A powerful storm will hit the United States in the days leading up to Christmas with heavy snowfall and sub-zero temperatures, forecasters predict.

Authorities have warned that the bad weather will affect flights and many roads will remain blocked at a time when many people are heading home for the holidays.

The arctic cyclone that will pass over the country is expected to bring dangerous weather, according to meteorologists.

The worst situation will be in the states of Idaho, Montana and Wyoming, where there is a danger that people will remain stranded in their homes.

snow storm

forecasters