Waiting for the storm, Pg6

Key Highlights:

• A severe pre-monsoon weather system struck Uttar Pradesh in late May, resulting in 111 deaths and 72 injuries across 26 districts by May 14.
• The storms included thunderstorms, dust storms, lightning, heavy rain, and thundersqualls, making them among the deadliest in recent years.
• The India Meteorological Department (IMD) issued thunderstorm and lightning alerts, and the Uttar Pradesh government sent over 34 crore red and orange alert messages.
• The intensity of the storm, with winds capable of uprooting trees, distinguished it from similar events since 2018.

Detailed Insights:

• The weather system was driven by a pre-monsoon convective system, further destabilized by a fresh western disturbance over the northwest.
• The effectiveness of the SACHET portal warnings is questionable regarding geographical precision, timely delivery, and actionable instructions.
• Uttar Pradesh is prone to such events due to its location in a convergence zone where hot, dry winds meet moisture-laden winds.
• The rapid lifting of convergent air masses over the Vindhya hills in Mirzapur and Sonbhadra contributes to thunderstorm formation.
• Structurally vulnerable rural and peri-urban households, along with improperly placed infrastructure, exacerbate the impact of these storms.
• The State government's awareness of potential damage is evident in its announcement of relief packages based on the type of farming and crop loss.

Key Concepts Involved:

• Pre-monsoon Convective System: A weather system characterized by thunderstorms and heavy rainfall occurring before the onset of the monsoon season.
• Western Disturbance: An extra-tropical weather phenomenon originating in the Mediterranean region that brings sudden rain and snow to the northwestern parts of the Indian subcontinent.
• Convergence Zone: A region where two or more air masses meet, resulting in rising air and the formation of clouds and precipitation.