Cold air

• January polar vortex forecast warns of 2 Arctic blasts - A dramatic blast of cold air may be coming for the United States in late January, courtesy of the polar vortex. Here's what could happen.
• Arctic blast to bring multiple waves of dangerous cold to the Midwest and Northeast next week - A pair of potent cold fronts will plunge into the northern tier of the United States as 2025 ends and 2026 begins. Behind each front, temperatures will drop and the lake-effect snow machine will be flipped on.