the dow jones industrial average plummeting 530 points, or 3%. that's a 1,000 point loss for the week. and it happened against the backdrop of what indications show to be an improving u.s. economy. helping us make sense of it and what it could mean to your boom line, here's nbc's tom costello. >> reporter: on wall street today a rout, capping off a month of pain with americans' pensions and 401(k)s in a sea of red. >> the dow jones industrial average having its worst day in four years today, dropping 528 points. this is the worst week for the dow since 2011. >> reporter: the dow, s&p, and nasdaq all in a nose dive. the dow has now slid 10% from its all-time high. e biggest reason for the sell-off is a world away from america's main streets. the chinese economy is slowing fast, and we live in an interconnected global economy. >> how bad is china? >> it's worse than you think. whatever you might think, it's worse. >> reporter: last week china devalued its currency to make its exports cheaper, sparking concerns of a currency war with the u.s. >> we don't know whether or not they have the capability to contain their own problems. there's been a lot of there's been a lot of bad investment. there's been a lot of investment that's been made there. we don't quite understand how it all plays out. weighing on the markets, the dramatic slide in oil prices, now at a six-year low, below $40 a barrel. good news at the pump, where prices are expected to drop to $2 a gallon by the end of the year. already $2.19 at this station in dallas. >> the cheaper the better. >> reporter: but it's bad news for big oil companies, many of which are now laying off employees. big oip company stocks have been hit especially hard on wall street. so what should americans with money in the stock market do now? experts say it may be best to wait it out. >> you don't want to panic. panic is not an investing strategy. you also don't -- you shouldn't feel compelled to make a decision about investing at a moment in time. in other words, what do i do right now. >> reporter: the situation in china and the stock market sell-off may convince the fed not to raise interest rates as expected next month. in fact, some experts think they may now be on hold through the end of the year. lester? >> tom, thanks very much. let's bring in cnbc's sue he rera. all those things tom ticked off, the chinese economy, oil price, those are going to be in effect monday as they were today. are we looking at a short flash here or a sustained longer-term slump? >> i think it is probably, lester, going to be longer-term because our market is watching the chinese officials so closely. we're kind of dependent on how they decide to manage their own economy and their own market. also, august is traditionally a very volatile month and it certainly is proving that out to be true. so the analysts that i'm talking to say at least the next few weeks expect more volatility and probably more down side activity in the market and then we're going to be going into the fall, which also traditionally has some ri tsk in it as well. you have to reall sfigure out what your risk tolerance ch, if you're going to be in the stock market, lester. >> sue herea tonight. thank you. tonight the president has declared a federal emergency in washington state. a major disaster as wildfires continue to explode. growing again overnight. threatening homes. the situation is getting so desperate officials there are now asking for volunteers to help in the fight. nearly 100 fires now burning in the west. our national correspondent miguel almaguer reports from the front lines. >> reporter: in parts of washington state devastation. more evacuations. more homes lost every day. >> it's all burning now. and we don't have the resources available. >> reporter: with smoke billowing into the sky, unhealthy air alerts issued in several states, whipping winds are fueling fast-moving fires, burning more than 100 square miles in just over one day. >> the ind is going every direction. like a tornado. kicking up really fast. >> reporter: in the burn zone firefighters struggle to stay ahead of the flames. pilots have been making drops here all day long, but the conditions are now blinding. it is really affecting the firefight here. last night they paused for a procession. a tribute for the three firefighters killed this week. we now know the fire made a 180 degree shift. a vehicle dropping off an embankment, tumbling downhill. richard wheeler, a ten-year veteran on the fire lines, leaves behind his wife. andrew zajac was married to a fellow firefighter. his grandfather says he loved the outdoors.ap>> oh, very proud. he was a -- he was a good boy. a real good boy. >> reporter: tom zbyszewski was just 20. the only child. the son of a firefighter. >> he was a special kid. you know. we're really going to miss tom. >> reporter: tonight they honor the dead by continuing the fight. for the first time in shington state history they're asking for volunteers who can operate heavy machinery. alex thomason spent thousands of dollars to buy a fire truck. now the full-time lawyer srepends his spare time protecting the community. >> if we can save one person's home, this is absolutely worth it. realere we soe. >> reporter: crews tell us