Good evening. Tonight in rainsaturated california, the states entire National Guard has been placed on standby as nearly 200,000 people wait anxiously after fleeing their homes in panic from the path of a broken dam spillway. The Evacuation Order below the oroville dam in Northern California was issued late yesterday amid fears a breach could send a 30foottall wall of water cascading onto hapless communities. This at this hour a break in the weather is giving emergency crews a critical window as they race to repair the damage before the next rainfall. Abcs Miguel Almaguer is there and has the latest. Reporter tonight at the nations tallest dam, all eyes are on this emergency spillway. Helicopters ready to drop bags of boulders racing to shore up an eroding gash. The Cascade Holding for now. But still in danger of a major failure. This is still a dynamic situation. Its still a situation were trying to assess. Reporter the order to evacuate everyone downstream came late sunday. Emphasizing this is not a drill. You go straight through, make a right wherever you can reporter 188,000 people warned of catastrophic danger. All racing to reach higher ground. It was pretty hectic. The whole apartment complex started packing up and rushing out. Reporter in 2005, environmental advocates warned of an infrastructure failure like this, but no action was taken. After weeks of relentless rain, oroville surpassed capacity. If drained, water could cover an area the size of connecticut one foot deep. Thesy 70foot dam is structurally sound. The main spillway, damage last week is releasing water quickly. But its the emergency spillway made of earth that Officials Say could release a 30foot wall of water, a virtual tsunami that could cascade into communities below. Im worried of course about people first and animals and then my home. Reporter overnight the work continued to shore up the lake before the next rain. Oroville has had a dramatic turnaround. We were here two years ago when the reservoir was depleted. Water levels are at historic lows and the theyre dropping everday. But now a deluge bursting at the seams. A region on the edge of disaster. About a mile away from that jeopardized spillway on a shoreline that is safe for us to stand on, we want to show you the rapids here. They are Strong Enough to carry a home, even a neighborhood, down the river. And with most of rain in the forecast, this waterway will get even more dangerous. Lester . Miguel almaguer, thank you. Theres new fallout tonight about Embattled National security adviser Michael Flynn after he was caught apparently giving false information to Vice President mike pence, which pence then repeated on national television. The white house tonight offering differing signals over flynns future. Lets get the latest from nbcs andrea mitchell. Reporter National Security adviser mike flynn on the job, but after twisting for three days in the wind. Tonight mixed messages from the white house. A Strong Defense from one top aide does he have the full confidence of the president . Yes, he does. Reporter an hour later a different signal from the press secretary saying the president is evaluating the situation. Hes speaking to the Vice President , to Vice President pence, relative to the conversation the Vice President had with general flynn. And also speaking to various other people. Reporter late today no endorsement from the president. And the Vice President also not answering questions. Do you still have confidence in him . Did he lie to you . Reporter a senior official tells nbc news flynn has apologized to mike pence after pence vouched for him, denying flynn had even discussed sanctions with the Russian Ambassador in a phone call before President Trump took office. I talked to general flynn about that, that conversation. They did not discuss anything having to do with the United States decision to expel diplomats or impose a censure against russia. Reporter flynn later changing his story saying hes not 100 sure the topic didnt come up. Behind the scenes white house sources telling nbc news several aides are push the president to fire flynn although that move is not imminent. Still flynns communications with the russians already part of a larger congressional intelligence investigation. Democrats are demanding he be fired. How can you rely on a National Security adviser to make policy if that adviser is going to be untruthful with people . Reporter the uproar coming in the midst of reports of turmoil within the National Security ranks. Career officials seeking other assignments. Its a real toxic environment, nobody knowing whos in charge because of a fight between mike flynn and steve bannon. Tonight mike flynns future as National Security adviser is up to one man, the president of the United States. One friend who spent time with mr. Trump in florida this weekend telling me, dont look for a sudden shakeup, the president is in a factgathering mode right now. Tonight sean spicer telling reporters that mike flynn has not submitted his resignation. Levelser . Andrea mitchell, thank you. Meantime, the president hosted canadian Prime MinisterJustin Trudeau at the white house today. A meeting obviously with important u. S. Ally, but it comes on a day that much of the focus still remained on nine. A flynn. Another storm over social media over what happened at the president s private club in