AccuWeather's Lead Hurricane Expert Alex DaSilva appeared live on the AccuWeather Network on Sept. 24 to provide the latest updates on two tropical waves in the Atlantic and their potential impact on the United States.

Meteorologists are closely monitoring two tropical waves in the Atlantic, which are currently about 700 miles apart. One system is located on the eastern side of the Atlantic and is expected to gradually intensify, potentially reaching tropical storm status as it moves northwest and then north, possibly passing between the Outer Banks and Bermuda. The other system is in the northeastern Caribbean, bringing heavy rain to Puerto Rico and the U.S. Virgin Islands, with concerns about mudslides in those areas. While this second system is currently disorganized, conditions may become more favorable for development as it moves toward the Turks and Caicos and the Bahamas. Experts note the possibility of the Fujiwara effect, where two nearby storms can interact and influence each other's paths, making the forecast more complex. The ultimate tracks and intensities of both systems remain uncertain and will depend on their interactions in the coming days.

Tracking two Atlantic tropical waves

Joining us right now, AccuWeather lead hurricane expert Alex DaSilva. And Alex, a pretty complicated setup in the Atlantic. Now typically we wouldn't use complicated, but we have two systems within about, what, 700 miles of each other that can both develop and you don't see a setup like this a lot in the Atlantic. Yeah, it's actually more common way out in the western Pacific where you can get two systems that end up really close to one another. And we'll talk about it in a minute, what can happen. It's actually called the Fujiwara effect. If we can get two storms that actually form within close proximity to one another, there's actually an impact on the track that will happen. And again, we'll get to that in a minute, but looking out here, you can see the two areas that we're highlighting. One on the eastern side, that one actually we have a track for right now, dealing with a little dry air right now and some shear. And then the other area is actually in the northeastern Caribbean right now, bringing very, very heavy rain to portions of Puerto Rico, U.S. Virgin Islands. Those areas are going to be dealing with very heavy rain throughout the day today. Well, as I say, let's take them one at a time. Now, this system, a bigger area, I would say it's a little better organized, but it's still disorganized as it's fighting wind shear. Yeah, it's not an ideal environment for intensification, which is certainly good news right now. But I think gradual intensification is likely here over the next couple of days. And we expect it to become a tropical storm maybe as early as this evening or tomorrow as it continues to push to the northwest. Then we're thinking it's going to eventually turn to the north and might pass between the Outer Banks and Bermuda sometime early next week. But again, a lot of this might actually depend on what happens with the other storm we're tracking. Let's remember, we decided to track this tropical wave. We haven't highlighted, there it is across the islands. You know, a lot of sources just said it's no longer viable. We thought that it would. It would take, as you said, a little bit of a hiatus. It would go incognito. But then as it approached the Caribbean, we were worried that conditions would be more favorable. Certainly now, this is very disorganized. Yeah, right now, not really showing a lot right now. But it is bringing very, very heavy rain to portions of Puerto Rico right now. And, you know, anybody out there is going to have to be very careful. We're concerned about some mudslide potentials across that area as well. But overall, not going to develop, I think, over the next day or so. But as it moves into the Turks and Caicos and Bahamas, that wind shear, I think, backs off a little bit. And there's going to be a window in there with those really warm sea surface temperatures and low wind shear that I think we're going to see tropical development. You know, so that would be a couple days from now, likely. But this is the area that we're concerned with for that development in the next few days. Now, as we get into Sunday and then Monday, this will be located. And again, until we get the exact center, there's a lot of debate on exactly where it is. But we do think it'll be off the east coast of Florida. Now, when you look at the weather pattern, I'm going to be talking about this at the feed at 845. You would think that this might get drawn northward into the Carolinas early next week. But our system that we think is going to be a hurricane can kind of change the wind flow. When you have two storms in the same proximity, we have a name for it. Yeah, it's called the Fujiwara effect. And if you have two storms that are within about 870 miles or so, they begin to interact with one another. If one storm is much stronger than the other, more likely it will just draw the other one in. So if that eastern one is much stronger than the one coming into the Bahamas, it'll likely just suck that storm in and absorb it. However, if the storms are within, you know, close intensity of one another, they'll actually start to rotate around each other. So that's the concern is that we could have some tracks here that, you know, it could take some weird turns. And so that one that we're expecting the turnout to see, we have to watch that one as well, because if it starts to interact, maybe it gets a little closer to the United States. So a lot to figure out here over the next couple of days. And a lot of this will be determined on what happens with each of those two storms.

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