Florida and Georgia residents are preparing for severe cold weather during the next three days. Follow live updates below for road closures and snow sightings:
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8:45 p.m.
Mississippi’s largest city says record cold is breaking water mains, leaving some customers with little or no water flow.
Jackson city spokeswoman Kai Williams said Wednesday that the city knew of 37 separate water main breaks that it attributed to cold. The city has declared an emergency and is hiring outside contractors to help repair water main breaks.
The city says the water main breaks and people leaving water running to prevent frozen pipes are draining water towers and sapping pressure on the system. The city says low pressure could continue into the weekend in some areas.
Cold snaps in 2010 and 2011 caused widespread water main breaks, leaving broad swaths of the city without water.
The cold is also causing trouble elsewhere. At Jackson State University, returning students are being kept out of two dormitories because of burst pipes.
6:20 p.m.
Two of the South's iconic coastal cities are weathering their heaviest snowfall in nearly 30 years.
The National Weather Service on Wednesday recorded 5 inches (12.7 centimeters) of snow in Charleston, South Carolina, as a winter storm blasted the Southeast coast and dumped snow as far south as Florida.
Across the Georgia-South Carolina state line, the weather service reported 1.2 inches (3 centimeters) of snowfall in Savannah.
Those are the highest accumulations recorded in either city since December 23, 1989, when Charleston saw a record 6 inches (15 centimeters) of snow. Savannah had 3.2 inches (8.13 centimeters) on the same date — its second-highest snowfall on record.
4:10 p.m.
Airlines have already canceled 500 U.S. flights on Wednesday because of a winter storm socking the Southeast, and many more will be scuttled Thursday as the brunt of the winter weather is expected to hit the Northeast.
Tracking service FlightAware.com says more than 1,700 flights have been canceled Thursday. More than half the flights scheduled for Thursday at Boston Logan International Airport had been scrubbed, and so had nearly half the flights at New York's LaGuardia Airport. Two other New York-area airports, JFK and Newark, were also hit hard along with smaller airports in the Northeast.
JetBlue has a major operation in Boston. It canceled about 400 flights through Thursday along the East Coast.
Most airlines were letting customers change reservations without incurring a fee, usually up to $200 on U.S. flights.
2:15 p.m.
The National Weather Service says a winter storm developing the U.S. Southeast coast will probably intensify so rapidly that it will qualify as a "bomb cyclone."
The "bomb cyclone" should dump 8 inches (20 centimeters) to a foot (0.3 meter) of snow on the Boston area Thursday and at least half a foot of snow in the New York City region.
Still, meteorologists say most of the storm's fierce hurricane-force winds should stay out to sea until it nears Cape Cod, Maine and Canada. Weather Prediction Center lead forecaster Bob Oravec says the fast-moving system can bring 70 mph (113 kph) wind gusts to coastal New England.
Meteorologists say perhaps the worst effects could be bitter subzero cold — chillier than the frigid past couple weeks.
The weather service has issued blizzard warnings for the coast from parts of Rhode Island to Maine, but Oravec expects the blizzard warnings could be extended as far south as parts of New York.
Noon
Authorities say a 96-year-old woman has died after apparently wandering away from her suburban Detroit home and being overcome by the cold.
The Roseville Police Department says the woman's body was found Tuesday on the playground of Dort Elementary School, near her home. She was dressed in a nightgown, robe and slippers.
Police say she lived alone and had recently been diagnosed with dementia.
Police say the death has been ruled accidental by the Macomb County Medical Examiner's Office due to exposure.
The death is among more than a dozen as brutal winter weather grips parts of the U.S.
11:30 a.m.
The snow and ice moving into South Carolina has prompted officials to close Charleston International Airport.
The airport said in a twitter message that Joint Base Charleston has closed the runways because of ice. The airport shares runways with the U.S. Air Force at the North Charleston facility.
The airport said flight operations would not resume until the Air Force determines the runways are safe for aircraft and passengers.
Snow and ice is expected over the eastern half of South Carolina on Wednesday as a storm moves up the East Coast.
11 a.m.
It snowed briefly in Tallahassee, Florida, the first time in 28 years.
The snow brought a childlike joy and wonder and loud vocal whoops from longtime residents who rarely see the white stuff.
Sharon Rosenberg is a 35-year-old physical therapist who has lived in the state capital her entire life. Rosenberg and her two young children and husband bundled up and went outside early in the morning hoping to catch a glimpse of the snow falling.
She says she didn't think it was going to happen, and then "literally two seconds later it started snowing."
She and her children caught snowflakes on their tongues and made small snowballs.
10:45 a.m.
Authorities in Indiana say a man who stowed away on an Ohio River barge was rescued after nearly freezing to death in frigid weather.
New Albany Fire Chief Matt Juliot tells The News and Tribune that the coal barge's crew called 911 early Tuesday after finding the man hiding inside the vessel's hold.
The department says the man, who's reportedly homeless, was rescued on the department's fire boat with the assistance of the Louisville Fire Department and the U.S. Coast Guard and treated for "extreme cold exposure."
