The India Meteorological Department on Thursday said that the monsoon would make landfall in Maharashtra within the next 24 hours. Weather officials have forecast extreme rainfall in Mumbai between June 9 and 11.

The weather department predicted heavy rainfall for Ratnagiri, Sindhudurg, Thane, Mumbai, Raigad and Palghar districts on June 9, PTI reported.

“In view of intense rainfall forecast, people are advised to abstain from outdoor activities as much as possible during the period,” The Indian Express quoted a statement from the department as saying. “Mumbai’s local trains are likely to be affected.”

The meteorological department also forecast “heavy to very heavy” rain over Goa and Konkan region between June 7 and 12. “Weather systems will gradually extend over north Konkan, including Mumbai, from Friday onwards, and continue till June 12,” said the department’s (West Region) deputy director general KS Hosalikar.

The Centre warned that the heavy rain predicted by the IMD for India’s western coast this week may lead to “flash floods” and swelling of rivers originating in the Western Ghats. Water levels in river basins between Tapi and Tadri, Godavari, Krishna and Cauvery and their tributaries are likely to rise, the government said on Wednesday. Parts of Mumbai are also likely to be inundated, the Centre said.

On Wednesday, Pune received 19mm in pre-monsoon showers, The Times of India reported.

In April, the department had forecast a high probability of a normal monsoon this year. The department predicted 97% rainfall of long period average. It, however, added that the figure may vary by 5%. The forecast is for the period of June to September.