tonight they are worried about the next six hours. that's when the red flag warning will end. if there is any good news here, it does promise better weather over the weekend. lester? >> miguel almaguer, thank you. hurricane danny has strengthened to a major category 3 storm in the atlantic. it's packing maximum sustained winds of 115 miles per hour. still about 900 miles away from the islands in the eastern caribbean. forecasts show it could weak-tone a tropical storm by the time it arrives there on monday. but it bears watching. tonight tens of thousands are expected to turn out for the biggest rally we've seen yet on the campaign trail. so many clamoring to hear donald trump speak in alabama they had to move the event to a football stadium that seats well over 30,000. nbc's katy tur is in mobile. >> reporter: august in mobile, alabama, where the mercury relentlessly rises to 90 and the mumdty is enough to make you melt in your shoes. >> trump for president. >> reporter: still the curious lined up for hours to see donald trump. some traveling hundreds of miles. others were bused here on eight trump-funded shuttles from town. the campaign initially booked a small mobile ballroom for tonight's rally but this week decided to move it to the lad people's stadium the site of the annual college senior bowl. capacity 40,000. so far 36,000 people have rsvped for tonight's event according to the campaign, and if they all show up it will be the biggest event so far this political season season. all fueled by donald trump's emotional appeals to conservative anger. hammering on points like border security, birthright citizenswip, andg linking immigraelon to crime. >> we will work with them. they hav to go. chuck, we either have a country or w don't have a country. >> minority voters are not a key electorate in the republican primary process. so for those republicans who fear that donald trump's rhe etoric isoo extreme or too alienating, i'm not sure it's going to hurt him within the primary. >> reporter: during the lunch rush at mobile's famous wencel's oyster house where the walls feature this sort of wry commentary -- "politics, the art of looking for trouble, finding it evulywhere, diagnosing it wrongly and applying unsuitable remedies." the perfect place to talk about trump. >> i'm looking for hamebodyrs to cut government down to size. government has been attacking the people and the people are tired of it. >> reporter: while not an early voting state, trump is here for a reason. it's the home town of jess sessions, the republican senator who helped him craft his immigration bill. alabama also passed the harshest immigration law back in 2011 before it wasv mostly struck down by the courts. lester? >> all right, katie, thanks. much m ie on all ings trump, clinton, and the race for the white house sunday morning on "meet the press" with chuck todd. confirmation tonight from the white house that the second min command of isis was lled in a u.s. airstrike last week. it happened while he was in a car driving near mosul, an isis stronghold in iraq. there's a desperateescene playing out overseas as hundreds of refugees are rushing the macedonian border from greece, clashing violentl with pouice. yesterday a state of emergency wasodeclad to handle the surge. our cameras were there when hundreds of refugees came ashore in greece just days ago. >> seof thousands who made the journey n recent weeks, most of th eem blame isis and the killing in syria. tensions between north and south korea may be at a breaking point this evening. and u.s. forces may be caught in the middle. north korea, a nuclear power and often prone to saber rattling, says it is mobilizing for war, claiming that south korea is provoking a ehowdoud. nbc's ian williams has our report from seoul, sotuth korea. >> reporter: north korea is threatening war over these loudspeakers. south korea recently started using them again to broadcast propaganda across the dmz. a provocation, north korea says. on state telision threats of military action unless the speakers are removed. e deadline now just hours away. kim jong un, the north's unpredictable dictator, today declared what he called a quasi-state of war and order his troops to prepare for battle. the demilitarized zone where north nd south korea face off is the most fortified place on earth. the south backed by 28,000 u.s. troops. u.s. forces have been there since the korean war. they take part in frequent military exercises with the somyh, including one under way no another provocation, the north says. the loudspeaker dispute triggered an exchange of artillery sifire thursday. the two koreas most serious clash in years. hundreds of border villages were forced to evacuate to underground shelters. >> this is one of the shelters. it's a p tty heavy bombproof door. this woman told me she was used to heated rhetoric but the shelling made her nervous. with good reason. >> north korea has nuclear weapons. the whole korean peevninsula's a tinder box. so we want to stabilize things. that's very much in our interests. >> reporter: but tonight south korea is saying it will strike back hard at any provocation from the north. ian williams, nbc news, seoul. a lot more to tell you about here. still ahead tonight, breaking the habit. how a family of five successfully did what so many people are finding impossible right now. cutting the gar. and later, a onfamily'of a different kind cooling off on a hot summer day. . >> there's bears in the pool. we live in a pick and choose world. choose, choose, ew choose. but at bedtime? 