communities. residents are rattled awake by sirens and rushed to evacuate. >> we could not get them out fast enough because the water kept going up so fast. plus, nearly 100 million baking across the u.s. e.r. visits skyrocket. rip currents turned deadly. at least seven people killed or missing after being swept off the coasts of new york and florida. >> this is a tragedy. this is a parent's worst nightmare. >> what you need to know before your next trip to the beach. police identify the alleged gunman behind the supermarket rampage in arkansas. three killed. ten injured. what's authorities reveal about his motive. former president trump says he's made his choice for vice president, but hasn't told anyone yet. nbc news reveals the final three contenders. a massive cyber attack crippling car dealerships nationwide. why it may be harder to get the car repaired. powerful new images. the hiker lost in the mountains of california for ten days finally found. and the fisherman who rescued dozens of dogs from drowning in a lake. how did they all get there? >> announcer: this is nbc "nightly news" with jose diaz-balart. good evening. a huge portion of the country is baking right now under a heat dome that's not letting up. weather patterns over much of the u.s. are simply stalled. other parts of the country are trapped under severe storms. this is what happened in north western iowa today. residents woken up by sirens designed to alert people to tornados, now warning that a levee had broken and flood waters were rushing towards them. entire communities evacuated. many residents had to be rescued by boat. meanwhile, the heat indexes in parts of the east coast hit 109 today. and if you're hoping for relief soon, you may be out of luck. take a look at this. 260 million americans will have temperatures above 90 for most of next week. george solis is covering it all from a sweltering philadelphia where temperatures hit 99 today. [ sirens ] imminent flooding after a nearby levee broke. the water too much to contain. >> we could not get them out fast enough. >> reporter: frightening moments as tornado sirens blared overnight in rock valley, iowa, warning residents to evacuate immediately because imminent flooding after a nearby levy broke. >> we could not get them out fast enough. >> reporter: rescue crews quickly mobilizing to try and evacuate people from some 500 homes. >> there was a couple people on their roofs because it was the only place they could get to. >> wow, what a mess, guys. >> reporter: heavy rains for days forcing rivers from their banks. from the air, harrowing scenes like these. entire neighborhoods under water. with a flood emergency already in effect this afternoon governor kim reynolds extending a disaster declaration for some of the hardest hit areas. meanwhile, extreme heat gripping parts of the country. more than 100 million people under heat alerts from california to new york with some places it feels like it's more than 100 degrees. cities like philadelphia are sweltering. on a scale of one to just torture what would you rank this heat at right now? >> for me, torture. >> reporter: today baltimore hitting a record 101 degreesng . >> it's been terrible. i've just been making sure i've been staying inside. >> reporter: the heat turning deadly in idaho. officials there reporting two heat-related deaths. the cdc is tracking extreme heat across the country in realtime. last year saw more than 2,300 heat related deaths, up from years prior. and hospitals across the country are bracing for more patience as the extreme heat just won't let up. are you seeing a spike in patients coming in with heat related injuries? >> right now we are seeing a spike. it's a little bit of a mixed picture with patients who have chronic medical problems, and their problems are being exacerbated by the heat illness, too. >> george joins us from philadelphia tonight. and they could see a record broken there this weekend, george? >> reporter: that's right, jose. we have the thermometer at the ready to confirm it. the forecast expected heat expected to reach 98 degrees, which if true would break a more than 130-year record here in the city of philadelphia. jose? >> george solis in philadelphia, thank you. and breaking news about another deadly summer danger, rip currents now blamed for a rash of drownings in the past two days. marissa parra has the latest on what you need to know to stay safe. >> reporter: tonight a heart breaking start to summer in new york. at jacob reef beach in queens search and rescue from land, air, and sea looking for two missing teenagers swept away by dangerous waters and never resurfacing. >> it's a tragedy. this is another parent's worst nightmare. we think that it might be a riptide, but that's still under investigation. >> reporter: rurf posing challenges for even the most experienced rescuers. >> ts are extremely, extremely rough. the divers had to come out of the water because the current was extremely dangerous. it was too rough for them. >> reporter: florida has already seen two deadly swimming incidents within two days. overnight tragedy striking in panama city beach. police say three tourists were swept away in a rip current launching an all-out search and rescue mission for harold hunter, jemonda ray, and marius richardson. none of them survived. this after a rip current took the lives of a mother and father of six across the same state in steward beach just one day earlier. >> the kids one or both got caught in the riptide and brian and/or erica went after them, and the other -- they both went after them and they got the kids out, and they got caught. >> reporter: family of brian and erica say they were athletic and strong but no match for the dangerous waters. ihi were to come of this, it is that people are aware of how dangerous rip currents can be. >> reporter: rip currents are a powerful channel of water formed when waves break near the shoreline, and they're often hard to see from the ground. but signs like a line of white foam or a narrow passage of darker water in the ocean can be clues of a rip current that could save lives of even the strongest of swimmers. >> marissa joins us from hutchinson island, florida. marissa, there's still a risk for rip currents on the east coast. >> reporter: there is a heightened risk of rip currents in the state of florida through sunday and into the middle of the week for the mid atlantic. jose? >> marissa parra in hutchinson island, florida, thank you. we have new it tails tonight about a shooting rampage in an arkansas town that left three dead, ten others injured. authorities now naming a suspect. priya sridhar is there. >> reporter: first responders in this small town today washing away the bloody remnants of yet another deadly mass shooting in america. spraying down the parking lot outside a mad butcher's grocery store, the scene of yesterday's shooting rampage that left inc enforcement officers. three dead and ten orthers wounded, including two law enforcement officers. authorities identifying the alleged gunman as 44-year-old