The National Weather Service is forecasting extremely low temperatures in many parts of the US overnight:
- -34 C in Minneapolis, Minnesota
- -24 C in Chicago, Illinois and Indianapolis, Indiana
- -31 C in Fargo, North Dakota
The lowest temperature reported in the lower 48 states on Sunday was -40 C in the towns of Babbitt and Embarrass in Minnesota.
As much of the US experiences a dangerous and severe cold spell, does the UK have anything to worry about?
As the US battles sub-zero temperatures, ITV News Washington correspondent Robert Moore illustrates just how cold it is in Minnesota.
Leaders across America are urging residents to stay in their homes as "polar vortex" batters the east coast after snowstorm Hercules.