As winter storm Jonas entered its second day, it seemed that there was no slowing down for one of the biggest blizzards in US history.

Up to 85 million people lie in the storm's path, which spans the East Coast and Mid-Atlantic, affecting residents from New York to North Carolina.

The massive storm has brought several eastern cities to a standstill, effectively shutting down New York and Washington DC.

Official reports suggest that at least 18 people have been killed in weather-related incidents, while in the past 48 hours, 11 states have issued states of emergency.

By Saturday afternoon, New York had started enforcing a full travel ban.

"After 2:30pm [EST] and you're on the road, we will arrest you," James P O'Neill, the NYPD chief of department, said at a press conference.

However, despite strict warnings, government officials said that they were concerned by the number of people who continued to leave their homes.

"Stay home, shelter in a warm place and allow snow plough operators and emergency responders to have free passage and control of the road ways," Leif Dormsjo, the director of Washington DC's department of transportation, told Al Jazeera.

"Being outside in this weather is dangerous and life-threatening. You are putting yourself at risk, and operators of specialised equipment at risk. We really need to keep the roads clear of any private vehicles."

By late early evening, snow levels had reached up to 40 inches in Virginia, 38 inches in Maryland, 35 inches in Pennsylvania, with New Jersey, New York and Washington DC following closely behind.

READ MORE: Massive blizzard grinds eastern US to standstill

Airlines were also feeling the impact of the storm, with more than 10,100 flights cancelled between Friday and Sunday, according to airline tracker Flight Aware.

Speaking to Al Jazeera, Mary Flannery, a Philadelphia International Airport spokeswoman, said: "All of our airlines cancelled flights for today [Saturday]. We have our own employees and contractors working around the clock to clear the snow, to clear the runways, the taxi ways, the sidewalks and parking walks."

Although the airport hoped to resume flights as early as Sunday, Flannery insisted that this "will be among one of the deepest snowstorms we’ve ever seen".

The storm has also left thousands of residents without power. In North Carolina alone, 110,357 homes were without electricity by mid-afternoon Saturday. In New Jersey, where Governor Chris Christie declared a state of emergency on Friday evening, at least 40,000 households were without power.

'Absolute extremes'

Homeless shelters across the East Coast region struggled to cope on Saturday as they sought to provide refuge for those most vulnerable.

"It's times like these that we are being pushed to absolute extremes," said Deborah Chambers, of Central Union Mission, in DC - an NGO that runs an emergency shelter programme.

"We are locked down by this storm and reaching the limitation of our resources. We need blankets, food, shoes and coats to protect the most vulnerable … hopefully no one will lose their life," Chambers told Al Jazeera.

Emergency response teams feared that residents might be indirectly exposed to danger by the storm.

"The thing we worry about is those who have medical emergencies, home fires and carbon monoxide poisoning," Russ Paulsen, executive director of Community Preparedness and Resilience for the American Red Cross, told Al Jazeera.

"More people die from traffic accidents in storms than from direct effects of the storm itself."

As police and ambulance sirens were heard throughout Washington DC, residents of the city and across the coastal region feared another night of bitter and menacing cold.

"This storm is not done yet," Muriel Bowser, Washington DC's Mayor, told reporters on Saturday evening, "and it’s still very dangerous."