A huge winter storm has brought heavy snowfall and freezing temperatures to the mid-west and east coast of the US
At least six people have reportedly died, including a man whose body was found outside of a bus shelter
More than 2,000 flights have been cancelled and another 23,000 delayed because of the heavy snowfall
As much as 18in (45cm) of snow has fallen in parts of Kansas, with large quantities recorded across multiple states
You can find the forecast for your area on BBC Weather
Snowstorm covers beaches and brings skiers to downtown DC
An update now on air travel in the US, with travellers already facing significant disruption as Storm Blair sweeps the country.
The total number of domestic, inbound and outbound flights delayed has now surpassed 3,300, while cancellations have topped 1,700.
Kansas City International Airport and St. Louis Lambert International Airport in Missouri continue to be the worst affected.
Watch: Snow blankets parts of New York and Nebraska
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The winter storm is forecast to continue causing disruption into Monday, specifically in the Mid Atlantic region.
In Pittsburgh, the National Weather Service (NWS) says that heavy snow is forecast before both the morning and evening commutes and warns of disruption.
A high rate of heavy snow will make it harder for ploughs to clear roads. the service says.
Image source, ReutersA car travels westbound in blizzard conditions on Interstate 70 in Topeka, Kansas
A blizzard warning has been issued for portions of central, south-central, south-west, and west-central Kansas due the severe weather.
The NWS has urged people to delay all travel due to the "treacherous and potentially life-threatening" conditions.
Visibility may drop below 0.25 miles (0.4km) due to falling and blowing snow, with "whiteout conditions" expected, it adds.
Gusts of up to 45mph (72 kmh) and an additional 2in (5cm) of snowfall are expected.
The alert is effective immediately and lasts until 18:00 local time on Sunday (00:00 GMT on Monday).
The NWS has shared a map of the areas covered by the warning., external
Highway Patrol Trooper Ben Gardener ventured out into the roads of Kansas to provide an update on the storm working its way across parts of the US.
He says motorists have been moving too fast, adding that the road is very "slick".
In a warning to residents, he says they should keep off the roads and stay home.
Kansas residents warned of icy roads and told to stay home
Amtrak has announced sweeping cancellations across its network as the US braces for the worst of the coming winter storm.
It has done so "for the safety of Amtrak customers and employees", the rail service says.
A full list of adjustments is available on the Amtrak website., external
More than 2,000 flights have been delayed and 1,500 cancelled in and out of the US today, according to tracking website FlightAware.
According to the live data, Kansas City International Airport is the worst affected for outbound flights, with 86% cancelled.
For inbound flights, St. Louis Lambert International Airport in Missouri tops the chart, with 53% of flights delayed and 7% cancelled as of 10:20 local time (16:20 GMT).
The winter storm is continuing to sweep its way eastwards across the US, bringing with it a mix of snow, strong winds and rain.
BBC Weather presenter Elizabeth Rizzini warns of "really treacherous travelling conditions" throughout Sunday as heavy snow hits, particularly in the northern areas hit by the storm.
There'll be milder air towards the south of the storm, which could lead to thunderstorms.
Elizabeth has the latest forecast below.
Watch: Heavy snow as severe US winter storm moves east
We can now show you a map depicting the path of the storm.
Major cities in the Midwest and eastern US are in the path of the snow, with heavy accumulation expected in Washington DC and Indianapolis, Indiana. Kansas City, Missouri - which is under a blizzard warning - could see more than 8in (20cm) of snow.
The lowest temperatures in more a decade possible in parts of the US - but what are the usual temperatures in the worst-hit states?
We've mentioned several times today that this could be the coldest January in the US since 2011, when average temperatures plunged to 30F (-1C).
This was 0.8F (0.4C) below the 1901 to 2000 average, and made it the coolest January since 1994, according to a government climate report, external at the time.
Several winter storms impacted the northeastern US during that month, causing New York City and Hartford, Connecticut to break January snowfall records.
American Airlines has issued travel alerts for 46 airports due to the winter storm expected to sweep across the middle of the US and the east coast.
