NEW ORLEANS — A rare frigid storm charged through Texas and the northern Gulf Coast on Tuesday, blanketing New Orleans and Houston with snow, closing highways, grounding nearly all flights and canceling school for millions of students more used to hurricane dismissals than snow days.

The storm prompted the first-ever blizzard warnings for several coastal counties near the Texas-Louisiana border, and snow plows were at the ready in the Florida Panhandle.

Heavy snow, sleet and freezing rain hit parts of the Deep South as a blast of Arctic air plunged much of the Midwest and the eastern United States into a deep freeze.

Nearly 2,000 flights to, from or within the U.S. were canceled Tuesday, with about 10,000 others delayed, according to online tracker FlightAware.com. Both Houston airports suspended flight operations starting Tuesday.

Alvaro Perez was hunkering down at George Bush Intercontinental Airport Tuesday after his flight to El Salvador, to visit his girlfriend for her birthday, was canceled. His new departure is scheduled for Thursday.

“I’ll just ride it and stay here,” said Perez, of Hockley, Texas, about 35 miles away.

Nearly every flight was canceled at New Orleans Louis Armstrong International Airport, though officials said the airport itself would remain open “as long as the conditions are safe.” Most airlines planned to resume operations today.

It has been more than a decade since snow last fell on New Orleans, where schools are closed through Thursday.

Bundled-up onlookers checked out the strange sight of Bourbon Street in the snow, including a snowcapped memorial to those killed in the New Year’s Day truck attack.

With more than 5 inches of snow already in parts of the city Tuesday, New Orleans has surpassed the highest total on record — 2.7 inches on Dec. 31, 1963 — according to the National Weather Service. There have been unofficial reports of 10 inches of snow in New Orleans in 1895, weather service meteorologist Christopher Bannan said.

The East Coast was blanketed in snow while people from the Northern Plains to the tip of Maine shivered in bitter cold from an arctic air mass that plunged temperatures well below normal.

In New Orleans, 65-year-old Robert Hammock donned a beanie and rallied himself and his border collie Tillie for a snowy morning walk.

“She loves the snow,” Hammock said, as Tillie sprawled happily in the slush on the sidewalk. “I’m from south Alabama, so I hate the snow.”

Winter storm warnings Tuesday extended from Texas to North Carolina, with heavy snow, sleet and freezing rain expected to move eastward through the region into today.

Meanwhile, a state of emergency was declared Monday night across at least a dozen counties in New York as heavy lake-effect snow was expected around Lake Ontario and Lake Erie through today — with 1 to 2 feet possible — along with extreme cold temperatures.

Ahead of the storm, governors in Georgia, Louisiana, Mississippi, Alabama and even Florida declared states of emergency and many school systems canceled classes Tuesday.

School closures were planned in some coastal communities in North and South Carolina.

The weather service said up to 4 inches of snow has so far fallen in metro Houston. Texas transportation officials said more than 20 snow plows were in use across nearly 12,000 lane miles in the Houston area, which lacks its own city or county plows.

It’s the first time Houston has seen snow since a winter storm knocked out power to millions and killed more than 200 people in 2021, according to meteorologist Hayley Adams at the weather service in Houston.

Snow is rare in Texas’ largest city. In February 1895, a two-day storm dropped a record 20 inches on metropolitan Houston.

Officials said one person has died from hypothermia in Georgia. Forecasters say snowfall could stretch from north Georgia, through Atlanta.

Parts of Florida’s Panhandle were already coated white Tuesday.