Decoding the Colour Codes
The IMD uses a simple colour-coded system to communicate the severity of weather events. For a commuter, understanding these is the first step to a smarter journey. A 'Green' alert means no advisory is needed, so you can proceed as usual. A 'Yellow' alert means 'Be
Aware'. This indicates the possibility of heavy rain that could cause some travel disruptions like waterlogging in low-lying areas. It's a signal to allow for extra travel time. An 'Orange' alert means 'Be Prepared'. This is issued when heavy to very heavy rainfall is expected, which is likely to disrupt traffic, public transport, and even cause power outages. If you see an orange alert, it's wise to consider if your travel is essential. Finally, a 'Red' alert means 'Take Action'. This is the highest warning, issued for extremely heavy rainfall that poses a significant risk to life and property. Widespread flooding and major disruptions are highly likely, and authorities may advise people to stay indoors.
Understanding Rainfall Intensity
Beyond the colours, the IMD's terminology gives more specific details. The alerts are based on predicted rainfall accumulation over 24 hours. 'Heavy rain', often associated with a Yellow alert, is defined as 64.5 mm to 115.5 mm. An Orange alert typically corresponds to 'very heavy rain', which is between 115.6 mm and 204.4 mm. A Red alert is for 'extremely heavy rain', meaning more than 204.5 mm is expected. Knowing these figures helps contextualise the warnings. It's the difference between minor waterlogging on your route and conditions that could make roads completely impassable.
Your Digital Toolkit: Key IMD Apps
The most effective way to receive these alerts is directly on your phone. The IMD has several official apps designed for the public. The primary one is 'Mausam', available on both Android and iOS. This app provides location-specific weather forecasts, radar imagery, and warnings for over 450 cities. For commuters, its most valuable feature is the 'Nowcast'—a short-term forecast for the next few hours, which is critical for making immediate travel decisions. Another crucial app is 'Damini', which provides early warnings for lightning strikes within a 20-40 km radius. Finally, 'Meghdoot' is aimed more at farmers but can also provide useful district-level weather information. By enabling location access and notifications on these apps, you can receive timely and relevant alerts for your specific area.
From Alert to Action: A Commuter's Plan
Information is only useful when acted upon. Here’s how you can translate IMD alerts into a practical commuting plan. For a Yellow alert, leave 15-20 minutes earlier than usual, check traffic apps for waterlogged spots, and ensure your phone and a power bank are fully charged. For an Orange alert, seriously evaluate your need to travel. If you must go out, check public transport status, as services may be delayed or rerouted. Inform your workplace about potential delays and avoid basement parking. For a Red alert, the safest action is to avoid non-essential travel altogether. If working from home is an option, take it. Prioritise safety above all else. During any alert, drive slowly, maintain a safe distance from other vehicles, and never attempt to drive through heavily flooded roads.
