Geography • Physical GeographyMedium
Which specific atmospheric process governs the development of the localized pre-monsoon convective thunderstorms known as Mango Showers or summer showers in Kerala during April and May?
A. Intense surface heating producing strong localized updrafts of moisture-laden air originating from the adjacent warm Arabian Sea✓ Correct Answer
B. Subsidence of cold polar air masses sweeping down directly across the peninsular plateau from the northern latitudes
C. Persistent cloud cover associated with long-wave radiation cooling over high-altitude mountain peaks during midnight hours
D. High-pressure anticyclonic stagnation trapping industrial aerosols and halting all vertical atmospheric mixing
💡 Solution & Explanation
Pre-monsoon thunderstorms in Kerala arise from intense land heating that creates local thermal lows, drawing moisture from the Arabian Sea and triggering convective cumulonimbus clouds. Polar air masses cannot penetrate peninsular India due to tropical latitudes and the Himalayan barrier. Nighttime mountain cooling produces katabatic drainage winds rather than violent convective downpours. Anticyclonic stagnation suppresses rainfall rather than initiating heavy seasonal thunderstorms. These April showers are locally termed Asanthi or pre-monsoon squalls.
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