courtship ritual. since it is unusual for tigers to mate in captivity and there are fewer than 500 of these tigers left in the wild.

kellye: looking for the mother's day forecast. devon: humidity picks up a little bit but kind of the counter action. into the 70's and a little more humid. with the clouds, we are watching but just rain chances holding off until after nan. not a bad forecast. better chances of storms as we'll see ana and then a front coming together and con vernacularring to bring it more into monday. kellye: all right. thank you, devon. we ask you to stay with us.

announcer: now abc 7's saturday news extra on your side.

kellye: another tense night in the plains for more than 30 million people across six states. the national weather service is issuing severe weather watches and the tornado season is ramping up. we'll go to storm watch in oklahoma city. reporter: severe storms ripping across the plains. >> wow! reporter: tornadoes once again touching down in texas killing one in sysco and causing what authorities call a considerable amount of damage. the rain there is still heavy. assessing damage is too difficult. oklahoma also taking a beating from large hail and flash floods with more than 4 inches of rain falling in just the last 24 hours. mother nature unleashing her fury four days and counting, dumping snow in nebraska, colorado and california leambing behind downed trees and crushed cars. >> we have a large multiple

vortex tornado on the ground here south of lifpblg. reporter: since tuesday more than 70 twisters. and now more families in the storm's path are investing in storm shelters for protection from the wicked weather wreaking havoc. >> getting stronger. reporter: where we are it was another day of full of showers and thunderstorms with more threats of severe weather on tap for tomorrow. elizabeth hur, abc news, oklahoma. kellye: getting towed has become almost a rite of passage in the d.c. area. while maryland law banned a predatory practice many of you have complained about spotters are still perfectly legal in virginia. an i-team investigator went undercover to see it action. reporter: two ladies park their car and head out for lunch. as they walk away our camera is watching but we're not the only ones. see this guy? we watched him park in this arlington shopping center for hours but he's not just hanging

out. it appears he's working with this man, a driver for advanced towing. and when these ladies step out of the shopping center right in front of him the truck rolls in and their car is gone in 60 seconds. >> i know this is happening over and over again. reporter: charlie says it happened to him, too. he parked in this same shopping center and missed this sign as he walked to the thai restaurant next door. he spotted this warning on the door and in the time it ask the owner where he could park and walk back his car was towed. >> three minutes. five minutes. totally not acceptable. it's shocking. reporter: advanced towing calls it trespassing saying it is paid to tell people to post private spaces in private lots when they're actual i going somewhere else. >> this seems to be something the state ought to look into. reporter: we've been looking too watching advanced towing's lot since december. two weeks ago when we asked the company to talk about its legal use of spotters they sent a

statement alaud tog a video involving a former abc 7 employee. >> okay. careful. reporter: hours later this clip went viral. we didn't even know she had been towed until they told us. our investigation began months before her case because we heard plenty of other complaints. in the last two years, 75% of the towing complaints filed with arlington county police were against advanced towing. >> pretty outrageous. reporter: we showed this delegate how it works, watching this woman in a different arlington lot. the spotter follows her as she steps away. less than two minutes later there is the tow truck. 90 seconds later her car is out of there. >> whether it's legal or not it clearly doesn't seem to be the right thing to do. reporter: advanced towing wouldn't talk on camera or confirm its legal use of spotters but told us by e-mail certain infractions can't be enforced without witnesses. advanced says enforcing private

parking violations when they occur is a more certain, practical approach. >> there really should not be that sort of a time for anybody to be penalized. what these folks are doing isng advantage of that. and tricking the reasonableness down to five seconds or 30 seconds. kellye: advanced towing received nine violations from arlington county police in the last two years. more than any other company. the company says complaints represent a tiny fraction of its total tows. in an e-mail advanced says it towed violators because the properties it worked for wants spaces available but in every lot we watched there were plenty of open spots. we should note that advanced towing also handles towing for the lots here at abc 7. in friendship heights new meters could make shopping more convenient and safe. montgomery county reporter kevin lewis explains why. reporter: friendship heights is getting more technical and costly. this month crews will install 100 meters along parts of wisconsin and willard avenue plus friendship boulevard.

