Kerala is currently experiencing record-breaking temperatures driven by a critical reduction in atmospheric airflow. High-pressure zones established over the Arabian Sea and the Bay of Bengal are effectively blocking the cooler sea breezes that typically reach the coast in the afternoons.
The Mechanics of the Heatwave
Because these high-pressure zones prevent cooler air from entering, hot air is unable to rise and instead remains trapped just above the earth’s surface. This has essentially shut down the region’s natural cooling system.
The situation is worsened by high humidity and stagnant air, which obstruct the process of evaporative cooling. The human body struggles to evaporate sweat, making the perceived temperature feel 3 to 8 degrees Celsius hotter than the actual recorded temperature.
Nighttime Warmth and Environmental Stress
The heat persists long after sunset. Although buildings and roads release the heat they absorb during the day, the lack of wind keeps this warmth near the surface, raising nighttime temperatures by 2 to 5 degrees Celsius.
Further intensifying the crisis is the loss of moisture in the soil and a lack of pre-monsoon showers. Dry, hot winds crossing over the Western Ghats are contributing to the overall rise in temperature.
Urban Heat Islands in Kochi and Thiruvananthapuram
Cities are bearing the brunt of this weather pattern due to the “Urban Heat Island” phenomenon. In Kochi and Thiruvananthapuram, concrete structures trap hot air, preventing it from escaping.
Wind speeds in these urban centers have plummeted to just 2–4 kilometers per hour during the day, a significant drop from the usual 10–15 kilometers per hour. This stagnation concentrates heat within the city limits.
Looking Ahead
The current atmospheric conditions may only shift if the region receives adequate pre-monsoon rainfall. Such rain could potentially clear atmospheric dust and restore essential airflow, which may lead to a decrease in temperatures.
Frequently Asked Questions
Why does the heat feel worse than the actual temperature?
High humidity and a lack of airflow prevent the body’s natural evaporative cooling process (the evaporation of sweat), making it feel 3 to 8 degrees Celsius hotter than the actual temperature.
How are cities like Kochi and Thiruvananthapuram specifically affected?
These cities are experiencing the “Urban Heat Island” effect, where concrete buildings trap heat. Daytime wind speeds have dropped from a normal 10–15 km/h to just 2–4 km/h.
What is causing the lack of cooler breezes in Kerala?
High-pressure zones over the Arabian Sea and the Bay of Bengal are blocking the flow of cooler air from the sea to the land, trapping hot air near the surface.
How has the lack of nighttime cooling affected your daily routine?
