for a full hour of news. >> we'll celebrate with guacamole, and see you at 6:00. captioning sponsored by cbs ♪ ♪ >> quijano: deadly storms slam the south. fierce thunderstorms and tornadoes leave a path of destruction. >> we're just lucky to be alive. everything can be replaced. >> quijano: across the central u.s. the flood threat continues to rise. also tonight, a newly released memo from democrats shakes up the debate over the russia investigation. an emotional sunday at stoneman douglas high school as students and teachers return to the scene of the massacre. and the winter olympics end with a spectacular ceremony and a possible diplomatic breakthrough with north korea. >> there's potential to turn things around here. this is the "cbs weekend news."

good evening, i'm elaine quijano. severe storms killed at least four people this weekend in the south. a wave of storms from texas to canada unleashed floods, devastating wind, lightning, hail, and tornadoes. a week of heavy rain and melting snow has caused flood emergencies in several states. and the threat is expected to continue into the week. here's tony dokoupil. >> reporter: scenes of destruction like this motel shredded by a possible tornado in north eastern arkansas dotted the central and southern united states this weekend. ( thunder ) as pounding rains, rising rivers and at least eight possible tornadoes ravaged the country. the roof of this home near bowling green, kentucky, caved in, killing a 79 year old woman. >> it was located in the kitchen part of the house. >> reporter: when the ohio river swelled to nearly three times its normal level in louisville, kentucky, and spilled its banks further north where cincinnati, ohio, recorded one of its

wettest days on record. just over the state line in tennessee, newlyweds adam and heather edwards narrowly survived the massive storm. >> we're just lucky to be alive. everything can be replaced. >> reporter: family members say the couple huddled in a closet as winds toppled trees and flipped vehicles outside. >> it started raining real hard and then he saw this barn, the metal from this barn take off. and then the windows busted out. >> reporter: those deaths in arkansas and kentucky on saturday ended a 284 day run without a tornado death in the u.s., the longest streak on record. but elaine, the good news is experts say that streak may not be long. predictions may be getting better. >> quijano: tony, thank you. a newly released memo from democrats on the house intelligence committee is shaking up the debate over the russia investigation. paula reid has the latest from our washington bureau.

>> reporter: house intelligence committee democrat adam schiff says his memo vindicates the f.b.i. over allegations it abused its surveillance power to monitor a former trump campaign adviser. >> the f.b.i. had every reason to be concerned that carter page might become an agent of a foreign power. >> reporter: the document was written as a rebuttal to a republican memo released earlier this month. that version accused the fbi of hiding democratic ties to an opposition research dossier on trump and russia when seeking a warrant to monitor page. president donald trump hit back at schiff in an interview saturday night. >> we'll have a committee meeting and he'll leak all sorts of information. you know, he's a bad guy. but it certainly shows the memo was a nothing. >> reporter: the democratic memo claims the f.b.i. did not solely relying on the dossier. according to the new memo, the f.b.i. detailed page's past relationships with russian spies and interaction with russian officials during the 2016

campaign when seeking to obtain and renew the warrant. the author of the republican mentor, committee chairman devin nunes, doubled down on his claims of politically motivated surveillance during a conservative conference saturday. >> they are advocating that it's okay for the f.b.i. and d.o.j. to use political dirt paid for by one campaign and use it against the other campaign. >> reporter: republicans argued their memo undermines the origins of the russia investigation but so far it has had little impact. special council robert mueller has now secured plea deals with three trump associates and this week filed dozens of new charges. his first trial of former trump campaign chair paul manafort will begin in the fall. elaine? >> quijano: paula reid, paula thank you. it was an emotional sunday at stoneman douglas high school as teachers and students returned to the scene of the massacre. omar villafranca was there. >> reporter: it was a somber return for survivors of the deadly mass shooting at stoneman douglas.

