Temperatures were expected to moderate across the eastern and midwest United States on Tuesday, after days of freezing weather from "the blizzard of the century" left at least 56 dead and caused Christmas travel chaos.
Blizzard conditions persisted in parts of the north-eastern US, the stubborn remnants of a sprawl of extreme weather that gripped the country over several days, causing widespread power outages, travel delays and deaths in nine states, according to official figures.
In New York state, authorities described ferocious conditions, particularly in Buffalo, with hours-long whiteouts, bodies being discovered in vehicles and under snow banks, and emergency personnel going "car to car" searching for survivors.
The perfect storm of fierce snow squalls, howling wind and sub-zero temperatures forced the cancelation of more than 15,000 US flights in recent days, including nearly 4,000 on Monday, according to tracking site.
Buffalo -- a city in Erie County that is no stranger to foul winter weather -- is the epicenter of the crisis, buried under staggering amounts of snow.
"Certainly it is the blizzard of the century," New York Governor Kathy Hochul told reporters, adding it was "way too early to say this is at its completion."
Hochul said some western New York towns got walloped with "30 to 40 inches of snow overnight."
Later Monday, Hochul spoke with President Joe Biden, who offered "the full force of the federal government" to support New York state, and said he and First Lady Jill Biden were praying for those who lost loved ones in the storm, according to a White House statement.
Biden also approved an emergency declaration for the state, the White House said.
The National Weather Service forecast up to 14 more inches of snow on Monday, in addition to the several feet that had already left the city buried, with officials struggling to get emergency services back online.
"Temperatures are expected to moderate across the Midwest and the East over the next few days ahead of this system," the NWS said in its latest advisory on Tuesday, but warned that "locally hazardous travel conditions" would persist.
Erie County executive Mark Poloncarz tweeted on Monday that the blizzard-related death toll had climbed to 27 across the county, including 14 people who were found outside and three who were discovered in a car.
Speaking at a press conference earlier in the day, Poloncarz said Erie's death toll would likely surpass that of Buffalo's infamous blizzard of 1977, when nearly 30 people died.
With more snow forecast and most of Buffalo "impassable," he joined Hochul in warning residents to bunker down and stay in place.