Heavy snow and blizzard conditions are persisting across the East Coast, with 85 million people affected and up to 3ft (90 cm) of snow dumped in some places.
Here's what's happened so far:
At least 11 people have died, with emergencies declared in 11 states and 20 states affected.
All non-essential travel has been banned in New York, with transport suspended. Those driving non-essential vehicles risk being arrested.
In Washington all mass transit is to be closed until Monday.
Tens of thousands of people are without power across New Jersey, Virginia and North Carolina.
Motorists have been stranded for hours along pockets of the Pennsylvania Turnpike.
More than 5,500 flights to, from or within the US have been cancelled this weekend.
Cars completely covered by snow
BBC Radio 5 live has been asking people for their snowbound video stories.
Here's what they got - including a street in Washington where cars are completely buried.
The pause before the next blizzard
In some parts of DC, such as outside the US Capitol, the clear up was already under way earlier, before another blizzard struck.
Getty ImagesCopyright: Getty Images
AFPCopyright: AFP
The Capitol police needed assistanceImage caption: The Capitol police needed assistance
The National Weather Service defines a blizzard as a storm which contains large amounts of snow or blowing snow, with winds in excess of 35 mph (16km/h) and visibility of less than 1/4 mile for an extended period of time (at least 3 hours). The word used to refer to a cannon shot or a volley of musket fire, according to AccuWeather, but started to be used to describe snowstorms in the 1870s.
Pictures from the snow storm
Hundreds of people are sharing their pictures of #snowmageddon2016 online.
BBCCopyright: BBC
Two-year-old Angus Broad was nearly buried in Washington, standing 37 inches tallImage caption: Two-year-old Angus Broad was nearly buried in Washington, standing 37 inches tall
Richard GloverCopyright: Richard Glover
Richard Glover sent this image from Morgantown, West VirginiaImage caption: Richard Glover sent this image from Morgantown, West Virginia
University of Mary / @UMaryCopyright: University of Mary / @UMary
Students at University of Mary in North Dakota huddled together for a snow selfieImage caption: Students at University of Mary in North Dakota huddled together for a snow selfie
Snowfall totals so far
APCopyright: AP
Headstones are nearly covered by snow at Arlington National CemeteryImage caption: Headstones are nearly covered by snow at Arlington National Cemetery
Martinsburg, West Virginia: 31.9in (79cm)
Clarksburg, Maryland: 27.2in
Alexandria Virginia: 17in
Washington: 16in
Baltimore, Maryland: 16in
Charlottesville, Virginia: 14in
Hoboken, New Jersey: 12in
Brooklyn, New York: 8in
Source: National Weather Service as of 17:30 GMT
The city that never sleeps...
...is getting mighty drowsy
PACopyright: PA
All hands on deck in Times SquareImage caption: All hands on deck in Times Square
ReutersCopyright: Reuters
All roads, bridge and tunnels in the biggest US city are shutImage caption: All roads, bridge and tunnels in the biggest US city are shut
European Photopress AgencyCopyright: European Photopress Agency
The Lincoln Center in New York is blanketedImage caption: The Lincoln Center in New York is blanketed
After a lull in the early afternoon in Washington, the blizzard roared back with high winds and heavy snow. Here, a reporter for Buzzfeed filmed the scene in Washington's Adams Morgan neighborhood.
There have been reports of "thundersnow" in parts of the US. For those furrowing their brows in confusion, the meteorological phenomenon is basically the same as a thunderstorm, except that snow falls instead of rain. It occurs when the atmosphere is unstable and the layer of air closest to the ground is cold enough to create snow, but still warmer than the air above it.
The BBC's Laura Bicker, in Washington DC, reports on the storm sweeping the US.
Video content
Video caption: The BBC's Laura Bicker reports on the snowstorm sweeping the USThe BBC's Laura Bicker reports on the snowstorm sweeping the US
Flooding, not snow, in southern New Jersey
A full moon, high tide and the massive winter storm hitting the US east coast combined to cause significant flooding in southern New Jersey's seaside towns. Waves of 22ft (7m) and a storm surge of two to three feet were reported on Saturday morning.
Getty ImagesCopyright: Getty Images
Getty ImagesCopyright: Getty Images
Emergency vehicles not immue
Even a massive fire engine was no match for unploughed snow along 12th Street in northwest Washington on Saturday. At one point, the firemen used their axes as (ineffective) makeshift shovels. It took a few hours for the engine to get moving again.
Live Reporting
Tim Swift, Tom Geoghegan and Vanessa Barford
All times stated are UK
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gettyCopyright: getty - At least 11 people have died, with emergencies declared in 11 states and 20 states affected.
- All non-essential travel has been banned in New York, with transport suspended. Those driving non-essential vehicles risk being arrested.
- In Washington all mass transit is to be closed until Monday.
- Tens of thousands of people are without power across New Jersey, Virginia and North Carolina.
- Motorists have been stranded for hours along pockets of the Pennsylvania Turnpike.
- More than 5,500 flights to, from or within the US have been cancelled this weekend.
Getty ImagesCopyright: Getty Images 
AFPCopyright: AFP The Capitol police needed assistanceImage caption: The Capitol police needed assistance View more on twitterView more on twitter View more on twitterView more on twitter View more on twitterView more on twitter 
Getty ImagesCopyright: Getty Images 
Getty ImagesCopyright: Getty Images A man jumps on a snow board as snow falls in New York.Image caption: A man jumps on a snow board as snow falls in New York. 
