Tropical Depression 21W over Northwest Pacific Ocean intensified to a tropical storm ‘Dianmu’, just before making landfall in Vietnam. The cyclone made landfall today early morning over Thua Thien Hua and Quang Ngai provinces. Storm packed with winds of about 80kmh has moved northwestward and moved with a speed of 20kmh.
Dianmu has since weakened in to a deep depression and is centered on the border line of Vietnam and Laos. The storm had a downpour in excess of 350mm in some areas accompanied with gale speed winds. The mountainous terrain of Vietnam and increased vertical wind shear diminished its intensity rapidly. This was the 6th storm to enter East Sea so far this year. The weather system will be downgraded to a depression shortly.
The track of the storm suggest to pass over Laos and Thailand. On 25thSep, the depression will weaken to a low pressure area moving across Myanmar, nearing Gulf of Martaban. The next day, on 26thSep, the tropical system will reduce to a cyclonic circulation and enter Northeast and adjoining East Central Bay of Bengal BoB).
It is expected to become a low pressure area the same day and head for Odisha coast. This low pressure will move across Odisha, Chhattisgarh, Madhya Pradesh, Maharashtra and Gujarat. The peripheral of the system will impact weather activity over Andhra Pradesh, Telangana, Uttar Pradesh, Delhi and Rajasthan between 26th and 30th September.
This weather system will be the last of this monsoon season’ ending 30thSep. Active monsoon conditions will prevail over eastern, central and western parts of the country till the last day of the month. Rains will continue even thereafter over North India, possibly beyond 1st week of October. Accordingly, the monsoon withdrawal is going to be withheld much beyond the scheduled departure.