An el nino warms the ocean, and this one could be Strong Enough to bring onceinageneration storms to the west and change the Weather Coast to coast. Heres John Blackstone. Reporter this was the winter of 199798. San francisco had its wettest winter in 120 years. Los angeles got nearly a years worth of rain in just one month. Snowfall in the mountains was double the average. 17 people died. El nino was to blame back then, and an Even Stronger el nino is developing right now. Climatologist bill patzert over the next three months, this should turn into what i call a godzilla event. Reporter el nino is characterized by a mass of unusually warm ocean water stretching across the pacific to south america. Last month, the mass of warm water on the right appeared broader than it did in 1997. If it continues to build, this will have a tremendous impact, not only over north america but over the entire planet. Reporter in the united states, a strong el nino could bring more precipitation across most of the south and up the east coast. Northern states are likely to have a winter that is drier and warmer than usual. Californians know el nino can bring both bad and good. After years of drought, they are praying for rain. Are our prayers going to be answered . I think theyre going to be answered, and i dont think it will be too much of a good thing. Reporter meteorologist john monteverdi warns, however, that with el nino, there are no guarantees. Weve had strong el ninos where the storm track either went north to alaska or went into mexico. Reporter if predictions are true, el nino rains could start hitting california by late october and last into the spring. But, scott, the forecasters warn that even this strong el nino may not be enough to make up completely for four years of severe drought. Pelley John Blackstone in the city by the bay this evening. John, thank you. We have remarkable new video of yesterdays tremendous explosions in tianjin, china. The chinese are saying this evening that 50 are dead, but that is sure to rise. At least 700 are injured, dozens are missing. The blasterupted at the seaport in a warehouse for hazardous materials, and seth doane made it there today. Reporter this stunning video, taken by a drone, gives an aerial view of the aftermath. The skeleton of burned buildings, shipping containers smoldering, acrid smoke belching into the sky. More than 1,000 firefighters were sent in, but they were stopped as authorities tried to figure out which chemicals were burning and their risk. Take a look at this building. This is the side facing the blast. Every single window is blown out. The second explosion had the power of more than 20 tons of t. N. T. Reporter kelly wang and nathan liu didnt have time to collect their belongings. You can describe the explosion . Everybody just ran out, she said. We saw fire in a mushroom cloud. Its terrifying, very terrifying. Victims filled hospitals, many had wounds from flying glass. The blasts were so powerful they registered as earthquakes. And produced fireballs so big, they were seen in outer space, pictured as a growing green mass in a sea of white clouds. The explosions burned hundred of new cars to their shells. Some pictures and posts about the blasts were deleted from social media by chinese censors as authorities tried to control the narrative. Were just trying to shoot in front of a hospital. Were not trying to do that much but as you can see, the police here are trying to stop us from shooting. This is what its like covering a story here in china. Police blocked access to the blast site. Residents were not allowed to return home, and local tv stations gave little coverage to the story. There is no word yet on what caused the disaster, but, scott, calls for accountability go all the way up to chineses president who has demanded severe punishment. Pelley seth doane in beijing for us tonight. Seth, thank you. Today, colorado rivers are said to be recovering after the accidental release of three million gallons of mining waste. But Mireya Villarreal found that what lies beneath the surface remains a stubborn problem. Reporter thats the color that came through the middle of the river. Right. Brighter than that. You know, a lot of the red and yellows in here might be iron oxides, or other contaminants. Reporter Sinjin Eberle of the american rivers advocacy group, says as a result of this spill, dangerous heavy metals like arsenic, zinc, and led have settled to the bottom of the river and on the banks. This is a river that really rages under a lot of water, and so the concern is that violence of the water passing through will churn up a lot of the sediments that are sitting on the bottom of the river. Reporter today, e. P. A. Administrator Gina Mccarthy acknowledged testing thats at the bottom is at the top of their list. The sediment is where that longer term responsibility is for this agency, and we will meet that responsibility. Reporter the river is still closed. We had to get permission to wade in. But colorado governor John Hickenloooper took a drink of the water to prove the quality is back. He did, however, use an iodine bill to kill off bacteria. Officials say this section of the animas has not been suitable for drinking for decades due to contamination from previous mine runoff. We need to do best to clean up and isolate water from as many of these mines as we can. Reporter but eberle warns the damage beneath these waters will not go anyway any time soon. How long will these metals stay in the river . Heavy metals do not degrade very quickly. These metals will linger in the environment for centuries. Reporter the e. P. A. Is now delivering a half as Million Dollars worth of waterra to new mexico for irrigation purposes. And, scott, on top of that, local officials are hoping to open up this river by monday. Pelley Mireya Villarreal, thanks very much. Tonight, the private email server that Hillary Clinton used as secretary of state is in the hands of the f. B. I. Whats on it may be nothing. What was on it . Thats what theyd like to find out. And heres nancy cordes. Reporter the server the f. B. I. Picked