Daily Current Affairs for UPSC Civil Services Exam – 23 May 2021

In Today’s News:

  1. Cyclone Yaas
  2. Invasive Whiteflies

1. Cyclone Yaas

News Summary

Indian Meteorological Department has warned that cyclone Yaas in the Bay of Bengal may become a severe cyclonic storm and cross the Odisha, West Bengal Coasts on May 26.

Prelims GS – Geography

Tropical Cyclones:
  • A tropical cyclone is a rapidly rotating storm originating over tropical oceans from where it draws the energy to develop.
  • It has a low-pressure center and clouds spiraling towards the eyewall surrounding the “eye“, the central part of the system where the weather is normally calm and free of clouds.
  • Its diameter is typically around 200 to 500 km but can reach 1000 km.
  • A tropical cyclone brings very violent winds, torrential rain, high waves, and, in some cases, very destructive storm surges and coastal flooding.
  • The winds blow counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere.
  • Tropical cyclones above a certain strength are given names in the interests of public safety.
Tropical cyclone naming:
  • World Meteorological Organization(WMO) maintains rotating lists of names that are appropriate for each Tropical Cyclone basin.
  • If a cyclone is particularly deadly or costly, then its name is retired and replaced by another one.

Click here to know more about Tropical cyclones on the WMO website.

The onset of Monsoon:
  • The monsoon arrives at the southern tip of the Indian peninsula generally by the first week of June.
  • Subsequently, it proceeds into two – the Arabian Sea branch and the Bay of Bengal branch.
  • The Arabian Sea branch reaches Mumbai about ten days later on approximately the 10th of June.
  • The Bay of Bengal branch also advances rapidly and arrives in Assam in the first week of June.
  • The lofty mountains cause the monsoon winds to deflect towards the west over the Ganga plains.
  • By mid-June, the Arabian Sea branch of the monsoon arrives over Saurashtra-Kuchchh and the central part of the country.
  • The Arabian Sea and the Bay of Bengal branches of the monsoon merge over the northwestern part of the Ganga plains.
  • Delhi generally receives the monsoon showers from the Bay of Bengal branch by the end of June (the tentative date is the 29th of June).
  • By the first week of July, western Uttar Pradesh, Punjab, Haryana, and eastern Rajasthan experience the monsoon.
  • By mid-July, the monsoon reaches Himachal Pradesh and the rest of the country.

Courtesy: NCERT

2. Invasive Whiteflies

News Summary

Whiteflies have come to India and have become invasive. A study has been conducted and found the damage caused by this pest.

Prelims GS – Environment

Whiteflies in India:
  • Whiteflies are common invasive pests found on crops.
  • The first such instance of invasive whiteflies known as Aleurodicus dispersus was found in 1995 in Kerala.
  • Now, these invasive whiteflies are found in almost entire India except Jammu and Kashmir.
  • These species are native to the Caribbean islands or Central America.
  • Invasive whiteflies are spreading on many native plants due to their prolific breeding.
  • Insect predators, parasitoids, and entomopathogenic fungi (fungi that can kill insets) are being used to control the whiteflies as these whiteflies are difficult to control using synthetic insecticides.



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