Monday, January 31, 2022

90M Americans in path of next winter storm to streak across the US

 By Renee Duff, AccuWeather meteorologist

Published Jan. 30, 2022 12:20 PM EST Updated Jan. 31, 2022 5:46 PM EST








At least 90 million people across 14 states were under a winter storm watch or warning by Monday evening as the makings of a far-reaching, disruptive winter storm that will track over a 2,000-mile stretch of the United States.

AccuWeather Chief Meteorologist Jonathan Porter warned that not only will the storm impact the 90 million people in its path, but also retailers and consumers as weather conditions may slow down or even stop a few trucks from transporting goods through parts of the Central U.S. for a few days this week.

"We could be looking at a big mess in moving products to where people and businesses need them as a result of our latest winter storm, and this interruption in the supply chain may be felt for weeks," Porter said.

DenverDallas and Detroit are among the major metro areas expected to face wintry consequences and potential travel trouble, forecasters say. Major highway arteries across the Great Lakes and Ohio Valley southwestward into Missouri, Kansas, Arkansas and Texas may also be impacted, including parts of I-80, I-90, I-70, I-40 and even parts of I-20, according to AccuWeather Lead Storm Warning Meteorologist Billy Clark.

Winter and spring will be duking it out across the middle of the nation right around the time Punxsutawney Phil makes his highly anticipated forecast on Feb. 2, Groundhog Day. The clash of seasons will commence as a fresh wave of Arctic air dives southward into the northern Plains and warm, moist air from the Gulf of Mexico surges northward.

An expansive area of snow and ice, extending along an approximate 2,000-mile-long swath of the country, is expected to break out as early as Tuesday night from portions of Colorado and New Mexico to Kansas, Oklahoma, Missouri, Illinois, Indiana, and Michigan. By Wednesday night, the wintry hazards are forecast to expand farther south and east into Texas, Arkansas, and part of the lower Ohio Valley.

"Depending on the exact track of the storm, an extended zone of icing will develop from central Texas extending through the Ohio Valley. Areas like DallasLittle Rock, and Indianapolis could be under a significant ice threat around the middle of this week," AccuWeather Meteorologist Joe Bauer said.

"Any areas that receive significant icing from this storm can experience downed trees and power lines," Bauer said.

"A broad area of ice accretion of 0.25 to 0.50 of an inch is anticipated with this storm in the Central states and is serious enough, but there is the potential for 0.50 of an inch to 1 inch of accretion in some areas, which could be devastating to some communities," AccuWeather Senior Meteorologist Alex Sosnowski said.

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For some areas in this corridor, the period of icing could last 12-24 hours or more.

Travel will become extremely difficult and dangerous especially where freezing rain is the primary type of icy precipitation. Freezing rain creates a glaze of ice on untreated roads and sidewalks, and can cling to trees and power lines and lead to power outages. Widespread power outages are likely from Dallas to Columbus.

Just to the north and west of the icy corridor will be a zone of accumulating, plowable snowfall.

The heaviest snow is likely to fall across the central and southern Rockies where the AccuWeather Local StormMax™ of 36 inches is most likely to occur. But forecasters caution that even outside of the mountains, enough snow to cause slippery roadways and disruptions to daily routines will encompass a broad area.

"A swath of heavy snow accumulating in excess of 1-inch per hour could extend from portions of eastern Kansas through central Illinois, northern Indiana, southeast Michigan, and northwest Ohio, where totals of over 6 inches can occur," Bauer said.

Enough snow to shovel and plow is forecast throughout the Chicago area, but a tremendous variance in snowfall totals is expected from northwest to southeast across the metro area with the heaviest amount of snow likely to fall toward central Illinois and in northwestern Indiana.

Even portions of western Texas, such as Amarillo and Midland, and Oklahoma, including Oklahoma City, may not be spared from the storm's wintry side as ongoing mild weather is replaced by a harsh chill.

Temperatures can plummet 20 to 30 degrees over 24 hours across the South Central states, according to Bauer.

The preceding warmth in this part of the country will allow for any snow to initially melt on contact with roads and sidewalks. However, as the snow continues to fall and temperatures plummet, conditions can turn icy in a hurry.

The rush of cold air southward may be potent enough for some snow and ice to reach as far south as the Big Bend of Texas late Wednesday into Thursday.

During the middle of February 2021, Arctic air plunged deep into Texas along with multiple rounds of snow and ice that persisted for one to two weeks. The harsh wintry weather triggered lasting power outages, while roads in some areas resembled the Arctic tundra,” Sosnowski said, adding that temperatures are likely to bottom out 10-20 degrees higher compared to last February’s outbreak.

