Doesnt take very long, as little as ten minutes. Lester. Ron mott, thanks very much. Al roker is here. Al, walk us through this. So lester, the beginning of this cold air is way up in greenland. Were talking temperatures of 60 below across the Greenland Ice sheath. Youve got low pressure over quebec and this strong low pressure system with the clockwise, counterclockwise flow around it it brings that cold air, brutally cold air into the continental united states, so low temperatures tomorrow morning, burlington minus 12, 5 in cleveland and 10 chicago and 17 in charlotte and 21 in atlanta. Highs tomorrow, 19 in new york, 13 cleveland and 14 chicago but as ron mentioned those windchills are brutal. Minus 6 in new york and minus 4 in cincinnati and minus 13 in chicago, and then we bottom out on sunday morning, but the good news, lester, by tuesday temperatures rebound into the 50s and 30s. Everybody either at or above normal. All right. True to predictions its getting nasty on the campaign trail in South Carolina as another socalled birther attack today threatening to sue ted cruz for, quote, not citizen. If cruz doesnt as trump clean up his act and that battle is fronts opening up as the gop candidates sharpen their attacks on each other. Nbcs Gabe Gutierrez greenville, South Carolina. Reporter fresh off autographing a baby in louisiana, republican frontrunner donald trump is now leaving a new signature on this race, threatening to sue his closest rival ted cruz for not being a natural born citizen. On twitter the billionaire calling the texas senator a liar for running negative ads against him. Theres more than a little irony in donald accusing anyone of being nasty given the amazing torrent of insults and obscenities and vulgarities that come out of his mouth. Reporter these voters have serious concerns about trump at a rally this week and described him this way. Leader. Flashy. Alpha dog. Rich. Dogmatic. Narcissistic. Inspirational. Reporter cruz himself is mocking his opponent in a series of new ads, this one against marco rubio backfired. Makes me feel dumb for trusting them. Maybe you should vote for more than just a pretty face next time. Reporter Cruz Campaign yanking it after the revelation that actress had appeared in adult films. We would not have cast her had we known reporter rubio today firing back in an exclusive the bottom line is they were actor, and i think thats part of a bigger problem that ted has, and that is he tries to act like the only consistent race. Its just not true. Hes a recalculated political operative. Reporter all this as several gop hopefuls try to court crucial evangelical voters. Faith is the most important influence in my night. One night reading reporter tonight amid a flouriflurry of attacks serenity in this race is hard to find. The republican candidates are set to face off in another debate tomorrow. The stakes may be highest for marco rubio. Hes expected to take some of the heaviest fire, especially from his mentor and fellow Floridian Jeb bush. Lester. All right, gabe, thank you. Attacks are flying dontic side of the race with Bernie Sanders accusing Hillary Clinton of hitting him with a, quote, low blow on the debate stage last night, and a heated battle over the Different Directions they take on health care in this country. Lets get more from nbcs andrea mitchell. Reporter trying to reboot her campaign, Hillary Clinton accused Bernie Sanders of being disloyal to president obama who is hugely popular with minorities in the primaries and caucuses to come. The kind of criticism that weve heard from senator sanders about our president i expect from republicans. Madam secretary, that is a lo below. Reporter and she proposed medicare for all, birthtodeath Government Health care sglan with health care, this is not about math, this is about peoples lives. The numbers dont add up, and i think once im in the white house we will have enough Political Capital to be able to do that. Secretary clinton, youre not in the white house yet and let us be clear that every proposal that i have introduced has been paid for. Reporter sanders would combine all Government Health plans into one, medicare, medicaid, veterans benefits, Childrens Health insurance and replace employerbased health care and private insurance. How to pay for it . Sanders would tax the rich. He says the middle class would pay 500 a year more in taxes, but average family would save 5,000 a year by eliminating insurance premiums. Who is correct here . There are a lot of tax increases but its certainly not clear that they would be the additional expenses. Reporter nonbudget partisan experts say sanders hasnt given enough details and in canada and Great Britain which have Health Care People wait months for procedures, a form of rationing. There will be tradeoffs, and if we want to save money youll have to understand that your access to Health Care May be limited. Reporter and then the political costs, Getting Congress to pass his Health Care Plan with the most bruising fight of the Obama Presidency but Bernie Sanders is calling for a political revolution, a grass roots army he believes would compel congress to accept his lester . All right, andrea, thank you. Investigating a vicious attack that restaurant in ohio. It happened when a man pulled out a machete and went on a ramp average, slashing and stabbing people as customers made help. The questions investigators are trying to answer why did he do it and could terrorism . We get the late forest our justice correspondent pete williams. This columbus restaurant around dinnertime, asked some questions and came we are a machete. Some guy pulled out a machete and started out with my kids. There are several people injured here. Reporter some of those inside threw chairs to fight back. He ran