up was stored not at the clintons chappaqua, new york uhome as many assumed but at a data center in new jersey. A lawyer for platte river networks, the i. T. Firm that manages the clintons email system, told cbs news that the server was moved to the new jersey facility some time after clinton left the state department, when the clintons upgraded their system. The lawyer said the old server is now blank and likely does not contain usable information. You can eliminate data from any sort of hard drive or server. Someone may be able to recover it depending how good they are and how good a job you did deleting it in the first place. Reporter cnets dan ackerman says the most common method for wiping data clean is to overright it multiple times. Almost as if you write something on a chalk board and then you eerate raceit, then write over it, then erase it. Eventually no matter how closely you look you will never be able to see what the original thing was you wrote. I didnt see any reason to keep them. Reporter the Inspector General for the Intelligence Community says a review of the just 40 of her workrelated emailed yielded four that contained classified information and thus should never have been transmitted have a an like a home server. If you have any sort of device connected to the internet, youve created a pathway into it. Reporter the Inspector General also says two of those four emails should have been considered top secret in part because they contained satellitebased intelligence. Keep in mind, scott, that determination was based on a review of just onetenth of 1 emails. Pelley nancy cordes in washington tonight. Nancy, thank you. Tonight, we have learned that counterfeit tourniquets are finding their way into the and police. The fakes break easily, which could leave an accident victim bleeding to death. Jeff pegues found a bulletin for law enforcement. Reporter this bulletin went on to New HampshireFirst Responders after paramedics experienced a catastrophic failure with two counterfeit tourniquets at the sceneave motorcycle accident. Sources say a rod like this snapped in half as the parmet medics tried to stem a hemorrhage on a victim with a leg injury. That made it impossible to tighten the tourniquet air, failure that could prove fatal. The counterfeits were knockoffs of the combat application tourniquet, or c. A. T. Cats are made by a Company Called north american rescue. If vase it has sold nearly 13 million tourniquets to the military and First Responders over the last decade. During the wars in iraq and afghanistan, tourniquets proved so life saving that the u. S. Military tried to give one to every soldier on the battlefield. In late september, the Obama Administration will roll out an initiative to put tourniquets in public places, Office Buildings and schools. But with fake tourniquets, some possibly made in china, being sold online for a third of the actual price, manufacturers fear the knockoffs will end up in the publics hands. Ross johnson is a former special forces officer and c. E. O. Of tourniquet distributor tactical medical solutions. The concern for us is that uneducated buyers, whether they be a contracting officer for a municipal government or just an individual citizen, is going to think theyre doing the right thing, and supporting the white house initiatives, but inadvertently putting out a product thats unsafe. Reporter he says the counterfeits look remarkably similar to the real thing and that is part of the danger here. Scott, we wanted to know how the counterfeit tourniquets got into the hands of New Hampshire paramedics but we have not received an answer to that question. Pelley jeff pegues break the story for us tonight, thank you. Today, Cubas Fidel Castro celebrated his 89th birthday, and tomorrow, secretary of state john kerry will raise the stars and stripes at the reopened u. S. Embassy in havana. But many who fled castros revolution want more than just a ceremony. Margaret brennan reports they want what they left behind. Now, all of these things had been taken over by the government. Reporter lois and roy schechters life in cuba ended at gunpoint when castros soldiers barred them from their farm. Soldiers were there. He spoke to them and got in the car and drove away. That was the end of the farm. Reporter why wouldnt the soldiers let you into the farm . They had taken it over. They had nationalized it. Reporter the castro government seized property from the wealthy, including hundreds of americans. The schechters had been on the island for 60 years and lived in this 17room home. Its now in a guarded Diplomatic Enclave and occupied by chinese officials. This building used to house a successful shirt factory owned by the schechters, but it, too, was taken. And by 1961, the family had no choice but to pack up and leave. Lois smuggled a few prized pieces of jewelry inside her sons diapers. And i figured if anybody wanted to get what was in here, they would be welcome to take it. Reporter the family believed what theyd lost was gone forever. But now, 54 years after she fled, lois and her daughter, amy, are working from their new york home to reclaim their havana properties. I would like to see reparations. If we have relations with cube ai dont think we should have them without the reparations. Reporter the schechters lawyers estimate the value of their claims at over 8 million. But you feel that money that the castros owe you . Yeah. You know, it was the familys. Reporter with cubas weak economy, its unclear how it would repay claims, even if diplomats agreed to it. And, scott, havana wants the u. S. To pay more than 300 billion worth of damages it said it suffered due to the embargo and seized assets. Pelley Margaret Brennan in havana tonight. Margaret, thanks. Theres a revolution coming in making purchases with a smartphone. Somewhat when cbs evening news continues. [music] jackies heart attack didnt come with a warning. Today her doctor has her on a bayer aspirin regimen to help reduce the risk of another one. If youve had a heart attack be sure to talk to your doctor before you begin an aspirin regimen. Unbelievable toenail fungus . Seriously . Smash it with Jublia Jublia is a prescription medicine proven to treat toenail fungus. Use jublia as instructed by your doctor. 