>> that extra buffer. reporter: ken hutton is the liaison between the county and the citizens and says the meters will promote business and deter crime. in 2013 thieves hit this store and in 60 seconds smashed a glass case and snagged $150,000 in fine watches. their getaway car? parked right outside cartier's front door on wisconsin avenue. >> that extra parking takes away the opportunity. if someone is looking for pulling up to the curb and put on the flashers and commit a crime it doesn't occur anymore. reporter: david churchill lives in this condo building and says pay as you go parking could jeopardize his social life. >> if i have a guest coming to visit me there are very limited options and with this situation it will be even more limited. >> people won't abuse the parking spot because they have

to pay for it. they won't just park the car and walk away for the whole day. kellye: coming up on saturday news extra the fight over closed captioning. how it all centers around a super hero and the local fan who is taking center stage. devon: first about your mother's day forecast and then we'll start to track at least the effects of ana. what we do with the cold front counteracting it as well. our complete forecast just minutes

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kellye: closed captioning is fairly commonplace these days but what is far less common is help for the visually impaired. a marymount university student decided to change that. northern virginia bureau chief jeff goldberg explains how he did it. reporter: if you're impressed by the rich description and detail you'll want to hear the story. >> i just felt like i could help people. reporter: he is a freshman at marymount university in arlington and could not wait for last month's premiere of the netflix series "daredevil" but after watching found out netflix did not provide aid for the visually impaired for the show which is about a blind super hero. >> you look in the dictionary under the definition of irony and that's right there. reporter: he connected with a group on facebook working on a fix and created a petition of his own. after quickly gathering more

than 3600 signatures he got more help from change.org. with speed and efficiency that would impress even the avengers the collective work caused netflix to add the new audio setting to daredevil along with 49 other shows. >> you know, i didn't think my petition would go anywhere. reporter: many people we spoke with here were not familiar with the technology let alone had used it at all so we wanted to ask what do you think? we asked mary macarone and caroline benz to close their eyes and listen. >> i think it was more than i expected. >> it was pretty descriptive, like you could see it in your head. pretty cool. reporter: ryan thinks so, too. the thought of more change -- >> slowly but surely everyone is going to start catching on. reporter: -- is music to his ears. kellye: an add on saturday news extra. it's an extra science lesson just once a month but we'll

tell you what it is about the newly formed chemistry club that's making such an impact. devon is back with your mother's day forecast.

kellye: some people might be wondering will the sun come out for mother's day tomorrow? devon: eventually. could be a lot like saturday with the cloud cover around the morning time frame areas that had some fog. more expected. however with higher humidity might work in our favor. look at the high temperatures.

83 washington. for the fourth day in a row just west of here charleston, west virginia 90 degrees. four in a row. in may. early may at that. we have the tracking of the humidity. clear skies as we continue to go overnight. you have light winds and temperatures go down closer to the dew point temperatures. even get some fog to form, cloud cover around in the morning. i'll leave it to you whether the balance will be temperatures 70's, humidity higher, if the hirer temperatures would be on the higher humidity it wouldn't feel great. obviously the warmer weather still west, 90 degrees that had been in charleston something to keep in mind. severe weather today but could have been worse to the midwest. the atmosphere reconfigured and left over cloud cover and cooler temperatures in spots. looking south this is ana just south of our region. the first tropical like system in a year. near 70-mile-per-hour wind gusts. pretty impress ive for the first named storm.