The alert covers airports in several states, from Kansas and Missouri, to Pennsylvania and New Jersey. The airline has published a full list of conditions for ticket changes., external
American says it may be able to waive change fees for customers travelling to and from those airports because of the potential flight disruptions.
Delta, Southwest and United airlines have offered similar services to their customers.
Image source, ReutersBitterly cold wind chills are due across parts of central Kansas over the next couple of days, as a winter storm sweeps the US.
The branch of the National Weather Service (NWS) in Wichita - a major city in south-central Kansas - says wind chills of -20F (-29C) and below are expected.
Some of the coldest winds will be felt in the cities of Russell and Salina on Monday morning, according to a weather map the NWS shared on X.
Elsewhere, temperatures are already dropping.
In a separate post, NWS Washington says it recorded lows of 13.7F (-10C) at its office near Dulles Airport, a major international travel hub near downtown Washington DC.
At least 15in (38.1cm) of snow is forecast - the heaviest in a decade - which will significantly reduce visibility and make travel "extremely hazardous", the National Weather Service (NWS) says.
On top of that, there'll be strong wind gusts of up to 40mph (64kmh) and possible blizzards.
The storm is forecast to sweep eastwards from central US and the Midwest throughout Sunday, reaching the Mid Atlantic region by this evening.
Disruption will continue into Monday, the NWS adds, before the storm begins to subside by Tuesday morning.
As a reminder, five states have so far declared a state of emergency - Kentucky, Virginia, Kansas, Arkansas and Missouri.
Forecasters say that the extreme weather is being caused by the polar vortex - an area of cold air that circulates around the Arctic.
Usually, the polar vortex stays up around the North Pole, but it can shift and expand, bringing lower temperatures further south than usual.
The polar vortex has been expanding over the US in recent days before the winter storm began to hit on Saturday evening.
It's expected to move eastwards in the coming days bringing a mix of snow, ice and sub-zero temperatures.
The huge winter storm that could bring the heaviest snowfall and coldest temperatures in over a decade, with tens of millions of Americans expected to be affected.
The storm, which started in the middle of the US, will move east in the next couple of days, the National Weather Service (NWS) said.
AccuWeather forecaster Dan DePodwin said: "This could lead to the coldest January for the US since 2011."
He added that "temperatures that are well below historical average" could linger for a week.
Those low temperatures will be on the east coast as well, where the storm is expected to reach by Sunday evening.
A state of emergency has been declared in Kentucky, Virginia, Kansas, Arkansas and Missouri and parts of the US unaccustomed to severe cold, including Mississippi and Florida, have been warned to expect treacherous conditions.
A total of 30 states have been put under a weather alert as the storm is expected to travel eastwards across the country.
Cities including Washington DC, Baltimore and Philadelphia are preparing for snowy and icy conditions from Sunday into Monday.
Image source, APIt's just turned 07:30 in the US (12.30 GMT) and many Americans are waking up to the news that there will be "considerable disruptions to daily life" and "dangerous or impossible driving conditions and widespread closures" across the central US - according to the National Weather Service (NWS) says.
And in parts of the Midwest, blizzards are possible.
"Whiteout conditions will make travel extremely hazardous, with impassable roads and a high risk of motorists becoming stranded," the NWS warned.
As we reported earlier, conditions on roads have already deteriorated, with one state high patrol trooper urging people to stay at home.
American, Delta, Southwest and United airlines are waiving change fees for passengers because of the potential flight disruptions.
Matt Spivey
Live page editor
Welcome to our live coverage, the US is bracing for a severe winter storm that could bring the heaviest snowfall and coldest temperatures since 2011 as 30 states have been put under weather alerts.
A state of emergency has been declared in Kentucky, Virginia, Kansas, Arkansas and Missouri.
Conditions on roads have already deteriorated, with poor weather leading to crashes involving lorries and cars, as well as a fire truck rolling over in Kansas, according to state highway patrol trooper Ben Gardner.
Parts of the US unaccustomed to severe cold, including Mississippi and Florida, have been warned to expect treacherous conditions.
As the storm moves east, millions more Americans will see record low temperatures, forecasters said.
We'll be bringing you the latest updates as we get them, stick with us.