Millions of Americans brace for potentially catastrophic ice storm. What to know, by the numbers

ATLANTA — Millions of Americans from New Mexico to the Carolinas are bracing for a potentially catastrophic ice storm that could crush trees and power lines and knock out power for days, while many northern states all the way to New England could see enough snow to make travel nearly impossible, forecasters say.

An estimated 100 million people were under some type of winter weather watch, warning or advisory on Wednesday ahead of the storm, the National Weather Service said.

The storm, expected to begin Friday and continue through the weekend, is also projected to bring heavy snow and all types of wintry precipitation, including freezing rain and sleet. An atmospheric river of moisture could be in place by the weekend, pulling precipitation across Texas and other states along the Gulf Coast and continuing across Georgia and the Carolinas, forecasters said.

Here's a look at the approaching storm and how people are preparing for it, by the numbers:

0

The number of snowplows owned by the city of Jackson, Mississippi, where a mix of ice and sleet is possible this weekend. The city uses other heavy machinery like skid steers and small excavators to clear roads, said James Caldwell, deputy director of public works. Jackson also has three trucks that carry salt and sand to spread across roads before freezing weather.

0.5

1

The number of Nashville snowplows named after country music legend and Tennessee native Dolly Parton (Dolly Plowton). Another snowplow in East Tennessee was named Snowlene after her classic hit song ''Jolene'' as part of a 2022 naming contest.

3

The number of layers needed to keep warm in extreme cold. AP video journalist Mark Vancleave in Minnesota explains the benefits of all three — a base layer, a middle layer and an outer shell — in this video.

4

12

The number of inches of snow that could fall in parts of Oklahoma.

''You've got to be very weather aware, and real smart about what you're doing,'' said Charles Daniel, who drives a semitrailer across western Oklahoma.

"One mistake can literally kill somebody, so you have to use your head,'' he added.

15

19

Parts of at least 19 states in the storm's path were under winter storm watches by late Wednesday, with more watches and warnings expected as the system approaches. They include Texas, New Mexico, Oklahoma, Kansas, Missouri, Arkansas, Louisiana, Mississippi, Alabama, Georgia, Tennessee, North Carolina, South Carolina, Kentucky, Indiana, Illinois, Ohio, Virginia and West Virginia. An estimated 55 million people are included in these winter storm watches, the weather service said.

32

The degree in Fahrenheit when water freezes, equivalent to 0 Celsius. This is a magic number when it comes to winter weather, said Eric Guillot, a scientist at the National Weather Service. If the temperature is slightly above 32, it will be mostly liquid. But the colder it is below the mark, the more efficiently precipitation will freeze.

45

50 Below Zero

The windchill value — how cold it feels to a person when winds are factored in — that is expected in parts of the Northern Plains, the weather service projects. That equates to minus 45.6 Celsius and is forecast for parts of northern Minnesota and North Dakota.

"When the weather forecast says, ‘feels like negative 34,' it's just a matter of covering skin and being prepared for it,'' said Nils Anderson, who owns Duluth Gear Exchange, an outdoor equipment store in Duluth, Minnesota.

330

The number of snowplows in the city of Chicago, where annual snowfall averages 37 to 39 inches (0.94 to 0.99 meters). The city also has 40 4x4 vehicles, and about 12 beet juice-dispensing trucks, according to Cole Stallard, Chicago's commissioner of Streets and Sanitation. The natural sugars of beet juice lower the freezing point of water, allowing salt mixtures to work at much lower temperatures and preventing refreezing, while also helping salt stick to the road longer.

The number of miles added last year to snowplow routes in Nashville, Tennessee. That was done "to get deeper into our neighborhoods — roads that had never been plowed before,'' said Alex Apple, a spokesperson for Nashville Mayor Freddie O'Connell.

1,000-plus

Texas has this number of pieces of winter weather equipment, including snowplows, motor graders and brine tankers, Texas Department of Transportation spokesperson Adam Hammons said. He said the agency also works with state partners and contractors to get more equipment when needed. In the Dallas area, "right now our main focus is treating our roadways in advance of the storm,'' agency spokesperson Tony Hartzel said Wednesday.

78,000

The number of cubic yards of salt on hand at the Arkansas Department of Transportation. The state has 121 salt houses around the Arkansas, plus 600 salt spreaders and 700 snowplows, said Dave Parker, an agency spokesperson.