Seacoast New Hampshire and southern Maine are bracing for the largest snowfall of 2025 to date, expected Sunday night ahead of an Arctic blast.

A polar vortex is slated to sweep most of the continental US bringing winter storm warnings and a hazardous freeze to millions.

While more sunshine is expected today, it will be paired with bitter cold temperatures. Most locations will struggle to reach the mid single digits with wind chills staying well below zero. Improvements are made by the end of the week as the Arctic air recedes.

A combination of frigid air with a low pressure system over the Gulf are behind the storm, which could bring heavy snow just south of the Interstate 20 corridor across northern Louisiana and into Mississippi and a mix of snow, sleet, and freezing rain near the Interstate 10 corridor from Houston to Mobile, Alabama.

Residents across the country from the Northern Plains to the tip of Maine are bracing for dangerously low temperatures as residents along the East Coast contend with a thick blanket of snow — and more snowfall in the forecast.

Heavy snow is expected to blanket large portions of the Eastern U.S. while much of the country will endure dangerously cold temperatures in the coming days

Classes were canceled Wednesday for Maine South High School in Park Ridge, after a sprinkler line water pipe burst before the school day started. Students were allowed to stay in common areas of the school for the day. About 2,600 students were affected.

Residents across parts of the Gulf Coast and South are bracing for a rare winter storm expected to drop heavy snow and create treacherous conditions, including freezing rain and sleet.

Boston and the rest of New England have been dealing with well below-average temperatures, in some cases falling 20 degrees, as an expansive mass of Arctic air spreads across the eastern half of the United States. This cold surge is making our region this week feel colder than Anchorage, Alaska, which is topping out at 36 degrees.

At least 1,100 flights into or out of the US were canceled by Sunday evening with another 5,017 delayed, according to the flight-tracking website FlightAware. Over 20% of flights into or out of Newark Liberty International Airport and LaGuardia Airport were canceled, the site shows.

Accumulating snow is expected tonight into tomorrow, with gusty northwesterly winds resulting in blowing snow. Temperatures crash tonight into tomorrow, with cold air settling in through the middle of the work week.