Mid-Atlantic braces for snow as renewed flood concerns in the South put millions on edge

Heavy rain is back across the Southeast on Thursday, dropping more precipitation over swollen rivers and flooded communities that are already saturated after constant rounds of rain over the past two weeks.

The National Weather Service has issued flash flood watches and flood warnings for 14 million people from northeast Louisiana through central Georgia. In these areas, an additional 1-1½ inches of rain could fall through Thursday night.

Nearly 150 river gauges remained above flood stage Thursday morning, with this number expected to increase due to the additional rainfall. Rivers are expected to stay high through next week, as all the water slowly drains downstream toward the Gulf of Mexico. 

RELATED: Take a look at the winter weather in the U.S. in 2019: 

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Winter storms and weather across the United States 2019
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Winter storms and weather across the United States 2019
James Spanos pushes a cart of his belongings on a snow-covered street during a winter storm, Sunday, Jan. 20, 2019, in Portland, Maine. Scarves, hoods and gloves were necessary for New England residents venturing outdoors as the region endures a storm that can dump up to 18 inches of snow. (AP Photo/Robert F. Bukaty)
Horses stand over a major winter storm which dropped around 8 inches of snow in Taos, New Mexico, U.S., January 11, 2019. REUTERS/Andrew Hay
Caleb Seely rides a unicycle on a snow covered sidewalk as he heads home after helping shovel out his brother's driveway during a winter storm, Sunday, Jan. 20, 2019, in Portland, Maine. The extra knobby tire on Seely's ride provided traction on a day when snow, sleet and freezing rain kept most motorists indoors. Parts of New England residents are bracing for up to 18 inches of snow. (AP Photo/Robert F. Bukaty)
Traffic moved through the town center after a major winter storm dropped around 8 inches of snow in Taos, New Mexico, U.S., January 11, 2019. REUTERS/Andrew Hay
Don Locke, of Pottsville, Pa., clears snow and ice from his car along 12th Street in Pottsville, Pa., on Sunday, January 20, 2019. (Andy Matsko/The Republican-Herald via AP)
A couple takes photos at the frozen fountain in Bryant Park January 11, 2019 in New York. New York City was hit with bitter temperatures and high winds. - The low for Friday was 22 Farenheit (-5.5 Celsius) (Photo by Don EMMERT / AFP) (Photo credit should read DON EMMERT/AFP/Getty Images)
Motorists try to fix their windshield wipers during a winter storm, Sunday, Jan. 20, 2019, in Portland, Maine. Snow, sleet and freezing rain is making travel hazardous throughout much of New England. (AP Photo/Robert F. Bukaty)
People take photos of the frozen fountain in Bryant Park on January 11, 2019 in New York. New York City was hit with bitter temperatures and high winds. - The low for Friday was 22 Farenheit (-5.5 Celsius) (Photo by Don EMMERT / AFP) (Photo credit should read DON EMMERT/AFP/Getty Images)
Crews clear snow at the Albany International Airport in Colonie, N.Y., Sunday, Jan. 20, 2019. A major winter storm that blanketed much of the Midwest with snow earlier in the weekend is barreling toward New England, where it is expected to wreak transportation havoc from slick and clogged roads to hundreds of canceled airline flights. (AP Photo/Hans Pennink)
Birds play in the frozen fountain in Bryant Park January 11, 2019 in New York. New York City was hit with bitter temperatures and high winds. The low for Friday was 22 Farenheit (-5.5 Celsius) (Photo by Don EMMERT / AFP) (Photo credit should read DON EMMERT/AFP/Getty Images)
Lakewood CO - JANUARY 11: Meredith Mills pushes shopping carts back into King Soppers on January 11, 2019 in Lakewood, Colorado. Snow continues to fall in the metro area. (Photo by RJ Sangosti/The Denver Post via Getty Images)
SILVER SPRING, MD - JAN 9: Emmi Horne, 8, tries to catch snowflakes on her toungue as she walks through downtown Silver Spring, Maryland during a brief snow squall with her mom, Terry Horne, right. (Photo by Bill O'Leary/The Washington Post via Getty Images)
