US braces itself for more blizzards
A band of frigid weather snaking its way up the east coast of the United States threatens to bring blizzards and a foot of snow to New York City and New England, while several states to the South made emergency declarations as the storm caused crashes on slick roads.
Airlines grounded hundreds of flights on Sunday along the north-east corridor in anticipation of the storm, affecting major airports including New York's JFK and Newark.
Airlines said more cancellations were likely as the storm progressed. Travel misery began a day earlier in parts of the South, where a rare white Christmas came with reports of dozens of car crashes.
In Washington transport officials pre-treated roads and readied 200 salt trucks and other pieces of equipment to fight the 6in or more expected to fall in the Mid-Atlantic region.
The north-east is expected to get the brunt of the storm. Forecasters issued a blizzard warning for New York City for Sunday and Monday.
A blizzard warning was also in effect for Rhode Island and most of eastern Massachusetts including Boston. A blizzard warning is issued when snow is accompanied by sustained winds or gusts over 35mph.
By early Sunday, Maryland, Virginia and North Carolina declared states of emergency.
"We're urging extreme caution in travel. Try to get home early and if you don't have to travel don't go," Virginia Governor Bob McDonnell told The Weather Channel.
Most air carriers were waiving fees for one-time changes in affected areas and urging passengers to make changes through their websites.
The monster storm is the result of a low pressure system that will intensify off the North Carolina coast and strengthen into a major storm as it moves north-east, according to the National Weather Service.