Stretched polar vortex brings winter blast to much of US

A stretched polar vortex is set to bring dangerous winter weather to much of the United States starting Friday, with forecasters warning of subzero temperatures, heavy snow, and damaging ice across a region spanning from New Mexico to New England. About 230 million people face temperatures of 20 degrees Fahrenheit or colder, while approximately 150 million are expected to experience snow and ice, according to the National Weather Service. Meteorologists trace the system’s origins to a warming Arctic and record-low sea ice levels that have disrupted weather patterns across the Northern Hemisphere.

The combination of ice accumulation and sustained cold could cause widespread power outages, tree damage, and transportation disruptions across much of the nation. Meteorologists said the frigid conditions are likely to persist through the rest of January and into early February, meaning accumulated snow and ice will take longer to melt and extend impacts on communities already recovering from recent storms.

The Meteorological Setup

A stretched polar vortex—a rare elongation of the Arctic’s normally compact band of frigid air—is responsible for the extreme winter blast. Ryan Maue, a private meteorologist and former chief scientist at the National Oceanic and Atmospheric Administration, said the upper atmosphere’s wave pattern is aligned to allow the polar vortex to push far south from its typical confinement in northern Canada and Alaska.

“The atmosphere is aligned perfectly that the pattern is locked into this warm Arctic, cold continent,” Maue said. “And it’s not just here for us in North America, but the landmass of Eastern Europe to Siberia is also exceptionally cold. The whole hemisphere has gone into the deep freeze.”

The origins of this pattern trace to the Arctic itself. Warmer Arctic waters are adding energy to the system, while record-low sea ice in the Barents and Kara seas—accelerated by climate change—helps set up the atmospheric waves that stretch the polar vortex southward. Heavy snowfall across Siberia compounds the effect.

Judah Cohen, an MIT research scientist specializing in winter weather, co-authored a July 2025 study documenting a link between stretched polar vortex events and severe winter weather in the central and eastern United States over the past decade. “These conditions ‘kind of loaded the dice a bit’ for a stretching of the polar vortex,” Cohen said of the current setup. Arctic sea ice is at a record low extent for this time of year, according to the National Snow and Ice Data Center.

Geographic Extent and Severity

The system will spread from New Mexico to New England, with particular intensity across the eastern two-thirds of the nation. The center of the stretched polar vortex is forecast to position itself above Duluth, Minnesota, by Friday morning.

In the North and Midwest, extreme cold will dominate, with temperatures potentially reaching minus 25 to minus 30 degrees Fahrenheit—near the coldest possible readings for those regions. The Lower 48 states’ average low temperature is expected to hover around 11 to 12 degrees Fahrenheit from Saturday through Monday.

Two Great Lakes—Erie and Ontario—may freeze up, which could reduce the famed lake-effect snow that normally falls downwind of these bodies of water, Maue said.

Snow, Ice, and Infrastructure Risk

Across the southern plains and mid-South into the Carolinas, treacherous freezing rain could accumulate on roads, trees, and power lines. Zack Taylor, a meteorologist at the National Weather Service’s Weather Prediction Center, said the ice could be severe.

“We’re looking at the potential for impactful ice accumulation. So the kind of ice accumulation that could cause significant or widespread power outages or potentially significant tree damage,” Taylor said.

North of the ice zone, heavy snow is forecast for the Ozarks region, Tennessee and Ohio valleys, central Appalachians, and mid-Atlantic, though Taylor said it was too early to predict exact snowfall totals.

In the mid-Atlantic around the nation’s capital, Maue warned of an unusual risk: “You can get two blizzards on top of each other in the next 14 days.”

Duration and Climate Context

Unlike earlier winter storms that pass quickly, this system’s impacts are expected to linger. Meteorologists said the frigid conditions are likely to persist through the rest of January and into early February. As snow and ice accumulate, the sustained cold means the precipitation will remain on the ground longer than in milder winters, extending impacts on communities already recovering from repeated storms earlier in the season.

The stretched polar vortex itself reflects broader changes in the Arctic driven by rising global temperatures. While warmer Arctic waters add energy to the system, the loss of sea ice—a direct consequence of Arctic warming—disrupts the normal atmospheric circulation that would otherwise keep the polar vortex confined to the high north.

“I think people are underestimating just how bad it’s going to be,” Maue said of the coming week’s weather.