Dangerously cold air has sent temperatures plummeting into the single digits around the U.S., with wind chills driving them even lower. Throw in the snow some areas are getting and you’ve got a bone chilling mix that may also be super messy.

Dangerously cold air has sent temperatures plummeting into the single digits around the U.S., with wind chills driving them even lower. Throw in the snow some areas are getting and you’ve got a bone chilling mix that may also be super messy.

The result?

School delays and cancellations, a fatal car pileup and worries about the homeless.

Here’s a look at what’s happening:

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A PILEUP IN WHITEOUT CONDITIONS

An 18-vehicle pileup that happened in whiteout conditions on a western Pennsylvania interstate has left two people dead and nearly two dozen injured.

Nine trucks, several of them tractor-trailers, and nine cars were involved in the crash Wednesday afternoon on Interstate 80 in Clarion Township, state police said. At least one of the trucks was carrying hazardous material, but no leaks were found.

None of the injuries was thought to be life-threatening, but three of the approximately 20 people taken to the hospital appeared to have serious injuries. The others were treated for everything from bumps to broken bones.

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TODDLER LEFT ALONE IN COLD CAR

Police believe a toddler was left alone in a car for hours in near-freezing temperatures in Spokane.

The boy was found Tuesday after a service station clerk called police. The father had stopped in the station and mentioned he forgot where he parked his car with his son inside.

Officers found the car near Comstock Park. It was 33 degrees outside. The boy was shivering.

The Spokesman-Review reports he was treated at a hospital and placed in the custody of Child Protective Services.

The father, 51-year-old Charles B. Fife of Spokane, was arrested for investigation of child abandonment. He appeared in court Wednesday and was held on $2,500 bail.

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DELAYING AND CANCELING SCHOOL

School districts from the South to the Northeast and Midwest delayed the start of classes or canceled school altogether.

Wind-chill readings were at or below zero in such places as Alabama and North Carolina, along with a chunk of the Midwest, the Plains and the Northeast. The wind chill was minus-40 in Saranac Lake in upstate New York on Thursday morning.

In northwest Georgia, schools in Catoosa County had a two-hour delayed start on Thursday because of temperatures expected to top out at 27 degrees and dip as low as minus 2 degrees with wind chills.

Many other cities modified school schedules, including Detroit, where it was 3 degrees early Thursday. Students got the day off Thursday at Detroit Public Schools, the state’s largest district, and at many other districts around Michigan.

School districts also closed schools in Illinois, Indiana, Kentucky, Tennessee, Alabama, Pennsylvania and Maine.

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COMMUTER FRUSTRATION

Below-freezing temperatures in the nation’s capital are causing headaches for commuters.

In all, there were delays on five of the Metro system’s six lines Thursday morning.

The Washington transit agency says the system’s red line was delayed in both directions because of weather-related equipment problems on train cars. The other four lines were delayed because of broken or cracked rails.

Commuters vented their frustration on Twitter, with many posts including photos of stations and trains jam-packed with people. One Twitter user wrote that he loves being told to avoid lines that have delays, adding, “OK, I’ll just move my house and job for the day.”

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GETTING WORSE BEFORE BETTER

Another Alberta clipper barreling down from Canada is bringing more bad winter weather to the Dakotas.

The National Weather Service has posted a variety of blizzard and winter weather advisories, watches and warnings for the Dakotas through Thursday. Not a lot of snow is expected, but winds gusting to 50 mph will blow around the snow that’s on the ground.

In Minnesota, forecasters expect blizzard conditions to develop in a portion of the River Valley. Weather officials say wind gusts of 40 to 50 mph combined with fresh snow will significantly reduce visibility, especially in open, rural areas. A blizzard warning was posted in an area from Granite Falls southeast to Mankato and Albert Lea.

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FATALITY IN MICHIGAN

An 85-year-old man crossing a northern Michigan road to get his mail was struck and killed by a car in snowy conditions.

It happened Wednesday in Helena Township, 30 miles northeast of Traverse City. The sheriff’s office says 51-year-old driver Tom Dollar reported “white-out” conditions at the time.

The victim was identified as Carl Dewey

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KEEPING RESIDENTS WARM

Many cities experiencing cold weather have opened warming stations for residents lacking heat. But extra care is being taken to protect the homeless.

In New Jersey, some officials have empowered law enforcement to move homeless people off the streets and into shelters.

Blankets were being given out at some of the 15 small tent cities around Huntsville, Alabama. Workers from a nonprofit organization there encouraged residents of the encampments to come inside. Some people planned to stay at a church that was opening as a shelter.

“We’ve got snow flurries as the temperatures continue to drop so they’re coming in,” said Clete Wetli, executive director of First Stop Inc., which provides transportation, mental health counseling and other services to the homeless. “The last thing we want is for someone to get hypothermia or die of frostbite.”

Officials in Ohio and Georgia warned residents never to use their kitchen ovens or stoves to heat their homes. It could prove deadly.

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A DOG’S TALE

A California couple is thanking animal control officers who rescued their dog after it spent 25 hours wandering in bitter cold after a housekeeper accidentally released the pooch from their Indiana hotel room.

The 3 1/2 -year-old Belgian Malinois named Sahara is back with Nick Hoeh and Rick Dunkle after her ordeal in Lafayette, Indiana, where the couple recently moved from California.

Animal control officers found the shivering canine Wednesday in a Lafayette resident’s backyard following several sightings.

A hotel housekeeper accidentally released Sahara from the couple’s hotel room Tuesday. The couple is staying at that hotel because a burst pipe damaged the new Lafayette home they had just purchased. The couple had saved Sahara from an abusive home

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THERE IS A BRIGHT SIDE

Temperatures have dropped to zero or below in southern New England and to 7 above in New York City, with wind chills getting into the minus-20s in some places. But little or no snow is forecast for most of the Northeast.

Around this time last year, parts of the region were digging out from 2 feet of snow accompanied by brutal polar air.

In fact, this season’s snowfall totals are way down from last year, one of the snowiest seasons on record.

Last year, Philadelphia, New York and Boston all got around 5 feet of snow from December through February, or about 1 1/2 to 2 1/2 feet more than normal. This year, they’ve seen only a few inches of snow since Dec. 1.

But then there’s western New York. The Buffalo area got slammed with more than 7 feet of snow in November and saw another foot on Tuesday. Thursday night and Friday could bring another 5 inches to 10 inches, weather forecasters say.

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MEANWHILE IN ARIZONA …

Phoenix posted a record high temperature of 80 degrees on Wednesday. That broke the old record of 79 set in 1948.

Over in Tempe, 74-year-old Bill Justice was wearing shorts while hanging out in his yard, just days after the National Weather Service announced that 2014 was the warmest year ever recorded in Arizona.

“We can enjoy all kinds of things in the winter and the same thing in the summer,” Justice said, adding that if he lived in Colorado or another cold climate, his swimming pool would be frozen by now.