students and teachers returned to campus coping with the reality of what happened here. as a parent are you ready for him to go back to school? >> no, not yet. >> reporter: how come? >> i had to pick him up that day and it was the longest eight hours of my life. and i'm not ready to let him go yet. >> reporter: today governor rick scott called on the florida department of law enforcement to investigate the initial response to the shooting. video from school cameras showed that the armed school resource officer broward county deputy scot peterson stayed outside the building while the shooting was taking place. peterson has since resigned. new reports say other deputies didn't enter the school either. broward county sheriff scott israel addressed the accusation on cnn's "state of the union." >> while this killer was inside the school, there was only one law enforcement person, period. and that was former deputy scot peterson. >> reporter: some lawmakers are proposing change.

florida republican congressman brian mast says he'd support the idea of raising the age to buy a rife to 21. the army veteran also said he would support a ban on the ar- 15, a weapon the former soldier says he's familiar with. >> it pains me to know that i went out there will to defend my country, willing to give everything with almost the exact same weapon that is used to go out there and unfortunately kill children here in parkland. and i think there is a very real opportunity here for response. >> reporter: 74 florida republican state lawmakers have already asked governor scott to remove sheriff israel from his post. but the sheriff from broward county already said he will not resign. elaine? >> quijano: omar, thank you. the parkland massacre has renewed calls to approach gun violence as a public health threat, like diseases or car crashes. over the past two decades the centers for disease control and prevention has been restricted from researching the impact of

guns on public health. dr. jon lapook explains the reason for this and why it could change. >> reporter: what's been sorely missing in the gun control debate so far has been science. and there's a reason for that. back in 1993 a c.d.c. study found homicide was three times more likely in homes with guns. that prompted congress to pass legislation in 1996 prohibiting the c.d.c. from doing any research to advocate or promote gun control. the ban had a chilling effect on all gun-related research by the agency. in 2016, more than 100 medical organizations urged congress to repeal the legislation. after the orlando nightclub shooting that left 49 people dead, i spoke with former congressman jay dickey who helped write the law. he told me he had come to regret its affect. >> reporter: why do you think it's wrong now? >> if we had just kept the research dollars going and we

had said, "science is important and we need to get to it." i didn't realize that it was possible to do that. >> reporter: dickey died last year but his legislation continued. and last week following the school shootings in florida, congresswoman kathy castor pressed health and human services secretary alex azar about the lack of research. >> will you be proactive on the research initiative? >> we certainly will. our centers for disease control and prevention, we're in the science business and evidence generating business. >> reporter: this week, two republican congressmen, leonard lance of new jersey and brian mast of florida, called for restoring c.d.c. funding of research into gun violence. it remains to be seen whether that will snowball into actual repeal of the dickey amendment. dr. jon lapook, cbs news, new york. >> quijano: the winter olympics ended today with a spectacular ceremony and a possible diplomatic breakthrough.

north korea said it is willing to hold talks with the united states. more now from ben tracy in pyeongchang, south korea. >> reporter: there were fireworks all around the olympic stadium during the closing ceremony of the games. but inside it was a picture of peace. athletes from both koreas marched together and north korea's delegation was seated just behind ivanka trump. she is here representing the united states. putting on a successful olympic charm offensive. >> it's very similar to what kim jung-un did by sending his younger sister. she's a softer face. >> reporter: jean lee is an expert on korean relations. she says the olympics has opened up communication between the two koreas and now potentially the united states. >> this is a moment that i hope the south koreans and americans recognize. there is potential to turn things around here. >> reporter: south korean president moon jae-in, the head of the delegation general kim yong-choi told him they are

willing to talk to the united states that would be a sudden about face. the u.s. says the north koreans pulled out of a meeting with mike pence at the last minute during his visit to south korea two weeks ago. ( explosion ) but tensions could get in the way of talks if planned military exercises are carried out after the games. the trump administration also just imposed tough new sanctions on north korea and has provided only vague support for a summit between north and south. an offer made by kim jong-un. >> reporter: does president trump support the leaders of south korea and north korea

every week hundreds of rohingya muslims are still crossing over the boarder from myanmar, formerly burma, into bangladesh. since august nearly 700,000 have fled their homes escaping a brutal military crackdown. our digital network cbsn investigated the crisis and found that social media is being used as a weapon against the rohingya.