Getty ImagesCopyright: Getty Images A couple go cross country skiing in Central Park.Image caption: A couple go cross country skiing in Central Park. 
Getty ImagesCopyright: Getty Images A woman carries a snowboard in DC.Image caption: A woman carries a snowboard in DC. View more on twitterView more on twitter View more on twitterView more on twitter View more on twitterView more on twitter 
Getty ImagesCopyright: Getty Images 
BBCCopyright: BBC Two-year-old Angus Broad was nearly buried in Washington, standing 37 inches tallImage caption: Two-year-old Angus Broad was nearly buried in Washington, standing 37 inches tall 
Richard GloverCopyright: Richard Glover Richard Glover sent this image from Morgantown, West VirginiaImage caption: Richard Glover sent this image from Morgantown, West Virginia 
University of Mary / @UMaryCopyright: University of Mary / @UMary Students at University of Mary in North Dakota huddled together for a snow selfieImage caption: Students at University of Mary in North Dakota huddled together for a snow selfie 
APCopyright: AP Headstones are nearly covered by snow at Arlington National CemeteryImage caption: Headstones are nearly covered by snow at Arlington National Cemetery - Martinsburg, West Virginia: 31.9in (79cm)
- Clarksburg, Maryland: 27.2in
- Alexandria Virginia: 17in
- Washington: 16in
- Baltimore, Maryland: 16in
- Charlottesville, Virginia: 14in
- Hoboken, New Jersey: 12in
- Brooklyn, New York: 8in
PACopyright: PA All hands on deck in Times SquareImage caption: All hands on deck in Times Square 
ReutersCopyright: Reuters All roads, bridge and tunnels in the biggest US city are shutImage caption: All roads, bridge and tunnels in the biggest US city are shut 
European Photopress AgencyCopyright: European Photopress Agency The Lincoln Center in New York is blanketedImage caption: The Lincoln Center in New York is blanketed View more on twitterView more on twitter View more on twitterView more on twitter Video caption: The BBC's Laura Bicker reports on the snowstorm sweeping the USThe BBC's Laura Bicker reports on the snowstorm sweeping the US 
Getty ImagesCopyright: Getty Images 
Getty ImagesCopyright: Getty Images 
BBCCopyright: BBC View more on twitterView more on twitter 
AFPCopyright: AFP
Latest PostBlizzard returns to Washington
And that's it from our live updates from the snowstorm in the US. Thanks for staying with us.
As we sign off, snow is falling again in the nation's capital, as you'll see from the 360 below tweeted by the BBC's Sarah Holmes.
What we know so far
Heavy snow and blizzard conditions are persisting across the East Coast, with 85 million people affected and up to 3ft (90 cm) of snow dumped in some places.
Here's what's happened so far:
Cars completely covered by snow
BBC Radio 5 live has been asking people for their snowbound video stories.
Here's what they got - including a street in Washington where cars are completely buried.
The pause before the next blizzard
In some parts of DC, such as outside the US Capitol, the clear up was already under way earlier, before another blizzard struck.
The political snowmen have arrrived
Sledging on the Rocky Steps
Sledgers have taken to the Rocky Steps outside the Philadelphia Museum of Art in Pennsylvania.
Hitting the slopes
For some skiing and snowboarding enthusiasts, the huge snow dump has proved too tempting to stay indoors.
Scenes from snowy Baltimore
What makes a blizzard a blizzard?
The National Weather Service defines a blizzard as a storm which contains large amounts of snow or blowing snow, with winds in excess of 35 mph (16km/h) and visibility of less than 1/4 mile for an extended period of time (at least 3 hours). The word used to refer to a cannon shot or a volley of musket fire, according to AccuWeather, but started to be used to describe snowstorms in the 1870s.
Pictures from the snow storm
Hundreds of people are sharing their pictures of #snowmageddon2016 online.
Snowfall totals so far
Source: National Weather Service as of 17:30 GMT
The city that never sleeps...
...is getting mighty drowsy
Even the Secret Service get stuck
The storm isn't over in Washington
After a lull in the early afternoon in Washington, the blizzard roared back with high winds and heavy snow. Here, a reporter for Buzzfeed filmed the scene in Washington's Adams Morgan neighborhood.
What is thundersnow?
There have been reports of "thundersnow" in parts of the US. For those furrowing their brows in confusion, the meteorological phenomenon is basically the same as a thunderstorm, except that snow falls instead of rain. It occurs when the atmosphere is unstable and the layer of air closest to the ground is cold enough to create snow, but still warmer than the air above it.
Read more here.
Washington ghost town
The BBC's Laura Bicker, in Washington DC, reports on the storm sweeping the US.
Video content
Flooding, not snow, in southern New Jersey
A full moon, high tide and the massive winter storm hitting the US east coast combined to cause significant flooding in southern New Jersey's seaside towns. Waves of 22ft (7m) and a storm surge of two to three feet were reported on Saturday morning.
Emergency vehicles not immue
Even a massive fire engine was no match for unploughed snow along 12th Street in northwest Washington on Saturday. At one point, the firemen used their axes as (ineffective) makeshift shovels. It took a few hours for the engine to get moving again.
Flights cancelled across the East coast
Broadway cancelled
They say the show must go on... but not this weekend.
All matinee and evening Broadway shows on Saturday have been cancelled.
Charlotte St. Martin, the president of The Broadway League, said "normal operations to resume for tomorrow's Sunday matinees".