More than 400,000 customers in the US as far west as Texas were without power and more than 9,600 flights were expected to be canceled on Sunday ahead of a monster winter storm that threatened to paralyze eastern states with heavy snowfall.
Forecasters said snow, sleet, freezing rain and dangerously frigid temperatures would sweep the eastern two-thirds of the nation on Sunday and into the week.
Calling the storms "historic," President Donald Trump on Saturday approved federal emergency disaster declarations in South Carolina, Virginia, Tennessee, Georgia, North Carolina, Maryland, Arkansas, Kentucky, Louisiana, Mississippi, Indiana, and West Virginia.
"We will continue to monitor, and stay in touch with all States in the path of this storm. Stay Safe, and Stay Warm," Trump wrote in a post on Truth Social.
'CRIPPLING TO LOCALLY CATASTROPHIC IMPACTS' FORECAST
Seventeen states and the District of Columbia have declared weather emergencies, the Department of Homeland Security said.
DHS Secretary Kristi Noem, at a news conference on Saturday, warned Americans to take precautions.
"It’s going to be very, very cold," Noem said. "So we'd encourage everybody to stock up on fuel, stock up on food, and we will get through this together."
"We have utility crews that are working to restore that as quick as possible," Noem added.
The number of outages continued to rise. As of 6:30 a.m. EST (1130 GMT) on Sunday, more than 400,000 US customers were without electricity, according to PowerOutage.us, with 100,000 each in Mississippi and Texas. Other states affected included Louisiana, Tennessee and New Mexico.
ENERGY DEPARTMENT ORDERS BACKUP RESOURCES
The Department of Energy on Saturday issued an emergency order authorizing the Electric Reliability Council of Texas to deploy backup generation resources at data centers and other major facilities, aiming to limit blackouts in the state.
On Sunday, the DOE issued an emergency order to authorize grid operator PJM Interconnection to run "specified resources" in the mid-Atlantic region, regardless of limits due to state laws or environmental permits.
The National Weather Service warned of an unusually expansive and long-duration winter storm that would bring widespread, heavy ice accumulation in the Southeast, where "crippling to locally catastrophic impacts" can be expected.
Weather service forecasters predicted record cold temperatures and dangerously cold wind chills descending further into the Great Plains region by Monday.
More than 9,600 US flights scheduled for Sunday were canceled, according to flight tracking website FlightAware, with over 4,000 flights canceled on Saturday.
AIRLINES, GRID OPERATORS SCRAMBLE TO PREPARE
Major US airlines warned passengers to stay alert for abrupt flight changes and cancellations.
Delta Air Lines adjusted its schedule on Saturday, with additional cancellations in the morning for Atlanta and along the East Coast, including in Boston and New York City.
It would relocate experts from cold-weather hubs to support de-icing and baggage teams at several southern airports, the airline said.
JetBlue said that as of Saturday morning it had canceled about 1,000 flights through Monday.
United Airlines said it had proactively canceled some flights in places with the worst expected weather.
US electric grid operators on Saturday stepped up precautions to avoid rotating blackouts.
Dominion Energy, whose Virginia operations include the largest collection of data centers in the world, said if its ice forecast held, the winter event could be among the largest to affect the company.
