“Last month, Siberia experienced record snowfall and the worst blizzard in a decade,”
says this article on USA Today.
“There is a theory about snow in Siberia during the month of October,” the article begins. “If there is a lot, it can mean a particularly wicked winter in the northeast United States.”
“Above-average snow cover in Siberia is believed to affect the now-famous polar vortex and send bitterly cold temperatures to the Northeast.”