra Pradesh’s East Godavari district.
  • This is the third cyclone to hit the state this year after Cyclone Daye and Cyclone Titli
  • Phethai is relatively less severe when compared to Titli that ravaged Srikakulam district in north coastal Andhra region

What is a cyclone?

  • A “Cyclone” is an intense vortex or a whirl in the atmosphere with very strong winds circulating around it in anti-clockwise direction in the Northern Hemisphere and in clockwise direction in the Southern Hemisphere.

Tropical Cyclones:

  • It is a system of low pressure occurring in tropical latitudes
  • The differential heating over land and sea probably causes a small area of low atmospheric pressure to develop.
  • Tropical cyclone activity is at its maximum in late summer and early autumn
  • Tropical cyclones follow a parabolic path; their axis being parallel to the isobars.


  • Cyclones are intense low pressure areas – from the centre of which pressure increases outwards
  • The amount of the pressure drop in the centre and the rate at which it increases outwards gives the intensity of the cyclones and the strength of winds.
  • Cyclones are of two types: Temperate cyclone and Tropical cyclone. Tropical Cyclones are among the most destructive phenomena.

Necessary Conditions for development of a tropical cyclone and Formation:

  • Continuous supply of abundant warm and moist air
  • Sea temperature in lower latitudes should be around 27°C
  • A distance from the Equator is necessary, so that it allows the Coriolis effect to deflect winds blowing toward the low pressure centre. They develop in inter-tropical convergence zone
  • Pre-existence of weak tropical disturbances
  • Presence of anticyclonic circulation at the height of 9 to 15km above the surface
  • Low vertical wind shear between the surface and the upper troposphere. Vertical wind shear is the magnitude of wind change with height.
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