Dangerous heat claimed the life of a third Philadelphia resident in two days on Sunday, officials said.

A 59-year-old North Philadelphia man died on Sunday of heat-related complications, officials said. The man also suffered from diabetes and congestive heart failure, they said.

The man marks the third heat-related death in the city in two days, after the current heat wave took hold, sending heat indexes soaring into the 100s, on Wednesday. Two women died of heat-related issues on Saturday, authorities said.

One of Saturday's heat fatalities was a 67-year-old Port Richmond woman who also suffered diabetes and congestive heart failure, officials said. The other was an 82-year-old North Philadelphia woman who suffered from heart disease and high cholesterol.

NBC10's First Alert Weather team predicts the heat wave will last until at least Thursday, with temperatures projected to stay in the 90s most of the week.

The man's death Sunday brings the total of heat-related deaths in the city to seven for the year.

The Philadelphia Corporation for Aging Heatline has been extended through Tuesday, August 17 due to the ongoing heat wave. The Heatline will be open until midnight tonight, from 8:30 a.m. to midnight Monday and from 8:30 a.m. to 6 p.m. Tuesday.

The heatline can be reached at 215-765-9040. Click here for tips on staying cool during dangerous heat.

A teen boy was shot and killed in the Kensington section of Philadelphia Sunday afternoon.

The 16-year-old was inside a black 2001 Chrysler on 2000 E. Orleans Street at 1:58 p.m. when an unidentified gunman opened fire. The teen was struck once in the back. He was taken to Temple University Hospital where he was pronounced dead at 2:24 p.m.

No arrests have been made and a weapon has not been recovered.

This story is developing. Check back for updates.

A man and woman were killed following a multi-vehicle crash in Philadelphia.

A 23-year-old man was driving a Volvo at a high speed on Lincoln Drive and Gypsy Lane at 1:56 p.m. Sunday, police said. The Volvo then jumped a median strip and was struck by a black Infinity, according to officials. The impact pushed the Volvo back over the median strip and the vehicle was then struck by a silver Kia.

The 23-year-old man was pronounced dead at the scene at 2 p.m. The driver of the Kia, a 55-year-old woman, was taken to the hospital where she was pronounced dead at 3:39 p.m. The driver of the black Infinity was not injured in the accident.

Two children are in the hospital after a pickup truck crashed into their ATV in Berlin, New Jersey Sunday.

The boys, ages 9 and 11, both from Magnolia, NJ, were riding on an ATV and crossing the roadway on the 200 block of North Grove Street around 3:20 p.m. when they were struck by a pickup truck.

The two boys suffered several injuries and were flown via helicopter to Cooper University Hospital. They are both in serious condition. The driver of the pickup truck, a 57-year-old man from Sicklerville, NJ, was not injured in the crash and remained at the scene.

Officials continue to investigate the cause of the accident.

Two women are in custody after they allegedly left a baby alone inside a vehicle for nearly 15 minutes in the parking lot of a Bensalem Target store during dangerously hot temperatures Sunday afternoon.

Police were called to the parking lot of the Target store on Rockhill Drive around 3:55 p.m. for a report of an infant left in a car. When they arrived they found an off-duty Philadelphia Police officer who was already opening up the vehicle to rescue the child, who is turning 1-year-old next week.

Officials say the child was alone inside the car for 14 minutes and the recorded temperature inside the vehicle was 115.4 degrees at the time. The child’s mother was called to the scene and she accompanied her baby to St. Mary’s Medical Center for an evaluation. Officials say the child appeared to be in good condition.

The baby’s grandmother, Patricia Diaz, and the baby’s aunt, Katia Hernandez, were both arrested and taken into custody. The women allegedly told police they forgot the child was in the backseat when they left the car. Both women are charged with one count of endangering the welfare of a child and are being held in Bucks County Jail after being unable to post bail. Their arraignment is scheduled for August 24 at 1 p.m.

SUMMER DIDN’T START VERY HOT, BUT….
By the 4th of July, summer 2016 hadn’t been very hot. The hottest day of the entire summer up to that point was a mere 92 degrees. And it wasn’t even humid. There wasn’t a single heat wave in June. The single heat wave in May was the absolute minimum: 3 straight days of exactly 90 degrees. And the warmest night up to July 4th got down to 72 degrees-an indication of just how NOT humid it had been.

Then came July 6th. More than half the days since then have been 90 degrees or above in Philadelphia! We’ve had four heat waves since then, and the humidity seems that it’s gotten higher in each one. The current heat wave, although the temperature hasn’t gotten above 98, has become deadly. And there’s more of the heat wave to come.