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Our vision is for you to be able to digitize all of your credentials inside of a secure container, which is your mobile wallet and your phone should be safer than your leather wallet. Reporter John Heggesteun is a Senior Research analyst with business inside. He says current alps like android and apple pay only work on specialized credit card terminals which are in limited use. How much a game changer is this . Its huge. If you start to use samsung pay youll be able to use it everywhere. Reporter for security, samsung pay requires a finger print or pin number and the actual card number is never revealed. Instead, the phone gen raits a number that only gets used once. There it is. Reporter but there could be privacy issues. The phones collect and pass along data on purchases, store loyalty, and discount cards. Is there a danger, though, in having so much of us in one device like that . I think when a device can bring you convenience and it can bring you higher levels of security, then its natural that you want to depend on those kind of devices to do those things for you. I think its part of the future. Reporter if youre worried about the phone tracking your history, you can choose to opt out of that feature. Scott, samsung might not have the advantage for long. Most businesses are expected to upgrade to the credit card terminal that also works with apple and android. Pelley don dahler. Thank you, don. Up next, a sketch artist is drawing some ugly criticism. The 1 prescribed acidblocking brand, and get all day, all night protection. Nexium level protection. Theres something out there. Its a highly contagious disease. It can be especially serious even fatal to infants. Unfortunately, many people who spread it may not know they have it. Its called whooping cough. 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Ask your gastroenterologist about humira. With humira, control is possible. Pelley have a look at this. This is star quarterback tom brady, and this is a widely criticized sketch of him as he appeared in court yesterday. Here now is the artist testifying in her own defense. Hi, my name is jane rosenberg. Ive been a courtroom artist for 35 years. Hes a very handsome person. Hes perfectly symmetrical and when im working fast its very hard for me to capture very beautiful people. I do better with people with more caricature faces bernie madoff, martha stewart, woody allen. I didnt know how much time i was going to have. It could have been five minutes and it would be all over for the day. This whole thing has gone viral and people are making cartoons of the sketches. I really like the Michael Jackson one. And i saw the scream. Some of them made me laugh. Theyre actually very funny. Im not perfect and i think athletes understand you have good days and bad days and people just do the best they can. Youre very hand smed. Im sorry if my sketch didnt make you look as good as you look. Ill try my best next time. Pelley next time will be next week when brady is back in court appealing his suspension for deflategate. D. N. A. Has rewritten a piece of president ial history. After Warren Harding died in 1923, nan britton wrote a book claiming she had been his mistress, theyd made love in a white house closet and hed fartherrerred her daughter, elizabeth. Harding supporters denied it, even claimed he was sterile, but now d. N. A. Testing just released by ancestry. Com shows that the president was swrbzs father. Chicago. The story behind them next. Become especially important. From the makers of one a day fiftyplus. New one a day proactive sixtyfive plus. With high potency vitamin b12. And more vitamin d. When youre living with diabetes, steady is exciting. 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Ask your doctor about orencia. Orencia. See your ra in a different way. Pelley murders in chicago are up 21 in year, but in one part of town, they are down 14 . There, adriana diaz tells us, signs of a turnaround are all around. One, two, three reporter the sounds of childhood are making a comeback on yvonne marshalls block. All you hear is children laughing and playing. Reporter the grandmother of five credit these desperate pleas on plywood, dont shoot, kids at play. Let the kid grow up. The signs showed up on bishop avenue in late may after fouryearold Jacele Johnson was shot in the head nearby. The little girl survived, but in the last five years, more than chicago. Funerals. How often did you used to hear gunshots in your neighborhood . Week. Reporter but since the signs, there hasnt been a single shooting on these two blocks. Who was involved in putting up that sign . We all were. Reporter the calls for peace came from these former gang members. We felt it was needed. So many kids losing their lives at a young age. Reporter joe walker, dwan brown, and their friend grew up here. Now they have children of their own. We was trying to make it, like a surprise for the neighbors too. And when we put them up, that i was like, unbelievable. Unbelievable. Reporter it may have been their innovation, but the motivation came from a meeting with Chicago Police superintendent garry mccarthy. He routinely calls in gang members and parole ease after shooting. We introduce them to the concept of group accountability. Reporter that means if a kid gets shot, everybody in the area will feel the heat. We cant be accountable for what happens in the other block but we can be accountable for what happens over here. So what can we do different . The signs. Reporter with all the hightech resources at the polices disposal, its these crude, plywood signs that neighbors say have made the difference. Dont care if it was done in crayon. If its spray paint on a piece of cardboard and its effective, lets get more spray paint and cardboard. Reporter the hope here is that the signs spread torg troubled blocks so kids can be kids and play outside. Adriana diaz, cbs news, chicago