Plus, dozens killed in a massive riot at a mexican prison. Rethinking the olympics. Is it really worth risking the zika infection . And plenty to keep you entertained during this frozen valentines day weekend. Somebody call the room because things are about to get hot. Early today starts right now. Good morning, everyone. A polar vortex is making its way to the east coast bringing bonechilling weather down to florida. Experiencing winters bite with whiteout conditions. In scranton, a water main break made for a real mess as ice coated nearby homes, sidewalks, power lines and trees. Joining us with more on the brutal cold, sounds like we need to hibernate . Thats right. Outside doors it wonting nice. Enjoy the indoors. Out here across the west, its pleasant. Temperatures in the 80s to the 90s. Its almost like memorial day weekend, not president s day weekend. 32 below zero, current windchill in international falling. The contrast between the west and the east. If you are in the west and traveling east this weekend, i advise you to pack heavily your winter wardrobe. Look at these temperatures in the big cities. 2 degrees. Were going to challenge a 100year record in new york city by sunday morning, and it looks like temperatures all across the northeast will be well below zero. Dangerous cold. People need to take it really seriously. And stay indoors as well. Stephen, thank you so much. Up next, politics. The two president ial candidates faced off in milwaukee, from attacking president obama to sparring over immigration, civil rights, even Henry Kissinger. She talked about getting the approval, support or mentoring of Henry Kissinger. Now, i find it rather amazing. Because i happen to believe that Henry Kissinger was one of the most destructive secretaries of state in the modern history of this country. I am proud to say that hengry kissinger is not my friend. I will not take advice from Henry Kissinger. I know journalists have asked who you do listen to on Foreign Policy and we have yet to know who it is. Well, it aint Henry Kissinger. Thats for sure. One of the biggest back and forth came when clinton jabbed sanders for not supporting president obama. Today senator sanders said president obama failed the president ial leadership test and this is not the first time that he has criticized president obama. In the past hes called him weak. Hes called him a disappointment. And i couldnt disagree more. The kind of criticism that weve heard from senator sanders about our president i expect from republicans. I do not expect from someone running for the democratic nomination to succeed president obama. That is madam secretary that is a low blow. I have work would president with president obama for the last seven years, but you know what . Last i heard we lived in a democratic society. Last i heard, a United States senator had the right to disagree with a president , including a president whos done such an extraordinary job. So i have voiced criticisms. Youre right. Maybe you havent. I have. Later, sanders hit back on critics saying only Clintons Campaign is historic and that he was thwarting history. Well, you know from a historical point of view, somebody with my background, somebody with my views, somebody who has spent his entire life taking on the big money interests, i think a sanders victory would be of some historical accomplishment as well. The share of the twitter discussion was a dead tie. Although sanders keeping with recent tradition got more followers, and while sanders dominated on facebook, clinton was able to narrow the gap from the start of the debate to the end. To the republican race now and donald trump who is hitting hard all groups, he took time to sport a mohawk baby, rocking a pacifier prp it wasnt all fun and games. Much of the day trump was in a heated back and forth with nemesis ted cruz after cruz implied trump and marco rubio are with the president on gay marriage. Nbcs Hallie Jackson has more. Im a volunteer with the reporter making some 25,000 phone calls a day to topple donald trump here, like he did in iowa. In the state of South Carolina, i dont think people are interested in someone, a republican candidate, whos pushed partialbirth abortion. Who wont support marriage. Reporter more liberal, more ads like this. He pretends to be a republican. Reporter for his part, trump is playing a more positive Political Campaign than. Before i see whats happening. Its going to be such an unbelievable week and a half. Reporter but in the more mannerly south, his more colorful language may be a big turnoff. He gets the nomen ace, nomination, theyre going to sue his its crass. Its not professional. Its not how you want your president of the United States. You turn on the tv. A leading president ial candidate saying profanity from a stage. Reporter marco rubio and jeb bush, taking shots at the frontrunners. How do you think donald trump going to washington is going to solve anything . Reporter and at each other. Jeb bush has no Foreign Policy experience, period. Reporter trying to prove South Carolina isnt just a twoman fight. A dramatic end to a 41day siege in an oregon wildlife refuge. He three maining antiactivists surrendered thursday after hours of intense negotiations. The fourth and final occupier, david frye, refused to come out but finally turned himself in. All four are expected to be arraigned before a magistrate in portland today. The fbi says the ref phuge will remain closed while they check nor explosives. And the father and son taking into custody arrested, faces several charges stemming an incident with Law Enforcement years ago in nevada. And two remain in a hospital an frightening attack inside an ohio restaurant. That call about a man in a head scarf came in shortly after 6 00 p. M. Local time. This, on thursday. The man entered the nazareth restaurant and reportedly began attacking people with a machete. Its a mediterranean restaurant. Diners threw chairs and other objects to stop the attack. He ran and was pursued by a helicopter. Minutes later, the suspect was stopped and police unsuccessfully tried to taser him and he then lunged at officers with a machete and a knife and he was fatally shot. The fbi is assisting in the investigation here. Officials say as of now they are not calling it terrorism. At least 49 inmates are dead following a prison battle between rival drug gangs in northern mexico. Mexican Officials Say the fight started around midnight thursday at the prison between the infamous zedas gang and another group. Authorities say there was no gun fire. Officials say the situation is now under control and ruled out the possibility of a prison break. Family