India, Jan. 25 -- A massive winter storm is tightening its grip across the United States, pushing millions of people into dangerous cold, heavy snowfall, and widespread travel chaos. The storm, which began late Friday, is spreading rapidly and now threatens more than 200 million residents, making it one of the most severe weather events of the season.

Meteorologists say the storm will move across large parts of the country, creating life-threatening conditions as temperatures plunge and winds intensify. Authorities have urged people to stay indoors and avoid unnecessary travel as conditions worsen.

The National Weather Service (NWS) has issued urgent warnings as the Arctic blast brings sub-zero temperatures and powerful wind chills. Off...