Sudden Stratospheric Warming 

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• Southern India received excessively heavy rainfall (ten times the normal) in the beginning of 2021. 

• This winter rain, according to the scientists, is due to sudden stratospheric warming that occurred in the Arctic region. 

About Sudden Stratospheric Warming: 

• The Sudden Stratospheric Warming is an event where the polar stratospheric temperature increases up to fifty degrees Celsius. 

• It is preceded by a situation where the polar jet stream of westerly winds in the northern hemisphere is disturbed by natural weather patterns. This is usually addressed as the polar vortex.