Dallas could see 1 to 4 inches of snow -- and more power outages are expected.

Austin to Houston to Louisiana could see ice accumulation and very treacherous travel Wednesday morning.

Severe storms are possible along the Gulf Coast from New Orleans to Pensacola on Wednesday night.

The snow and ice will continue to move into the Ohio Valley and the mid-Atlantic overnight Wednesday and into Thursday morning.

The South is also enduring a record-breaking cold snap.

Here's something you don't see everyday... check out the scenes from Seawall Blvd in Galveston this morning. 🌨😱#LoveGalveston | https://t.co/uijbAAlsPD. pic.twitter.com/eLp53DPclU

— Galveston Island (@GalvestonIsland) February 15, 2021

Synchronized snow plowing is a thing! Removing snow from the barrier wall keeps the left shoulder clear for emergency use & keeps drainage boxes unclogged. Watch #KYTCsnowfighters clear the barrier wall on I-75 in Fayette Co. Please be patient as trucks move through. #kywx pic.twitter.com/64DWen5rGM

— KYTC (@KYTC) February 15, 2021

Oklahoma City fell to minus 14 degrees Tuesday -- the coldest since 1899.

In Lawton, Oklahoma, the temperature plunged to minus 12 degrees Tuesday -- an all-time record low.

The temperature in Dallas fell to minus 2 degrees -- the coldest since 1949.

\"PHOTO:
Jerry Larson/AP
PHOTO: People push a car free after spinning out in the snow on Feb. 15, 2021, in Waco, Texas.
>

Texas vaccine shipments are on hold because of the storm.

\"PHOTO:
Greg Jaklewicz/Reporter-News/USA Today Network via Reuters
PHOTO: Military vehicles from the Texas Military Department of the Texas National Guard, tasked to transport residents to designated warming centers and other required duties, form a convoy in Abilene, Texas, Feb. 16, 2021.
>

Texas' Department of State Health Services said, \"due to the winter storm and dangerous conditions, the CDC has put vaccine shipments on hold. We are not expecting deliveries to occur until at least Wednesday. Many local vaccine providers have postponed clinics since it is not safe for people to be out across much of Texas right now. Vaccination will resume as soon as it is safe and local conditions allow.\"

\"PHOTO:
Montinique Monroe/Getty Images
PHOTO: Cars drive Northbound on a snow covered I-35 on Feb. 15, 2021, in Austin, Texas.
>
\"PHOTO:
Montinique Monroe/Getty Images
PHOTO: Pedestrians walk on along a snow-covered street on Feb. 15, 2021, in Austin, Texas.
>

Publix, the major supermarket chain in Florida, is canceling all vaccine events at their stores in Florida on Wednesday due to weather.

At least 17 other states have delayed or canceled some vaccinations: Alabama, Georgia, Illinois, Indiana, Kansas, Kentucky, Louisiana, Maine, Michigan, Mississippi, Missouri, New Hampshire, Ohio, Oklahoma, Oregon, Pennsylvania and Tennessee.

On Thursday the storm will move through the mid-Atlantic and Northeast. Accumulating ice is possible from Raleigh to Richmond, while heavy snow could hit Washington, D.C., Philadelphia and New York City.

D.C. could see 5 inches of snow, sleet and ice.

Philadelphia may get 3 to 6 inches of snow, with 6 inches to 1 foot in the suburbs.

New York City is forecast to see 4 to 8 inches of snow, with 6 inches to 1 foot in the suburbs north and west of the city.

Meanwhile, Monday night, a storm brought several reported tornadoes to Florida, Georgia and North Carolina.

\"PHOTO:
James Lee/The News & Observer via AP
PHOTO: Fallen trees litter the ground after a tornado tore through a residential area of Brunswick County, N.C., Feb. 16, 2021.
>

Three people were killed from the reported twister in North Carolina, Gov. Roy Cooper said.

\"PHOTO:
Brunswick County Sheriffs Office via AP
PHOTO: A man surveys the damage after a deadly tornado tore through Brunswick County, N.C., Feb. 16, 2021.
>
\"PHOTO:
Brunswick County Sheriffs Office via AP
PHOTO: A damaged vehicle sits among debris after a deadly tornado tore through Brunswick County, N.C., Feb. 16, 2021.
>

At least 20 people have died due to the storm, according to The Associated Press, including nine in Texas.

President Joe Biden had a phone call with several governors of the states affected by the weather, including Texas Gov. Greg Abbott and Louisiana Gov. John Bel Edwards, the White House said Tuesday evening.

Biden said the administration was \"prepared to assist and stands ready to respond to requests for Federal assistance from the governors and will deploy any additional Federal emergency resources available to assist the residents of their states in getting through this historic storm.\"

ABC News' Ben Gittleson contributed to this report.

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