The polar vortex has been becoming more weak and shifting the last few years due to glaciers melting, which has lead to longer, colder winters.
That way the vortex works is opposite of how it sounds. When the vortex is strong, less of the cold air moves south through North America and Europe. When it is strong, the cold air dips down and causes severe cold weather.
The weakening polar vortex mixed with the potential El Nina will cause even more colder temperatures and snowier conditions. Which kids may enjoy because that will equal more snow days for the schools.
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