Toronto Culture on Instagram: "Canada and the northeastern U.S. are expected to face extreme mid-December cold, triggered by a polar vortex stretching event, according to MIT climatologist Judah Cohen. While the phrase “extreme cold on Earth” went viral, experts clarify it means colder than normal for the region, not colder than Siberia or Antarctica. Cold air from Siberia is expected to rush across the pole into Canada and the U.S., bringing frigid temperatures, frostbite risks, and a likely wh