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Meandering Monsoon 2019 squeezes June rainfall

June 13, 2019 5:28 PM |

Monsoon In India

Southwest Monsoon hangs in for a four month long period, longest season among all, which also covers the entire country, being the only season to do so. The other specialty is that it takes 45 days to cover the journey and takes similar time during the time of withdrawal as well.

The normal onset date for Monsoon in the mainland is June 1, with its completion around June 15. By June 10, normally, entire South Peninsula and Northeast India, most parts of Maharashtra and West Bengal, some parts of Odisha and Bihar are covered.

Meanwhile, in another five days, Wast, Southeast, and Northeast and East are also covered receiving rains which means, 70 percent of the country gets covered. Rest one third of the country takes one month to cover. However, the actual travel of Monsoon rarely follows the time which is stipulated and keep on having variations in terms of pace, intensity and coverage. There are periods when Monsoon is stagnant, at times, lull, vigorous during the time of its advancement.

Monsoon has two arms Arabian Sea is the western arm and Bay of Bengal is the eastern arm. Monsoon advancement in the country takes places in three phases. Herein, during the first phase, Monsoon travels from South to North over Peninsular India, under the influence of the Arabian Sea branch and simultaneously Northeast India sees Monsoon arrival under the influence of the Bay of Bengal branch.

During the second phase, Monsoon moves from east to west, covering parts of Bihar, Jharkhand, West Bengal, Odisha, Chhattisgarh, most parts of Uttar Pradesh, under the Bay of Bengal branch. On the Arabian Sea side, parts of Gujarat and West Madhya Pradesh see Monsoon rains by June 15.

The portion which is left comes under the third phase where both branches act in tandem which is the maximum struggle period for the Monsoon currents.

There is a very big push is needed to reach the last post, which is Jaisalmer and Barmer because Monsoon systems that form in June and beginning of July do not reach right till the end. Secondly, active Western Disturbances pull the Monsoon current and bring in Monsoon air mass over the hills, and the plains including Punjab, Haryana and Delhi NCR.

There are times when a Cyclonic Circulation forms over Gujarat and Rajasthan, which is responsible for bring Monsoon over western parts of Rajasthan.

This time, we have seen an indifferent onset, and Monsoon continues to be delayed, sluggish and weak. Monsoon is confined to the western Ghats, and only 10 percent has been covered while it could have been by more than half making Monsoon highly deficient in terms of coverage. Currently also, Monsoon is currently deficient by 42 percent.

Cyclone Vayu has restricted the advancement and is likely to hang around for some time, over North Arabian Sea. Monsoon advancement may be seen in the coastal areas of West Coast around the weekend, interiors may still have to wait.

Image Credit: wikipedia

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