A massive surge of Arctic air is poised to sweep across the central and eastern United States this weekend, bringing what forecasters are calling the “mother lode” of cold before a warmer pattern takes hold ahead of the holidays.
The incoming blast, described by meteorologists as rivaling the intensity of recent polar vortex disruptions, has been building over northern Canada. Temperatures in the source region have plummeted to between 20 and 30 degrees below zero, creating a reservoir of frigid air that is now rolling southeast.
“This is the mother lode of cold air and is a term I don’t use lightly,” said AccuWeather Chief On-Air Meteorologist Bernie Rayno.
The impact will be most severe across the Midwest, the Tennessee Valley, and the Appalachians, where residents should prepare for the coldest air of the season so far. In Minneapolis, daytime highs may fail to break zero, with overnight lows plunging to 20 below on Friday and Saturday nights.
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When factoring in blustery winds, AccuWeather warns that RealFeel® temperatures could drop significantly lower, creating a situation where frostbite or hypothermia can set in within 30 minutes for anyone caught outside without proper shelter.
Chicago is also in the crosshairs, with temperatures expected to struggle into the single digits on Saturday before dropping well below zero overnight. Forecasters expect the “RealFeel” in the city to remain sub-zero throughout the entire weekend.
While the densest cold air may struggle to fully cross the Appalachian Mountains, major East Coast cities from Washington, D.C., to Boston will likely see temperatures dip near or below the lows experienced earlier this week. If a storm system brings snow to the region later in the weekend, it could further depress temperatures along the Eastern Seaboard.
The bitter cold is expected to strain infrastructure and budgets alike. Paul Pastelok, AccuWeather’s Lead Long-Range Meteorologist, noted that millions of families will face high heating bills as furnaces work overtime to combat the freeze. In unheated spaces, property owners face a heightened risk of frozen and bursting pipes.
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A Shift Before the Holidays
Despite the severity of the weekend forecast, the deep freeze is not expected to lock in through Christmas. Meteorologists see a shift in the weather pattern beginning next week that will help scour out the coldest air.
“While it may feel like Christmastime already with the cold and snow, the bitterly cold pattern is not expected to last through the holidays,” Pastelok said.
The pattern is predicted to flatten out into a west-to-east flow, eroding the snow cover currently being built up by clipper systems. While some bursts of cold air may still linger in central and eastern states, they aren’t expected to match the intensity of this mid-December outbreak.
For winter sports enthusiasts, the message is to act quickly. Pastelok advised skiers and snowboarders to take advantage of the current conditions in the Appalachians, warning that the incoming warmer air could deteriorate slope conditions during Christmas week.
Until the pattern breaks, warmth will be hard to find in the continental U.S., restricted mostly to the Florida Peninsula and areas west of the Rockies.
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