More than 7,600 flights have already been cancelled for Tuesday as the incoming Northeast blizzard is predicted to cripple the country’s air travel.

Authorities have advised 50 million people to prepare for what could be the worst storm this winter season from New York City to Boston.

Winter Storm Stella is expected to sweep the New York region with blizzard conditions, as experts predict the region could see 12 to 24 inches of wind-blasted snow from Monday to early Wednesday.

In preparing for the huge storm, airline officials have already begun cancelling flights ahead of time. 

According to the airline-tracking website FlightAware, more than 5,000 flights Tuesday were canceled, including more than 2,800 in the New York City area, where about 200 passengers were stranded at John F. Kennedy airport. 

Amtrak also canceled and modified service up and down the Northeast Corridor. In New York City, the above-ground portions of the subway system were being shut down Tuesday morning. 

More than 2,000 flights were cancelled for Monday, and more than 7,600 have been cancelled for Tuesday.

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Getting ready: In preparing for the huge winter storm, airline officials have already begun cancelling flights ahead of time. Above a United Airlines plane departs at O'Hare International Airport in Chicago on Monday during the snowstorm

Getting ready: In preparing for the huge winter storm, airline officials have already begun cancelling flights ahead of time. Above a United Airlines plane departs at O’Hare International Airport in Chicago on Monday during the snowstorm

More than 7,600 flights have already been cancelled for Tuesday as the incoming Northeast blizzard is predicted to cripple the country's air travel. Above a departure board in the American Airlines terminal   at O'Hare International Airport in Chicago

More than 7,600 flights have already been cancelled for Tuesday as the incoming Northeast blizzard is predicted to cripple the country’s air travel. Above a departure board in the American Airlines terminal at O’Hare International Airport in Chicago

The above satellite image shows Winter Storm Stella activity in the Eastern part of the U.S. on Monday as nearly half of the country is caught in an icy blast. The East Coast is preparing for what is believed to be the worst winter storm of the year

The above satellite image shows Winter Storm Stella activity in the Eastern part of the U.S. on Monday as nearly half of the country is caught in an icy blast. The East Coast is preparing for what is believed to be the worst winter storm of the year

Officials are warning of blizzard conditions that will hit the East Coast due to Winter Storm Stella. More than 5,000 flights have already been cancelled on Monday and Tuesday

Officials are warning of blizzard conditions that will hit the East Coast due to Winter Storm Stella. More than 5,000 flights have already been cancelled on Monday and Tuesday

Weather officials say that due to the blizzard-like conditions, visibility will be difficult Tuesday morning at the three major airports in the tri-state area

Weather officials say that due to the blizzard-like conditions, visibility will be difficult Tuesday morning at the three major airports in the tri-state area

Tuesday’s cancellations includes roughly hundreds of flights on Southwest Airlines, JetBlue and American Airlines.

More cancellations were expected, with Southwest planning to stop almost all of its Northeast flights Tuesday. Other airlines were considering similar moves.

Major US airlines will allow ticketed travelers affected by the storm to change their flights without an additional fee. 

Officials are asking those with travel plans early this week to check with airlines ahead of time to see about possible cancellations or delays. 

A state of emergency has been issued in four states across the northeast as Winter Storm Stella is set to slam the area with up to two feet of snow on Monday and Tuesday.

State of emergencies in New York, New Jersey, Connecticut and Maryland have all taken effect as of midnight on Monday and 50 million residents are being urged to prepare for the ‘life-threatening’ storm. 

The harsh winter weather has already claimed lives in Milwaukee after two elderly men on different sides of the city collapsed while shoveling snow on Monday. 

Officials have warned of unsafe driving conditions caused by the snow, which have spurred statewide travel bans in Connecticut and modified public transportation services in several other states.

Also in Milwaukee, a 17-car pileup involving 12 cars and five tractor trailers crashed just before noon on Monday on the northbound lanes of I-43. Three people suffered minor injuries but there were no deaths.  Several crashes were also reported in Michigan due to the snowy weather. 

