A full dose of winter is in store for much of the U. S. this week as a polar vortex oozes its way across the nation and a nasty winter storm develops. The north-central U. S. has been enduring dangerous, bitter cold for several days now because of a shift in the vortex from the Arctic into the U. S., AccuWeather said, and no letup in the frigid weather is in sight. On Tuesday, wind chills as low as 40 to 50 degrees below zero were reported across portions of the northern Plains and Upper Midwest, the National Weather Service said, and the cold will continue: "High temperatures will struggle to make it above zero from Montana to Minnesota through the next few days, with lows in the negative teens and negative 20s."AccuWeather senior meteorologist Alex Sosnowski said the chill isn't leaving soon. "Unfortunately for people who really mind the cold, Arctic air is going to remain entrenched over much of the north-central states into this weekend."People should limit their time outside, and those who do head outdoors should take precautions to cover their skin, weather.com advised.“Frigid temperatures are expected to continue for as long as our models go,” the weather service in Kansas City said in an online forecast Tuesday. “This weekend temperatures could be reaching near record cold ... proper preparation and apparel is a must for anyone venturing outside over the next several days.”There's even more bad news for warm-weather fans, Sosnowski added: "Arctic air is likely to get even more extensive by this weekend," he said, as the frigid air mass makes "a lunge into the south-central states and an eastward lunge through the Northeast."Although temperatures will not be as intensely cold as they are in the north, they will still be plenty cold, as much as 15 to 25 degrees below average for this time of year. Temperature records may be broken late this week into the weekend all the way from the Pacific Northwest into the Plains and Midwest, weather.com said. The pattern is tied to a disruption of the polar vortex, the Capital Weather Gang said, which has allowed lobes of cold to spill south to the mid-latitudes of North America: "Signs point to below-average temperatures being here to stay for much of the central United States through at least mid-February," the Gang said. The cold won't be the only calling card of the wintry outbreak. A "potentially significant ice storm" is forecast for parts of the central and eastern U. S. over the next few days, the weather service warned. Starting Tuesday evening, freezing rain could produce significant ice accumulations from portions of the mid-Mississippi Valley to the Ohio Valley into Friday, which will lead to hazardous travel, power outages and tree damage."As the storm moves eastward through Wednesday and Wednesday night, the threat for snow and ice will expand through the Ohio Valley," AccuWeather senior meteorologist Courtney Travis said.
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