A polar vortex collapse. Now, meteorologists are calling for another collapse in the middle of March, one that could plunge the U.S., Canada, and parts of Europe into a bitterly cold spell just days before the official arrival of spring.

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.

The SSW is linked to Polar Vortex Collapse - and is the rare system that was responsible for the Beast from the East in 2018. Seven years ago an SSW created weather that left the UK snowed in for days in the middle of March.

Reports of an impending polar vortex collapse are circulating online, with some forecasts claiming that Arctic air could plunge into North America and extend winter well into March. But according to Environment Canada, those forecasts don’t hold up — at least not for Ottawa.

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,