Extreme cold winter weather is up to four times more likely when temperatures in the Arctic are unusually high, the study found. Researchers compared daily temperatures from across the Arctic region with something called the accumulated winter season severity index, which grades winter weather based on temperature, snow fall and snow depth, across 12 US cities. “There’s a remarkably strong correlation between a warm Arctic and cold winter weather further south,” said Judah Cohen, a climatologist at Atmospheric and Environmental Research. And now we’ve had a parade of powerful winter storms and the beast from the east. Sometimes it can stray further south, bringing cold Arctic air with it.

Source: The Guardian March 13, 2018 15:56 UTC