Atmospheric river on the way for PNW, a polar vortex shift will unleash more bitter cold, and Mount Washington blasted by 120-mph winds

AccuWeather Daily

Successive storms early this week and beyond will trigger flooding, landslides and high winds in the mountains, with impacts that may cascade into regional air and highway travel through the busy holiday period.

More Arctic air is building over northern Canada and will be directed into the United States, courtesy of the polar vortex. How long will the cold waves last? Will it stay cold through Christmas?

AccuWeather RealFeel® Temperatures plunged to 73 below zero atop New Hampshire’s tallest mountain Thursday night as a storm roared through the Northeast.

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2025-12-08 7 min

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