What is Yellow Alert? Understanding Its Importance in Weather Warnings

The Yellow Alert in the context of weather is a critical aspect of the colour-coded warning system used by meteorological agencies, especially the India Meteorological Department (IMD). This alert is an early warning signal showing that severe weather conditions are to be expected and may affect day-to-day activities.

Understanding Yellow Alert

A Yellow Alert is raised when there is a forecast of severely bad weather that may persist for several days. It simply means that although the weather might not be immediately dangerous, it may deteriorate further and thus interfere with routine activities. The IMD classifies weather alerts into four different colours: Green, Yellow, Orange, and Red, which stand for different intensities and levels of urgency.

• Green (All is well): No advisory is issued; conditions are normal.
• Yellow (Be Aware): Indicates the likelihood of moderate rainfall and other adverse conditions that could disrupt local activities. This alert is particularly relevant during the monsoon season when heavy rains can lead to localized flooding or landslides.
• Orange (Be Prepared): This symbolises very heavy showers with potential damage. The scenario may involve the rainfall to reach more than 115 mm within 24 hours, resulting in road, rail, and even power breakdown.
• Red (Take Action): It is the strongest warning where extreme heavy rain, more than 204 mm is expected with danger to human life and property. Immediate actions have to be taken to prevent it.

Under Which Circumstances Is a Yellow Alert Issued?

The IMD issues a Yellow Alert based on certain meteorological conditions. It is usually issued when:

• Expected rainfall is between 64.5 mm and 115.5 mm in 24 hours.
• Conditions such as thunderstorms, high winds, or snowfall are expected that may interfere with normal activities but do not yet threaten life.
• There is a risk of localized flooding in low-lying areas or transport system disruptions because of bad weather.
• The warning is precautionary, urging people to keep themselves updated about the changing weather and to prepare for the potential impacts. For instance, when heavy rainfall occurs, local authorities may advise people not to travel unnecessarily or take precautions against possible flooding.

Implications of Yellow Alerts

A Yellow Alert is an important indicator of public safety and preparedness. It prompts individuals and communities to:

• Follow weather updates from credible sources.
• Prepare for possible disruptions in daily routines, such as school closures or delays in transportation services.
• Take necessary precautions at home and work, especially in areas prone to flooding or landslides.

Recently, the IMD issued Yellow Alerts in several states of India because of expected heavy rains related to seasonal changes or cyclonic activity. For instance, alerts were recently declared for areas where rainfall had been ongoing for several days, and local governments declared holidays for schools and advised people to take safety measures.

The Yellow Alert is significant in increasing public awareness and preparation for adverse weather conditions. The importance of this alert system is then taught so that people know better how to avoid the potential dangers these severe weather events come with.