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Pre-Christmas storm threatens major travel delays across US

By Alex Sosnowski, AccuWeather senior meteorologist

Published Dec 16, 2022 11:58 AM EDT | Updated Dec 20, 2022 12:23 PM EDT

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AccuWeather forecasters warn that a major winter storm will bring snow and blizzard conditions to the U.S. in the days leading up to Christmas.

Confidence continued to grow among AccuWeather's expert team of meteorologists on Monday that a significant storm would evolve later this week, threatening to bring a wide swath of snow, rain and fierce winds from the Plains to the Atlantic Seaboard.

The intensifying storm will coincide with a surge of frigid air that will send temperatures to bone-chilling levels through the holiday weekend and could be one of the most intense and prolonged periods of Arctic air in decades during Christmastime. The plummeting temperatures with the storm could also lead to concerns of a rapid freeze-up.

The storm’s timing could not be worse given the increased number of travelers leading up to Christmas as well as the pressure retailers and shipping companies face to keep shelves stocked and items on track for delivery.

Snow during at least part of the storm is likely to extend from parts of the southern Plains to the Midwest, Northeast and perhaps even the interior Southeast states during the period from Thursday, Dec. 22 to Saturday, Dec. 24. The first stage of the storm can cause snow to break out as early as Wednesday across the interior West, with Denver expected to pick up several inches of accumulation Wednesday night.

AccuWeather's team of long-range meteorologists, led by Senior Meteorologist Paul Pastelok, not only looks at computer models but also examines existing global weather patterns, known as teleconnections. The team has been keeping a close eye on the potential for this storm and the geographical area at risk since the start of December.

"At this time, there is every indication to believe that a major storm will unfold and track from somewhere over the South Central states to the Northeast," Pastelok said.

The track is key to which areas end up with the heaviest snow, but confidence is also growing that even a small or moderate amount of snow when combined with plunging temperatures and strong winds will lead to a quick freeze-up and slippery travel from parts of the south-central Plains to the Midwest and Northeast states.

This means that cities such as St. Louis and Nashville, and perhaps as far south as Dallas and Atlanta could be looking at some snow, as well as the more traditional wintry trouble spots farther north such as Chicago, Detroit and Pittsburgh.

"This is the type of setup that can lead to ground blizzards in parts of the Central states," AccuWeather Senior Long-Range Meteorologist Joe Lundberg said when he considered the potential storm's intensity, the arrival of Arctic air and the wide open terrain in the region.

"This storm will likely become intense, feeding on the extremely sharp variation between the surging arctic air arriving from the Central states and relatively warm air across the southeastern U.S.," AccuWeather Chief Meteorologist Jon Porter said. "Major East Coast storms over the decades have occurred in this type of setup, bringing the risk for heavy snow and rain, gusty winds, coastal flooding, severe thunderstorms and even tornadoes on the southern side of the storm."

AccuWeather's Chief On-Air Meteorologist Bernie Rayno has summarized the major impacts of the coming storm and cold this week.

One such key component will be the complex structure of the storm. For example, one storm center may track toward the Great Lakes and a second storm center may form over the Appalachians or right along the Atlantic coast late this week. This could allow for hazardous winter weather to develop over an especially large area, making impacts around the Christmas holiday even worse.

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The secondary storm formation could be a determining factor in the primary form of precipitation expected in the major metro areas of Washington, D.C., Baltimore, Philadelphia, New York City and Boston. At this time, at least some snow or a wintry mix are still on the table for these locations for part of the storm.

"The exact track of the storm will dictate which areas receive heavy snow versus heavy rain and the most significant impacts, but people and businesses in the eastern U.S., especially those traveling, should be extra alert and frequently check AccuWeather forecasts this week to stay updated on expected impacts," Porter added.

Even locations on the warmer east side of the storm may not be entirely out of the woods when it comes to wintry weather. With Arctic, frigid air quickly spilling in, temperatures may drop sharply as the storm is ongoing, potentially changing any rain over to snow. Just when and where this occurs depends on the storm's exact intensity.

For those who find themselves with some added flexibility in terms of available time for travel or shopping, forecasters say it could be advantageous to adjust certain plans before the storm’s peak impacts late this week and into the Christmas weekend. The storm’s enormous scope and intensity have the potential to leave people stranded on the highways and at the airports. Even if an airport is not in the storm’s primary target zone, delays at other travel hubs could cause a cascading effect in case aircraft and crews become displaced.

While the storm may initially delay the arrival of very cold air along the Eastern Seaboard, the frigid air is likely to plunge southeastward in the storm system’s wake. Those who will be away from home around Christmas may want to take precautions to avoid having their pipes freeze and potential water damage even in portions of the interstate 20 and 10 corridors of the South Central and Southeastern states, experts say.

AccuWeather's team of more than 100 meteorologists will continue to fine-tune the forecast for this emerging storm system in the days ahead.

In other news:

Where is Blizzard Alley?
Blizzard of 1996 snow was so deep, city had to dump it off bridges
Blizzard halts travel, stranding hundreds across the northern Plains

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