The Four Colours of Caution
During monsoon season, headlines are often filled with mentions of weather alerts. The IMD uses a simple four-colour system—Green, Yellow, Orange, and Red—to warn the public about the potential severity of weather events, from rain and thunderstorms to cyclones.
The goal is to translate complex meteorological data into straightforward advice that helps citizens and authorities prepare for what's coming. Understanding this palette is the first step to making an informed decision before you step out of the door.
Green Alert: No Advisory Needed
A Green alert means 'All is well'. For commuters, this signifies a normal day with no significant weather-related disruptions expected. You can proceed with your daily travel plans without any special precautions. However, during the monsoon, it is always wise to keep basic rain gear like an umbrella or a light raincoat handy, as weather conditions can sometimes change unexpectedly. A Green alert simply means no organised, widespread adverse weather is on the horizon.
Yellow Alert: Be Aware and Updated
A Yellow alert is a signal to 'Be Aware'. It suggests that weather conditions might worsen over the next few days and could cause some disruption to daily activities. For rainfall, a yellow alert is often issued when 'heavy' rainfall between 64.5 mm and 115.5 mm is expected in a 24-hour period. For a commuter, this is a heads-up. While widespread chaos is unlikely, you might face localised waterlogging in low-lying areas or minor traffic snarls. Before leaving home, it’s a good idea to check for real-time traffic updates and allow for some extra travel time.
Orange Alert: Be Prepared for Disruption
An Orange alert means 'Be Prepared'. This is a serious warning indicating that 'very heavy' rainfall is expected, typically ranging from 115.6 mm to 204.4 mm in 24 hours. The potential for disruption is high. Commuters should anticipate significant traffic congestion due to waterlogged streets, major delays in public transport like buses and local trains, and even the possibility of road closures. Authorities issue this alert to signal a high risk of flooding and power outages. If you see an Orange alert, seriously consider working from home if possible. If you must travel, check your route for flood-prone spots, ensure your phone is fully charged, and inform your workplace of potential delays.
Red Alert: Take Action to Stay Safe
A Red alert is the highest level of warning and means 'Take Action'. It is issued when 'extremely heavy' rainfall, exceeding 204.5 mm in 24 hours, is forecast. A Red alert signifies a significant threat to life and property. Widespread flooding, collapse of vulnerable structures, and major disruptions to power and communication are highly likely. For commuters, the message is unequivocal: avoid all non-essential travel. During a Red alert, your safety is the priority. Follow instructions from local disaster management authorities, which may include orders to stay indoors. Expect schools and offices to be closed and public transport to be severely crippled or suspended entirely.
Beyond Colours: A Commuter's Checklist
Regardless of the alert colour, being prepared is key to navigating the monsoon. Keep a 'monsoon kit' in your bag with a sturdy umbrella, waterproof pouches for electronics and documents, and a power bank. Wearing footwear with good grip can prevent slips on wet platforms and pavements. Before leaving, always check live traffic and public transport updates on reliable apps. Knowing alternative routes can save you hours of being stuck. If you rely on local trains, check platform-level updates and be wary of overcrowding, which becomes more dangerous in wet conditions. Finally, never walk or drive through waterlogged streets if you cannot see the surface; it could be hiding open manholes or deep potholes.
