Decoding the IMD's Colour Palette
The IMD uses a four-colour-coded system to issue warnings for severe weather, making it easier for the public to understand the risk level. Green means 'No Warning,' indicating all is well and no adverse weather is expected. Yellow means 'Watch' or 'Be
Aware,' suggesting that conditions could worsen and you should stay updated. Orange is an 'Alert' to 'Be Prepared' for potentially disruptive weather. Finally, Red is a 'Warning' that means 'Take Action,' signaling a high likelihood of severe weather that could disrupt life and pose a risk to safety.
From 'Heavy' to 'Extremely Heavy' Rain
The terms used by the IMD correspond to specific measurements, giving a clearer picture of what to expect. A 'heavy rainfall' warning, often associated with a Yellow alert, refers to expected precipitation between 64.5 mm and 115.5 mm in a 24-hour period. 'Very heavy rainfall,' which may trigger an Orange alert, is classified as 115.6 mm to 204.4 mm. An 'extremely heavy rainfall' warning, linked to a Red alert, is issued when precipitation is expected to exceed 204.5 mm. This level of rain significantly increases the risk of widespread flooding and severe disruption.
Why 'Nowcast' Is a Commuter's Best Friend
While daily forecasts are useful, the most critical tool for an immediate commute decision is the IMD's 'Nowcast.' A Nowcast provides district-wise warnings for the next few hours (typically up to three). These are highly localised and timely alerts about developing thunderstorms, lightning, or intense spells of rain. Checking the Nowcast on the IMD's 'Mausam' app or website right before you leave home or the office can provide the most accurate, real-time information to help you decide whether to delay your travel, take an alternative route, or stay put.
If the Alert Is Yellow: Proceed with Caution
A Yellow alert is a call for vigilance. It signifies the possibility of moderate to heavy rain that could cause localized waterlogging and minor traffic snarls. When a Yellow alert is active, don't cancel your plans outright, but do take precautions. Leave a little earlier than usual, check your route for known waterlogging spots, and be prepared for slower-than-normal traffic. Ensure your phone is fully charged and consider carrying a power bank. It’s a day for being watchful, not for taking chances.
When It Turns Orange: Be Prepared to Change Plans
An Orange alert signals a higher probability of disruption. With heavy to very heavy rain expected, there is a significant risk of street flooding, major traffic congestion, and delays on public transport. This is the time to seriously evaluate if your travel is necessary. If you can work from home, it's a good day to do so. If you must commute, avoid low-lying areas and roads prone to flooding. Inform your family or colleagues about your travel plans and expected time of arrival. An Orange alert means you should be prepared for significant delays and potentially hazardous conditions.
A Red Alert Means Take Action (By Staying Put)
A Red alert is the most serious warning and indicates that extremely severe weather is imminent. The primary action to take is to protect yourself and your property, which usually means avoiding travel altogether. Under a Red alert, expect widespread waterlogging, failure of power and communication lines, and severe disruption to road and rail traffic. Local authorities may issue specific instructions, including evacuation from vulnerable areas. Unless you are an essential service provider or facing an emergency, the safest decision during a Red alert is to stay indoors.
Your Monsoon Commute Safety Checklist
If you absolutely must travel during heavy rain, preparation is key. Before leaving, check that your vehicle's tyres, brakes, and wipers are in good condition. For drivers, reduce your speed, maintain a much greater distance from the vehicle ahead, and use low-beam headlights for visibility. Avoid driving through standing water, as it can hide deep potholes or open manholes. For everyone, carry a waterproof bag or cover for your electronics, wear footwear with good grip, and have an umbrella or raincoat handy. Planning your journey and having the right gear can make a significant difference in your safety and comfort.
