The Source: Who Issues Weather Alerts?
In India, the primary agency responsible for all things meteorology is the India Meteorological Department (IMD), which was established in 1875. It is the government body that monitors weather patterns, forecasts conditions, and issues warnings for events
like heavy rain, cyclones, and heatwaves. Its alerts are designed to give citizens and authorities advance notice to prepare for potential disruptions and dangers. For a commuter, these alerts are the most reliable source to understand how the day's weather might impact travel.
Green Alert: All Clear
A Green alert means "All is well." When you see this, you can expect normal weather conditions with no significant rainfall or disruptions predicted. For your commute, this is a green light. No special precautions are needed, and your travel plans should proceed without any weather-related hitches.
Yellow Alert: Be Aware
A Yellow alert is a call to "Be Aware." It signifies that weather conditions could worsen and serves as the first level of warning. This alert is typically issued for expected heavy rainfall between 64.5 mm and 115.5 mm. For a commuter, this means you should stay updated. While widespread chaos isn't expected, you might encounter minor traffic snarls, slippery roads, or waterlogging in some low-lying areas. It's wise to allow for extra travel time and carry a raincoat or umbrella.
Orange Alert: Be Prepared
An Orange alert means you must "Be Prepared." This is a serious warning for extremely bad weather that has the potential to disrupt daily life. It is issued when heavy to very heavy rainfall, between 115.6 mm and 204.4 mm, is anticipated. For commuters, an Orange alert is a strong signal to reconsider travel plans. Expect significant traffic congestion, road closures, and possible interruptions to power and public transport. The risk of flooding in vulnerable zones is high, and authorities advise preparing for disruptions. If you must travel, exercise extreme caution.
Red Alert: Take Action
A Red alert is the highest level of warning and means "Take Action." It is issued when extremely severe weather is imminent, posing a significant risk to life and property. This corresponds to expected rainfall exceeding 204.5 mm within a 24-hour period. When a Red alert is active, commuters should avoid all non-essential travel. Widespread flooding, major transport disruptions across road and rail, and significant damage to infrastructure are likely. Follow instructions from local authorities, which may include orders to stay indoors or even evacuate from high-risk areas.
Beyond Colours: Key Rainfall Terms
Beyond the colour codes, IMD alerts use specific terms to describe rainfall intensity over a 24-hour period. Understanding these can add another layer of clarity. "Heavy Rain" refers to rainfall between 64.5 mm and 115.5 mm. "Very Heavy Rain" indicates rainfall from 115.6 mm to 204.4 mm. Finally, "Extremely Heavy Rain" means the expected accumulation is over 204.5 mm. These figures directly correspond to the Yellow, Orange, and Red alert levels for rainfall.
Where to Find Official Alerts
To stay ahead of the weather, rely on official sources. The IMD disseminates information through its official website, mausam.imd.gov.in. For on-the-go updates, the 'Mausam' mobile app is the official tool from the department, providing forecasts, radar images, and warnings. You can also find alerts on the 'UMANG' and 'Meghdoot' apps. Many people can also register for SMS-based alerts directly from the IMD. These platforms provide the most accurate and timely information to help you make informed decisions about your commute.