members gathered, some crying, awaiting news of loved ones. The riot comes less than a week before pope francis is scheduled to visit another prison farther north. And predicted by Albert Einstein in 1815. Over 100 years later we finally heard this thats what weve been looking for. Just a quick chirp, and she is excited. The waves come from a collision between two black holes, both, get this, they are 30 times as big as the sun. Over a billion light years away. The waves are ripples in space time. Think about a rock dropping into a pond. The discovery proves the last piece of einsteins general theory of relativity. I would say that is so, so cool. Isnt it . I remember learning about that in physics class as well. Get brushed up on your science lessons here. Get back to the book. When you see how scientists are so excited. Lets talk about the weather, steve . Crazy. Were talking about a huge difference between the west and the east coast here for the candidate weekend. You know, on the west coast, enjoying life. Temperatures could not be any better here. If you wanted to be outside this weekend, upper 80s. L. A. , around 90 in phoenix. 90 in phoenix, the earliest time we ever have done so in a year. Wow. A look at like were talking about two different countries. Absolutely. Enjoy the west, because its the best. Thank you. We have new information this morning on the arrerest of thos Hillary Clinton emails. Plus, this is one way to stop a drug dealer and looking, oh, so cool, in the process early today is coming right back. I take pictures of sunrises. Its my job and its also my passion. But with my back pain i couldnt sleep. So i couldnt get up in time. Then i found aleve pm. Aleve pm is the only one to combine a sleep aid plus the 12 hour pain relieving strength of aleve. And now. Im back. Aleve pm for a better am. Vis sunday . Y so get to kohls super saturday. And save on early birds till 1pm. Like 70 off fine jewelry. Save on dress shirts for him. 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We have agreed to implement a nationwide cessation of hospitals to begin in one weeks time. The diplomats also agreed to the immediate delivery of humanitarian aid to the syrian people. The ceasefire does not apply to military action like u. S. And russian air strikes against groups like isis. A federal judge ordered Hillary Clintons last emails be released before super tuesday. In fourth installments the last of the 55,000 pages of emails will be published right before the nevada caucus, South Carolina primary and super tuesday. And this man in kingston, england, hail add hero for tripping an accused drug dealer chased by police as the suspect runs closer, he gist, yep. Stuck out his leg causing him to fall allowing police to pounce right on top of him. Just ahead, the zika virus has star athletes on edge. The details, next. You get. And i expect the same from my mascara. Now, revlon introduces a new collection of mascaras that makes getting the lash look you want easy. 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Live flake free for life this morning on today, just in time for valentines day, jeff rossen investigates whether science can predict everlasting love. The cdc reported that puerto rico could be the next hot spot for the zika virus with possibly tense of thousands of cases. The u. S. Olympics is paying attention with the olympics just around the corner and theyre speaking out. Reporter the u. S. Olympic committee announced its hiring two Infectious Disease experts to advice the 500 athletes hoping to compete in brazil. Including soccer star hope solo. If i had to decide today i would not go. Fortunately, the olympics are about six months away. So i believe we have time to get some of our doubts and questions answered. Reporter the soccer teams will compete in areas even more vulnerable to zika than the olympic headquarters in rio. One stadium is near the amazon rain forest another in an area where a number of zika cases are especially high. I dont think soccer should be so close to the rain forest where theres more mosquitoes. I take my health very seriously. We all do. Reporter new Research Found more evidence linking zika to babies born with microcephaly. And while olympics competed while pregnant, five in 2012, including Gold Medalist kerri walsh jennings. We will be waiting to hear what kind of steps will be taken to make sure everything is safer and secure. Reporter with women making up half the american team, the countdown to the olympics is on. Rehema ellis, nbc news, new york. Just ahead, a big valentines weekend ahead at the movies. Well tell youcombinings amazin guys with zero gravity. The results, just fabulous. If youre looking to save money on your Medicare Part d prescriptions, walgreens says, carpe med diem. Seize the day to get more out of life and Medicare Part d. Just switch to walgreens for savings thatll be the highlight of your day. Now preview the cost of your copay before you fill. 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Later today, president obama will appear on ellen. His second time on the show. A little selfie action. The president helped ellen make a special valentine for michelle. I set up a setting. Ive got something prepared. Somebody call the situation room, because things are about to get hot. Michelle, this valentines day im going to treat you right. Im going to make you some zucchini bread. Then ill spread out some veggies on a plate, just the way you like them. Because i love you so much, i obama care about you more than you even know. Michelle, ive made a lot of great decisions as president. The best decision i ever made was choosing you. Thanks for putting up with me. I love you. Ah how classic is that . He is quite the gentleman and hilarious. Did you see the comedian thing with Jerry Seinfeld . You have to watch this weekend. Super funny. As funny as that, though . As funny as that . Classic. Im sheba russell, and this is early today. Whats that, broheim . 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They will connect death valley, Joshua Tree Park and mojave preserve creating the second largest desert preserve in the world. President obama has set aside more of americas lands and waters for conservation preservation than any of his predecessors. And a 50yearold man from ontario disappeared 30 years ago and presumed dead. Turns out he suffer add head injury of 21 and only now began having flashbacks. And finally stopped, a leak which began spewing from a broken well in october forced thousands to flee their homes. The Southern California gas company says the well may be permanently sealed in the coming days.