The monsoon strengthened overnight on Friday in interior peninsula bringing heavy to very heavy rain to Rayalaseema and south interior Karnataka.
Triggering of a causative system in the form of a circulation over northwest Bay of Bengal occasioned the flare-up. The system has since persisted there.
CAUSATIVE SYSTEM
A counterpart circulation over southeast Arabian Sea too helped, but it has since moved away into east-central Arabian Sea off the Karnataka coast.
An India Meteorological Department (IMD) update said that the monsoon was active also over Himachal Pradesh, sub-Himalayan West Bengal, Sikkim, Arunachal Pradesh and Marathawada.
A short-term outlook valid until Monday said that thundershowers are likely at many places over Jharkhand and Odisha.
Isolated to scattered showers may break out over Madhya Pradesh and Chhattisgarh on Saturday before scaling up.
HEAVY RAIN
A few places over interior Maharashtra, east Gujarat, Andhra Pradesh, interior Karnataka and Tamil Nadu are also expected to come under varied wet spells.
A heavy rain warning is valid for next two days over the Jammu division, Himachal Pradesh, Uttarakhand, sub-Himalayan West Bengal, Sikkim, Assam and Meghalaya.
An extended outlook valid right until the month-end said that rains may occur at many places outside west Gujarat and southeast peninsula.
Meanwhile, Korean forecaster APCC (Asia Pacific Climate Centre) has September rains are likely to be normal to excess for south peninsular India.
SEPTEMBER SCENE
But the rest of the country (Central India, northwest India, east and northeast India) is likely to witness below normal to deficient rain during the month, last of the season.
Post this, October might witness deficient rain along the west coast and west Maharashtra. But the rains are likely to be near-normal for the rest of the south peninsula, the Korean agency said.
November projects normal to excess rainfall for the entire western half of country. Excess rains are forecast for parts of Gujarat, western parts of which are running a deficit.
Below normal rain is indicated for the east coast (Tamil Nadu, Andhra Pradesh and Odisha) and east-central India (parts of Andhra Pradesh, Orissa and Chhattisgarh).