PORTLAND, Oregon: A dangerous Arctic blast will continue sweeping across the US on Monday and linger through at least midweek, prolonging a bitter cold that set record-low temperatures in parts of the country and threatens to further disrupt daily life, including an NFL playoff game and the first-in-the-nation presidential nominating contest in Iowa.

The National Weather Service said wind chills are expected to push temperatures 30 degrees below zero from the Northern Rockies to northern Kansas and into Iowa, testing the hardiness of caucusgoers willing to brave the deep chill on Monday.