We will update this story throughout the storm as developments warrant.
Airlines at O'Hare International and Midway International in Chicago reported average delays of 15 minutes as a winter storm headed toward the Midwest with heavy snow and ice and gusty winds.
Airlines have delayed flights across the country on what is expected to be the busiest travel day in the US.
As of midday on Sunday, several flights were canceled or delayed at the Greater Rochester International Airport.
Portions of Northern California and Nevada are under winter storm watches or warnings, with NWS Sacramento saying that "travel is highly discouraged" between Saturday morning and Monday evening. Wind gusts could reach as high as 40 miles per hour.
Roads were closed Saturday across eastern and southern Wyoming due to whiteout conditions. Boston is projected to get between 3 and 6 inches of snow.
But by Sunday morning, more than 330 flights had been delayed, with almost 20 of those in the NY area, according to FlightAware.com.
Through Tuesday morning, much of the state will see snowfall.
Blizzard conditions are already impacting the High Plains and around Duluth, Minnesota, on the shores of Lake Superior.
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A deadly winter storm that has been tormenting travellers across the USA since before Thanksgiving moved to the Northeast on Sunday, packing one last punch of snow and ice as people made their way home after the holiday weekend.
At least 705 storm spreaders are "loaded'" and ready to go ahead of snowy weather expected in NY today and tomorrow, NYC Sanitation Department Commissioner Kathryn Garcia said Saturday at a press conference.
In New York, numerous schools announced closings and Gov. Andrew Cuomo advised non-essential state employees to stay home as the storm was forecast to bring snow, sleet, wind and rain through the day Monday.
Another storm system developed in the mid-Atlantic Sunday and forecasters said it would move into a nor'easter through Monday.
The bodies of two children were found in central Arizona after the vehicle they were in was swept away while crossing a swollen creek. A foot of snow was forecast for parts of Northeast Pennsylvania.
Also in South Dakota, a small-engine plane carrying 12 people crashed shortly after takeoff Saturday afternoon, killing nine people and injuring three others. Lakeshore flooding is possible, the Weather Service said.
The Winter Storm Warning for counties including Seneca and Yates runs until midnight on Monday.
High winds and ice are expected to make travel nearly impossible in some places.
Millions of travelers heading back from their Thanksgiving holiday could be caught up in a fast-moving winter storm making its way east from California to the Midwest and beyond.