IAS (Admin.) Mains Geography Physical Setting- India-Mechanism of Indian Monsoons and Rainfall Patterns Study Material (Page 9 of 21)

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Weather Prediction: Terms Used in IMD Forecast

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Terms Used in IMD Forecast

Rainfall Frequency Terms

Rainfall frequency terms used in forecast

Tablutation of: Terms, Definition
TermsDefinition
One or two spells of rain
  • In a 24 hours time, rainfall occurring with a frequency of 1 - 2 rain spells.

… (463 more equations) …

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Progress and Phases of Indian Monsoons: Onset of the Monsoon

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Monsoon in India is caused due to varied response of a tropical atmosphere to heating from the lower boundary, which can be either:

  • A heat low type circulation, with ascent over the zone of maximum heating restricted to the lowest 2 - 3 km.
  • Ascent throughout the troposphere resulting in ITCZ type of circulation.

The variation between these two types of responses causes several phenomenon:

  • Before the onset of the monsoon, the Indian monsoon zone is characterized by the presence of a heat low.
  • At the end of the onset phase, a tropical convergence zone is established over the region. This ITCZ type of ascent is responsible for monsoon.
  • However, such a convective circul…

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