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MJO arrives as Monsoon 2018 expedites

July 1, 2018 9:30 AM |

Weather in IndiaA lot has been discussed about MJO (Madden Julien Oscillation) ever since the onset of Monsoon in India. And why not, the weather phenomenon plays an important role in driving the Monsoon across the country.

The MJO is defined as an oceanic atmospheric phenomenon that impacts global weather patterns as it revolves around Earth. This feature in transitory in nature that travels across and in proximity of the Equator. MJO is a pulse of cloud and rains and has a cycle of about 30 to 60 days.


The system makes more sense to India when it is present in the Indian Ocean, particularly during Monsoon. Although the MJO is seen in other seasons as well, but its presence hold much more weightage during the four-month long season.

MJO is one of the important Monsoon drivers. In fact, its presence along with the other features such IOD (Indian Ocean Dipole).

The magnitude of the MJO is directly gauged from to its distance from the centre. The MJO has an inner and an outer circle. As long as it remains in the inner circle, its effect is less but when it comes out, it has the potential to affect weather patterns. As per weathermen, the longer the distance from the centre, bigger is the amplitude and better is the rain spread.

MJO & Monsoon 2018

After enhancing pre-Monsoon showers, MJO is now all set to enhance Monsoon rains. It has not been too long when MJO had last visited Indian Ocean in May and has now once again entered the Indian Sea. According to weathermen, it is most likely to stay put till July 10, with stronger amplitude in first week and thereafter gradual decline in the next week but would still remain favourable. Following image will help in understanding better:


Let us have a look at how MJO will make difference:

  • Cyclogenesis: It generates cyclogenesis in Indian Sea. During Monsoon, Bay of Bengal is already conducive for the formation of the systems but the presences of MJO makes it even more vulnerable for the formation weather systems.
  • Strengthening of Equatorial Flow: The equatorial flow decides the strength of Monsoon surge. As per weathermen, weaker the flow is, less would be the rain. However, return of MJO will now turn the table as it would help in growth as well as sustenance of equatorial flow.
  • Deepening or intensification of existing Monsoon systems: The presence of MJO in Indian Ocean helps in existing systems in getting more marked. The Monsoon systems tends to stay for a longer period and spread is also more.
  • Strengthening of Monsoon circulation: Arrival of MJO marks the strengthening of Monsoon circulation that would in turn improve the special distribution of rains.


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