The United States has been experiencing severe winter storms, which isa> likely to affect more than 60 million people in the country’s east. The ongoing cold spell, which may bring down the mercury to as low as -50C (-60F), is caused by the expansion of the polar vortex – an area of extremely cold, rotating air around the Arctic – southwards.
Sub-freezing temperatures can extend as far south as the Gulf Coast and Florida Peninsula in the US.
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