AccuWeather long-range forecasters are warning that a significant shift in the weather pattern could bring a blast of frigid Arctic air to parts of the United States in the second half of March, potentially lingering into early April.

The polar vortex that has dealt the most brutal winter to much of the US in recent years is about to be broken down – but not before unleashing a late-season cold and the biggest yet. A stratospheric warming event has begun,

Winter weather lingers as a major shift in the weather pattern could have millions across the United States once again reaching for their winter coats later this month before milder springlike air arrives for good.

Winter isn't over just yet. A major shift in the weather pattern could have millions across the United States once again reaching for their winter coats later this month before milder springlike air arrives for good.