Cities from Buffalo, New York all the way to Boston, Massachusetts are currently under winter storm warning as the New York City region is under blizzard warning. Up to two feet of snow is expected to fall in some cities in the Northeast

Cities from Buffalo, New York all the way to Boston, Massachusetts are currently under winter storm warning as the New York City region is under blizzard warning. Up to two feet of snow is expected to fall in some cities in the Northeast

The darker blue regions depict areas where more snow is likely to fall beginning Monday night

The darker blue regions depict areas where more snow is likely to fall beginning Monday night

On Tuesday a snow ice mix will hit parts of New York City to Philadelphia as the temperatures will still be chilly 

On Tuesday a snow ice mix will hit parts of New York City to Philadelphia as the temperatures will still be chilly 

Going into Tuesday night, the weather will still be cold, as many parts of the East Coast will still see a mix of snow and ice mix

Going into Tuesday night, the weather will still be cold, as many parts of the East Coast will still see a mix of snow and ice mix

Dan Zionce refills the milk section for the third time since the morning at Gerrity's Supermarket in Luzerne, Pennsylvania on Monday. The store was bustling with shoppers buying milk, bread and other groceries in preparations for the storm

Dan Zionce refills the milk section for the third time since the morning at Gerrity’s Supermarket in Luzerne, Pennsylvania on Monday. The store was bustling with shoppers buying milk, bread and other groceries in preparations for the storm

Gloria Ann Rinus, of Shavertown, places a half gallon of milk in her shopping cart at Gerrity's Supermarket, in Luzerne on Monday ahead of the storm

Gloria Ann Rinus, of Shavertown, places a half gallon of milk in her shopping cart at Gerrity’s Supermarket, in Luzerne on Monday ahead of the storm

Stella is expected to sweep the New York region with extreme conditions, as experts predict the storm could bring 12 to 24 inches of wind-blasted snow from Monday to early Wednesday.

HOW MUCH SNOW?

New York City: 20 – 24 inches 

Boston: 12 – 18 inches

Philadelphia:  6 – 12 inches 

Baltimore: 8 to 12 inches 

Washington D.C.:  6 – 8 inches 

Chicago: 3 – 6 inches 

Detroit: 2 to 3 inches 

The city previously issued a snow alert for Monday night into Tuesday, expecting snowfall rates of up to 2 to 4 inches per hour Tuesday morning and afternoon, with gusts of up to 50 mph.

‘This would certainly be the biggest snowstorm of the 2017 winter season in New York City,’ said Faye Barthold, a weather service meteorologist based on Long Island.

President Trump tweeted urging ‘everyone be safe’ as he met with local authorities in D.C. to discuss preparations there, where the region is experiencing a winter weather warning, alongside mid-Atlantic and Northeast cities including Boston, Philadelphia, Baltimore.

Blizzard warnings have been issues for areas in eastern Pennsylvania, northern New Jersey, southeast New York, Connecticut, northern Rhode Island, western/central Massachusetts, southeast New Hampshire and southern Maine. 

Authorities are warning residents across all affected areas to prepare for the possibility of widespread power outages, road closures and flight disruptions.

WINTER STORM STELLA TIMELINE

Forecasters predict that Tuesday’s commute will be dangerous as blizzard conditions will make roads and highways impassible. 

With winds of up to 50mph predicted, whiteout conditions will likely be created for many commuters along the Northeast.

Winter Storm Stella is expected to dump up to two feet of snow in New York City, according to National Weather Service forecasters. 

Below is an hour by hour timeline of what to expect for this winter storm in New York City, according to weather forecasters: 

TUESDAY:

  • Beginning after midnight snow will begin to fall in the city
  • Temperatures will drop to around 31 degrees overnight and stay there roughly throughout the morning
  • National Weather Service meteorologist Melissa Dispigna said around that ‘the period of intense snow will probably start around 6am’
  • About 2 to 4 inches of snow per hour will fall along with winds gusting up to 50mph creating ‘whiteout conditions’
  • At 10:20am, forecasters predict 2 to 3 feet of flooding in coastal areas which is around the time of high tide
  • In the late morning to early afternoon, snow may be interrupted with some precipitation during this period 
  • By sundown around 7pm, the storm is expected to be roughly finished, though some snow flurries may continue through the evening into the night
  • Forecasters say winds will continue through the night with temperatures dropping to around 20 degrees 

 WEDNESDAY:

  • Forecasters say that temperatures will rise up to roughly 32 degrees as the winds will continue to blow around 20mph 
  •  Snow showers will happened occasionally throughout the day and into the afternoon 

THURSDAY AND FRIDAY: 

  • Forecasters say the sun should come out and temperatures will begin to rise, which will help to melt the snow
  • Thursday it is expected to be around 36 degrees in the day and on Friday it will be around 41 degrees 

As of Monday evening, 5,320 flights had been cancelled within, into or out of the United States. This had increased to 7,600 by early Tuesday.

