The MCGM (Municipal Corporation of Greater Mumbai) has created a Greater Mumbai Disaster Management Authority (GMDMA) which is doing wonderful work for the last several years.
Please visit their website at http://dm.mcgm.gov.in/ for resources on the following :
Live Updates on weather, rainfall, high-tides, diversion of traffic, rail schedules
Complete List – Ward-wise – on whom to contact in an emergency (including phone nos., mobile nos., email ids, etc.)
Training Programs on Disaster Preparedness and First Responders
Standard Operating Procedure Manual
Mock Drill procedure
And many more resources
They also have a mobile app – Disaster Management MCGM – https://goo.gl/omklFo which gives live updates on your mobile
Very useful resources by MCGM for unforeseen circumstances