(From The Guardian)
The sort of severe winter weather that has rattled parts of the US and UK is becoming more common as the Arctic warms, with scientists finding a strong link between high temperatures near the pole and unusually heavy snowfall and frigid weather further south.
A sharp increase in temperatures across the Arctic since the early 1990s has coincided with an uptick in abnormally cold snaps in winter, particularly in the eastern US, according to new research that analyzed temperature data from 1950 onwards.
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.