President Joe Biden declared states of emergency in Texas and Oklahoma Thursday, as millions of Americans endured another frigid day without electricity or heat in the aftermath of a deadly winter storm.

Biden authorized the Federal Emergency Management Agency (FEMA) to provide generators and supplies. Power was restored to more Texans on Thursday, with fewer than a half-million homes remaining without electricity, and many still were without safe drinking water after winter storms wreaked havoc on the state’s power grid and utilities this week.

Meanwhile, the Appalachians, northern Maryland and southern Pennsylvania braced for heavy snow and ice. Snow fell in Connecticut, New Jersey and New York.

Little Rock, Arkansas, got 15 inches of snow in back-to-back storms, tying a 1918 record, the National Weather Service said.

More than 320,000 homes and businesses were without power in Louisiana, Mississippi and Alabama. In Tennessee, 12 people were rescued from boats after a dock weighed down by snow and ice collapsed on the Cumberland River on Wednesday night, the Nashville Fire Department said.

“The headlining weather story today is a winter storm tracking along the Southeast coast that produces heavy snow and significant ice accumulations across the Mid-Atlantic,” the National Weather Service said Thursday morning. “The swath of heaviest snowfall is forecast to occur from the Appalachians of Virginia and West Virginia to northern Maryland and southern Pennsylvania. Snow totals of 6 to 8 inches are possible with localized totals up to a foot in the Appalachians possible.”

Elsewhere in the Southeast, and throughout Georgia, the cold front sweeping through the region is forecast to trigger heavy showers and thunderstorms. The agency’s Storm Prediction Center has issued a slight risk for severe weather from the Florida Panhandle and southern Georgia to far southern South Carolina. There is also a marginal risk for excessive rainfall for these same areas.

Showers and thunderstorms will linger along the Southeast coast Friday morning as a cold front pushes west to east. Florida will continue to experience scattered showers and storms Friday before drier conditions arrive Friday night as high pressure builds in from the west.

Nearly 3.4 million customers around the U.S. were still without electricity, and some also lost water service. Texas officials ordered 7 million people — a quarter of the population of the nation’s second-largest state — to boil tap water before drinking it following days of record-low temperatures that damaged infrastructure and froze pipes.

Power outages in Texas dropped below 1 million on Thursday morning for the first time in four days, but many people remained without electricity or safe drinking water after winter storms wreaked havoc on the state’s power grid and utilities.

Meanwhile, heavy snow and ice were expected Thursday in the Appalachians, northern Maryland and southern Pennsylvania, with the wintry weather moving into the Northeast by nightfall.

The latest storm front was certain to complicate recovery efforts, especially in states that are unaccustomed to such weather — parts of Texas, Arkansas and the Lower Mississippi Valley.

“There’s really no letup to some of the misery people are feeling across that area,” said Bob Oravec, lead forecaster with the National Weather Service, referring to Texas.

The system was forecast to move into the Northeast on Thursday. More than 100 million people live in areas covered by some type of winter weather warning, watch or advisory, the weather service said.

This week’s extreme weather has been blamed for the deaths of more than 30 people, some of whom perished while struggling to keep warm inside their homes. In the Houston area, one family succumbed to carbon monoxide from car exhaust in its garage. Another family died while using a fireplace to keep warm.

Weather-related outages have been particularly stubborn in Oregon, where some customers have been without power for almost a week.

The worst U.S. outages by far have been in Texas, where 3 million homes and businesses remained without power as of midday Wednesday. More than 200,000 additional customers were in the dark in four Appalachian states and nearly that many in the Pacific Northwest, according to poweroutage.us, which tracks utility outage reports.

The president of the Texas power grid manager, the Electric Reliability Council of Texas, said he hoped many customers would see at least partial service restored by Thursday.

Dashawn Walker, 33, was thrilled to find the power back on in his Dallas apartment. He stayed at a suburban hotel Tuesday night after being without power since Sunday but said he was charged $474 for one night.

“It’s crazy,” Walker said. “I mean, why would y’all go up on the hotels in the middle of a crisis?”

Water pressure has fallen across the state because lines have frozen, and many residents are leaving faucets dripping in hopes of preventing pipes from freezing, said Toby Baker, executive director of the Texas Commission on Environmental Quality.

Texas Gov. Greg Abbott urged residents to shut off water to their homes, if possible, to prevent more busted pipes and preserve pressure in municipal systems.

The outages in and around Portland, Oregon, affected nearly 150,000 customers nearly a week after a massive snow and ice storm toppled many trees and took out hundreds of miles of power lines.

The damage to the power system was the worst in 40 years, said Maria Pope, CEO of Portland General Electric. At the peak of the storm, more than 350,000 customers in the Portland area were in the dark.

“These are the most dangerous conditions we’ve ever seen in the history of PGE,” said Dale Goodman, director of utility operations, who declined to predict when all customers would have power restored.

Utilities from Minnesota to Texas implemented rolling blackouts to ease the burden on strained power grids. The Southwest Power Pool, a group of utilities covering 14 states, said the blackouts were “a last resort to preserve the reliability of the electric system as a whole.”

The weather also disrupted water systems in several Southern cities, including in New Orleans and Shreveport, Louisiana, where city fire trucks delivered water to several hospitals, and bottled water was being brought in for patients and staff, Shreveport television station KSLA reported.

Power was cut to a New Orleans facility that pumps drinking water from the Mississippi River. A spokeswoman for the Sewerage and Water Board said on-site generators were used until electricity was restored.

In the southwest Louisiana city of Lake Charles, Mayor Nic Hunter said Wednesday that water reserves remained low and local hospitals were faced with the possibility they might have to transfer patients to other areas.