AccuWeather Lead Hurricane Expert, Alex DaSilva, explains 'homegrown tropical development', when it usually forms, where it usually forms, and how the lead time with these is much shorter than African tropical waves.
00:00Homegrown development occurs right near the United States, whether that be off the southeast coast, in the Gulf, or in the western Caribbean.
00:07That's why we call it homegrown tropical development.
00:10Some hurricanes that strike the U.S. begin thousands of miles away near Africa, crossing the Atlantic before reaching land.
00:16But at certain times in the season, tropical threats can form much closer to home.
00:21We're talking June and July, and at the very end of the tropical season, so think the end of October and into November.
00:27These systems can develop quickly off the U.S. coast.
00:31Homegrown development originates from either an old cold front that's sinking south across the southeastern United States,
00:37and then it might stall off the southeast coast or into the Gulf.
00:40You get a little bit of spin on the end of the cold front, and then you can get tropical development that way.
00:45The western Caribbean is another area to watch when the jet stream dips low.
00:49That helps to induce some spin in the western Caribbean, really helps to get what we call that central American gyre going.
00:55So that's essentially an area of thunderstorms and rotation that occurs over Central America.
01:01Unlike tropical waves from Africa, homegrown systems offer far less lead time.
01:06Tropical waves that originate from Africa typically take about 12 to 14 days to reach the United States.
01:13That's a luxury that we just don't have with this homegrown development, which can take one to four days.
01:20That's why it's important to be prepared and stay alert.
01:23These tropical systems, they have to be watched even more carefully a lot of times because they're so close to the United States and can almost sneak up on people.
01:32So that's why it's so important to look and follow the AccuWeather forecast very, very carefully, especially when it comes to these homegrown development systems.
01:41For AccuWeather, I'm meteorologist Tony Laubach.
01:44For AccuWeather, I'm meteorologist Tony Laubach.
01:53We'll see how it, at this point, on this point, in order to get what it found.
01:57Hello!
01:58I'm meteorologist.
02:01New Speaker's everything voila.
02:01I was meteorologist Tony Laubach.
02:03Valley into downtown Mexico.
02:05I was here at this point where we are King Marlos Daubach.