travis eugene posey, who's facing at least three charges of capital murder. the suspect now held at a local jail after being wounded himself in yesterday's shootout. >> it's just really overwhelming. >> reporter: angela says her mother shirley taylor was one of the victims killed. what has the last 24 hours been like for you? >> total hell. she was our rock. >> reporter: also killed, 23-year-old callie weems, grocery shopping on a day off from her job as a nurse, according to her mother, leaving behind a 10 month old baby. >> wailing and screaming because my daughter's 23 years old. this isn't supposed to happen to her. >> reporter: nbc news also confirming the third victim killed as 50-year-old roy burton sturgis, according to his daughter. this graphic video appears to show a man with a long gun pointing and shooting at cars in the parking lot outside the grocery store friday, though, police have not verified it is the suspect named in the case. >> it was rough, man. i seen people lying in the parking lot, didn't know if they were dead or not. >> reporter: this arkansas community now among the latest trying to find peace in the aftermath of senseless gun violence. >> priya joins us now from the scene of the shooting. priya, what more have we learned about the motive in the shooting? >> reporter: well, law enforcement officials who were briefed on the shooting tell us there are no indications of any sort of extremism as a motive. jose? >> priya sridhar, thank you. to politics now and the high stakes debate prep ahead of next week's presidential showdown. joe biden cramming this weekend while donald trump is out on the campaign trail. and we have new details on his top contenders for vice president. dasha burns is on the campaign trail in philadelphia. >> reporter: as debate night approaches, a contrast in preparation. former president trump campaigning tonight in philadelphia. >> i think this is prepping. these people know better than anybody what they want. >> reporter: and on the stump -- >> nobody's going to be watching the debate on thursday night, right? nobody. will anybody be watching? >> reporter: sources tell nbc news campaigning is his debate prep along with some informal policy sessions with advisers and members of congress focusing on inflation and immigration. >> how is debate prep going? >> reporter: while president biden is hunkered down at camp david for intensive prep sessions led by former chief of staff ron klain that will include mock debates. playing the part of mr. trump is former white house counsel bob bauer who took on the same role back in 2020. the president looking to focus thursday night's debate on abortion rights and what his campaign says is trump's record of undermining democracy. tonight trump saying his yet to be named running mate will be at the debate and that he's made his choice but hasn't told anyone who it will be. >> have you picked a vice president? >> in my mind, yes. >> reporter: sources tell nbc news the focus has been on three top contenders. florida senator marco rubio ran against trump in 2016. >> what we are dealing with here, my friends, is a con artist. he is a con artist. >> reporter: before entering politics, ohio senator jd vance adamantly opposed trump. >> i'm a never trump guy. i never liked him. >> reporter: and north dakota governor doug burgum briefly ran against him for this year's nomination. >> would you ever do business with donald trump? >> i don't think so. >> why? >> i would -- i just think that it's important that you're judged by the company you keep, and i -- >> you just wouldn't do business with him? >> no, i wouldn't. >> reporter: all three vp contenders are now loyal allies of the former president. sources say the campaign wants a candidate who won't overshadow mr. trump but also someone who could be the future of the republican party. >> dasha joins us now from a trump rally in philadelphia. dasha, what have we learned about when mr. trump may announce his running mate? >> reporter: jose, the campaign is still deciding whether to announce before or after sentencing for his conviction last month. sentencing is set for july 11th, just days before the republican national convention. jose? >> dasha burns in philadelphia, thank you. and you can watch that first presidential debate thursday night right here on nbc. a trip back to earth has been delayed for two american astronauts aboard the international space station. astronauts butch wilmore and sunita williams blasted off on boeing's starliner earlier this month, were supposed to return last week, but they're staying to study some technical issues that developed with the spacecraft, so the starliner is now scheduled to head home next week. still ahead tonight, emotional home coming for an american arrested in a tropical island paradise. plus, catch of the day. the fisherman who had to fetch all these dogs from the water, saving their lives. to fetch dogs from the water, saving their lives. nding you. 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that's gretchen walsh shattering the 100-meter butterfly world record last week during the u.s. olympic swimming trials in indianapolis. what a reaction. it was part of a weekend of wins earning her a spot on her first u.s. olympic team, a dream come true for the 21-year-old true for the . and talk about a joyride a. hundreds of students and staff lined up as far as the eye could see to honor teacher kathy lyczynski who's retiring from baker elementary near boston after 16 years years.. you see just how much they all love mrs. l. the emotional send-off arranged by principal valerie brower was a bittersweet light after kathy recently lost her husband, gene. kathy, how does that community behind you help mitigate the pain? >> oh, it's very supportive, extremely emotionally supportive. the school is like a family and we treat each other like family. >> valerie, have you been surprised at how much reaction there's been? >> we knew it was going to be special. as a school that's what we do for each other. kathy certainly deserved it. >> the kids always say thank you, mrs. l. like at the end of class, and i please just treat each other kindly. that's how you thank say, please don't thank me. please just treat each other kindly. that's how you thank me. >> and great news kathy is expecting her very first grand baby in september. that's nbc "nightly news" for this saturday. i'm jose diaz-balart. thank you for the privilege of your time, and good night. diaz-s there. we're hearing from the new police chief, and as we track the heat, we've got some updates on some of the biggest wildfires burning in the state that are bringing haze to the bay area but i didn't bring anything because i thought i was doing a three hour hike to go to work. and still ahead tonight, hearing from the man rescued at big basin. amazing story. after being stranded in the woods for more than a week. good evening. we begin with that hot weather across the bay area this weekend. this is a live look right now from our cameras in san jose and the east bay. and