“While the amount snow and ice in some areas could rival that of a year ago, the areal coverage in the region should be significantly less and the pattern itself should not last more than a couple of days,” he said. “For example, temperatures are forecast to bottom out in the 20s around San Antonio and Austin later this week, compared to the lower teens and single digits last February. Where power outages occur, they could be long-lasting and some roads will be icy and dangerous for a time in the Lone Star State,” Sosnowski said.

The broad nature of the storm is expected to lead to significant delays for travelers both on the road and in the air. Airline passengers with arrival and departure flights or connections in DenverDallasSt. LouisChicagoDetroit, and Indianapolis should be prepared to face weather-related delays around the middle of the week.

In 2011, a storm on Groundhog Day brought immense snow and travel problems to Chicago. The Windy City may be right on the edge of significant snow accumulations with this storm, according to forecasters.

As the storm shifts toward the Eastern Seaboard late in the week, weather-related travel woes can directly affect some of the larger Northeast hubs. Unlike the latest bomb cyclone that dumped feet of snow, the upcoming storm is expected to bring a mixed bag of precipitation to the region.

AccuWeather meteorologists stress that even small changes in the track of the storm can have large implications on precipitation types and whether a location lies within the corridor of rain, steady snow, significant icing, or nuisance flurries and light snow. In addition, a push of dry air behind the storm could plunge farther south than currently anticipated, leading to lower snowfall amounts on the northern and western edges of precipitation.

"Both the press of Arctic cold and the sweep of dry air will be critical for all rain versus a change to ice and snow from the mid-Atlantic to southeastern New England spanning Thursday to Friday," Sosnowski said.

Forecasters say impacts from the storm will not just be of the wintry variety and that there could be a concern for severe weather as well. To the south and east of the corridor of icy mix, soaking rain and thunderstorms are likely.

"Heavy rain from eastern Texas through the Tennessee Valley and portions of the Southeast can lead to flash flooding and localized severe weather," Bauer said.

AccuWeather meteorologists will continue to monitor the latest trends with the storm and provide more details on exact timing, snowfall amounts and areas at risk for a dangerous ice storm in the coming days.

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Long-duration storm to threaten wintry mayhem in Northeast

 By Alex Sosnowski, AccuWeather senior meteorologist

Published Jan. 31, 2022 1:01 PM EST Updated Jan. 31, 2022 9:06 PM EST










Just days after a fast-moving blizzard buried the coastal Northeast with feet of snow and hurricane-force winds, a new and slower-moving storm expected to unleash significant snow, ice and rain over the central United States will spread over the region, including inland areas that were missed by the weekend storm, AccuWeather meteorologist warn.

But, first, the Arctic air will be retreating during the first part of this week in the northeastern United States, and that will allow temperatures to moderate. High temperatures in New York City and Boston are forecast to trend upward through the 30s F into Tuesday then the 40s on Wednesday and Thursday. Fifty-degree readings are likely in parts of the mid-Atlantic on Thursday. Normal highs for this time of year range from 45 in Washington, D.C., to 40 in New York City and 37 in Boston.

By midweek, a fresh surge of Arctic air will set up a major weather battle zone that will threaten a dangerous, but a narrow band of snow and ice and rain for some areas along a 2,200-mile-long swath from the southern Plains to the Midwest and Atlantic Canada. Wintry weather will occur in the Central states spanning Tuesday, Wednesday and Thursday, while areas in the Northeast will be affected by the storm with snow, ice and rain beginning on Wednesday and lasting into Friday.

"The press of the Arctic air is going to slow and stall, while at the same time a pair of storms will move northeastward along that temperature boundary," AccuWeather Chief On-Air Meteorologist Bernie Rayno said, adding that instead of wintry precipitation lasting 12 or 24 hours like with the recent storm in the East, snow and/or ice could continue for two days. The lengthy duration of the storm will add to its dangers.

The precipitation type for each location will depend not only on surface temperatures but also on how deep or shallow a layer of cold air becomes in the atmosphere. A very shallow layer of cold air at the surface or just above the ground will result in freezing rain and/or sleet, but a deeper layer of cold air will allow all or mostly snow to fall. Where the air is above freezing at the surface and through most layers of the atmosphere, rain will prevail.

With the expected stagnant setup, the form of precipitation may not change much in a given location, AccuWeather Meteorologist La Troy Thornton said.

