The polar vortex of ultra-cold air usually spins around the North Pole, but it sometimes plunges southward into the U.S., Europe and Asia. Studies show that a fast-warming Arctic is partly to blame ...
In the Chicago area, the National Weather Service was predicting lake effect snow leading to hazardous road conditions throughout the day on Monday, including during the morning and evening commute.
Road conditions are beginning to deteriorate in the central part of the country, with forecasts calling for harsh winter conditions to spread eastward in the coming days.