the hours after that International Crisis involving a north Korean Missile. We get it all from nbc News White House correspondent kristen welker. Reporter President Trump aiming to fortify his relationship with key ally canadian Prime MinisterJustin Trudeau. The two leaders meeting for the first time today. It comes as the president faces a major Foreign Policy test with a foe. After north korea fired a Ballistic Missile over the weekend. Today the president responded in his strongest terms yet. North korea is a big, big problem. And we will deal with that very strongly. Reporter but over the weekend, questions surfaced after pictures appeared on social media showing the president dining with the Prime Minister of japan at his florida resort, maralago, a dinner that started just after 8 00, soon after news broke about the north Korean Missile launch. The dinner appeared to turn into an openair strategy session, onlookers told cnn, top aides holding their flashlights, illuminating documents. Democrats wasted no time pountsing. House Minority Leader Nancy Pelosi tweeting, theres no excuse for letting an International Crisis play out in front of a bunch of Country Club Members like dinner theater. The white house telling nbc news President Trump was fully briefed before dinner a secure facility and their discussions at the meal focused on the logistics of an impromptu News Conference they held later that night. The United States of america stands behind japan. Reporter still, some National Security experts say the episode raises concerns. This is what happens when the team is inexperienced. When they havent had to field too many National Security cries seals. They take shortcuts. They do things that in some ways could potentially compromise National Security. Despite the controversy over north korea, the administration tried to keep the focus on canada today. Ivanka trump posting this picture on social media sitting in the oval office with her father and the Prime Minister after a roundtable on women in business, touting their great discussion. Kristen welker at the white house, thanks. Another dangerous day on the roads in much of new england as a second round of winter misery slammed the region. It brought multiple feet of snow to some areas and deadly winds across a wider area. One man in pennsylvania killed when a tree branch was blown through his windshield. Nbcs blake mccoy with the latest. Reporter tonight up to 2 feet of fresh snow in parts of new england. On top of the foot many places got last week. This stuff is really heavy. Reporter in boston, schools were closed for the third day in a row. Crashes reported across the region, including three pedestrians struck and killed by snowplows. Behind the snow, fierce winds. 57 Million People under warnings and advisories today. Gusts of 72 Miles Per Hour reported in white plains, new york. 1,500 flights canceled. Many more delayed. Wind blowing the roof off this gas station and sending a tree crashing into a home in new york. Downed power lines interrupting Commuter Rail service in new jersey. Tonight wind is complicating plow efforts. Windy. You go, you push the snow, it blows it right back in. Reporter the state virtual shut down. Lonely out here today. Reporter blake mccoy, nbc news, portland, maine. A son of a man at the center of a penn state sex abuse scandal has been charged with sex abuse himself. Jeffrey sandusky, whose father is former penn state coach jerry sandusky, accused of asking minors to send him nude photos and perform a sexual act. He faces 14 counts including 12 felonies and is being held on 200,000 bail. His father, jerry sandusky, was convicted of 45 sex abuse counts in 2012 and is serving up to 60 years in prison. Now the latest in the growing heroin epidemic gripping the nation. 91 americans die every day from an opioid overdose according to the cdc. Now yet another city has seen a massive surge in overdoses. Many linked to a powerful and potentially deadly drug combination. Nbcs Gabe Gutierrez has more from louisville, kentucky. Reporter on the front lines of louisvilles heroin crisis is paramedic chris locketts. Weve definitely seen an increase in overdoses. Hes barely breathing. Reporter in just 32 hours last week, Jefferson County got 52 overdose calls, many caused by a dangerous mix of heroin and fentanyl. Police say one person who had been using heroin died while riding in a car that crashed. 10 that nelrelated deaths alone in the county jumped from 26 in 2015, to 139 in last year. Total overdose calls spiked to 695 in january, an average of 22 a day. I came on shift at 7 00 a. M. I saw my first heroin overdose nine minutes later. Reporter dr. Robert couch at norton autobahn hospitals e. R. Told us of a fentanyllaced batch of heroin the patients called the pallbearer. Users are looking for the strongest high they can get. Reporter adding to the cost, some version of an antidote skyrocketing, spiking 600 , 4,500 for a twopack. The company says it offers numerous discounts and rebates and has provided 200,000 free doses to Public Health departments serving patients in need. I put myself in terrible situations, doing early terrible things. Reporter Keith Ferrera is in recovery after experimenting with fentanyl. Addicts have a disease. That should be treated as well as and as efficiently as anyone else with a disease. Reporter the mayor is promising