>> the scale of this is unprecedented. never seen anything like this. >> everywhere you go people have these horrible, horrible stories and they have the scars to prove that happened. >> the horrific violence has been collectively overwhelmingly denied by so many people. >> social media has been i think one of the most damaging aspects of this entire crisis. >> there's a real chill in the air that you can just feel. >> quijano: the new cbs documentary "weaponizing social media: the rohingya crisis" premiers tomorrow night on our streaming network cbsn at cbs news.com.

coming up, insights on gun control from a country that has nearly eliminated shooting deaths. and later when they look at their diet, the virtual reality goggles, they see the light. and the wolf huffed and puffed... like you do sometimes, grandpa? well, when you have copd, it can be hard to breathe. it can be hard to get air out, which can make it hard to get air in. so i talked to my doctor. she said... symbicort could help you breathe better, starting within 5 minutes. symbicort doesn't replace a rescue inhaler for sudden symptoms. symbicort helps provide significant improvement of your lung function. symbicort is for copd, including chronic bronchitis and emphysema. it should not be taken more than twice a day. symbicort contains formoterol. medicines like formoterol increase the risk of death from asthma problems. symbicort may increase your risk of lung infections, osteoporosis, and some eye problems. you should tell your doctor if you have a heart condition or high blood pressure before taking it. symbicort could mean a day with better breathing.

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>> quijano: while american lawmakers debate gun control activists in other countries are suggesting measures that have worked with they live. roxana saberi visited dunblane, scotland where a mass shooting in 1996 led to big changes. >> reporter: 22 years since the gunman opened fire at dunblane primary school in scotland. >> she was killed. >> reporter: mick north relives that tragedy with each mass shooting in america. >> you tend to pick up on things that relate to what has happened in your own life. >> reporter: north's daughter sophie was one of the 16 children killed in dunblane. >> i just said no more guns. turned out that i wasn't the only one.

>> reporter: he and other parents pushed politicians to prohibit private handguns. today britain has some of the strictest gun regulations in the world. >> if you want to buy a semi- automatic weapon or handgun at a shop in britain, you can't. they are now both banned. and if you want to buy a high- end shotgun like one of these that could take up to six months to clear all the regulations. >> you can only use manually loaded rifles and shotguns for hunting or hobbies at shooting clubs like this one in london. member sherman stroble says the police will also visit your home to make sure you store your gun in a safe like. this and may ask your doctor about your mental health. >> if you had depression or anything like that you will not get a firearm, ever. >> reporter: since 1996 shooting in dunblane, britain has experienced only one deadly mass shooting. while the u.s. has had more than 75.

>> our response in the u.k. matched the culture here which is not one that particularly wants ownership of guns. >> reporter: and the u.s.? >> reporter: north now has a message for the florida students calling for more action. >> keep reminding people what happened to you. don't take any notice of people who say, "well, you're only teenagers." >> reporter: do you think these kids can really make a difference? >> i sincerely hope they can. >> reporter: in 1996 the same year as the shooting in dunblane, a gunman in australia killed 35 people. that lead the country to pass sweeping gun reforms. germany did the same after school shootings in 2002 and 2009. in those countries gun violence did not disappear but deadly mass shootings are very rare. elaine? >> quijano: roxana, thanks. still ahead, through virtual reality they are changing their minds and helping their hearts. greatness... lives within all of us.

