A polar vortex is a large area of low pressure and cold air that surrounds both of the Earth's poles, leading to dangerously low temperatures as it weakens and expands.
The polar vortex can last anywhere from a week to over a month, and when it hits regions not used to such cold, it poses significant health risks.
The upcoming polar vortex will bring temperatures in NYC down to 41°F initially, but the real cold is expected to hit about a week later.
Health risks associated with a polar vortex include hypothermia and frostbite, especially for individuals unprepared for the sudden and severe weather changes.
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