MUMBAI: The IMD issued a red alert for Mumbai on Saturday, warning of extremely heavy rainfall across the city.As per precaution, all schools and colleges in Mumbai have been directed to remain closed for the afternoon session on July 4 to ensure the safety of students.The Brihanmumbai Municipal Corporation (BMC) has also appealed to residents to stay indoors and step out only if it is absolutely necessary.Earlier in the day, Mumbai recorded an average rainfall of 99 mm during the 24-hour period ending at 8 am. The eastern suburbs received 98 mm of rain, while the western suburbs recorded 94 mm.According to tidal forecasts, a high tide of 4.26 metres is expected at 2.50 pm on Saturday, followed by another high tide of 3.60 metres at 2.52 am on Sunday. Low tides are forecast at 8.56 pm on Saturday at 1.66 metres and 8.22 am on Sunday at 1.28 metres.The weather department has also forecast occasional gusty winds of 50-60 kmph and warned that intense rainfall is likely to continue under the red alert in force for the city.