THE HEAT INDEX (OR “FEELS LIKE” TEMPERATURE)
We’ve all heard “It’s not the heat-it’s the humidity”. But that’s not true. It is clearly both. And there is a single number that measures the impact. Believe it or not, it was first developed by a TV meteorologist (George Winterling in 1978), who called it "humiture." I actually prefer that term, since it perfectly combines humidity and temperature. Pretty clever, George.

The National Weather Service picked up the good idea and called it the Heat Index. Some refer to it as the “Feels-like Temperature”, which can also be used in winter instead of the Wind Chill. Viewers sometimes ask me for the “formula” for calculating these terms. I always tell them: “You really don’t want to know”, and show the formula that proves it:
   HI = -42.379 + 2.04901523T + 10.14333127R - 0.22475541TR - 6.83783x10-3T2- 5.481717x10-2R2 + 1.22874x10-3T2R + 8.5282x10-4TR2 - 1.99x10-6T2R2

See, you really don’t want to know. Fortunately, quick calculations can be made using sites like this or you can look at a simple table once you know the temperature and relative humidity:

Anything in the orange area is considered the “danger zone” (about 105 or higher). That’s when we see reports of heat exhaustion or heat stroke. I’ve seen Heat Index readings as high as 122 in our area. The highest I’ve ever heard about was an amazing 172 degrees F in Dhahran, Saudi Arabia.

Heat can be a killer. In July 1993, 118 people died from heat-related causes in Philadelphia. That’s the highest death toll from any weather event in our recorded history. So we take extreme heat seriously.

HOW HOT DID IT GET
On Saturday, the 13th, the heat index got up to about 112 in Philadelphia. The highest reading in our area was 122 degrees in Dover, DE. But the dewpoint reading there has seemed to be too high compared to nearby sites, so that may be a bit of a stretch.

Other top Heat Index readings were:
    113 in Millville, NJ
    112 at Atlantic City Airport
    110 in Wilmington, DE
    109 in Trenton, NJ
    108 in Allentown, PA
    107 in Reading, PA

HOW MUCH MORE OF THIS IS COMING?
We’re predicting highs of 95 both Monday and Tuesday. The dewpoints and relative humidity (either can be used for the calculations) won’t be quite as high as they were Saturday, so the Heat Index will be up to about 103. The problem is that the accumulation of heat is a key factor in heat-related deaths. Those brick row houses in parts of Philadelphia act like ovens without air conditioning. Fans just blow the heat around. Some people have air conditioning, but don’t turn it on because they feel they can’t afford it. When you combine that with elderly people with existing heart problems, the threat goes up even more.

Because of the above reasons, we ask that you check on the elderly during the rest of this heat wave, especially if they don’t use air conditioning. And make sure they get a break in a cool area-and with plenty of water. Of course, don’t forget about pets-they are wearing fur coats, and don’t have the luxury of turning on the AC themselves. And, of course, never leave a child in a hot car. Temperatures climb rapidly in an enclosed car on a sunny day.

After Tuesday, temperatures should drop off a bit (closer to 90 than 95), and the humidity will drop a bit. By next weekend, we could actually have highs in the 80s.

This has not been the hottest summer on record. The official temperature still hasn’t reached 100. There’s still plenty of summer to go. So far, we’ve had 30 days reaching 90+. The average for the whole summer is only 21.

SEPTA Regional Rail commuters will see more changes to train schedules beginning Monday, as the transit authority works to enhance service after structural defects sidelined a third of its fleet.

Beginning Monday, Aug. 15, SEPTA will add an afternoon train to the Lansdale/Doylestown Line. Train #6586 will depart Suburban Station at 4:10 p.m. and run to Glenside. A morning train will also be added to the line: Train #6505 will depart Penllyn Station at 6:23 a.m. and run to North Broad.

Several adjustments will also be made to train schedules on the Lansdale-Doylestown Line, with several trains departing and arriving at different times. Train departure times will also change on the West Trenton, Media/Elwyn and Warminster lines. For a full list of arrival and departure changes, click here.

A Pennsylvania mother shot to death by her husband, who also killed the couple's three young children, told police in the weeks before her death that she feared her husband, authorities said Monday.

Megan Short, 33, called police to her family's Sinking Spring, Berks County home July 18 — just shy of three weeks before the murder-suicide — after she had a dispute with her husband, Mark, Berks County District Attorney John Adams said Monday. Adams said officers advised her that she could file a protection-from-abuse order — something she told them she planned to do, but never did, he added.

Megan Short told responding officers that day that she feared her husband would harm her.

