US temperatures set to plummet to record lows
Parts of America and Canada are experiencing near record-breaking low temperatures from a severe winter storm that has claimed at least 16 lives.
Giant ice boulders found on Lake Michigan shore
Giant ice boulders have been formed along the shores of Lake Michigan, as freezing conditions in the US continues to impact the Midwest.
Footage of the ice boulders, which have formed in the freezing waters of Lake Michigan, was captured in Glen Arbor and shared on the town's local Facebook page.
The giant ice balls started as small chunks of ice, before growing layer by layer in sub zero water, with some locals claiming they are as big as 50cm in diameter.
The rare nationwide chill which has been caused by the so-called "polar vortex" - an Arctic low pressure system - is expected to keep a grip on much of the country for at least another day, with cutting winds and blizzards posing the most danger.
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Will we get America's Big Freeze and snow?
As much of the US experiences a dangerous and severe cold spell, does the UK have anything to worry about?
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Boiling water trick shows how cold it is in America
As the US battles sub-zero temperatures, ITV News Washington correspondent Robert Moore illustrates just how cold it is in Minnesota.
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'Polar vortex' due to hit midwest America
Leaders across America are urging residents to stay in their homes as "polar vortex" batters the east coast after snowstorm Hercules.