by monday, monday afternoon this system is going pretty close to the region. effectively it just enhances our moisture field with a little more water vapor and we feel the humidity into the air. that increases the chance of showers and storms and also the system west that i just showed comes in as well. accommodations likely chances of rain more to monday. ana here slow churn. still moving and still pretty far south. sunday and monday, monday the likeliest storm day. from this vantage point it's a long -- you see a lot of storm activity. just humidity working in. we'll get to the storms in a minute and a closer view. tomorrow morning mild but a little humid. could see the fog forming. some cloud cover around, only 60's. note the humidity levels going up. cloud cover morning. hesitate to really say warm. at least humid. slight chance of a storm and a very isolated nature in the afternoon. it leaves cloud cover. get out for an outdoor activity with mom tomorrow, can do it before the storm chance which

is very slim. lower to mid 80's coming back. warm, humid. here you go. sparking numerous scattered showers and storms coming into monday. yes it's going to be humid. thunderstorms coming in likely and the high temperature forecast. could be mid 80's even in some locations if we get enough sunshine. looks to be a likely forecast for us. so moms day tomorrow just cloud cover. a little more humid morning time frame. slight chance of a shower. storm holds off until afternoon. outdoor plans okay. monday we should have scattered storms. could be 90. tuesday, temperatures take a big plunge. lower 70's. kellye: am i the only one that doesn't mind the 90-degree temperatures? devon: if it's dry enough. kellye: that's key. low humidity. thank you, devon. students at a maryland elementary school are giving up their recess to learn science. the chemistry club is held only once a month but is already having an impact. that makes the program this week's harris's hero. >> so what you are going to be

doing today is testing whether certain solutions or acids are -- >> at dayton elementary school these budding young chemists are getting instructions for the next experiment involving red cabbage and household products. >> take this and dip it into different solutions. reporter: this is not your average fourth grade science class. patricia is a college chemistry professor and volunteer science coach with the american chemical society. she comes to the school once a month. >> this is a fun way to get the kids involved, showing them that science is not just a book but it's real. science is something you touch. reporter: and the students really like the hands on aspect. >> sometimes you fly and stuff. >> chemistry has a lot of things and cooking is one of them. i really like cooking. >> i think it's worth it. i learn amazing things here. >> you don't have to worry

about everything being right or the experiment going right even if you mess it up. reporter: for one student it is also very personal. >> i like it when she can take on other people. reporter: that's because the science coach is also her mother. as for the program's impact on the students --. >> they are talking about chemistry, telling me knowledge about the periodic table that i wouldn't expect an average fourth grader to know. >> all it takes is one person to spark an idea. reporter: leon harris, abc 7 news. >> not only do the students benefit. the schools that have a science coach get $500 from the american chemical society. there are 200 science coaches nationwide with 11 in our area. coming up on saturday news extra, one of the most famous named in flight is getting a makeover. a look inside the new and

kellye: one of the two planes that serve as airforce one just returned from an 18-month overhaul. mary bruce gives us a rare look inside. reporter: it's one of the most famous symbols of the power of the american presidency. and perhaps the best presidential perk. airforce one. a fully functioning, secure white house in the sky. abc news got an exclusive nose-to-tail tour from the airborne oval office and situation room to the operating table and even the bathroom. the presidential aircraft like you've never seen it before. >> this is really a no fail

mission up here. this is not a practice job but a super bowl every day that we fly. reporter: right now over two dozen crew members are preparing for president obama's 1,070th flight. overall the president has logged more than a million miles on airforce one the equivalent of 98 days on the plane. talk about being a frequent flyer. and forget the peanuts. this crew can serve up to 100 gourmet meals at once on presidential china no less. >> we serve the president, his staff, and the crew. we have a cook to handle all the hot food. reporter: the two identical boeing 747's are kept in tip top shape. just good old fashioned elbow grease. security is robust and top-secret. despite what you may see in movies like "airforce one." >> get off my plane. >> totally realistic, right? >> absolutely -- not. [laughter] reporter: the technology may be

state-of-the-art but this aircraft is all 25 years old. but it still has a perfect record. never a security breach and never a delay. mary bruce, abc news, andrews air force base. kellye: the other 747 known as airforce one is off to texas for the same 18-month overhaul. it will likely be the last major work on the 25-year-old planes. when we come back devon has