out, drove away and was stopped after a fivemile chase. Police say he was shot and killed when he lunged holding a knife at one of them. The fbi immediately began searching the home of the man identified as the attacker, 30yearold mohammed barrie. Radical comments four years ago brought a brief look from the fbi and then moved on. Restaurant employees say when he first came in he asked where the owner is from. The owner is from israel, a christian arab. Investigators are looking at whether barrie may have mistakenly thought he was jewish. Im a 50yearold man and been crying like a baby for the last 12 hours. Reporter four people were hurt, the foley who sings at the restaurant now in critical but stable condition. Were very grateful that our victims that sustained wounds last night are all expected to recover. Reporter investigators say they dont know why barrie attacked now and shows that target, no known connections with isis. It may be one Law Enforcement official says a blend of factors, a long simmering interest in radicalism and all the attention given to terror attacks worldwide. Pete williams, nbc news, washington. The city of glendale, arizona is in shock and mourning after the shooting deaths of two 15yearold girls on a high school campus. The girls, both sophomores, died of single gunshot wounds at independence high school. A gun found beside their bodies. Police say they are not pursuing any suspects, but they could not yet confirm if it was murder or suicide. Within a week a temporary crease fire in syria brokered with the help of the u. S. Is schedule to take effect, but key parties have been left announced last night. Our keir simmons now with a rare look inside syria where theres much skepticism over whether the deal will end the bloodshed. Reporter a little boy is pulled from rubble after an air strike. The video said to be in aleppo province was posted on facebook last week. Tonight there is little signs those air strikes will end, even with World Leaders including america and russia agreeing to a cessation of hostilities within one week and humidian aid to communities end siege suffering starvation. And what we have here are words on paper. What we need to see in the next few days are actions on the ground, in the field reporter Major Players in the fight, including syrian president Bashar Al Assad and the rebels fighting him are not part of the deal. Neither is isis. And today assad is vowing to retake the president assad is very visibly in control of the capital damascus while outside the city his forces offensive. The syrian army advancing, backed by russian air strikes. They have gained momentum, the upper hand. Why would they stop now . While in damascus few people the fighting will stop. Do you believe there will be peace now. I dont think so. I think nobody nobody knows when the peace is gone. 6yearold ayas lex were broken while in an air raid while she was out buying cookies. Shes one of tens of thousands who have fled. Those still here losing hope. Keir simmons, nbc news, damascus. A major announcement from three federal agencies about a possible danger that nbc news first reported on nearly a year and a half. The government will investigate the potential health risks from a type of turf that Children Play on nbcs Stephanie Gosk has more. Reporter these soccer players, all goalies, all diagnosed with cancer, sparked a battle over the use of foam rubber, ground up car and truck tires in tens of thousands of turf field around the country. Today three federal agencies, including the epa, announced a new Research Plan to analyze the safety of crumb rubber. The existing studies do not comprehensively evaluate the concerns. Nbc news first reported on crumb rubber in october 2014. This is the stuff everybody is talking about. Reporter woman soccer coach amy griffin started asking questions after two of her goalies developed cancer, a conversation with Austin Everett who would later die of nonhodgkins lymphoma haunted her. She said i just have a feeling it has something to do with those block dots. Reporter coach started a list of goalies with cancer which grew from just a handful to now 75 following nbcs reports. There is no Research Exposure to cancer, and the industry points to dozens of studies as proof that their fields are safe, but the federal government today says more reacher is needed. The three agencies will analyze chemical compounds in the crumb rubber, measure exposure to those chemicals and reach out to concerned parents, scientists and Industry Leaders. Parents like this who now the the use of crumb rubber hope that communities will hold off in installing new needs. Why not pause, use alternatives until this thing gets figured out because our children are certainly worth it. Reporter today Industry Leaders say they welcome the new research. In their words they hope the federal government can settle this matter once and for all. Lester . All right. Stephanie, thank you. Still ahead tonight, thieves after your medical records. Why you could be at risk without even knowing it, and one experts say you should never share with your Doctors Office in order to protect your and the cost of of reach for those in this kindergarten hand now a warning about your most personal information as risk. Medical records being hacked, stolen and sold for fraud. Up 11,000 last year, roughly one out of every three americans has been hit, whether they know it or not, giving criminals a wealth of information that unlike compromised credit card numbers can last forever. Nbcs tom costello has what you can do to protect yourself. For john coon it was a simple xray after a snowboarding accident that turned into an accounting nightmare when the Hospital Surgery he never had. I had to go down in front of the Billing Department