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A powerful Arctic storm is sweeping across a large swathe of the US and Canada. Weather alerts stretch from coast to coast and reach as far south as the US-Mexico border and Florida. More than 200 million people are under weather warnings or advisories on one of the busiest travel days of the year.

OS's James Reynolds has been speaking to Katie Nickolaou, a meteorologist in Michigan in the US.

Photo shows: Clearing the snow in Chicago, Michigan. Credit: Getty Images