Cold Wave

Facts for Prelims

Cold Wave

News: Delhi and other parts of northwest India have been currently reeling under a cold wave spell.

What is a Cold wave?
• In the plains, the Indian Meteorological Department (IMD) marks a cold wave in terms of minimum temperatures – When the minimum temperature is 4 degrees or less or When the minimum temperature is less than 10 degrees and 4.5 to 6.4 degrees below the normal. 

What are reasons behind recent Cold wave?
• Large-scale fog cover is preventing Sunlight from reaching the surface.
• Light winds and high moisture near the land surface have been contributing to the fog.
• While westerly and north-westerly winds of around 5 to 10 kmph in the afternoon have also been contributing to the dip in temperature.
• Absence of western disturbances over the region. Western disturbances are storms from the Mediterranean region, which are associated with a change in wind direction, bringing easterly winds to northwest India.

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