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we've heard a lot this summer about am?ricans trying to dramatically cut back on sugar, and just how hard it is to do. but tonight you're going to meet the one family of five that did it together. our national correspondent kate snow reports on their big challenge. >> reporter: for deirdre diggins dinner time used to mean a crazy mad rush to get me food in her teenagers. >> i'd be throwing food in my mouth and heading out. i was tired of the food preparation. and i think a lot of moms feel that way. >> reporter: but after her youngest was diagnosed with diabetes she reached out to nutritionist terry rhodes for help, starting with the pantry. >> i'd just take it out and say have as mu asyou want. >> reporter: first tip, get rid of those snack bins. >> this comes in at 27 grams of sugar. so within this amount they've now exceeded the daily recommended sugar intake. >> reporter: the american heart association says we should be eating between three and nine teaspoons of added sugar a day but the average american is eating 22. the sugar association says the evidence is lacking for these recommendations and that suge their moderation can be part of a balanced diet. >> for breakfast i would have i would say a handful of jelly beans. it was far more than a handful. >> reporter: naeemah clark didn't just quit sugar. like a growing number of americans she posted her goals on facebook. >> because i have said it out loud and my facebook friends knew and my friends at work were telling other people, like i know at i'm -- i can stick to this. and i feel good. i'm not grumpy about it. >> just look at how that difeerence in sugar is. >> reporter: in minnesota terry taught deirdre another tip. don't let your kids [c ctate the shopping list. fewer than three grams of sugar and greater than three grams of fibe is te y's general guideline. it was tough on deirdre's kids at first. >> we all were kind of like what? >> ice cream just went away? >> yeah. that was tough. that was really -- i miss that a lot. >> reporter: we had them document the first few days of the diet. >> c i'm tired. >> feeling kind of tired. >> overtired. i keep saying i'm tired all the time. >> reporter: but around day four everyone noticed a change. >> i feel good. >> reporter: my energy level was more -- i felt better all day. it's a work in progress but deirdre is hoping she can make the new habits stick. kate snow, nbc news, chanhassen, minnesota. we're back in a moment with warnings from the cdc. what you i called for help as soon as i saw her. i found her wandering miles from home. when the phone rang at 5am, i knew it was about mom. i see how hard it's been on her at work and i want to help. for the 5 million americans living with alzheimer's, and millions more who feel its effects. let's walk together to make an even bigger impact and end alzheimer's for good. find your walk near you at alz.org/walk. there's a more enjoyable way to get your fiber. try phillips' fiber good gummies plus energy support. it's a new fiber supplement that helps support regularity and includes b vitamins to help convert food to energy. mmmmm, these are good! nice work, phillips! the tasty side of fiber, from phillips'. i brought in some protein to get us moving. i'm new ensure active high protein. i help you recharge with nutritious energy and strength. i'll take that. yeeeeeah! new ensure active high protein. 16 grams of protein and 23 vitamins and minerals. ensure. take life in. morning ted! scott! ready to hit some balls? ooh! hey buddy, what' s up? this is what it can be like to have shingles. oh, man. a painful, blistering rash. if you had chickenpox, the shingles virus is already inside you. 1 in 3 people will get shingles in their lifeti .r ah. after almost 3 weeks, i just really wanted to give it a shot. you know, i' m not feeling it today. talk to your doctor or pharmacist about your risk. 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an incoming freshman at ball state university in muncie, indiana sinking a half-court shot to earn a free ride for the first half of the school year. believe it or not, the school says it's the second time in three years a student hit that shot to win tuition for a semester. and any kid playing in the street knows that when the ball gets away sometimes you've just got to let it go. that wasn't an option in toledo when a storm knocked a giant 250-pound red ball loose from an art installation and no gutter was big enough to stop it. it rolled over a car and if bent a street sign before it was chased down. when we come back, some pools are too hot. some pools are too cold. but this one, just right. with my moderate to severe ulcerative colitis, the possibility of a flare was almost always on my mind. thinking about what to avoid, where to go... and how to deal with my uc. to me, that was normal. until i talked to my doctor. she told me that humira helps people like me get uc