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From ABC News headquarters in New York City, this is GMA3. Coming up here, we are doing a reality check on carbonated water. Does it help you stay hydrated as well as still water? Well, Dr. Daryan Sutton is going to break down all the questions I have for him. We were just talking about that. Is the Fizzy good or not? I hope it's good because we like to drink. Yeah, we do. There you go. And the new season of Project Runway starts soon. Stars Christian Sieriano and La Roach. They are here to tell us all about it. They are so much fun, so we're excited about that. But first we're going to start here with that tropical threat to the Gulf states, another extreme weather event that could bring flooding to the region.

It follows the catastrophic deadly floods, of course, in Texas and the flooding in the northeast this week. Ginger, you are tracking it all. You were telling us about this yesterday. You knew it was going to develop into something. And the only silver lining I see in all of these catastrophic events is people are paying attention. And so when we say flood watch, I like to really put this out there and let you know where it's coming from. So let's start with what's happening with that low pressure system along the Gulf. It's moving real slowly. It's got displaced moisture way off to the west. So that's by New Orleans, Baton Rouge, and Gulfport are on flood watch. It all really gets going tomorrow through Saturday morning. Doesn't matter if this gets a name or not, which doesn't look likely that it will. It would be called Dexter. We'd be well ahead of schedule for the season if we did get a name. But again, it doesn't matter. It's going to mean a lot of rain. On the order of four to six inches kind of widespread and locally up to 15 inches. And we've seen lately what that can do. The The Gulf Coast handles it better than a lot of regions, but still something to watch as we end the week and go into the weekend. And as you and I have seen, we all have seen it covering storms. It doesn't have to be a super strong storm to do a lot of damage. These floods that are happening, this has happened a lot. Yeah, and it's not just that it seems like that or that you feel like that.

Because of course we see more on social media and people are like laid out like is this real or not.

And the real numbers are in. We do have more flood alerts and flash flood warnings.

This year, more than ever since the 1980s when we began issuing those.

So why?

In the last couple of decades, we have seen huge increases in extreme rainfall events.

The Northeast leads the pack with more than 60% more of those.

And the common question then is, why are we seeing that?

And we know basic physics, you add heat, the moisture in the air can, you can have more. And so it's like a big sponge and we've got a bigger sponge at this point. And so as we warm our climate, we will continue to see more events like that. It also can evaporate and absorb more. So we're going to have longer prolonged drought and you can go from drought to wet more quickly. And it is one thing to notice it, to think it anecdotally, but to have you here with the science to say, yes, we are seeing this more often right now. We just have data. It proves it's right there. Yeah. Thank you, Ginger. We're going to turn now to an arrest in the brutal double murder of an American Idol executive and her husband found shot to death inside their LA mansion.

Trevor Alt is in Los Angeles with more on this really disturbing story, Trevor.

Well, Janay, even with this arrest, this is still very much a mystery here, a double homicide

where police say they don't know the motive. They say the shooter did not know the couple he

allegedly killed. He was inside their house, and we have no idea why. And after an

hours long manhunt and arrest in the violent homicide of an award-winning American Idol producer

and her songwriter husband. The victims were ruthlessly shot multiple times. Robin Kay and

Thomas DeLuca, both 70 years old, found shot to death inside their multi-million dollar home in Los Angeles.

The suspect had managed to scale over one of the fences, gain access to the residents, and

he entered and unlocked or unsecured door of the residents.

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