A major winter storm is set to spread heavy snow and damaging ice across a large portion of the United States over the coming days. Dangerously cold temperatures will only worsen the storm and increase its danger.

A major storm barreling its way to Massachusetts has already begun to dump heavy snow in Northeast region of the country Sunday morning, and forecasters say it could bring up to 20 inches to the state.

A blockbuster storm system is headed to New England on Sunday that will blanket the region with double-digit jackpot snowfall of a foot to nearly 2 feet, the most significant winter storm the Boston area has seen in four years.