"The extended period of wintry precipitation would lead to a heavy snowfall accumulation and a potentially damaging ice accretion across a relatively narrow, but long swath of the nation," Thornton explained.

Should the zone of snow hold its ground, there is the potential for 6-12 inches of snow to fall along the shores of lakes Erie and Ontario, as well as across much of the St. Lawrence Valley that borders the northeastern U.S. and southeastern Canada. Within this zone, there will be a band of 12-18 inches of snow accumulation with an AccuWeather Local StormMax™ of 30 inches. Parts of northern and western New York state are predicted to lie within that snow bull's-eye, forecasters say.

Overlapping and perhaps 100 miles or so to the south and east of the snow band will be a zone of ice. In the Northeast, this icy zone is projected to extend from part of eastern Ohio through northern and western Pennsylvania, the southern tier of New York state and part of the Hudson Valley through central New England and coastal Maine.

Where mostly sleet falls instead of freezing rain, problems may be limited to icy roads. However, where mostly freezing rain occurs, there is the risk of 0.25 to 0.50 of an inch of ice or more to adhere to trees and power lines, which can lead to major power outages in addition to dangerous travel.

Farther to the south and east, mild air is projected to move in and hold on, resulting in all or mostly rain falling from the mid-Atlantic to southeastern New England.

Normally, the expected 0.75 of an inch to 1.50 inches of rain would not cause significant problems in the region. However, the combination of above-freezing temperatures during both day and night, as well as the rain and melting snow will lead to flooding problems. Most of these problems are likely to be limited to urban areas where large piles of snow are clogging storm drains. AccuWeather meteorologists urge road crews and property owners to free up these areas to avoid street flooding.

Another potential flooding problem has to do with the long-lasting cold of late that has caused streams and rivers to freeze over or become clogged with ice. The duration of the thaw combined with rain can be enough to lead to ice-jam flooding in portions of the central Appalachians, mid-Atlantic and southeastern New England, AccuWeather Meteorologist Brandon Buckingham stated.

In areas near the Great Lakes, the northern tier of New York state and northern New England, few, if any, problems due to ice jam flooding are likely, as the air is likely to remain below freezing or only spend a brief amount of time above freezing this week.

Along with the risk of minor flooding will be another potential travel problem for areas where temperatures climb above or approach the freezing mark. Airline passengers should anticipate flight delays and cancellations due to the extent of snow and ice around major central U.S. hubs of DallasChicagoSt. Louis and Detroit. This alone will displace crews and aircraft, and another threat--fog--could become an issue that results in flight delays at some of the major and secondary airports in the Northeast, as well as creating tricky travel on roads.

A potential wildcard in the wintry setup

Current forecasts reflect the most likely outcome of the storm and the primary form of precipitation for the Northeast. However, there is a chance that the latter part of the storm may yet bring significant ice and snow to the mid-Atlantic and southern New England, should cold air manage to advance sooner rather than later.

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Historically speaking, it is very rare for rain to change to ice east of the Appalachians in the mid-Atlantic and southern New England.

"The vast majority of the time, the rain ends as dry and cold air sweeps in, or once in a while rain can end as a brief period of snow if moisture lingers for a few hours," AccuWeather Senior Meteorologist Joe Lundberg said.

In this case, meteorologists will have to watch the behavior of the double-barreled storm closely. If the first storm becomes a bit stronger than anticipated at this time, it could pull colder air farther to the south and east in the region just past midweek.

Such a southeastward shift in the storm's track could deposit more cold air in its wake, and the second storm currently projected to extend rainfall for another 24 hours could instead trigger accumulating snow from Thursday to Thursday night and early Friday in part of the zone from Harrisburg, Pennsylvania, to New York City and Boston.

Just south of this zone, at roughly the same time, such a scenario could lead to ice in northern Virginia, and Maryland to New Jersey, Long Island, New York, and southern New England.

This same, more forceful cold press could then force the zone of heaviest snow farther to the southeast across the central Appalachians to central and northern New England, instead of across the eastern Great Lakes and St. Lawrence River Valley.

Regardless of how the storm unfolds across the mid-Atlantic and southern New England, portions of the central Appalachians, eastern Great Lakes and northern New England will be a wintry mess with major travel disruptions from Wednesday to Friday. AccuWeather forecasters say travelers along highways such as Interstates 20, 40, 70, 80 and 90 should expect major weather-related problems.

More to read:

For the latest weather news check back on AccuWeather.com. Watch the AccuWeather Network on DIRECTVFrontierSpectrumfuboTVPhilo, and Verizon Fios. AccuWeather Now is now available on your preferred streaming platform.

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