Decoding the Colour Codes
The IMD uses a four-colour system to communicate the severity of expected weather, making it easy to understand the potential risk at a glance. For commuters, these colours are direct signals for planning your travel. Green (No Warning): This means 'All
is well'. Weather conditions are clear, and no disruptions are expected. You can proceed with your daily commute as normal. Yellow (Watch/Be Aware): This is a heads-up. Bad weather is possible, and while widespread disruptions are not expected, you should stay updated. For a commuter, a Yellow alert suggests allowing for some extra travel time and keeping an eye on the forecast, as conditions might change. Orange (Alert/Be Prepared): This is a serious warning. Heavy to very heavy rainfall is likely, with a high potential for disruptions like traffic congestion, waterlogging, and transport delays. When you see an Orange alert, it's wise to consider starting your journey earlier, checking your route for known waterlogging spots, and preparing for significant delays. Red (Warning/Take Action): This is the highest level of alert and signifies a significant threat. Extremely heavy rainfall is expected, which can lead to severe flooding, major disruption of transport services, and risk to personal safety. A Red alert advises against all non-essential travel. If you must commute, verify that public transport is operational and be prepared for roads to be closed. If possible, working from home is the safest option.
Understanding Rainfall Intensity
Beyond the colours, the IMD also classifies rainfall by its intensity, measured in millimetres (mm) over a 24-hour period. While the numbers are technical, their implications are practical for anyone on the road. Light to Moderate Rain (2.5 mm to 64.4 mm): This is the kind of rain that is manageable for a typical commute. While you'll need an umbrella and may face slightly slower traffic, it is unlikely to cause major waterlogging or bring the city to a halt. Heavy Rain (64.5 mm to 115.5 mm): This amount of rain is often associated with a Yellow alert. It can lead to waterlogging on poorly drained roads and cause noticeable traffic snarls in problem areas. Very Heavy Rain (115.6 mm to 204.4 mm): This intensity, typically falling under an Orange alert, is when serious problems begin. It can overwhelm drainage systems, leading to significant flooding on major roads and underpasses, making many routes impassable for smaller vehicles. Extremely Heavy Rain (over 204.5 mm): Linked to a Red alert, this volume of rainfall poses a severe risk of widespread flooding. Travel becomes hazardous, with a high probability of entire areas being cut off. It is during these events that public transport often shuts down, and authorities advise citizens to stay put.
Putting It All into Action
Knowing what the alerts mean is the first step; using them to make informed decisions is what keeps you safe and on schedule. The most useful forecasts for commuters are the 'Nowcasts', which provide warnings for the immediate two to three hours. You can access these alerts through the official 'Mausam' app from the IMD, which can send location-based warnings directly to your phone. Combining this with real-time traffic apps can give you a powerful advantage. For example, if you receive an Orange alert Nowcast for your area, you can immediately check a traffic map to see if your primary route is already congested and switch to an alternative before you even leave.
Your Monsoon Commuting Checklist
Based on the IMD's warnings, here is a simple checklist to follow: Green Alert: Business as usual. No special precautions needed. Yellow Alert: Be vigilant. Leave 15-20 minutes earlier than usual. Check the 'Mausam' app before you leave for any updated Nowcasts. Keep a power bank handy in case of delays. Orange Alert: Be prepared for disruption. If possible, use public transport like the metro, which is less affected by waterlogging. If driving, stick to main roads and flyovers. Inform your workplace you may be delayed. Have an emergency kit in your vehicle. Red Alert: Take action by staying safe. Avoid travel unless absolutely essential. Confirm with transport authorities about service status before heading out. Prioritise safety over your schedule. If caught in your vehicle in rising water, abandon it for higher ground.