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a doctor in los angeles is tackling the problem through virtual reality. giving patients an eye-opening view of the damaging effects of salt inside their bodies. mireya villarreal looked into this. >> reporter: for juanita cannon controlling her blood pressure has always been a priority but at this night she was given a virtual look inside herself. >> oh lord. >> reporter: and was shocked by what she saw. >> 2,000 milligrams, my god. >> reporter: when you see all that salt intake, what is that first reaction? >> oh my god. if you look at one dish, and then you look up and it will tell you how much sodium is in that dish, that brings it to life. >> reporter: through a virtual reality app she was able to see a three dimensional simulation of how salt could corrode her pumping heart and lead to high blood pressure and possibly a heart attack. >> when you actually see what is going on, that opens your eyes. >> reporter: african-americans develop high blood pressure at a

younger age than any other ethnicity with 46% of all black women diagnosed with high blood pressure. dietary guidelines suggest less than 2,300 milligrams of salt a day but lasagna alone has 2,800 milligrams of salt, a fast food hamburger has 970. >> some people would hold the goggles out here and we said no, it goes right up against your eyes. >> reporter: dr. brennan spiegel knew virtual reality would have the greatest impact on changing behavior. >> you don't realize how it can just nudge your brain, take hold of the emotional centers and not let go. >> reporter: after 12 weeks in cedar sinais medical center program this group's average blood pressure dropped seven points with some people's systolic blood pressure dropping as much as 57 points. >> i am modifying and i am changing. >> reporter: so now juanita cannon has seen the light. >> i'm just amazed. >> reporter: about salt. mireya villarreal, cbs news, los angeles.

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be found amongst imports in the south but brew pubs like magpie in seoul might not exist without it. >> it if wasn't for the korean beer being compared to north korean beer, than maybe it never would have lit the spark that it did. >> reporter: that spark came from a 2012 magazine article in the economist called fiery food boring beer. praising the suds from the north while trashing the south. >> they say like the day after that article was published every brewery in korea got a phone call from the government saying what are we doing wrong. >> reporter: magpie founder eric moynihan said relaxed liquor laws followed a you lag smaller batch brews and igniting the south korean craft beer scene. how would you describe what craft beer means to south korea? >> before it was sort of an international product that was here and now people are starting to see it like this say locally made product. we can put our own stamp on it. >> reporter: why brew here in korea? >> if i could be honest, i would say the beer was not very good. >> reporter: phillip rankmore part owner of gangneung brew

pub. reporter: the building itself is an old rice wine factory. his beers the work of be all- korean staff give a nod to the local community. >> the original name. >> reporter: whether it's the names or ingredients, it's rankmore way of putting a spin on budnamu beer. >> reporter: the local ingredients, even rice, we actually use that in our beer as well. >> reporter: creating a new tradition to share with south korea, and perhaps one day the world. dana jacobson, cbs news, seoul, south korea. >> quijano: that is the "cbs weekend news" for this sunday. later on cbs, "60 minutes." the news continues on a 24 hour streaming channel cbsn at cbs news.com. for all of us at cbs news, thank you for joining us and good night. captioning sponsored by cbs captioned by media access group at wgbh

erupts in assault rifle fire. tonight: shooter -- is on the run. live from the cbs bay area newsgroup this is kpix5. heavily armed police surrounded a suspects home for hours this morning but somehow he slipped away. it happened in menlo park last night. nearly 20 hours later investigators found an important clue but not the suspect. >> reporter: it all started with a lively backyard birthday party around 11:00 last night with about 30 guests, plenty of food, good conversation and loud music. but one of the guests he over the back fence and saw a neighbor pacing back and forth with an ar assault driver.

it was gutierrez. he had a large magazine loaded in the weapon. he fired one shot into the ground. the partygoers did not want to talk on camera but they went inside and called 911. >> jose gutierrez, this is the san francisco police department. >> reporter: heavily armed police officers surrounded the house through the night. the s.w.a.t. team began firing some sort of rounds into the house by the morning. a sniper was posted on the roof of a neighboring house. at some point gutierrez slipped away and was not inside by time they went in. for a neighbor it was a long night.>> reporter: did you get a lot of sleep last night? >> oh no. we did hear that first gunshot. after that there was a lot of cups. >> reporter: neighbors tell us he lived in a unit in the