to hire 150 more Police Officers as the fight against heroin intensifies. Gabe gutierrez, nbc news, louisville, kentucky. There is big consumer news to report tonight involving what Many Americans say is one of their most confusing bills. Their cell phone bill. The average bill for a single line is now about 75 a month, often with strict data restrictions. But facing tough competition, the nations biggest service provider, verizon, made a move that could spark a new competition for your business. Heres nbcs tom costello. Reporter verizons new plan is further evidence that the Cell Phone Service business is cutthroat. As americans use their phones for much more than just texting and talking. For 80 a month, verizon now says it will offer an unlimited talk and data plan for any customer who signs up for automatic billing. 180 a month, four phone lines. Unlimited data to text, email, video chat, watch videos, or play games. You might say verizon is following its former pitchman. Sprint will save you a ton. Can you hear that . Reporter who jumped ship, moving to sprint, which along with temobile has been lurg customers away. All Service Providers have a big challenge there are few adults who dont already have a cell phone. I think we can see competitors trying to get your dollars and your subscription in by undercutting each other and trying new ways of billing. How much data do you use . Reporter the new unlimited plan, welcome news for the chris family of six which pays 500 a month for their verizon cell phone bill. A family of six, saving 200, 300 a month, what does that mean . Thats kids college, kids have a lot of needs. That would be huge. Reporter tmobile tweeting, verizons unlimited plan might be the most expensive ever. From sprints ceo, verizon finally admits customers want unlimited data. There is a catch to verizons offer. After using the first 22 gigabytes per month, customers could see their service slow. Tom costello, nbc news, bethesda, maryland. Still ahead, treating lower back pain. New hope for relief without surgery or potentially addicting prescription drugs. Also the grammy moment that still has everyone talking tonight. I will never wash my hair again. I will never never wash my hair again now, i fuel it new pantene doesnt just wash your hair, it fuels it. With the first prov nutrient blend, making every. 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Were pack with Important News for the 80 of adults who suffer lower back pain at some point in life. Before you turn to drugs, injections or surgery, new guidelines say you should try some other things first. Therapies that in the past have been considered alternative treatments. Nbcs kristen dalgren explains. So now all the muscles of the back are being gently released reporter in allison wests class at yoga union they make it look easy. Bend the knees. Reporter you might never know most students are here to overcome often crippling back pain. It is difficult to get out of bed and walk. Reporter monica afessi used to get cortisone injections. Now this is her medicine. Im just feeling better. For me its made a great impact because i know that i can take care of myself now. Reporter in new recommendations out today, the American College of fphysicians says patients should treat low back pain with nondrug therapies first. Things like yoelg ga, massage, spinal manipulation, acupuncture. Im going to repeat what i did on this side reporter this donesh is a Pain Management expert at mt. Sinai hospital. He treats many patients with acupuncture. There is a lot of benefit to it that really is now based in science. I felt very hopeless. Reporter Steven Glickman saw six doctors and tried an epidural for his back pain before trying acupuncture. Where would you be without the alternative therapy . I probably would be considering surgery. Reporter it was once thought surgery or narcotics were the only solution for many. But if drug therapy must be used, the new guidelines recommend advil, motrin, aleve. Aset minute fin didnt help. Open youds should only be used as a last resort. For Steven Glickman, it seemed acupuncture did the trick. Back to life it was amazing. Without all the pain. Were back with a naked truth about a big change fare a major maga i have the worst cold with this runny nose. I better take something. Dayquil liquid gels dont treat your runny nose. Seriously . Alkaseltzer plus cold and cough liquid gels fights your worst cold symptoms plus your runny nose. Oh, what a relief it is. So we know how to cover almost alanything. Ything, even a truckcicle. [second man] how you doing . [ice cracking] [second man] ah,ah, ah. Oh no [first man] saves us some drilling. [burke] and we covered it, february fourteenth, twentyfifteen. Talk to farmers. We know a thing or two because weve seen a thing or two. We are farmers. Bumpadum, bumbumbumbum want lontry. Duo fusion heartburn relief . Duo fusion goes to work in seconds and lasts up to 12 hours. Tums only lasts up to 3. For longer lasting relief. In one chewable tablet try duo fusion from the makers of zantac ques. Are my teeth yellow . Have you tried the tissue test . The what . Tissue test hold this up to your teeth. Ugh yellow. I dont get it. I use whitening toothpaste. What do you use . Crest whitestrips you should try them whitening toothpaste only works on the surface. 