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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.
School delays and cancellations, a fatal car pileup and worries about the homeless.
Here's a look at what's happening:
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.
DELAYING AND CANCELING SCHOOL
School districts from the South to the Northeast are delaying the start of classes or canceling school altogether.
Wind-chill readings below zero were forecast in such places as Alabama and Asheville, North Carolina, along with a chunk of the Midwest and the Plains. Some areas also are seeing anywhere from a few inches to a foot of snow.
In northwest Georgia, schools in Catoosa County will have 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. School officials have urged students to wait for buses inside or in warm cars with parents, and have said bus drivers would make individual stops at students' homes and blow their horns if necessary.
Among the many cities modifying school schedules is Detroit, where it was 8 degrees on Wednesday. At least Detroit-area 15 area districts and schools canceled classes Thursday.
STAYING WARM, REACHING OUT TO THE HOMELESS
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.
THERE IS A BRIGHT SIDE
Temperatures were expected to drop 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 1½ to 2½ 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.
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.
Associated Press writers Steve Karnowski and Jeff Baenen in Minneapolis; Raquel Maria Dillon in Los Angeles; and Mike Hill in Albany, New York, contributed to this report.