Mumbaikars, especially in the island city, woke up to very heavy rainfall on Sunday. From 8:30am to 11:30am, Colaba recorded 122mm and Santa Cruz 35mm, causing floods in several areas. Though it continued to rain thereafter, the intensity became a lot less, with Colaba recording 147.2mm from morning till evening. Santa Cruz recorded 115.4mm in the same period.
Rainfall intensity is likely to be more on Monday. The weather bureau has warned of very heavy to extremely heavy rainfall, accompanied by strong winds gusting up to 50kmph in the city and the suburbs. As per the bureau's glossary, 64.5-124mm rainfall is 'heavy', 124.5-244.5mm 'very heavy', and above 244.5mm 'extremely heavy'. Also, high tides up to 3.68 metres are to occur at 6.12pm. If high-intensity rainfall continues in the evening, people may get into trouble finding transport for heading home from work.
Taking note of the forecast, the BMC has issued a warning: "We appeal to citizens to leave home only after consulting various media on the amount of rainfall and waterlogging in their areas. Citizens should not leave home unless necessary." It has also cautioned people against venturing into sea.
Monday's rainfall was caused by two weather systems: an active offshore trough running from the Gujarat to the Kerala coast and an upper air cyclonic circulation over Gujarat. "Together, these systems are causing rainfall over the Konkan and Goa region, including Mumbai," said V K Rajeev, director of weather forecast, IMD, Mumbai.
Moreover, very strong south-westerly winds are blowing along the west coast. For Mumbai, this means heavy rainfall with strong gusts of wind.