An off shore trough is likely to form off East Coast, extending from Bangladesh to Andhra Pradesh. Embedded in this, a cyclonic circulation will form over Northwest Bay of Bengal on 15 th August.
This system will become more marked and also move inland .This may further travel deep over central parts and later northern parts of the country.
Hence increase in the rainfall along Maharashtra, Goa & Karnataka coast after Monday 15th/16th.
Mumbai will also see simultaneous increase.