La Niña, cold dry air from Siberia and local physics contributed to Karnataka’s winter chill
GS3Economy · S&T · Environment · Security· Infrastructure (energy, ports, roads, railways)· Prelims·
Why in news
The IMD and Bangalore University Professor Kamsali Nagaraja attributed Karnataka's record-low winter temperatures to a combination of La Niña, Siberian High advection, and local radiative physics.
Background
The cold snap affected north interior Karnataka and Bengaluru, with Bengaluru recording its lowest airport temperature in years. The phenomenon involved cooler-than-average sea surface temperatures (La Niña) and southward migration of the Siberian High.
Facts for Prelims
- S&TLa Niña: Characterized by cooler-than-average sea surface temperatures in the eastern and central Pacific.
- S&TSiberian High: A high-pressure system that drives cold air flow southward into the Indian subcontinent during winter.
- FactBengaluru recorded its lowest airport temperature in years during the December 2025 cold snap.
For Mains
Q. Analyze how global climatic phenomena like La Niña and the Siberian High influence regional weather patterns and impact agricultural stability in Southern India.
Dimensions to cover in your answer
- Atmospheric dynamics: Interaction between synoptic advection from Siberian High and local radiative physics
- Climate vulnerability: Impact of erratic winter temperature fluctuations on regional horticulture and urban infrastructure
Keywords: La Niña · Siberian High · Synoptic Advection · Radiative Physics · Climate Variability
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