Heat index could reach as high as 115 degrees

ABC News' Meteorologist Kaylee Hartung joins ABC News and tracks the heat alert in 34 states as temperatures reach all-time highs.
3:23 | 07/20/19

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Transcript for Heat index could reach as high as 115 degrees
First though, we start with that dangerous heat across much of the country. Look at the map. Heat alerts in 29 states from New Mexico to Maine. This really is a dangerous situation. At least one person has already died. And we have these images from the sweltering subway platforms here in New York City. This intense heat is putting a train on the city's power grid. We begin with Kaylee Hartung who is inside con Ed's emergency response center. Good morning. Reporter: Good morning, whit. Officials from con Edison telling me this morning they are very confident New York's power grid can handle the stress. While the forecast has been preparing people across the country all week long for these conditions, power companies have been preparing all year. This morning, more than half the country is on alert for dangerous heat. New York, one of 29 states with soaring temperatures. Overnight, thousands of subway commuters were forced to wait in sweltering underground stations for hours after a network communications issue brought service to a halt. This strain coming just one week after a blackout affected Manhattan. Con Edison dedicating 4,000 crew members to responding to any issues that might arise. We expect demands this weekend to rival all-time weekend peaks. Reporter: In Baltimore as the heat index reached triple digits, thousands were without power while crews worked to get the lights back on, the loss of electricity under investigation. In Chicago, firefighters were called to rescue a 6-month-old baby who was trapped in a hot car for at least ten minutes. Temperatures reaching 112 degrees, the baby expected to be okay. In Arkansas, former NFL lineman and super bowl champion Mitch Petrus died of an apparent heat stroke Thursday night after working outside in brutal conditions all day. As temperatures broke 100 in Kansas and Iowa, roads buckling. In Wisconsin, first responders battled two massive fires, enduring 90-degree heat before getting the flames under control. The combination of heat plus humidity could make it feel 5 to 10 degrees hotter, even harder on our bodies. Airlines taking extra measures for outside employees, providing cooling stations and cooling neck bands. Hospitals on heightened alert. What are your concerns in these extreme temperatures? The body's normal mechanisms which usually regulate temperature fail to work. This can lead to multiple problems, inflammation, cell death and eventually organ failure. Reporter: Here in con Edison's emergency response center, they're monitoring the usage of the more than 9 million customers they serve. You can see on the screen behind me, the highest usage in Brooklyn and queens. That is to be expected on a weekend. Dan, officials tell me they're glad this isn't hitting on a Tuesday because that would mean higher usage in Manhattan when you think about all of those office buildings, the air conditioners and the elevators they would use. Speaking for me and Eva, we're glad that the power seems to be working because we lived through a blackout last weekend. Kaylee, thank you very much. We also want to acknowledge this is your first time on our show so we would like to welcome you to the "Good morning America" family. Thank you guys for that. I'm thrilled to be part of the am and glad to be indoors with power at the moment. Thanks again, Kaylee. Kaylee and I used to wo together as well years ago so I can vouch for her. Not sure she can do the same for me though. We won't give her that answer. Kaylee, good to have you on the We want to transition to the

This transcript has been automatically generated and may not be 100% accurate.

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