The theory is that unusual warming
of the Arctic has disrupted/ caused more fluctuations the earth’s
polar jet stream (a strong west to
east air current) —> disruption of the
stratospheric vortex (a counter-clockwise strong
air current in the Arctic the builds in the
winter) —> cold air trapped in the Arctic,
by the polar vortex, to spill south making
it colder in Chicago in the winter.
https://www.economist.com/the-economist-explains/2019/01/30/why-chicago-is-so-cold
Very possible.
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