The winter weather this weekend caused travel problems during the busiest time of year. On Sunday, more than 10,000 flights were delayed nationwide, according to the flight tracking website FlightAware. On Monday, the disruption was less severe, with less than 500 flights delayed in the U.S., according to the site.

Millions of residents across multiple states in the U.S. have been warned to brace for a possible bomb cyclone, forecast to hit from Monday, December 29, through to the weekend, bringing heavy winds and wintry conditions, prompting the National Weather Service (NWS) to issue storm warnings and advise drivers not to travel unless it’s an emergency.

A major winter storm is pummeling the Tri-State Area with snow and ice after New York and New Jersey declared states of emergency.

A powerful, rapidly intensifying winter storm sweeping across the central and eastern United States is knocking out power and snarling travel during one of the busiest stretches of the holiday season.

New York City and surrounding areas are in line to get 6 to 9 inches (15 to 23 cm) of snow, with a winter-storm warning in effect between 4 p.m. Friday to 1 p.m. Saturday, local time, according to the National Weather Service.

Austin Mayor Kirk Watson and Travis County Judge Andy Brown say their winter weather plans include minimizing power outages, keeping roads safe and opening places for people to stay warm during the day and overnight.

Saturday’s forecast low is 19, with a 70% chance of precipitation. One to 2 inches of snow accumulation is expected.

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The National Weather Service warned of whiteout conditions and possible blizzard conditions that could make travel impossible in some areas.