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This might caught an argument around the dinner table tonight. According to a new study, firstborn children typically score higher on iq tests than younger siblings. The reason . Parents change their behavior over time, including giving younger kids less mental stimulation, less involvement in activities like reading, crafts and playing instruments. Researchers tested children only until they were 14. Let the argument begin. When we come back, how a neighborly home makeover changed so much for a world war ii veteran. Like a human fingerprint, no two whale flukes are the same. Because your needs are unique, pacific life has been delivering flexible retirement and Life Insurance solutions for more than 145 years. Ask a Financial Advisor how you can Tailor Solutions from pacific life to help you reach your financial goals. All umm. Ed. You wouldnt want your painter to quit part way, i think you missed a spot. So when it comes to pain relievers, why put up with just part of a day . Aleve, live whole not part. You want this color over the whole house . The market. Redict but through good times and bad. At t. Rowe price. Weve helped our investors stay confident for over 75 years. Call us or your advisor. T. Rowe price. Invest with confidence. People spend less time lying awake with aches and pains with advil pm than with tylenol pm. Advil pm combines the number one pain reliever with the number one sleep aid. Gentle, nonhabit forming advil pm. For a healing nights sleep. Hi, im frank. I take movantik for oic, opioidinduced constipation. Had a bad back injury, my doctor prescribed opioids which helped with the chronic pain, but backed me up bigtime. Tried prunes, laxatives, still constipated. Had to talk to my doctor. She said, how long you been holding this in . laughs that was my movantik moment. My doctor told me that movantik is specifically designed for oic and can help you go more often. Dont take movantik if you have a bowel blockage or a history of them. Movantik may cause serious side effects, including symptoms of opioid withdrawal, severe stomach pain and or diarrhea, and tears in the stomach or intestine. Tell your doctor about any side effects and about medicines you take. Movantik may interact with them causing side effects. Why hold it in . Have your movantik moment. Talk to your doctor about opioidinduced constipation. If you cant afford your medication, astrazeneca may be able to help. I never miss an early but with my back pain i couldnt sleep or get up in time. Then i found aleve pm. 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. A Community Coming together to help a world war ii veteran. When he fell behind on his home upkeep his neighbors decided to help with encouragement from a rather unlikely source. Nbcs joe friar with your inspiring america report. Reporter an overgrown lawns worst enemy might be joe garcia, Code Enforcement in petaluma, california. Not exactly the citys most popular profession. When you drive around most days what are you looking for . Were looking for junk properties. Reporter one property in particular got his attention recently. The subject of complaints three years running. But instead of getting a citation hi, how are you . Hi. Reporter homeowner al peracu got a surprising show of compassion. Like human weed whackers, dozens of strangers descended upon his home. Tackling the tough jobs this 90yearold world war ii veteran could not. Thanks. Thanks isnt good enough. Reporter these goodnatured volunteers even mended the inside, replacing the leaky sink and rotting floors. New floor, new paint, new yard. Reporter all of the made possible by garcia, who rounded up the resources with help from jane hamilton, whose nonprofit, rebuilding together, fixes up homes for those in need. Its a nice way to treat people. So rather than come down on them, give them a helping hand. What a difference this morning, huh . Reporter now a spotless yard. Looks pretty good. Oh, yeah. Reporter and a bathroom thats practically good as new. Its amazing. Pretty lucky. Reporter lucky for a city that cares. Well see you, all right . Okay. You let me know if you need anything. Okay. Well see you soon. See you, take it easy now. Reporter a place that knows the best code you can enforce is a moral one. Joe friar, nbc news, petaluma, california. That will do it for us on a monday night. Im lester holt. From all of us at n adele breaks her grammy in two. Lady gaga crashing our interview. Rihanna swinging from a diamond flask. The grammys. Extra, extra extra, extra grammy queen adele going fan girl on beyonce. Pressing restart on her George Michael tribute. Did she let it slip that she secretly married . My husband and my son. We have all the moments you didnt see. On musics biggest night. Blue ivy taking in beyonces baby bump show stopper. Brunos blowout prince tribute. J. Los new interview about drake. Plus the question that had katy perry looking for the exit. My publicist pulling me. Then britney hitting the grammy parties with her new man. A. J. s up all night with new candids. Plus the stars dressing room diaries. Almost done. Alec baldwin takes trump to the peoples court. Overruled. The verdicts in, and the ratings are through the roof. Plus how extras interview with sean spicer turned into this snl punchline. New pics, jen aniston and Justin Therou celebrating her 48th. And casey hayward, j