US braces for snow storms as 'polar vortex' blankets Midwest
Temperatures in the US are expected to plummet to record lows after a weekend of heavy snowfall across much of the Midwest.
The plunging temperatures result from the polar vortex, an anti-clockwise pool of cold, dense air.
Hazardous conditions in many states have led to cancelled flights and motorists are being warned against venturing out onto the roads.
Mike Wooldridge reports.
06 Jan 2014
- From the section US & Canada