She had reason to: The next day, Adams said, Mark Short went to a gun shop in Lancaster County and purchased a .38-caliber handgun and bullets. He would later use that gun, Adams said, to shoot his wife and three children — 2-year-old Willow, 5-year-old Mark Jr. and 8-year-old Liana — and the family's dog to death before turning the gun and killing himself with a single gunshot wound to the head.

Mark Short, who had lost his job as a loan officer not long before the murder-suicide, hand-wrote a note after he killed his wife and children, before killing himself, investigators said. They would not reveal what the note said, but said that it did not show any remorse or reasoning for the killings. Each child, Adams said, died of a single gunshot wound, and investigators found six spent .38-caliber shell casings in the home.

Megan Short had posted on Facebook in the months leading up to the murder-suicide that her husband was abusive and that she planned to leave, friends said after the killings. Authorities said she rented an apartment in Yardley, Bucks County July 25 and planned to move there the day of her and her children's deaths. She posted on Facebook asking for help moving the day before, Adams said, though Mark Short also allegedly planned to help his wife move.

Mark Short took the three children to Hersheypark the day before the killings, Adams said.

Police found the bodies of the 40-year-old father, his wife, the three children and the dog Saturday, Aug. 6 after Megan Short's mother called them concerned when her daughter never showed up for a lunch they planned. The mother told police then that her daughter and son-in-law had been having problems in their marriage.

When police arrived at the home, there was no answer, so they had to force their way in through a kitchen window, Adams said. They found the bodies in the living room, the children still dressed in their pajamas.

Authorities said they don't know why the Shorts' marriage disintegrated, but small insights into their lives came from posts by Megan Short on Facebook alleging abuse by her husband and detailing her plans to leave the marriage, as well as from Mark Short's relatives, who spoke with NBC10 last week.

Mark Short's aunt said Megan was young when they began dating and eventually married. Mark was seven years her senior.

The couple struggled with Willow's, the youngest child, illness — a severe congenital heart defect that required her to have a heart transplant when she was just days old.

In April, Megan Short wrote about the post-traumatic stress she continued to suffer as a result of Willow's sickness on a blog, Philly at Heart. News stories in the New York Times and the Reading Eagle detailed the family's difficulties obtaining medication the little girl needed to survive and grappling with the after effects of her heart transplant.

Hundreds of people attended funerals for Megan Short and the children held in Northeast Philadelphia late last week.

Megan Short's family has not spoken out about her death, but Mark Short's relatives in Folcroft, Delaware County, described him as a family man.

"You wouldn't think he would do this kind of thing," Mark Short's cousin, James Short, said. "But in the situation he's in right now, you never can tell with people."

Nia Ali's first heat is August 16 at 10:05 a.m.

Philly’s own, Nia Ali, has overcome hurdles both on and off the track to become one of the top 100 meter hurdlers in the world. Ali was an all-around high school athlete in Philadelphia and Pleasantville, N.J. before committing to Track & Field.

In 2009, while Ali was running for the University of Southern California, her life was rocked by news that her father died in a murder-suicide back home in Philadelphia. After taking a year off, Ali came back to earn a championship title. This summer, she's representing Team USA in the Rio Olympics. It'll be a family affair for Ali who has a 2-year-old son with Michael Tinsley, who took silver in the 2012 London Olympics in the 400M hurdles. He's back for a second run in Rio. Their son, Titus, will cheer from the stands. We caught up with 27-year-old Nia a couple days after she qualified for the Olympics as she traveled from Oregon to Los Angeles.

Q: Nia, has it sunk in yet that you’re actually going to Rio?

I keep telling people maybe when I get back to LA. It hasn’t really sunk in completely because I keep talking to new people and people who helped me in my career. It is always a new feeling talking to each person and I haven’t gotten a chance to take it all in. I am still grinding for the gold. So it’s hard to kind of relish in the moment because you’re always on the go and there’s always something coming up. I’m still in shock.

Q: Elite athletes like yourself, we know you're physically capable, but at this level, so much of it is mental. What got you over that finish line during the Olympic trials?

That was the first time I really thought about how many people were watching and that kind of made me nervous but also made me really want to do it. And I never know until I cross the line and look at my phone and see so much love and support from people and I’m like, "Wait you were watching?" There were people from middle school and teachers watching. So it made me really want to do it. And I went out there. I prayed to God and said "I know a lot of people want you to be with them right now but I need you." So, my faith is strong and I believe that I was one of the chosen ones.

Q: You have a huge family back in Philly and you often talk about the emotional boost you get from them. What was your family's reaction after the Olympic trials?

