Winter storm updates: Dozens dead across US in wake of massive snowfall, deep freeze

The storm begins Friday afternoon with snow and ice in New Mexico and the Texas panhandle. By the evening, Dallas will see a wintry mix and Oklahoma City will see some snow.

Saturday is the most significant day for dangerous icing and heavy snow for the South.

On Saturday morning, the snow and ice will be stretching from Texas to Arkansas to Tennessee.

By Saturday afternoon, snow will be falling from St. Louis, to Indianapolis, to Cincinnati, to Charleston, West Virginia.

By Saturday evening, the snow and ice will cover a massive part of the country, stretching from New Mexico to the Carolinas.

Further south, a wintry mix or freezing rain will be hitting Dallas, Shreveport, Louisiana, Memphis, Tennessee, and Raleigh, North Carolina.

The storm will move east early Sunday, bringing snow from Wichita, Kansas, to Cincinnati, to Washington, D.C., to Philadelphia.

Freezing rain will be likely by sunrise in Houston, Memphis, Atlanta and Raleigh.

By noon, the snow will reach New York City, while the snow in D.C. will warm to a wintry mix.

It’s not yet clear which parts of the Interstate 95 corridor will get a wintry mix and which will get all snow on Sunday afternoon. But most of New England and the interior Northeast will see all snow on Sunday and early Monday.

A wide swath of plowable snow -- 3 to 6 inches -- is forecast from New Mexico through the Ohio Valley and up to Maine.

The heaviest snow is expected to be from the Texas panhandle to southern Missouri, as well as from the Ohio Valley to the Appalachian Mountains and New England.

In the Northeast, a large swath of the region could see over 1 foot of snow, with 6 to 12 inches forecast closer to the coast, from Virginia to southern New England coast. New York City’s latest forecast shows 8 to 12 inches.

-ABC News' Kyle David and Dan Peck

The Federal Emergency Management Agency is staging resources ahead of the storm, including prepositioning supplies and equipment, according to an internal planning document reviewed by ABC News.

At Camp Minden in Louisiana, FEMA is staging 250,000 meals, 400,000 liters of water and 30 generators, according to the document.

Incident management teams are on standby and FEMA has activated the National Response Coordination Center, the document said.

Twenty-eight Urban Search and Rescue teams are on standby, ready to deploy and support lifesaving operations at the request of governors, according to the document.

-ABC News’ Luke Barr

Washington, D.C., has joined 14 states in declaring a state of emergency as the city prepares for ice and the "largest snowfall we've seen in a long time," Mayor Muriel Bowser said Friday.

"Current projections have at least nine inches of snow falling, with the potential for more," Bowser said. "There is a possibility of freezing rain overnight Sunday into Monday, which will increase hazardous conditions."

Bowser said the city is "requesting vehicle support from the D.C. National Guard to ensure our first responders are able to move around."

D.C. public schools were already scheduled to close on Monday for a professional development day for staff.

-ABC News’ Beatrice Peterson

Dangerously cold temperatures are impacting nearly half of the country, including many areas outside of the winter storm. More than 50 million people are on alert for extreme cold, from Minneapolis to Chicago to Dallas to Houston.

The wind chill -- what temperature it feels like – neared minus 40 degrees in Minneapolis and minus 30 degrees in Chicago on Friday morning. In these conditions, it takes as little as 10 minutes for frostbite to develop.

In the South, cities including Dallas, Little Rock, Arkansas, and Memphis, Tennessee, will have bitterly cold temperatures well after this weekend’s storm passes. And since the storm could cause prolonged power outages, people could be left without crucial heating during the arctic blast.

-ABC News’ Kyle David