Emergency crews in central Spain cleared 500 roads and rescued over 1,500 people stranded in their vehicles, allowing Madrid and other areas on Sunday to slowly shovel out of the country's worst snowstorm in recent memory.

After recording 50 centimeters (20 inches) of snow in the Spanish capital between Friday night and Saturday, Madrid and a large swathe of the country remained impassable Sunday, with roads, rail lines and air travel disrupted by Storm Filomena. The blizzard has been blamed for four deaths.

People walk during a heavy snowfall in downtown Madrid, Spain, Saturday, Jan. 9, 2021. A persistent blizzard has blanketed large parts of Spain with 50-year record levels of snow, halting traffic and leaving thousands trapped in cars or in train stations and airports that suspended all services as the snow kept falling on Saturday. (AP Photo/Andrea Comas)

People walk during a heavy snowfall in downtown Madrid, Spain, Saturday, Jan. 9, 2021. A persistent blizzard has blanketed large parts of Spain with 50-year record levels of snow, halting traffic and leaving thousands trapped in cars or in train stations and airports that suspended all services as the snow kept falling on Saturday. (AP Photo/Andrea Comas)

Transport Minister José Luis Ábalos said by Sunday crews had cleared two runways at Madrid’s Adolfo Suárez Madrid-Barajas International Airport and, weather permitting, service would slowly return sometime between Sunday evening and Monday.

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Trains traversing the capital were to start gradually coming back online Sunday afternoon, Ábalos said, but the important high-speed line linking Madrid with Barcelona remained out of operation.

People walk past the Cibeles monument, left, in front of the City Hall during a heavy snowfall in downtown Madrid, Spain, Saturday, Jan. 9, 2021. A persistent blizzard has blanketed large parts of Spain with 50-year record levels of snow, halting traffic and leaving thousands trapped in cars or in train stations and airports that suspended all services as the snow kept falling on Saturday. (AP Photo/Andrea Comas)

People walk past the Cibeles monument, left, in front of the City Hall during a heavy snowfall in downtown Madrid, Spain, Saturday, Jan. 9, 2021. A persistent blizzard has blanketed large parts of Spain with 50-year record levels of snow, halting traffic and leaving thousands trapped in cars or in train stations and airports that suspended all services as the snow kept falling on Saturday. (AP Photo/Andrea Comas)

More than 150 roads were still impassable Sunday. Authorities said all trips by car should be postponed and tire chains were obligatory for journeys that could not be avoided. They said all people trapped in their cars by the snow had been rescued, but hundreds of cars needed to be recovered after being abandoned by drivers.

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Storm Filomena has lost strength as it moved eastward, but authorities are still urging people to remain at home to limit the risk of falls on icy streets as a cold front moves in.

A woman skies past the Cibeles monument in front of the City Hall during a heavy snowfall in central Madrid, Spain, Saturday, Jan. 9, 2021. An unusual and persistent blizzard has blanketed large parts of Spain with snow, freezing traffic and leaving thousands trapped in cars or in train stations and airports that had suspended all services as the snow kept falling on Saturday. The capital, Madrid, and other parts of central Spain activated for the first time its red weather alert, its highest, and called in the military to rescue people from cars vehicles trapped in everything from small roads to the city's major thoroughfares. (AP Photo/Paul White)

A woman skies past the Cibeles monument in front of the City Hall during a heavy snowfall in central Madrid, Spain, Saturday, Jan. 9, 2021. An unusual and persistent blizzard has blanketed large parts of Spain with snow, freezing traffic and leaving thousands trapped in cars or in train stations and airports that had suspended all services as the snow kept falling on Saturday. The capital, Madrid, and other parts of central Spain activated for the first time its red weather alert, its highest, and called in the military to rescue people from cars vehicles trapped in everything from small roads to the city's major thoroughfares. (AP Photo/Paul White)

"The danger is not over," Interior Minister Fernando Grande-Marlaska said. "A week of extreme cold is coming and that will transform all the snow on the ground into ice, thereby multiplying the risk. The storm is bringing with it a cold wave that could push temperatures down to record levels."

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Spain’s weather service forecasts temperatures to drop as low as -14 degrees Celsius (6 degrees Fahrenheit) in the eastern province of Albacete by Tuesday.

People walk during a heavy snowfall in Madrid, Spain, Saturday, Jan. 9, 2021. An unusual and persistent blizzard has blanketed large parts of Spain with snow, freezing traffic and leaving thousands trapped in cars or in train stations and airports that had suspended all services as the snow kept falling on Saturday. The capital, Madrid, and other parts of central Spain activated for the first time its red weather alert, its highest, and called in the military to rescue people from cars vehicles trapped in everything from small roads to the city's major thoroughfares. (AP Photo/Andrea Comas)

People walk during a heavy snowfall in Madrid, Spain, Saturday, Jan. 9, 2021. An unusual and persistent blizzard has blanketed large parts of Spain with snow, freezing traffic and leaving thousands trapped in cars or in train stations and airports that had suspended all services as the snow kept falling on Saturday. The capital, Madrid, and other parts of central Spain activated for the first time its red weather alert, its highest, and called in the military to rescue people from cars vehicles trapped in everything from small roads to the city's major thoroughfares. (AP Photo/Andrea Comas)

The sparsely populated province of Teruel remained under red alert for intense snowfall, while large areas of eastern Aragón and Catalonia also were under alert with wintry weather.

Army emergency brigades focused Sunday on clearing access to Madrid’s main fresh food distribution center and to hospitals, as Spain also grappled with its coronavirus crisis, with infections on the rise following the Christmas holidays.

Grande-Marlaska said the government will take extra steps to ensure that the country’s weekly shipment of the Pfizer-BioNTech coronavirus vaccine on Monday can be distributed to regional health authorities via police-escorted convoys.

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Spain has seen over 51,800 confirmed virus deaths in the pandemic.