under control and keep it under control when certain medications haven't worked well enough. humira can lower your ability to fight infections, including tuberculosis. serious, sometimes fatal infections and cancers, including lymphoma, have happened; as have blood, liver, and nervous system problems, serious allergic reactions, and new or worsening heart failure. before treatment, get tested for tb. tell your doctor if you've been to areas where certain fungal infections are common, and if you've had tb, hepatitis b, are prone to infections, or have flu-like symptoms or sores. don't start humira if you have an infection. raise your expectations. ask your gastroenterologist about humira. with humira, control is possible. feeling intense lower back pain? did you know it may be coming from being on your feet all day? dr. scholl's custom fit orthotic inserts are uniquely designed to provide immediate all day relief from lower back pain. ya know, viagra helps guys with erectile dysfunction get and keep an erection. talk to your doctor about viagra. ask your doctor if your heart is healthy enough for sex. do not take viagra if you take nitrates for chest pain; it may cause an unsafe drop in blood pressure. side effects include headache, flushing, upset stomach and abnormal vision. to avoid long-term injury, seek immediate medical help for an erection lasting more than four hours. stop taking viagra and call your doctor right away if you experience a sudden decrease or loss in vision or hearing. ask your doctor about viagra. we end tonight with what has to be the video of the day or i'd even say the year. it's a mom taking her kids for a dip in a back yard pool just like any other family, except you probably wouldn't want to play a game of marco polo with them. here's stephanie gosk. >> reporter: on a hot summer day when the woods in new jersey can really get unbearable, what's a mother of five supposed to do? >> there's bears in the pool! >> reporter: but the two children who normally get to use the pool aren't exactly happy about it. >> they took my floaty! >> i know, we'll buy a new one. >>ou reporter: and there are some practical concerns about a family of bears in the back yard pool. >> when the mother gets out, i'm afraid she's going to collapse the pool. >> reporter: the video posted by the basso family is irresistible, in part because the bears are so relatable. >> two are fighting. >> they're playing. they're brothers and sisters. >> reporter: some roughhousing, some take turns on the slide, going down and up the wrong way. look at this moment. a cup makes the age-old mistake of pestering mom when all she wants to do is relax. the penalty -- a roughly enforced pool time out. at some point it just gets to be too much for the bassos. the pool is a mess, the toys are chewed up. >> oh, that's not good. >> reporter: and the pool filter is ripped out. despite all the fun they are having -- >> the police are here. >> reporter: -- it's time for the bear family to go. >> maybe they're scared of the police. >> reporter: busted one too many times perhaps. >> oh, my goodness. >> reporter: stephanie gosk, nbc news, new york. >> i've got nothing else that can top that. that's going to do it for us on a friday night. i'm lester holt. for all of us at nbc news, thank you for watching. have a great weekend and good night. breaking sofia vergara wedding news. the invitations gone out and we've got all the details. >> now on "extra." sofia vergara and joe finally get married. when is it? where is it? >> are you one of those bridezillas. >> couples new scandal. new york's nba wife lala fighting accusations of cheating. >> the instagram attack we can't say on television. >> miranda lambert post-divorce make over. >> caitlyn jenner versus kris' ex. why caitlyn is slamming the former his. >> what you never knew about trump in military school to the family tragedy that may have forced trump to quit drinking. josh duggar and jared fogle are they sex addicts. three signs your man may be living a double life. >> whatever you hear is about 15% of what's really happened. >> plus naughty news anchor. patrick stewart outrageous new show, "blunt talk." >> i did get to find out what motivating is. >> now on "extra" from universal studios hollywood, the entertainment capital of l.a. welcome to "extra." i'm mario lopez. coming up, who is in the family trump. we break down all the people with their eyes being set on the first family. >> will josh duggar's wife stand byou her man. new details how she's coping. >> sofia vergara's wedding to joe manganiello is finally happening. the hottest couple in hollywood just three months from becoming hollywood's hottest mr. and mrs. joe and sofia making it officially official. the invitation is in the mail. >> i feel it will be a party. >> "extra" breaking all new i do details about fall's most anticipated celebrity wedding. we hear the two will tie the knot at the breakers in palm beach florida. the ceremony expected to take place on november 22nd at the five-star resort with 350 guests. >> how anxious are to you make sofia vergara mrs. joe manganiello? >> very. are you kidding me? >> sofia vergara telling howard stern her walk down the aisle

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