no less and pull up my shirt and show them that i did not have any major scarring on my stomach at all. Reporter it turns out the hospitals hard drive had been stolen along with johns medical records. Just one of the 100 Million Health care records stolen last year alone. Many of those records show up for sale on the dark web where hackers openly advertise themselves and what they have stolen. This site offers fresh health care profiles stolen last april in california boasting you can use those profiles for normal fraud stuff or to get a brand new Health Care Plan for yourself. This looks very user friendly, and this is designed for crooks. This is where information from big data breeches ends up as xhomd tis are being stole. Reporter stolen credit cards going g for 1 to 3 each and Social Security numbers 15, but complete Health Care Records are a gold mines going for 60 bucks because criminals can use them to order treatments and surgery and even file false tax returns. You basically own a person, have all the information and can you create a new account and fake his whole identity. Reporter to avoid getting hacked ibm Security Pros advise using following good work practices, dont use the same passwords and avoid giving out your Social Security numbers, even the last four digits to hospitals and Doctors Offices. You really need to push back on those situations and say, look, can i give you a p. I. N. Or some piece of information that can i change on a regular basis. Reporter if your Health Records are compromised, your Financial Life can be, too. Tom costello, nbc news, new york. When we come back, surfs up, way up. 50foot waves supercharged by el nino are making one of history in cuba today as pope francis arrived on the island ahead of a trip to mexico. There he met with the head of the Russian Orthodox church, kissing each other on the cheeks and embracing at the havana airport, a thats divided christianity for a thousand years. Its one of the most dangerous surfing events in the world and this years titans of mavericks competition in Northern California is living up to its reputation with 50foot waves supercharged by el nino, barreling in at 40 Miles Per Hour just 15 seconds apart. 24 of the worlds elite surfers are competing for a 120,000 prize and bragging rights. When we come back, why this whole kindergarten class is finally tonight, a golden opportunity for an entire class of 26 kindergarteners all from lowincome families and saving for a College Education is a struggle, but as our Miguel Almaguer reports those worries about the future are now over thanks to a 1 million gift from a man making a difference. Reporter today is College Friday inside mrs. Ashtons kindergarten class. Thats where christian is going to go to college. Reporter most of her 26 students come from lowincome singleparent homes where the price of college, is out of reach, but not anymore. Youre going to be a teacher . Reporter Marty Burbank wants to pay for every student here to go to college. Im going to put off retirement a few years. Reporter a lawyer who met his wife on a boat and got married on a yacht was ready to bay his dream cruiser. Times 12. Reporter when he realized there was a better way to spend his money. Our pastor gave a severalon about charity and giving and sacrifice and and at that point i really felt like i could invest in this boat or i could invest in 26 kids and hopefully make a difference in their lives. The gift and the offer is lifechanging. Their future literally is different because of this. Reporter isabella celadon couldnt believe the generosity. Oh, my gosh. Reporter the seamstress says her son jason can now be anything he wants. Doctor. Reporter every year these kids will need to draw a picture or write a letter burbank who is investing over 1 million in their future. Im grateful for the opportunity to do this because it brings me so much joy helping kids. Reporter one couple giving up so much but getting back in return a gift thats priceless. Miguel almaguer, nbc news, anaheim, california. And thats going to do it on this friday night. Im lester holt. For all of us at nbc news, thank you for watching. Have a great weekend announcer today on the meredith voir vier show and did you you see the surprise appearance on the lipsync with channing ta tum and. Hodan is here and how she keeps the romance alive in her it starts right now on meredith. Meredith hello, we have a great show today. An amazing here, baby, i am excited because my pal hoda kotb is here. She has been here all morning and speaking of drinking, you you are feeling the winter blues, and we have winter booze. That will snap you you out of. That first whats hot now. Megan we are drinking. Meredith never said i was not drinking. A pact. Meredith you have been drinking. Lance day two now. Meredith you are singling me out, now. Megan no. Yamaneika i am just glad hodan is here. Meredith she is everything that you see on television. Shes one of the kindest and funniest and smartest ladies around. Megan and joyful. Friends. I dont know her. Well all be best friend upon. Meredith well try. I am excited about the super bowl. Halftime show has gotten better because beyonce will be joining. Me. But you called this, lance. Lance plose start listening i predict everything. Cold play and beyonce. It will be a medley of the performances. I think Justin Timber lake will come out. I think paul mccart no and u2. You will see a med lo. It is the 50th super bowl. Megan you heard it first. Meredith only thing that would make it great is if nsync showed up. Lance nsync. I am available super bowl. I am available. Meredith maybe it is not a surprise to you. But there are rumors about her. But she made a surprise appearance of channing ta tum. He is compoting against his wife jenna