The temperature was 0 degrees (-17 Celsius) with subzero wind chills at the time of the rescue.
Juliot says cold-weather rescues are rare for New Albany's fire department because it normally doesn't get so cold in the city in southern Indiana.
10:10 a.m.
As a winter storm pushes cold temperatures deep into Florida, farmers across the state are on alert.
Citrus trees survive until temperatures fall to 28 degrees or less for at least three hours. So far, forecasts don't show that happening in the Florida citrus-growing belt from Interstate 4 near Orlando and to the south.
Both citrus and strawberry growers protect their crops by running irrigation systems once the temperature dips toward 32 degrees. The freezing water creates ice, which releases heat that protects the fruit.
Strawberry growers typically run irrigation systems to "ice" the fruit at least once per season. There are about 8,000 acres of strawberry farms in the state, which is the second largest strawberry producing region in the U.S., according to the Florida Strawberry Growers Association. Most of the berries are grown just east of downtown Tampa.
9:20 a.m.
The National Weather Service says snowfall is ending in Tallahassee and is heading east, across Interstate 10 and toward Jacksonville on Florida's Atlantic coast.
In a tweet, the National Weather Service in Tallahassee said points to the east are getting "steady freezing rain, sleet and snow." Officials also warn that dangerous driving conditions persist across the area.
Officials said about 0.1 inch (0.25 centimeter) of snow was reported on the roof of weather service office in Tallahassee.
Schools have closed in several northern Florida districts, while students across much of the area remain out on winter break.
In Jacksonville, the mayor told non-essential city employees to stay home on Wednesday.
8:30 a.m.
Snow flurries are falling as far south as Tallahassee, Florida, where officials were forced to close a section of Interstate 10 due to icy conditions.
The National Weather Service predicted snow flurries across a swath of northern Florida, from Tallahassee to Jacksonville, on Wednesday morning. Accumulations were not expected.
On its Twitter account, The Tallahassee Police Department warned motorists that ice could form on bridges early Wednesday.
The weather service in Tallahassee tweeted that there's one-tenth of an inch (0.25 centimeter) of snow on the roof of the building.
Schools in at least five districts canceled classes on Wednesday as well. In Tallahassee, students were supposed to return from winter break, but got another day thanks to the weather. Also in the Orlando area, theme parks closed water attractions due to cold weather.
6:45 a.m.
Law enforcement agencies are reporting freezing rain and ice on bridges in south Georgia as a winter storm revs up along the East Coast.
Police in the south Georgia city of Brunswick reported on their official Twitter account Wednesday morning that some area bridges had begun to ice up. Brunswick police added that there have already been crashes and they are advising motorists to stay off the roads.
The winter storm is threatening to dump snow and ice on parts of the U.S. South that rarely see frozen flurries, much less accumulation.
The National Weather Service said a wintry mix of snow and freezing rain was expected Wednesday mostly along the Southeast's Atlantic coast. Up to an inch (2.5 centimeters) of snow could fall in Tallahassee, Florida, while 3 to 5 inches (8 to 13 centimeters) are possible in parts of North Carolina.
6:30 a.m.
Weather warnings forced some school districts in Florida's northern counties to close just as students were set to return after a winter break. A massive front is bringing some of the coldest temperatures in years to parts of Florida.
In central Florida, the state's largest theme parks announced that water attractions such as Disney's Typhoon Lagoon, Universal Orlando's Volcano Bay and SeaWorld's Aquatica were closed Wednesday because of the cold snap.
The temperature early Wednesday in Orlando was 50 degrees Fahrenheit (10 Celsius) and it was raining.
The mayor of Jacksonville in north Florida closed city offices to all but essential personnel on Wednesday, advising people to stay off the roads. In Tallahassee, school officials announced that classes would remain closed Wednesday.
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5:45 a.m.
The North Carolina Zoo is offering half-priced admission while a bitter cold wave sweeps the South, giving visitors a chance to see polar bears frolic in their kind of weather.
Zoo visitors, however, shouldn't expect to see any lions, elephants or gorillas native to Africa on view. With the mercury dipping below freezing, animals more suited to warmer climes will remain in their behind-the-scenes quarters.
Local news outlets report the zoo in Asheboro is offering the special discount rates through Saturday.
Besides polar bears, Arctic foxes, elk and other cold-tolerant animals will be on display. And for humans wary of venturing outdoors in dangerously low temperatures, the zoo is promising heated habitat complexes and transportation to stay warm.
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3 a.m.
Brutal winter weather that's brought subzero temperatures to parts of the U.S. is threatening to dump snow and ice across areas of the South that rarely see flurries, much less accumulation.
The National Weather Service said a wintry mix of snow and freezing rain was expected Wednesday mainly along the Atlantic seaboard from Florida to North Carolina. It warned that icy roads and low visibility could make driving treacherous across the region.
In Savannah, a coastal city that hasn't seen measurable snowfall since February 2010, up to 2 inches (5 centimeters) of snow and sleet were forecast. As city officials filled dump trucks with sand to spread on major streets, Mayor Eddie DeLoach urged residents to stay home and keep off the roads.