The brunt of those cancellations took place at Chicago O’Hare International airport, where the city is anticipating its first snow of 2017, which is rare for the exceptionally cold city.    

The Port Authority of New York and New Jersey was installing hundreds of pieces of snow equipment at the three New York area airports. 

Thousands of tons of salt and sand were prepared for airport roads, parking lots, bridges and tunnels. 

‘Significant amounts of snow are forecast that will make travel dangerous. Only travel in an emergency. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency,’ the weather service said. 

New York City issued a snow alert for Monday night into Tuesday, expecting snowfall rates of up to 2 to 4 inches per hour Tuesday morning and afternoon, with gusts of up to 50 mph. 

A Wisconsin Sate Patrol officer checks on a person involved in a crash on Interstate 41 southbound Monday while heavy snow falls during the winter storm that's heading east

A Wisconsin Sate Patrol officer checks on a person involved in a crash on Interstate 41 southbound Monday while heavy snow falls during the winter storm that’s heading east

Streets Department crews load salt in preparations for an expected winter snow storm in Philadelphia on Monday

Streets Department crews load salt in preparations for an expected winter snow storm in Philadelphia on Monday

A pickup truck with a snow plow passes a sign at a garden supply store in Alexandria, Virginia on Monday ahead of the winter storm

A pickup truck with a snow plow passes a sign at a garden supply store in Alexandria, Virginia on Monday ahead of the winter storm

Mayor Bill de Blasio warned New Yorkers that ‘besides the snow, it will be cold,’ while officials recommended that people avoid driving and use mass transit when possible. 

Blowing snow and strong winds could lead to whiteout conditions with visibility as poor as a quarter mile, the service said. 

Sub-freezing temperatures were forecast in the upper 20s Fahrenheit.

New Yorkers began stocking up on groceries, salt and emergency supplies over the weekend through Monday as they prepared for a snow day inside. 

New York City Mayor Bill de Blasio and Boston Mayor Marty Walsh announced that all public schools in both cities will be closed Tuesday due to the storm. 

WHAT TO EXPECT WHEN THE WINTER STORM HITS 

Air travel 

Air travel will be disrupted, as more than 5,000 flights have been grounded ahead of the storm.

More than 2,145 flights have been cancelled already for Monday, and a whopping 5,082 have been cancelled for Tuesday. 

More cancellations were expected, with Southwest planning to stop almost all of its Northeast flights Tuesday. Other airlines were considering similar moves.

Major US airlines will allow ticketed travelers affected by the storm to change their flights without an additional fee. 

Public transportation

A meteorologist predicted travel chaos in the New York area once the storm begins. 

‘Traveling on Tuesday is going to be a no go, to be honest with you,’ meteorologist Tom Kines told the New York Post. ‘All travel, by land or air, is going to be a problem. If you have a choice of staying home on Tuesday, I would chose to stay home.’

The Port Authority of New York and New Jersey was installing hundreds of pieces of snow equipment at the three New York area airports, including snow melters that can liquefy up to 500 tons of snow per hours and plows that can clear snow at 40 mph. 

Thousands of tons of salt and sand were prepared for airport roads, parking lots, bridges and tunnels.

The New York City Department of Sanitation is taking similar action and also notifying additional workers to supplement staff if needed. 

All above-ground Metropolitan Transportation Authority train service will be shut down beginning at 4am Tuesday as a dangerous snowstorm blows into the area.

Once the nor’easter hits, motorists in New York state can call 511 or access www.511ny.org to check on road conditions and transit information.

Road closures 

New York Governor Andrew Cuomo warned commuters against road closures, delays and cancellations. 

‘I encourage all New Yorkers in affected regions to plan ahead, and avoid any unnecessary travel as the storm progresses,’ he said in a statement.

Trains 

Amtrak will be running on a modified schedule on March 14, with some cancellations and delays.

Keystone Service will operate on a severe weather schedule.

The following Empire Service trains will not operate: 230, 234, 238, 242, 281, 235, 237, 241.

The following Downeaster Service trains will not operate: 688, 689.

Amtrak is encouraging commuters to check weather conditions and and allow additional time for travel. 

Travelers can check https://twitter.com/amtraknec for updates.

School closures

New York City Mayor Bill de Blasio announced on Monday that all public schools in the city will be closed Tuesday due to snow. 

Boston Mayor Marty Walsh also announced on Monday that schools in the city will be closed Tuesday.

New Jersey schools also seemed likely to be affected as some of them have experienced closures or delayed opening due to snow in recent days.

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