Factors assisting revival of Monsoon in India

Monsoon in India is not a uniform phenomenon and as reiterated by Skymet, it is inherited with a variety of phases ranging from active Monsoon to weak, lull, break and the like. The lean phase of Monsoon began before 8th of August and after a prolonged period of weak Monsoon conditions, it finally takes a break.

However, this abnormality in the Monsoon season will not last for long as any abnormal condition in the atmosphere has a tendency to get back to normal.

Break in Monsoon

In last few days, the Monsoon current remained weak for major part of the country and rain was confined to only few pockets. The national capital witnessed the last spell of rain on the 10th of August while Amritsar received just 9 mm of rain in last 10 days. Patiala did not receive any rain during this period. Keeping up to the features of ‘break in Monsoon’, Dehradun received two spells of torrential rain of 120 mm and 135 mm, on the 15th and 16th respectively.

Mid of August is most prone to ‘breaks’ and that too longer breaks. Break in Monsoon can be witnessed in July and end of August as well but for short durations. September is the withdrawal month, receiving only sporadic rain but no breaks as such. Therefore, this could be the last break of the Monsoon season.

In break Monsoon condition, rain does not decrease in totality but the pattern and intensity varies. Heavy showers remain confined to the foothills of Himalayas and Northeast India.

Revival of Monsoon

For Monsoon to revive during normal conditions, firstly, the Monsoon trough should get established or restored.

Monsoon is normally revived by the formation of a low pressure area or depression in north Bay of Bengal. This will initially pull down the eastern arm of the Monsoon trough. As the system moves inland, it will pull down the other end of the trough as well.

Though, Indian seas are not prone to cyclones during this season, typhoons building up in western Pacific Ocean travel across South China Sea to reach coastal parts of China and Vietnam.

Remnants of such typhoons enter Bay of Bengal as a weak low pressure area but become a depression soon. Present conditions indicate that revival is not likely for another week or so.

Picture courtesy- Deccan Chronicle

By: Skymetweather.com