This article explains how the first La Niña-driven cold snap will spread across the United States, what regions and cities are most likely to see freezing temperatures and snow, and which areas could flirt with record lows and heavy lake-effect snow before milder conditions return midweek.
A low pressure system moving out of Canada will pry Arctic air southward and give millions of Americans their first real taste of winter next week. Forecasters expect colder-than-normal temperatures to arrive Sunday and hang around into the early part of the week. This pattern looks like a classic La Niña signal, which tends to favor colder outbreaks and coastal storms in parts of the East.
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Cold air from Canada will settle into the eastern half of the country by Sunday and remain through much of the week. Meteorologists warn that roughly 35 states could see below-freezing overnight lows, putting nearly 170 million people at risk of frost and freeze conditions. That many states shifting below 32 degrees will complicate outdoor activities and the start of the heating season for a lot of households.
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Sunday morning could bring single-digit wind chills across Minnesota, Iowa, Nebraska and the Dakotas, raising the risk for exposure during outdoor chores or travel. Interior regions will feel the worst of it when wind-driven temperatures drop into the teens or single digits. These conditions will make early-season frost a real concern for farmers and commuters alike.
Major cities will also see a dramatic change. Forecast highs struggle to climb out of the 30s in some places during the day, and morning temperatures could hover near 20 degrees in spots like Pittsburgh, Detroit, St. Louis and Minneapolis. Southern urban centers will be chilly too, with Dallas, Nashville and Atlanta looking at 30-degree starts on some mornings.
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Breezy conditions with gusts in the 20-35 mph range will intensify the chill factor, especially across the interior Northeast where wind chills could sit in the teens. That wind will make outdoor exposure feel significantly colder than the thermometer reads, complicating travel and outdoor work. The combination of wind and cold also increases the chance for slick spots if any residual precipitation freezes on contact.
By Tuesday, forecasters say several locations across the Southeast could challenge or even break long-standing daily low-temperature records, with some records dating back a century at risk. Those record-attempting lows would be notable because they would arrive well before the official start of winter on Dec. 21. When readings threaten long-standing marks, it stresses infrastructure systems and can lead to surprise disruptions for communities that have not yet winterized.
As the pattern shifts, winds are expected to turn westerly and crank up lake-effect snow downwind of the Great Lakes. Western Michigan and parts of western New York could pick up bands of heavier snow, with typical accumulations around 5-8 inches and isolated pockets seeing 8-12 inches. Those localized, intense snow bands are hazardous because they can lay down several inches in short order and reduce visibility on key travel corridors.
The first blast of winter won’t be permanent; average temperatures are forecast to rebound by midweek as milder air moves back in. Still, the early taste of deep cold will remind households to check heating systems and protect vulnerable plants and pipes. With La Niña leaning colder overall, this early event may set the tone for intermittent cold snaps through the season.