BOSTON, MA - JANUARY 8: A pedestrian passes through a light dusting of snow on a Columbia Road sidewalk in the Dorchester neighborhood of Boston on Jan. 8, 2019. (Photo by Jonathan Wiggs/The Boston Globe via Getty Images)
Waves from the East River are seen in front of the Brooklyn Bridge and the skyline of Manhattan in New York on January 7, 2019. (Photo by Johannes EISELE / AFP) (Photo credit should read JOHANNES EISELE/AFP/Getty Images)
Keith Morris, of the City of Owensboro's Street Department, takes off a hose after loading 1,000 gallons of salt brine into a tank on a truck, Friday afternoon, Jan. 11, 2019, so it can be spread on city roads in Owensboro, Ky. The National Weather Service had issued a winter weather advisory on Friday of accumulating snow moving into the area Friday evening into early Saturday. (Alan Warren/The Messenger-Inquirer via AP)
Traffic moves along I-70 near Lawrence, Kan., Friday, Jan. 11, 2019 ahead of an expected snow storm. The area is under a Winter Weather Advisory. (AP Photo/Orlin Wagner)
A plow treats Douglas County Road 438 near Lawrence, Kan., Friday, Jan. 11, 2019 ahead of an expected snow storm. The area is under a Winter Weather Advisory. (AP Photo/Orlin Wagner)
A pedestrian walks across the street in downtown Scranton, Pa., on Sunday, Jan. 20, 2019. A major winter storm brought some of the coldest temperatures of the season and covered a large swath of the country in snow as it wreaked havoc on air travel and caused slick road conditions throughout New England Sunday. (Butch Comegys/The Times-Tribune via AP)
Marvin Hooks wears a face mask to protect him from the cold as he walks on North Street in Pittsfield, Mass., Monday, Jan. 21, 2019. Bitter cold and gusty winds swept across the eastern U.S. Monday with falling temperatures replacing the weekend's falling snow. (Ben Garver/The Berkshire Eagle via AP)
A runner moves through West Park on the Northside of Pittsburgh on Sunday, Jan. 20, 2019. A major winter storm brought some of the coldest temperatures of the season and covered a large swath of the country in snow as it wreaked havoc on air travel and caused slick road conditions throughout New England Sunday. (AP Photo/Gene J. Puskar)
Dan Cappella, of Pottsville, Pa., clears snow away on Howard Avenue in Pottsville, Pa., on Sunday, January 20, 2019. (Andy Matsko/The Republican-Herald via AP)
Ben Jennings snowblows his driveway on Sunday, Jan. 20, in Glenville, N.Y., where 16 inches of snow fell from Saturday evening through noon Sunday. (AP Photo/Mary Esch)
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As a batch of rainfall moves east Thursday, it will clash with cold arctic air during the afternoon and evening hours and switch to snow that could fall from eastern Tennessee, to northern South Carolina, much of North Carolina and up through southern Virginia. For cities such as Charlotte and Raleigh, the switch to snow just before or during the Thursday evening rush hour could cause travel issues.

About 1-3 inches of snow is possible from eastern Tennessee through North Carolina and up through southeastern Virginia. Locally higher amounts are possible in some areas.

For this wintry potential, the weather service has issued winter weather alerts for 15 million people across northeast Georgia, central Tennessee, northern South Carolina, all of North Carolina and southern Virginia.

Warm ground temperatures could initially prevent snow from sticking, which could impact snow totals. The exact timing of the switch from rain to snow will also influence total snow accumulation. The snow will last overnight Thursday into early Friday morning, but be finished just after sunrise Friday.

The last time Charlotte, Raleigh and Norfolk picked up 1 inch or more of snow was 2018.

The cold air that will play a role in Thursday's Mid-Atlantic snow is part of an arctic air mass engulfing much of the eastern half of the continental United States. Wind chill alerts are up for parts of North Dakota, South Dakota, Minnesota and Iowa for wind chills as cold as 35 degrees below zero. Highs Thursday will be 10-25 degrees below average for nearly everyone east of the Rockies. The only exception is the Florida Peninsula. These below-average temperatures will last through Friday, before temperatures rebound over the weekend.

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