I mean everyone just kind of had the vision. My family believes in me and they are incredibly supportive. They all wanted to come to Rio and it’s been Road to Rio for over a year now. Since I got pregnant it has been Road to Rio so they have been saving up and preparing for this moment. They knew it was going to come at some point.

Q: What fuels you? Do you have special diet regimen?

I drink a lot of water. I’m not a big juice drinker but I do drink a lot of water. Non-stop. I had a lot of injuries in the past like hamstring pulls so I like to make sure a lot of fluids, electrolytes, probiotics, and fruits are in my body. I am constantly snacking, but in the past I’ve always been injured and this is the first year I’ve been completely healthy. When I used to try to go for more in training is when I usually would get hurt, so I’ve worked on listening to my body a lot more.

Q: Nia, a lot of athletes have quirks or rituals before or during competition. Do you have any superstitions?

I'm not really superstitious but I do have rituals. I don’t eat on race days regardless of when I have to compete. I could compete at 8 p.m. and I won’t eat all day. I like to put two pins in my number because I don’t really like to use four. There are a lot of things I like to keep the same because I believe that can lead to the same or better results.

Q: You've got a 2-year-old, you're training for the race of your life in Rio and so is Michael Tinsley. You were on the West Coast, he was in Texas -- with such demanding schedules, how do you two stay connected on the family front?

We're always in contact and I think the fact that we’re in the same sport and on the same level really helps. We understand the lifestyle and are always interested in how each other’s training is going. His coach is very supportive of me and vice versa. We’re a part of each other’s success and we do really well together. So if he wants to talk track then he will talk to me and I will keep him calm and I’ll talk to him. He does the same for me. So we just balance each other and don't allow outside pressures to get to us.

Q: What you've achieved on the track after having a baby is astounding. How did you come back so strong after Titus was born?

I was so motivated and I was extremely blessed with the pregnancy. I didn’t really gain any weight, it was all baby. I was able to train for four to five months into my pregnancy and even when I didn’t train I still stayed really fit. So, it never really felt like I lost a beat. After, I got back into it I felt really good and things that I thought I lost my coach Ryan Wilson was really supportive. He told me, "You’re stronger than you’ve been and your training is going better than it ever has and you’re faster -- so don’t believe what your body is trying to tell you." He kept reinforcing that I was ready and I believe in him and everything that he tells me.

Q: You basically grew up on the track, starting club track when you were 6 years old. How did your Amateur Athletic Union (AAU) experience shape you?

That is my entire family and your whole support team comes from AAU track. I feel like it gives you a good ground to stand on. Sometimes you have to travel and get tested in the rain and I’m 11 years old doing these things. So you are going through so much with these people. You are growing with these people and it really builds character.

Q: After losing your dad, what advice do you have for people going through really hard times?

You should always look to the people closest to you for support during those times. After I went through what I went through with my dad, I just wanted to be with my grandma, family and friends. And I gained a sense of what really matters. You realize everything is going to come to an end at some point. When we're here doing track, this is really a short part of our lives. It doesn’t define you and it doesn’t make you who you are. But you can help build a legacy and I think it’s important -- for people to take advantage of moments.

So I don’t look too far in the future or dwell too much in the past. Things will always fall into place the way they are supposed to fall into place.

Q: What does @ItsPooda "Oprah’s Only Child" Twitter name mean?

[Laughing] It’s just a nickname. My first college suite mate played basketball and she would always say, "It's Pooda!" every time she saw me. Or when she left me messages on my white board it would say Pooda. "Oprah’s only child" is just silly. Oprah doesn’t have any children and I love what she stands for. I am very into finance and building a brand and building a legacy for the people behind you. Her charity and everything that she does, I just love her. so I’m proud to say I’m her only child.

You might say running is in Nia Ali’s blood. We caught up with the 100m hurdler's mom, Melita Johnson, on her way to Rio with Ali's little boy, Titus. Johnson says she always knew her daughter would be an Olympian. Ali’s unwavering determination that led her to Rio. 

Q: Melita, where does Nia get her drive and motivation?

It’s passion for whatever she does. Nia dances too and I used to be a dance teacher. She used to get up out of her seat and just dance. So, whatever she does she goes 100 percent.

Q: A big part of Nia’s track experience was her Amateur Athletic Union (AAU) team in Philadelphia. Are you still helping coach the Mallery Challengers?

I also ran there years ago, so a few yeas after Nia started running, the coach asked me if I wanted to coach. I had already been volunteering and so then I began coaching. Both my daughters ran track and I just stuck around to help where I could.

Q: You’ve watched Nia run since she was 6 years old, so how does it feel to be on your way to watch her in the Olympics?

Being out there in trials was initially scary. I had a lot of anxiety because I know how much she wanted this and I know how hard she worked. From the time she was six years old she would do whatever Coach Daryl Murphy told her to do. She really puts trust in her coaches, so I wanted her to make the team for herself because she works so hard. So when I saw her name on the Olympic trials, I just broke down. It was an amazing feeling.

Q: Nia was sidetracked after losing her dad in a murder-suicide in 2009, while she was running for the University of Southern California. But she came back a stronger, more determined athlete. How?

Her being away at college I didn’t know what her struggle was and she would talk but I couldn’t tell where she was with that entire situation. She is very spiritual and finding God and talking to doctors while she was at school helped her finally worked through it. No one will understand why that happened but we have to keep living and moving forward. We go through those times where I’m sure she wishes he was here and she will say this is for her dad, or my dad. When we lost my dad -- and he was an avid track runner -- it was hard. So we are a track family and she runs for them.

Q: Most people probably don’t know that Nia had a son, Titus. Has he taken any interest in the sport?

He’s 15 months and very active. Titus was here [in Philadelphia] with me for most of the summer and he comes to the track with me. I coach long jump and he will try to do the drills with the runners. 

Q: Nia said you always knew she would someday make it to the Olympics. A mother's intuition?

When Nia says she's going to do something, she does it. She said, "I’m going to be bi-coastal in Philly and in LA." Then she became bi-coastal in Philly and LA. When she said she wanted a car she said, "I’m going to get a Range Rover," and then she got a car. When she said she wanted to be an Olympian I believed it. I just knew it.

Q: What else you would like people to know about Nia?

Other parents came up to me after the trails, thanking me because they thought my daughter was such an inspiration. Then Nia actually took the time out to talk to that woman’s daughter. That’s just who she is. She’s always been the type to hang out with anyone or if someone needs help she will take the time out to be there.

Watch Nia’s first heat on August 16 at 10:05 a.m.

A crash in Philadelphia's West Oak Lane neighborhood left one person dead, two others injured and a driver behind bars Monday morning.

Police said the crash happened about 4:25 a.m., when a 22-year-old man in a sedan ran a red light at 18th Street and 66th Avenue, crashing into a van with three people traveling inside it and overturning the van.

A 47-year-old woman in the van died at the scene, police said. Two other people in the van, a 62-year-old man and a 20-year-old man, both went to Albert Einstein Medical Center to be treated for minor injuries.

The young man driving the striking vehicle was not injured, police said, and officers arrested him for running the light and causing the crash. No charges were announced late Monday morning, but police said the man had not been driving under the influence. 

A trash truck took out two power line poles in northern Delaware, causing power outages for more than 1,000 people in New Castle County.

NBC10's Tim Furlong reports the truck hit power lines on Sharpley Road in Wilmington, taking down the wires.

Delmarva Power says the outage affected about 1,300 customers, who were without power -- and air conditioning -- in the Wilmington, Newark and Middletown area. The lights and air conditioning came back on for most people before noon -- well ahead of estimated restoration times that placed it in late afternoon. Delmarva's website said about 200 households in New Castle remained without power about noon.

Hyatt, Sheraton, Marriott and Westin hotels in 10 states and the District of Columbia may have been targeted by hackers for months. 

According to the hotel operator HEI Hotels & Resorts, malware put into place in at least 20 locations may have collected names, card account numbers, card expiration dates and verification codes. 

Data from customers may have been collected from early December, through late June. At some properties, HEI said, data collection may have begun as early as March 2015 at hotel locations where people bought food or drinks. 

HEI said in a company release that "We are treating this matter as a top priority, and took steps to address and contain this incident promptly after it was discovered." 

HEI said that once it found out about the problem it transitioned payment card processing to a stand-alone system that's completely separate from the rest of its network. It disabled the malware and is in the process of reconfiguring various components of its network and payment systems to make them more secure. 

The company said it's continuing to cooperate with the law enforcement investigation and coordinating with banks and payment card companies. 

Anyone who used a card at HEI hotels in the given time frame should review their account statements and look for discrepancies or unusual activity, both over the past several months and going forward, the company said. Customers who notice anything out of place should contact their credit or debit card issuer.

Starwood's Westin hotels in Minneapolis; Pasadena, California; Philadelphia; Snowmass, Colorado; Washington, D.C.; and Fort Lauderdale, Florida, were affected. Also breached were Starwood properties in Arlington, Virginia; Manchester Village, Vermont; San Francisco; Miami; and Nashville, Tennessee.

Customers may also visit www.heihotels.com/notice for additional information about the incident. 

The company says the breach has been contained and customers can safely use cards at all of its properties.